bcb6fb78 |
1 | |
e4f2f73d |
2 | /************************************************************************** |
972ef65e |
3 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
4 | * * |
5 | * Author: The ALICE Off-line Project. * |
6 | * Contributors are mentioned in the code where appropriate. * |
7 | * * |
8 | * Permission to use, copy, modify and distribute this software and its * |
9 | * documentation strictly for non-commercial purposes is hereby granted * |
10 | * without fee, provided that the above copyright notice appears in all * |
11 | * copies and that both the copyright notice and this permission notice * |
12 | * appear in the supporting documentation. The authors make no claims * |
13 | * about the suitability of this software for any purpose. It is * |
14 | * provided "as is" without express or implied warranty. * |
15 | **************************************************************************/ |
e4f2f73d |
16 | |
17 | /* $Id$ */ |
18 | |
19 | /////////////////////////////////////////////////////////////////////////////// |
20 | // // |
21 | // Track finder // |
22 | // // |
23 | // Authors: // |
24 | // Alex Bercuci <A.Bercuci@gsi.de> // |
25 | // Markus Fasel <M.Fasel@gsi.de> // |
26 | // // |
27 | /////////////////////////////////////////////////////////////////////////////// |
28 | |
bb56afff |
29 | // #include <Riostream.h> |
30 | // #include <stdio.h> |
31 | // #include <string.h> |
e4f2f73d |
32 | |
33 | #include <TBranch.h> |
bb56afff |
34 | #include <TDirectory.h> |
e4f2f73d |
35 | #include <TLinearFitter.h> |
e4f2f73d |
36 | #include <TTree.h> |
37 | #include <TClonesArray.h> |
e4f2f73d |
38 | #include <TTreeStream.h> |
39 | |
40 | #include "AliLog.h" |
41 | #include "AliESDEvent.h" |
bb56afff |
42 | #include "AliGeomManager.h" |
e4f2f73d |
43 | #include "AliRieman.h" |
44 | #include "AliTrackPointArray.h" |
45 | |
e4f2f73d |
46 | #include "AliTRDgeometry.h" |
47 | #include "AliTRDpadPlane.h" |
e4f2f73d |
48 | #include "AliTRDcalibDB.h" |
e4f2f73d |
49 | #include "AliTRDReconstructor.h" |
50 | #include "AliTRDCalibraFillHisto.h" |
e4f2f73d |
51 | #include "AliTRDrecoParam.h" |
bb56afff |
52 | |
53 | #include "AliTRDcluster.h" |
e4f2f73d |
54 | #include "AliTRDseedV1.h" |
0906e73e |
55 | #include "AliTRDtrackV1.h" |
bb56afff |
56 | #include "AliTRDtrackerV1.h" |
57 | #include "AliTRDtrackerDebug.h" |
58 | #include "AliTRDtrackingChamber.h" |
59 | #include "AliTRDchamberTimeBin.h" |
60 | |
e4f2f73d |
61 | |
e4f2f73d |
62 | |
63 | ClassImp(AliTRDtrackerV1) |
eb38ed55 |
64 | |
65 | |
66 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // |
67 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // |
68 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // |
69 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle |
70 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation |
d76231c8 |
71 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
41702fec |
72 | 0.1112, 0.1112, 0.1112, 0.0786, 0.0786, |
73 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
74 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 |
e4f2f73d |
75 | }; |
2985ffcb |
76 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
eb38ed55 |
77 | TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0; |
78 | AliRieman* AliTRDtrackerV1::fgRieman = 0x0; |
79 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0; |
80 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0; |
e4f2f73d |
81 | |
82 | //____________________________________________________________________ |
3a039a31 |
83 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
41702fec |
84 | :AliTracker() |
06b32d95 |
85 | ,fReconstructor(0x0) |
41702fec |
86 | ,fGeom(new AliTRDgeometry()) |
87 | ,fClusters(0x0) |
88 | ,fTracklets(0x0) |
89 | ,fTracks(0x0) |
90 | ,fSieveSeeding(0) |
e4f2f73d |
91 | { |
41702fec |
92 | // |
93 | // Default constructor. |
94 | // |
a7ac01d2 |
95 | AliTRDcalibDB *trd = 0x0; |
96 | if (!(trd = AliTRDcalibDB::Instance())) { |
41702fec |
97 | AliFatal("Could not get calibration object"); |
98 | } |
a7ac01d2 |
99 | |
100 | if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins(); |
41702fec |
101 | |
053767a4 |
102 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 |
103 | |
d611c74f |
104 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0; |
d20df6fc |
105 | |
3a039a31 |
106 | // Initialize debug stream |
06b32d95 |
107 | if(rec) SetReconstructor(rec); |
eb38ed55 |
108 | } |
109 | |
e4f2f73d |
110 | //____________________________________________________________________ |
111 | AliTRDtrackerV1::~AliTRDtrackerV1() |
112 | { |
41702fec |
113 | // |
114 | // Destructor |
115 | // |
116 | |
117 | if(fgDebugStreamer) delete fgDebugStreamer; |
118 | if(fgRieman) delete fgRieman; |
119 | if(fgTiltedRieman) delete fgTiltedRieman; |
120 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; |
d611c74f |
121 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
41702fec |
122 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
123 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} |
48f8adf3 |
124 | if(fClusters) { |
125 | fClusters->Delete(); delete fClusters; |
126 | } |
41702fec |
127 | if(fGeom) delete fGeom; |
e4f2f73d |
128 | } |
129 | |
130 | //____________________________________________________________________ |
131 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) |
132 | { |
41702fec |
133 | // |
134 | // Steering stand alone tracking for full TRD detector |
135 | // |
136 | // Parameters : |
137 | // esd : The ESD event. On output it contains |
138 | // the ESD tracks found in TRD. |
139 | // |
140 | // Output : |
141 | // Number of tracks found in the TRD detector. |
142 | // |
143 | // Detailed description |
144 | // 1. Launch individual SM trackers. |
145 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. |
146 | // |
147 | |
3a039a31 |
148 | if(!fReconstructor->GetRecoParam() ){ |
149 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); |
41702fec |
150 | return 0; |
151 | } |
152 | |
153 | //AliInfo("Start Track Finder ..."); |
154 | Int_t ntracks = 0; |
053767a4 |
155 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec |
156 | // for(int ism=1; ism<2; ism++){ |
157 | //AliInfo(Form("Processing supermodule %i ...", ism)); |
158 | ntracks += Clusters2TracksSM(ism, esd); |
159 | } |
160 | AliInfo(Form("Number of found tracks : %d", ntracks)); |
161 | return ntracks; |
e4f2f73d |
162 | } |
163 | |
0906e73e |
164 | |
165 | //_____________________________________________________________________________ |
eb38ed55 |
166 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
0906e73e |
167 | { |
41702fec |
168 | //AliInfo(Form("Asking for tracklet %d", index)); |
169 | |
2f7514a6 |
170 | AliTRDseedV1 *tracklet = GetTracklet(index); |
171 | if (!tracklet) return kFALSE; |
41702fec |
172 | |
173 | // get detector for this tracklet |
174 | AliTRDcluster *cl = 0x0; |
175 | Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++))); |
176 | Int_t idet = cl->GetDetector(); |
177 | |
178 | Double_t local[3]; |
179 | local[0] = tracklet->GetX0(); |
180 | local[1] = tracklet->GetYfit(0); |
181 | local[2] = tracklet->GetZfit(0); |
182 | Double_t global[3]; |
183 | fGeom->RotateBack(idet, local, global); |
184 | p.SetXYZ(global[0],global[1],global[2]); |
185 | |
186 | |
187 | // setting volume id |
188 | AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1; |
053767a4 |
189 | switch (fGeom->GetLayer(idet)) { |
41702fec |
190 | case 0: |
191 | iLayer = AliGeomManager::kTRD1; |
192 | break; |
193 | case 1: |
194 | iLayer = AliGeomManager::kTRD2; |
195 | break; |
196 | case 2: |
197 | iLayer = AliGeomManager::kTRD3; |
198 | break; |
199 | case 3: |
200 | iLayer = AliGeomManager::kTRD4; |
201 | break; |
202 | case 4: |
203 | iLayer = AliGeomManager::kTRD5; |
204 | break; |
205 | case 5: |
206 | iLayer = AliGeomManager::kTRD6; |
207 | break; |
208 | }; |
053767a4 |
209 | Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet); |
41702fec |
210 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); |
211 | p.SetVolumeID(volid); |
212 | |
213 | return kTRUE; |
0906e73e |
214 | } |
215 | |
eb38ed55 |
216 | //____________________________________________________________________ |
217 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() |
218 | { |
41702fec |
219 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
220 | return fgTiltedRieman; |
eb38ed55 |
221 | } |
0906e73e |
222 | |
eb38ed55 |
223 | //____________________________________________________________________ |
224 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() |
225 | { |
41702fec |
226 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
227 | return fgTiltedRiemanConstrained; |
eb38ed55 |
228 | } |
41702fec |
229 | |
eb38ed55 |
230 | //____________________________________________________________________ |
231 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() |
232 | { |
053767a4 |
233 | if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer); |
41702fec |
234 | return fgRieman; |
eb38ed55 |
235 | } |
41702fec |
236 | |
0906e73e |
237 | //_____________________________________________________________________________ |
238 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) |
239 | { |
41702fec |
240 | // |
241 | // Gets seeds from ESD event. The seeds are AliTPCtrack's found and |
242 | // backpropagated by the TPC tracker. Each seed is first propagated |
243 | // to the TRD, and then its prolongation is searched in the TRD. |
244 | // If sufficiently long continuation of the track is found in the TRD |
245 | // the track is updated, otherwise it's stored as originaly defined |
246 | // by the TPC tracker. |
247 | // |
248 | |
249 | // Calibration monitor |
250 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
251 | if (!calibra) AliInfo("Could not get Calibra instance\n"); |
252 | |
253 | Int_t found = 0; // number of tracks found |
254 | Float_t foundMin = 20.0; |
255 | |
d611c74f |
256 | Float_t *quality = 0x0; |
257 | Int_t *index = 0x0; |
41702fec |
258 | Int_t nSeed = event->GetNumberOfTracks(); |
d611c74f |
259 | if(nSeed){ |
260 | quality = new Float_t[nSeed]; |
261 | index = new Int_t[nSeed]; |
262 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { |
263 | AliESDtrack *seed = event->GetTrack(iSeed); |
264 | Double_t covariance[15]; |
265 | seed->GetExternalCovariance(covariance); |
266 | quality[iSeed] = covariance[0] + covariance[2]; |
267 | } |
268 | // Sort tracks according to covariance of local Y and Z |
269 | TMath::Sort(nSeed,quality,index,kFALSE); |
41702fec |
270 | } |
41702fec |
271 | |
272 | // Backpropagate all seeds |
273 | Int_t expectedClr; |
274 | AliTRDtrackV1 track; |
275 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { |
276 | |
277 | // Get the seeds in sorted sequence |
278 | AliESDtrack *seed = event->GetTrack(index[iSeed]); |
279 | |
280 | // Check the seed status |
281 | ULong_t status = seed->GetStatus(); |
282 | if ((status & AliESDtrack::kTPCout) == 0) continue; |
283 | if ((status & AliESDtrack::kTRDout) != 0) continue; |
284 | |
285 | // Do the back prolongation |
286 | new(&track) AliTRDtrackV1(*seed); |
287 | //track->Print(); |
288 | //Int_t lbl = seed->GetLabel(); |
289 | //track.SetSeedLabel(lbl); |
e4d4864b |
290 | |
291 | // Make backup and mark entrance in the TRD |
76b60503 |
292 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); |
293 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
41702fec |
294 | Float_t p4 = track.GetC(); |
ae3fbe1f |
295 | expectedClr = FollowBackProlongation(track); |
296 | |
297 | if (expectedClr<0) continue; // Back prolongation failed |
298 | |
299 | if(expectedClr){ |
d611c74f |
300 | found++; |
41702fec |
301 | // computes PID for track |
302 | track.CookPID(); |
303 | // update calibration references using this track |
304 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); |
305 | // save calibration object |
306 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
307 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
308 | |
309 | track.UpdateESDtrack(seed); |
310 | |
311 | // Add TRD track to ESDfriendTrack |
3a039a31 |
312 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){ |
41702fec |
313 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
314 | calibTrack->SetOwner(); |
315 | seed->AddCalibObject(calibTrack); |
316 | } |
317 | } |
318 | } |
319 | |
320 | if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
321 | // |
322 | // Make backup for back propagation |
323 | // |
324 | Int_t foundClr = track.GetNumberOfClusters(); |
325 | if (foundClr >= foundMin) { |
326 | //AliInfo(Form("Making backup track ncls [%d]...", foundClr)); |
327 | //track.CookdEdx(); |
328 | //track.CookdEdxTimBin(seed->GetID()); |
329 | track.CookLabel(1. - fgkLabelFraction); |
330 | if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec |
331 | |
332 | // Sign only gold tracks |
333 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { |
76b60503 |
334 | if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){ |
335 | //UseClusters(&track); |
336 | } |
41702fec |
337 | } |
338 | Bool_t isGold = kFALSE; |
339 | |
340 | // Full gold track |
341 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { |
342 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
343 | |
344 | isGold = kTRUE; |
345 | } |
346 | |
347 | // Almost gold track |
348 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { |
349 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); |
350 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
351 | |
352 | isGold = kTRUE; |
353 | } |
354 | |
355 | if ((!isGold) && (track.GetBackupTrack())) { |
356 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { |
357 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
358 | isGold = kTRUE; |
359 | } |
360 | } |
361 | |
362 | //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) { |
363 | //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup); |
364 | //} |
365 | } |
366 | } |
367 | |
368 | // Propagation to the TOF (I.Belikov) |
369 | if (track.IsStopped() == kFALSE) { |
370 | Double_t xtof = 371.0; |
371 | Double_t xTOF0 = 370.0; |
372 | |
373 | Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX()); |
374 | if (TMath::Abs(c2) >= 0.99) continue; |
375 | |
ae3fbe1f |
376 | if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue; |
41702fec |
377 | |
378 | // Energy losses taken to the account - check one more time |
379 | c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX()); |
380 | if (TMath::Abs(c2) >= 0.99) continue; |
381 | |
382 | //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) { |
383 | // fHBackfit->Fill(7); |
384 | //delete track; |
385 | // continue; |
386 | //} |
387 | |
388 | Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha()); |
389 | Double_t y; |
390 | track.GetYAt(xtof,GetBz(),y); |
391 | if (y > ymax) { |
392 | if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue; |
393 | }else if (y < -ymax) { |
394 | if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue; |
395 | } |
396 | |
397 | if (track.PropagateTo(xtof)) { |
398 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
399 | track.UpdateESDtrack(seed); |
41702fec |
400 | } |
401 | } else { |
402 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
403 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
404 | |
405 | track.UpdateESDtrack(seed); |
41702fec |
406 | } |
407 | } |
408 | |
409 | seed->SetTRDQuality(track.StatusForTOF()); |
410 | seed->SetTRDBudget(track.GetBudget(0)); |
411 | } |
d611c74f |
412 | if(index) delete [] index; |
413 | if(quality) delete [] quality; |
41702fec |
414 | |
415 | |
416 | AliInfo(Form("Number of seeds: %d", nSeed)); |
417 | AliInfo(Form("Number of back propagated TRD tracks: %d", found)); |
418 | |
d611c74f |
419 | // run stand alone tracking |
3a039a31 |
420 | if (fReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec |
421 | |
422 | return 0; |
0906e73e |
423 | } |
424 | |
425 | |
426 | //____________________________________________________________________ |
427 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) |
428 | { |
41702fec |
429 | // |
430 | // Refits tracks within the TRD. The ESD event is expected to contain seeds |
431 | // at the outer part of the TRD. |
432 | // The tracks are propagated to the innermost time bin |
433 | // of the TRD and the ESD event is updated |
434 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) |
435 | // |
436 | |
437 | Int_t nseed = 0; // contor for loaded seeds |
438 | Int_t found = 0; // contor for updated TRD tracks |
439 | |
440 | |
441 | AliTRDtrackV1 track; |
442 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { |
443 | AliESDtrack *seed = event->GetTrack(itrack); |
444 | new(&track) AliTRDtrackV1(*seed); |
445 | |
446 | if (track.GetX() < 270.0) { |
447 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
448 | continue; |
449 | } |
450 | |
451 | ULong_t status = seed->GetStatus(); |
e4d4864b |
452 | // reject tracks which failed propagation in the TRD |
41702fec |
453 | if((status & AliESDtrack::kTRDout) == 0) continue; |
e4d4864b |
454 | |
455 | // reject tracks which are produced by the TRD stand alone track finder. |
456 | if((status & AliESDtrack::kTRDin) == 0) continue; |
41702fec |
457 | nseed++; |
458 | |
459 | track.ResetCovariance(50.0); |
460 | |
461 | // do the propagation and processing |
462 | Bool_t kUPDATE = kFALSE; |
463 | Double_t xTPC = 250.0; |
464 | if(FollowProlongation(track)){ |
465 | // Prolongate to TPC |
466 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update |
467 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
468 | found++; |
469 | kUPDATE = kTRUE; |
470 | } |
471 | } |
472 | |
473 | // Prolongate to TPC without update |
474 | if(!kUPDATE) { |
475 | AliTRDtrackV1 tt(*seed); |
476 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit); |
477 | } |
478 | } |
479 | AliInfo(Form("Number of loaded seeds: %d",nseed)); |
480 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); |
481 | |
482 | return 0; |
0906e73e |
483 | } |
484 | |
0906e73e |
485 | //____________________________________________________________________ |
486 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) |
487 | { |
41702fec |
488 | // Extrapolates the TRD track in the TPC direction. |
489 | // |
490 | // Parameters |
491 | // t : the TRD track which has to be extrapolated |
492 | // |
493 | // Output |
494 | // number of clusters attached to the track |
495 | // |
496 | // Detailed description |
497 | // |
498 | // Starting from current radial position of track <t> this function |
499 | // extrapolates the track through the 6 TRD layers. The following steps |
500 | // are being performed for each plane: |
501 | // 1. prepare track: |
502 | // a. get plane limits in the local x direction |
503 | // b. check crossing sectors |
504 | // c. check track inclination |
505 | // 2. search tracklet in the tracker list (see GetTracklet() for details) |
506 | // 3. evaluate material budget using the geo manager |
507 | // 4. propagate and update track using the tracklet information. |
508 | // |
509 | // Debug level 2 |
510 | // |
511 | |
512 | Int_t nClustersExpected = 0; |
513 | Int_t lastplane = 5; //GetLastPlane(&t); |
514 | for (Int_t iplane = lastplane; iplane >= 0; iplane--) { |
515 | Int_t index = 0; |
516 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
517 | if(!tracklet) continue; |
518 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); |
519 | |
520 | Double_t x = tracklet->GetX0(); |
521 | // reject tracklets which are not considered for inward refit |
522 | if(x > t.GetX()+fgkMaxStep) continue; |
523 | |
524 | // append tracklet to track |
525 | t.SetTracklet(tracklet, index); |
526 | |
527 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; |
528 | if (!AdjustSector(&t)) break; |
529 | |
530 | // Start global position |
531 | Double_t xyz0[3]; |
532 | t.GetXYZ(xyz0); |
533 | |
534 | // End global position |
535 | Double_t alpha = t.GetAlpha(), y, z; |
536 | if (!t.GetProlongation(x,y,z)) break; |
537 | Double_t xyz1[3]; |
538 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
539 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
540 | xyz1[2] = z; |
541 | |
542 | // Get material budget |
543 | Double_t param[7]; |
544 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
545 | Double_t xrho= param[0]*param[4]; |
546 | Double_t xx0 = param[1]; // Get mean propagation parameters |
547 | |
548 | // Propagate and update |
549 | t.PropagateTo(x, xx0, xrho); |
550 | if (!AdjustSector(&t)) break; |
551 | |
552 | Double_t maxChi2 = t.GetPredictedChi2(tracklet); |
553 | if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){ |
554 | nClustersExpected += tracklet->GetN(); |
555 | } |
556 | } |
557 | |
3a039a31 |
558 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
559 | Int_t index; |
560 | for(int iplane=0; iplane<6; iplane++){ |
561 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
562 | if(!tracklet) continue; |
563 | t.SetTracklet(tracklet, index); |
564 | } |
565 | |
566 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
567 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
568 | cstreamer << "FollowProlongation" |
569 | << "EventNumber=" << eventNumber |
570 | << "ncl=" << nClustersExpected |
571 | //<< "track.=" << &t |
572 | << "\n"; |
573 | } |
574 | |
575 | return nClustersExpected; |
0906e73e |
576 | |
577 | } |
578 | |
579 | //_____________________________________________________________________________ |
580 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) |
581 | { |
41702fec |
582 | // Extrapolates the TRD track in the TOF direction. |
583 | // |
584 | // Parameters |
585 | // t : the TRD track which has to be extrapolated |
586 | // |
587 | // Output |
588 | // number of clusters attached to the track |
589 | // |
590 | // Detailed description |
591 | // |
592 | // Starting from current radial position of track <t> this function |
593 | // extrapolates the track through the 6 TRD layers. The following steps |
594 | // are being performed for each plane: |
595 | // 1. prepare track: |
596 | // a. get plane limits in the local x direction |
597 | // b. check crossing sectors |
598 | // c. check track inclination |
599 | // 2. build tracklet (see AliTRDseed::AttachClusters() for details) |
600 | // 3. evaluate material budget using the geo manager |
601 | // 4. propagate and update track using the tracklet information. |
602 | // |
603 | // Debug level 2 |
604 | // |
605 | |
606 | Int_t nClustersExpected = 0; |
607 | Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); |
608 | AliTRDtrackingChamber *chamber = 0x0; |
609 | |
3b57a3f7 |
610 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; |
181d2c97 |
611 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
612 | AliTRDseedV1 *tracklets[kNPlanes]; |
613 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); |
614 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
615 | tracklets[ip] = t.GetTracklet(ip); |
616 | t.UnsetTracklet(ip); |
617 | } |
3b57a3f7 |
618 | |
053767a4 |
619 | // Loop through the TRD layers |
620 | for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) { |
41702fec |
621 | // BUILD TRACKLET IF NOT ALREADY BUILT |
622 | Double_t x = 0., y, z, alpha; |
181d2c97 |
623 | ptrTracklet = tracklets[ilayer]; |
41702fec |
624 | if(!ptrTracklet){ |
053767a4 |
625 | ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer); |
43d6ad34 |
626 | ptrTracklet->SetReconstructor(fReconstructor); |
41702fec |
627 | alpha = t.GetAlpha(); |
053767a4 |
628 | Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector)); |
41702fec |
629 | |
630 | if(!fTrSec[sector].GetNChambers()) continue; |
631 | |
053767a4 |
632 | if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue; |
41702fec |
633 | |
43d6ad34 |
634 | if (!t.GetProlongation(x, y, z)) return -nClustersExpected; |
053767a4 |
635 | Int_t stack = fGeom->GetStack(z, ilayer); |
41702fec |
636 | Int_t nCandidates = stack >= 0 ? 1 : 2; |
637 | z -= stack >= 0 ? 0. : 4.; |
638 | |
639 | for(int icham=0; icham<nCandidates; icham++, z+=8){ |
053767a4 |
640 | if((stack = fGeom->GetStack(z, ilayer)) < 0) continue; |
41702fec |
641 | |
053767a4 |
642 | if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue; |
41702fec |
643 | |
3a039a31 |
644 | if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec |
645 | |
646 | x = chamber->GetX(); |
647 | |
053767a4 |
648 | AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack); |
aec26713 |
649 | tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle())); |
41702fec |
650 | tracklet.SetPadLength(pp->GetLengthIPad()); |
053767a4 |
651 | tracklet.SetPlane(ilayer); |
41702fec |
652 | tracklet.SetX0(x); |
653 | if(!tracklet.Init(&t)){ |
654 | t.SetStopped(kTRUE); |
655 | return nClustersExpected; |
656 | } |
657 | if(!tracklet.AttachClustersIter(chamber, 1000.)) continue; |
658 | tracklet.Init(&t); |
659 | |
3a039a31 |
660 | if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec |
661 | |
662 | break; |
663 | } |
76b60503 |
664 | //ptrTracklet->UseClusters(); |
41702fec |
665 | } |
666 | if(!ptrTracklet->IsOK()){ |
667 | if(x < 1.) continue; //temporary |
43d6ad34 |
668 | if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected; |
669 | if(!AdjustSector(&t)) return -nClustersExpected; |
670 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected; |
41702fec |
671 | continue; |
672 | } |
673 | |
674 | // Propagate closer to the current chamber if neccessary |
675 | x -= clength; |
43d6ad34 |
676 | if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected; |
677 | if (!AdjustSector(&t)) return -nClustersExpected; |
678 | if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected; |
41702fec |
679 | |
680 | // load tracklet to the tracker and the track |
681 | ptrTracklet = SetTracklet(ptrTracklet); |
682 | t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
683 | |
684 | |
685 | // Calculate the mean material budget along the path inside the chamber |
686 | //Calculate global entry and exit positions of the track in chamber (only track prolongation) |
687 | Double_t xyz0[3]; // entry point |
688 | t.GetXYZ(xyz0); |
689 | alpha = t.GetAlpha(); |
690 | x = ptrTracklet->GetX0(); |
43d6ad34 |
691 | if (!t.GetProlongation(x, y, z)) return -nClustersExpected; |
41702fec |
692 | Double_t xyz1[3]; // exit point |
693 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
694 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
695 | xyz1[2] = z; |
696 | Double_t param[7]; |
697 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
698 | // The mean propagation parameters |
699 | Double_t xrho = param[0]*param[4]; // density*length |
700 | Double_t xx0 = param[1]; // radiation length |
701 | |
702 | // Propagate and update track |
43d6ad34 |
703 | if (!t.PropagateTo(x, xx0, xrho)) return -nClustersExpected; |
704 | if (!AdjustSector(&t)) return -nClustersExpected; |
41702fec |
705 | Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet); |
43d6ad34 |
706 | if (!t.Update(ptrTracklet, maxChi2)) return -nClustersExpected; |
ae3fbe1f |
707 | if (maxChi2<1e+10) { |
41702fec |
708 | nClustersExpected += ptrTracklet->GetN(); |
709 | //t.SetTracklet(&tracklet, index); |
710 | } |
711 | // Reset material budget if 2 consecutive gold |
053767a4 |
712 | if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec |
713 | |
714 | // Make backup of the track until is gold |
715 | // TO DO update quality check of the track. |
716 | // consider comparison with fTimeBinsRange |
717 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); |
718 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); |
719 | //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2()); |
720 | //printf("ratio0 %f [> 0.8]\n", ratio0); |
721 | //printf("ratio1 %f [> 0.6]\n", ratio1); |
722 | //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1); |
723 | //printf("t.GetNCross() %d [== 0]\n", t.GetNCross()); |
724 | //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp())); |
725 | //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters()); |
726 | |
727 | if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update |
728 | (ratio0 > 0.8) && |
729 | //(ratio1 > 0.6) && |
730 | //(ratio0+ratio1 > 1.5) && |
731 | (t.GetNCross() == 0) && |
732 | (TMath::Abs(t.GetSnp()) < 0.85) && |
733 | (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack(); |
734 | |
053767a4 |
735 | } // end layers loop |
41702fec |
736 | |
3a039a31 |
737 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
738 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
739 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
740 | //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t); |
741 | //debugTrack->SetOwner(); |
742 | cstreamer << "FollowBackProlongation" |
743 | << "EventNumber=" << eventNumber |
744 | << "ncl=" << nClustersExpected |
745 | //<< "track.=" << debugTrack |
746 | << "\n"; |
747 | } |
748 | |
749 | return nClustersExpected; |
0906e73e |
750 | } |
751 | |
eb38ed55 |
752 | //_________________________________________________________________________ |
753 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){ |
41702fec |
754 | // |
755 | // Fits a Riemann-circle to the given points without tilting pad correction. |
756 | // The fit is performed using an instance of the class AliRieman (equations |
757 | // and transformations see documentation of this class) |
758 | // Afterwards all the tracklets are Updated |
759 | // |
760 | // Parameters: - Array of tracklets (AliTRDseedV1) |
761 | // - Storage for the chi2 values (beginning with direction z) |
762 | // - Seeding configuration |
763 | // Output: - The curvature |
764 | // |
765 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
766 | fitter->Reset(); |
767 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; |
768 | Int_t *ppl = &allplanes[0]; |
769 | Int_t maxLayers = 6; |
770 | if(planes){ |
771 | maxLayers = 4; |
772 | ppl = planes; |
773 | } |
774 | for(Int_t il = 0; il < maxLayers; il++){ |
775 | if(!tracklets[ppl[il]].IsOK()) continue; |
776 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10); |
777 | } |
778 | fitter->Update(); |
779 | // Set the reference position of the fit and calculate the chi2 values |
780 | memset(chi2, 0, sizeof(Double_t) * 2); |
781 | for(Int_t il = 0; il < maxLayers; il++){ |
782 | // Reference positions |
783 | tracklets[ppl[il]].Init(fitter); |
784 | |
785 | // chi2 |
786 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; |
787 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); |
788 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); |
789 | } |
790 | return fitter->GetC(); |
eb38ed55 |
791 | } |
792 | |
793 | //_________________________________________________________________________ |
794 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) |
795 | { |
41702fec |
796 | // |
797 | // Performs a Riemann helix fit using the seedclusters as spacepoints |
798 | // Afterwards the chi2 values are calculated and the seeds are updated |
799 | // |
800 | // Parameters: - The four seedclusters |
801 | // - The tracklet array (AliTRDseedV1) |
802 | // - The seeding configuration |
803 | // - Chi2 array |
804 | // |
805 | // debug level 2 |
806 | // |
807 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
808 | fitter->Reset(); |
809 | for(Int_t i = 0; i < 4; i++) |
810 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10); |
811 | fitter->Update(); |
812 | |
813 | |
814 | // Update the seed and calculated the chi2 value |
815 | chi2[0] = 0; chi2[1] = 0; |
816 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ |
817 | // chi2 |
818 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); |
819 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); |
820 | } |
eb38ed55 |
821 | } |
822 | |
823 | |
824 | //_________________________________________________________________________ |
825 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) |
826 | { |
41702fec |
827 | // |
828 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is |
829 | // assumed that the vertex position is set to 0. |
830 | // This method is very usefull for high-pt particles |
831 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 |
832 | // x0, y0: Center of the circle |
833 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) |
834 | // zc: center of the pad row |
835 | // Equation which has to be fitted (after transformation): |
836 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 |
837 | // Transformation: |
838 | // t = 1/(x^2 + y^2) |
839 | // u = 2 * x * t |
840 | // v = 2 * x * tan(phiT) * t |
841 | // Parameters in the equation: |
842 | // a = -1/y0, b = x0/y0, e = dz/dx |
843 | // |
844 | // The Curvature is calculated by the following equation: |
845 | // - curv = a/Sqrt(b^2 + 1) = 1/R |
846 | // Parameters: - the 6 tracklets |
847 | // - the Vertex constraint |
848 | // Output: - the Chi2 value of the track |
849 | // |
850 | // debug level 5 |
851 | // |
852 | |
853 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); |
854 | fitter->StoreData(kTRUE); |
855 | fitter->ClearPoints(); |
856 | AliTRDcluster *cl = 0x0; |
857 | |
858 | Float_t x, y, z, w, t, error, tilt; |
859 | Double_t uvt[2]; |
860 | Int_t nPoints = 0; |
053767a4 |
861 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
862 | if(!tracklets[ilr].IsOK()) continue; |
41702fec |
863 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
053767a4 |
864 | if(!tracklets[ilr].IsUsable(itb)) continue; |
865 | cl = tracklets[ilr].GetClusters(itb); |
41702fec |
866 | x = cl->GetX(); |
867 | y = cl->GetY(); |
868 | z = cl->GetZ(); |
053767a4 |
869 | tilt = tracklets[ilr].GetTilt(); |
41702fec |
870 | // Transformation |
871 | t = 1./(x * x + y * y); |
872 | uvt[0] = 2. * x * t; |
873 | uvt[1] = 2. * x * t * tilt ; |
874 | w = 2. * (y + tilt * (z - zVertex)) * t; |
875 | error = 2. * 0.2 * t; |
876 | fitter->AddPoint(uvt, w, error); |
877 | nPoints++; |
878 | } |
879 | } |
880 | fitter->Eval(); |
881 | |
882 | // Calculate curvature |
883 | Double_t a = fitter->GetParameter(0); |
884 | Double_t b = fitter->GetParameter(1); |
885 | Double_t curvature = a/TMath::Sqrt(b*b + 1); |
886 | |
887 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
888 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) |
889 | tracklets[ip].SetCC(curvature); |
890 | |
3a039a31 |
891 | /* if(fReconstructor->GetStreamLevel() >= 5){ |
41702fec |
892 | //Linear Model on z-direction |
893 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack |
894 | Double_t slope = fitter->GetParameter(2); |
895 | Double_t zref = slope * xref; |
896 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); |
897 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
898 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
899 | TTreeSRedirector &treeStreamer = *fgDebugStreamer; |
900 | treeStreamer << "FitTiltedRiemanConstraint" |
901 | << "EventNumber=" << eventNumber |
902 | << "CandidateNumber=" << candidateNumber |
903 | << "Curvature=" << curvature |
904 | << "Chi2Track=" << chi2track |
905 | << "Chi2Z=" << chi2Z |
906 | << "zref=" << zref |
907 | << "\n"; |
3a039a31 |
908 | }*/ |
41702fec |
909 | return chi2track; |
eb38ed55 |
910 | } |
911 | |
912 | //_________________________________________________________________________ |
913 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) |
914 | { |
41702fec |
915 | // |
916 | // Performs a Riemann fit taking tilting pad correction into account |
917 | // The equation of a Riemann circle, where the y position is substituted by the |
918 | // measured y-position taking pad tilting into account, has to be transformed |
919 | // into a 4-dimensional hyperplane equation |
920 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 |
921 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) |
922 | // zc: center of the pad row |
923 | // zt: z-position of the track |
924 | // The z-position of the track is assumed to be linear dependent on the x-position |
925 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 |
926 | // Transformation: u = 2 * x * t |
927 | // v = 2 * tan(phiT) * t |
928 | // w = 2 * tan(phiT) * (x - xref) * t |
929 | // t = 1 / (x^2 + ymeas^2) |
930 | // Parameters: a = -1/y0 |
931 | // b = x0/y0 |
932 | // c = (R^2 -x0^2 - y0^2)/y0 |
933 | // d = offset |
934 | // e = dz/dx |
935 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using |
936 | // results from the simple riemann fit. Afterwards the fit is redone. |
937 | // The curvature is calculated according to the formula: |
938 | // curv = a/(1 + b^2 + c*a) = 1/R |
939 | // |
940 | // Paramters: - Array of tracklets (connected to the track candidate) |
941 | // - Flag selecting the error definition |
942 | // Output: - Chi2 values of the track (in Parameter list) |
943 | // |
944 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
945 | fitter->StoreData(kTRUE); |
946 | fitter->ClearPoints(); |
947 | AliTRDLeastSquare zfitter; |
948 | AliTRDcluster *cl = 0x0; |
949 | |
950 | Double_t xref = CalculateReferenceX(tracklets); |
951 | Double_t x, y, z, t, tilt, dx, w, we; |
952 | Double_t uvt[4]; |
953 | Int_t nPoints = 0; |
954 | // Containers for Least-square fitter |
955 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
956 | if(!tracklets[ipl].IsOK()) continue; |
957 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
958 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
959 | if (!tracklets[ipl].IsUsable(itb)) continue; |
960 | x = cl->GetX(); |
961 | y = cl->GetY(); |
962 | z = cl->GetZ(); |
963 | tilt = tracklets[ipl].GetTilt(); |
964 | dx = x - xref; |
965 | // Transformation |
966 | t = 1./(x*x + y*y); |
967 | uvt[0] = 2. * x * t; |
968 | uvt[1] = t; |
969 | uvt[2] = 2. * tilt * t; |
970 | uvt[3] = 2. * tilt * dx * t; |
971 | w = 2. * (y + tilt*z) * t; |
972 | // error definition changes for the different calls |
973 | we = 2. * t; |
974 | we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2; |
975 | fitter->AddPoint(uvt, w, we); |
976 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
977 | nPoints++; |
978 | } |
979 | } |
980 | fitter->Eval(); |
981 | zfitter.Eval(); |
982 | |
983 | Double_t offset = fitter->GetParameter(3); |
984 | Double_t slope = fitter->GetParameter(4); |
985 | |
986 | // Linear fitter - not possible to make boundaries |
987 | // Do not accept non possible z and dzdx combinations |
988 | Bool_t acceptablez = kTRUE; |
989 | Double_t zref = 0.0; |
990 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
991 | if(!tracklets[iLayer].IsOK()) continue; |
992 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); |
993 | if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
994 | acceptablez = kFALSE; |
995 | } |
996 | if (!acceptablez) { |
997 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
998 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
999 | fgTiltedRieman->FixParameter(3, zmf); |
1000 | fgTiltedRieman->FixParameter(4, dzmf); |
1001 | fitter->Eval(); |
1002 | fitter->ReleaseParameter(3); |
1003 | fitter->ReleaseParameter(4); |
1004 | offset = fitter->GetParameter(3); |
1005 | slope = fitter->GetParameter(4); |
1006 | } |
1007 | |
1008 | // Calculate Curvarture |
1009 | Double_t a = fitter->GetParameter(0); |
1010 | Double_t b = fitter->GetParameter(1); |
1011 | Double_t c = fitter->GetParameter(2); |
1012 | Double_t curvature = 1.0 + b*b - c*a; |
1013 | if (curvature > 0.0) |
1014 | curvature = a / TMath::Sqrt(curvature); |
1015 | |
1016 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
1017 | |
1018 | // Update the tracklets |
1019 | Double_t dy, dz; |
1020 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1021 | |
1022 | x = tracklets[iLayer].GetX0(); |
1023 | y = 0; |
1024 | z = 0; |
1025 | dy = 0; |
1026 | dz = 0; |
1027 | |
1028 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1029 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1030 | // R = Sqrt() = 1/Curvature |
1031 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) |
1032 | Double_t res = (x * a + b); // = (x - x0)/y0 |
1033 | res *= res; |
1034 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 |
1035 | if (res >= 0) { |
1036 | res = TMath::Sqrt(res); |
1037 | y = (1.0 - res) / a; |
1038 | } |
1039 | |
1040 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 |
1041 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 |
1042 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1043 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) |
1044 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) |
1045 | Double_t x0 = -b / a; |
1046 | if (-c * a + b * b + 1 > 0) { |
1047 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { |
1048 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1049 | if (a < 0) yderiv *= -1.0; |
1050 | dy = yderiv; |
1051 | } |
1052 | } |
1053 | z = offset + slope * (x - xref); |
1054 | dz = slope; |
1055 | tracklets[iLayer].SetYref(0, y); |
1056 | tracklets[iLayer].SetYref(1, dy); |
1057 | tracklets[iLayer].SetZref(0, z); |
1058 | tracklets[iLayer].SetZref(1, dz); |
1059 | tracklets[iLayer].SetC(curvature); |
1060 | tracklets[iLayer].SetChi2(chi2track); |
1061 | } |
1062 | |
3a039a31 |
1063 | /* if(fReconstructor->GetStreamLevel() >=5){ |
41702fec |
1064 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
1065 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1066 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
1067 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); |
1068 | cstreamer << "FitTiltedRieman0" |
1069 | << "EventNumber=" << eventNumber |
1070 | << "CandidateNumber=" << candidateNumber |
1071 | << "xref=" << xref |
1072 | << "Chi2Z=" << chi2z |
1073 | << "\n"; |
3a039a31 |
1074 | }*/ |
41702fec |
1075 | return chi2track; |
eb38ed55 |
1076 | } |
1077 | |
3b57a3f7 |
1078 | |
9e333711 |
1079 | //____________________________________________________________________ |
1080 | Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
1081 | { |
1082 | AliTRDLeastSquare yfitter, zfitter; |
1083 | AliTRDcluster *cl = 0x0; |
1084 | |
1085 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; |
1086 | if(!tracklets){ |
1087 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1088 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1089 | if(!tracklet->IsOK()) continue; |
1090 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1091 | } |
1092 | tracklets = &work[0]; |
1093 | } |
1094 | |
1095 | Double_t xref = CalculateReferenceX(tracklets); |
1096 | Double_t x, y, z, dx, ye, yr, tilt; |
1097 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1098 | if(!tracklets[ipl].IsOK()) continue; |
1099 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1100 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1101 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1102 | x = cl->GetX(); |
1103 | z = cl->GetZ(); |
1104 | dx = x - xref; |
1105 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1106 | } |
1107 | } |
1108 | zfitter.Eval(); |
1109 | Double_t z0 = zfitter.GetFunctionParameter(0); |
1110 | Double_t dzdx = zfitter.GetFunctionParameter(1); |
1111 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1112 | if(!tracklets[ipl].IsOK()) continue; |
1113 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1114 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1115 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1116 | x = cl->GetX(); |
1117 | y = cl->GetY(); |
1118 | z = cl->GetZ(); |
1119 | tilt = tracklets[ipl].GetTilt(); |
1120 | dx = x - xref; |
1121 | yr = y + tilt*(z - z0 - dzdx*dx); |
1122 | // error definition changes for the different calls |
1123 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); |
1124 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; |
1125 | yfitter.AddPoint(&dx, yr, ye); |
1126 | } |
1127 | } |
1128 | yfitter.Eval(); |
1129 | Double_t y0 = yfitter.GetFunctionParameter(0); |
1130 | Double_t dydx = yfitter.GetFunctionParameter(1); |
1131 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); |
1132 | |
1133 | //update track points array |
1134 | if(np && points){ |
1135 | Float_t xyz[3]; |
1136 | for(int ip=0; ip<np; ip++){ |
1137 | points[ip].GetXYZ(xyz); |
1138 | xyz[1] = y0 + dydx * (xyz[0] - xref); |
1139 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1140 | points[ip].SetXYZ(xyz); |
1141 | } |
1142 | } |
1143 | return chi2; |
1144 | } |
1145 | |
1146 | |
3b57a3f7 |
1147 | //_________________________________________________________________________ |
1148 | Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
1149 | { |
41702fec |
1150 | // |
1151 | // Performs a Riemann fit taking tilting pad correction into account |
1152 | // The equation of a Riemann circle, where the y position is substituted by the |
1153 | // measured y-position taking pad tilting into account, has to be transformed |
1154 | // into a 4-dimensional hyperplane equation |
1155 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 |
1156 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) |
1157 | // zc: center of the pad row |
1158 | // zt: z-position of the track |
1159 | // The z-position of the track is assumed to be linear dependent on the x-position |
1160 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 |
1161 | // Transformation: u = 2 * x * t |
1162 | // v = 2 * tan(phiT) * t |
1163 | // w = 2 * tan(phiT) * (x - xref) * t |
1164 | // t = 1 / (x^2 + ymeas^2) |
1165 | // Parameters: a = -1/y0 |
1166 | // b = x0/y0 |
1167 | // c = (R^2 -x0^2 - y0^2)/y0 |
1168 | // d = offset |
1169 | // e = dz/dx |
1170 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using |
1171 | // results from the simple riemann fit. Afterwards the fit is redone. |
1172 | // The curvature is calculated according to the formula: |
1173 | // curv = a/(1 + b^2 + c*a) = 1/R |
1174 | // |
1175 | // Paramters: - Array of tracklets (connected to the track candidate) |
1176 | // - Flag selecting the error definition |
1177 | // Output: - Chi2 values of the track (in Parameter list) |
1178 | // |
1179 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1180 | fitter->StoreData(kTRUE); |
1181 | fitter->ClearPoints(); |
1182 | AliTRDLeastSquare zfitter; |
1183 | AliTRDcluster *cl = 0x0; |
3b57a3f7 |
1184 | |
1185 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; |
1186 | if(!tracklets){ |
1187 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1188 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1189 | if(!tracklet->IsOK()) continue; |
1190 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1191 | } |
1192 | tracklets = &work[0]; |
1193 | } |
1194 | |
41702fec |
1195 | Double_t xref = CalculateReferenceX(tracklets); |
1196 | Double_t x, y, z, t, tilt, dx, w, we; |
1197 | Double_t uvt[4]; |
1198 | Int_t nPoints = 0; |
1199 | // Containers for Least-square fitter |
1200 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1201 | if(!tracklets[ipl].IsOK()) continue; |
1202 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1203 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1204 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1205 | x = cl->GetX(); |
1206 | y = cl->GetY(); |
1207 | z = cl->GetZ(); |
1208 | tilt = tracklets[ipl].GetTilt(); |
1209 | dx = x - xref; |
1210 | // Transformation |
1211 | t = 1./(x*x + y*y); |
1212 | uvt[0] = 2. * x * t; |
1213 | uvt[1] = t; |
1214 | uvt[2] = 2. * tilt * t; |
1215 | uvt[3] = 2. * tilt * dx * t; |
1216 | w = 2. * (y + tilt*z) * t; |
1217 | // error definition changes for the different calls |
1218 | we = 2. * t; |
1219 | we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2; |
1220 | fitter->AddPoint(uvt, w, we); |
1221 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1222 | nPoints++; |
1223 | } |
1224 | } |
aec26713 |
1225 | if(fitter->Eval()) return 1.E10; |
1226 | |
41702fec |
1227 | Double_t z0 = fitter->GetParameter(3); |
1228 | Double_t dzdx = fitter->GetParameter(4); |
3b57a3f7 |
1229 | |
1230 | |
1231 | // Linear fitter - not possible to make boundaries |
1232 | // Do not accept non possible z and dzdx combinations |
1233 | Bool_t accept = kTRUE; |
1234 | Double_t zref = 0.0; |
1235 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
1236 | if(!tracklets[iLayer].IsOK()) continue; |
1237 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); |
1238 | if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
1239 | accept = kFALSE; |
1240 | } |
1241 | if (!accept) { |
41702fec |
1242 | zfitter.Eval(); |
3b57a3f7 |
1243 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1244 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
1245 | fitter->FixParameter(3, zmf); |
1246 | fitter->FixParameter(4, dzmf); |
1247 | fitter->Eval(); |
1248 | fitter->ReleaseParameter(3); |
1249 | fitter->ReleaseParameter(4); |
1250 | z0 = fitter->GetParameter(3); // = zmf ? |
1251 | dzdx = fitter->GetParameter(4); // = dzmf ? |
1252 | } |
1253 | |
1254 | // Calculate Curvature |
1255 | Double_t a = fitter->GetParameter(0); |
1256 | Double_t b = fitter->GetParameter(1); |
1257 | Double_t c = fitter->GetParameter(2); |
1258 | Double_t y0 = 1. / a; |
1259 | Double_t x0 = -b * y0; |
1260 | Double_t R = TMath::Sqrt(y0*y0 + x0*x0 - c*y0); |
1261 | Double_t C = 1.0 + b*b - c*a; |
1262 | if (C > 0.0) C = a / TMath::Sqrt(C); |
1263 | |
1264 | // Calculate chi2 of the fit |
1265 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); |
1266 | |
1267 | // Update the tracklets |
1268 | if(!track){ |
1269 | for(Int_t ip = 0; ip < kNPlanes; ip++) { |
1270 | x = tracklets[ip].GetX0(); |
1271 | Double_t tmp = TMath::Sqrt(R*R-(x-x0)*(x-x0)); |
1272 | |
1273 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1274 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1275 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); |
1276 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1277 | tracklets[ip].SetYref(1, (x - x0) / tmp); |
1278 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); |
1279 | tracklets[ip].SetZref(1, dzdx); |
1280 | tracklets[ip].SetC(C); |
1281 | tracklets[ip].SetChi2(chi2); |
1282 | } |
1283 | } |
1284 | |
1285 | //update track points array |
1286 | if(np && points){ |
1287 | Float_t xyz[3]; |
1288 | for(int ip=0; ip<np; ip++){ |
1289 | points[ip].GetXYZ(xyz); |
1290 | xyz[1] = y0 - (y0>0.?1.:-1)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0)); |
1291 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1292 | points[ip].SetXYZ(xyz); |
1293 | } |
1294 | } |
1295 | |
3a039a31 |
1296 | /* if(fReconstructor->GetStreamLevel() >=5){ |
3b57a3f7 |
1297 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
1298 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1299 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
1300 | Double_t chi2z = CalculateChi2Z(tracklets, z0, dzdx, xref); |
1301 | cstreamer << "FitRiemanTilt" |
1302 | << "EventNumber=" << eventNumber |
1303 | << "CandidateNumber=" << candidateNumber |
1304 | << "xref=" << xref |
1305 | << "Chi2Z=" << chi2z |
1306 | << "\n"; |
3a039a31 |
1307 | }*/ |
3b57a3f7 |
1308 | return chi2; |
1309 | } |
1310 | |
1311 | |
1bf51039 |
1312 | //____________________________________________________________________ |
1313 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1314 | { |
1315 | // Kalman filter implementation for the TRD. |
1316 | // It returns the positions of the fit in the array "points" |
1317 | // |
1318 | // Author : A.Bercuci@gsi.de |
1319 | |
1320 | //printf("Start track @ x[%f]\n", track->GetX()); |
1321 | |
1322 | //prepare marker points along the track |
1323 | Int_t ip = np ? 0 : 1; |
1324 | while(ip<np){ |
1325 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; |
1326 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); |
1327 | ip++; |
1328 | } |
1329 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); |
1330 | |
1331 | |
1332 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; |
1333 | |
1334 | //Loop through the TRD planes |
1335 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { |
1336 | // GET TRACKLET OR BUILT IT |
1337 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; |
1338 | if(tracklets){ |
1339 | if(!(ptrTracklet = &tracklets[iplane])) continue; |
1340 | }else{ |
1341 | if(!(ptrTracklet = track->GetTracklet(iplane))){ |
1342 | /*AliTRDtrackerV1 *tracker = 0x0; |
1343 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue; |
1344 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); |
1345 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ |
1346 | continue; |
1347 | } |
1348 | } |
1349 | if(!ptrTracklet->IsOK()) continue; |
1350 | |
1351 | Double_t x = ptrTracklet->GetX0(); |
1352 | |
1353 | while(ip < np){ |
1354 | //don't do anything if next marker is after next update point. |
1355 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; |
1356 | |
1357 | //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX()); |
1358 | |
1359 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1360 | |
1361 | Double_t xyz[3]; // should also get the covariance |
1362 | track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1363 | ip++; |
1364 | } |
1365 | //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1366 | |
1367 | //Propagate closer to the next update point |
1368 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1369 | |
1370 | if(!AdjustSector(track)) return -1; |
1371 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; |
1372 | |
1373 | //load tracklet to the tracker and the track |
1374 | /* Int_t index; |
1375 | if((index = FindTracklet(ptrTracklet)) < 0){ |
1376 | ptrTracklet = SetTracklet(&tracklet); |
1377 | index = fTracklets->GetEntriesFast()-1; |
1378 | } |
1379 | track->SetTracklet(ptrTracklet, index);*/ |
1380 | |
1381 | |
1382 | // register tracklet to track with tracklet creation !! |
1383 | // PropagateBack : loaded tracklet to the tracker and update index |
1384 | // RefitInward : update index |
1385 | // MakeTrack : loaded tracklet to the tracker and update index |
1386 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); |
1387 | |
1388 | |
1389 | //Calculate the mean material budget along the path inside the chamber |
1390 | Double_t xyz0[3]; track->GetXYZ(xyz0); |
1391 | Double_t alpha = track->GetAlpha(); |
1392 | Double_t xyz1[3], y, z; |
1393 | if(!track->GetProlongation(x, y, z)) return -1; |
1394 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
1395 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
1396 | xyz1[2] = z; |
1397 | Double_t param[7]; |
1398 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
1399 | Double_t xrho = param[0]*param[4]; // density*length |
1400 | Double_t xx0 = param[1]; // radiation length |
1401 | |
1402 | //Propagate the track |
1403 | track->PropagateTo(x, xx0, xrho); |
1404 | if (!AdjustSector(track)) break; |
1405 | |
1406 | //Update track |
1407 | Double_t chi2 = track->GetPredictedChi2(ptrTracklet); |
1408 | if(chi2<1e+10) track->Update(ptrTracklet, chi2); |
1409 | |
1410 | if(!up) continue; |
1411 | |
1412 | //Reset material budget if 2 consecutive gold |
1413 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); |
1414 | } // end planes loop |
1415 | |
1416 | // extrapolation |
1417 | while(ip < np){ |
1418 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1419 | |
1420 | Double_t xyz[3]; // should also get the covariance |
1421 | track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1422 | ip++; |
1423 | } |
1424 | |
1425 | return track->GetChi2(); |
1426 | } |
3b57a3f7 |
1427 | |
eb38ed55 |
1428 | //_________________________________________________________________________ |
bb56afff |
1429 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 |
1430 | { |
41702fec |
1431 | // |
1432 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. |
1433 | // A linear dependence on the x-value serves as a model. |
1434 | // The parameters are related to the tilted Riemann fit. |
1435 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
1436 | // - the offset for the reference x |
1437 | // - the slope |
1438 | // - the reference x position |
1439 | // Output: - The Chi2 value of the track in z-Direction |
1440 | // |
1441 | Float_t chi2Z = 0, nLayers = 0; |
053767a4 |
1442 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec |
1443 | if(!tracklets[iLayer].IsOK()) continue; |
1444 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); |
1445 | chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z); |
1446 | nLayers++; |
1447 | } |
1448 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); |
1449 | return chi2Z; |
eb38ed55 |
1450 | } |
1451 | |
bccda319 |
1452 | //_____________________________________________________________________________ |
1453 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) |
1454 | { |
41702fec |
1455 | // |
1456 | // Starting from current X-position of track <t> this function |
1457 | // extrapolates the track up to radial position <xToGo>. |
1458 | // Returns 1 if track reaches the plane, and 0 otherwise |
1459 | // |
bccda319 |
1460 | |
41702fec |
1461 | const Double_t kEpsilon = 0.00001; |
bccda319 |
1462 | |
41702fec |
1463 | // Current track X-position |
1464 | Double_t xpos = t.GetX(); |
bccda319 |
1465 | |
41702fec |
1466 | // Direction: inward or outward |
1467 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; |
bccda319 |
1468 | |
41702fec |
1469 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 |
1470 | |
41702fec |
1471 | Double_t xyz0[3]; |
1472 | Double_t xyz1[3]; |
1473 | Double_t param[7]; |
1474 | Double_t x; |
1475 | Double_t y; |
1476 | Double_t z; |
bccda319 |
1477 | |
41702fec |
1478 | // The next step size |
1479 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); |
bccda319 |
1480 | |
41702fec |
1481 | // Get the global position of the starting point |
1482 | t.GetXYZ(xyz0); |
bccda319 |
1483 | |
41702fec |
1484 | // X-position after next step |
1485 | x = xpos + step; |
bccda319 |
1486 | |
41702fec |
1487 | // Get local Y and Z at the X-position of the next step |
1488 | if (!t.GetProlongation(x,y,z)) { |
1489 | return 0; // No prolongation possible |
1490 | } |
bccda319 |
1491 | |
41702fec |
1492 | // The global position of the end point of this prolongation step |
1493 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); |
1494 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); |
1495 | xyz1[2] = z; |
bccda319 |
1496 | |
41702fec |
1497 | // Calculate the mean material budget between start and |
1498 | // end point of this prolongation step |
1499 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
bccda319 |
1500 | |
41702fec |
1501 | // Propagate the track to the X-position after the next step |
1502 | if (!t.PropagateTo(x,param[1],param[0]*param[4])) { |
1503 | return 0; |
1504 | } |
bccda319 |
1505 | |
41702fec |
1506 | // Rotate the track if necessary |
1507 | AdjustSector(&t); |
bccda319 |
1508 | |
41702fec |
1509 | // New track X-position |
1510 | xpos = t.GetX(); |
bccda319 |
1511 | |
41702fec |
1512 | } |
bccda319 |
1513 | |
41702fec |
1514 | return 1; |
bccda319 |
1515 | |
1516 | } |
1517 | |
eb38ed55 |
1518 | |
1519 | //_____________________________________________________________________________ |
1520 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const |
1521 | { |
41702fec |
1522 | // |
1523 | // Reads AliTRDclusters from the file. |
1524 | // The names of the cluster tree and branches |
1525 | // should match the ones used in AliTRDclusterizer::WriteClusters() |
1526 | // |
1527 | |
1528 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); |
1529 | TObjArray *clusterArray = new TObjArray(nsize+1000); |
1530 | |
1531 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); |
1532 | if (!branch) { |
1533 | AliError("Can't get the branch !"); |
1534 | return 1; |
1535 | } |
1536 | branch->SetAddress(&clusterArray); |
1537 | |
1538 | if(!fClusters){ |
1539 | array = new TClonesArray("AliTRDcluster", nsize); |
1540 | array->SetOwner(kTRUE); |
1541 | } |
1542 | |
1543 | // Loop through all entries in the tree |
1544 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); |
1545 | Int_t nbytes = 0; |
1546 | Int_t ncl = 0; |
1547 | AliTRDcluster *c = 0x0; |
1548 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
1549 | // Import the tree |
1550 | nbytes += clusterTree->GetEvent(iEntry); |
1551 | |
1552 | // Get the number of points in the detector |
1553 | Int_t nCluster = clusterArray->GetEntriesFast(); |
1554 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { |
1555 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; |
1556 | c->SetInChamber(); |
1557 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
1558 | delete (clusterArray->RemoveAt(iCluster)); |
1559 | } |
1560 | |
1561 | } |
1562 | delete clusterArray; |
1563 | |
1564 | return 0; |
eb38ed55 |
1565 | } |
1566 | |
1567 | //_____________________________________________________________________________ |
1568 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) |
1569 | { |
41702fec |
1570 | // |
66f6bfd9 |
1571 | // Fills clusters into TRD tracking sectors |
41702fec |
1572 | // |
41702fec |
1573 | |
48f8adf3 |
1574 | if(!fReconstructor->IsWritingClusters()){ |
1575 | fClusters = AliTRDReconstructor::GetClusters(); |
1576 | } else { |
66f6bfd9 |
1577 | if (ReadClusters(fClusters, cTree)) { |
1578 | AliError("Problem with reading the clusters !"); |
1579 | return 1; |
1580 | } |
1581 | } |
1582 | SetClustersOwner(); |
1583 | |
48f8adf3 |
1584 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 |
1585 | AliInfo("No TRD clusters"); |
41702fec |
1586 | return 1; |
1587 | } |
66f6bfd9 |
1588 | |
1589 | //Int_t nin = |
1590 | BuildTrackingContainers(); |
1591 | |
1592 | //Int_t ncl = fClusters->GetEntriesFast(); |
1593 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1594 | |
1595 | return 0; |
1596 | } |
1597 | |
1598 | //_____________________________________________________________________________ |
1599 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters) |
1600 | { |
1601 | // |
1602 | // Fills clusters into TRD tracking sectors |
1603 | // Function for use in the HLT |
1604 | |
1605 | if(!clusters || !clusters->GetEntriesFast()){ |
1606 | AliInfo("No TRD clusters"); |
41702fec |
1607 | return 1; |
1608 | } |
1609 | |
66f6bfd9 |
1610 | fClusters = clusters; |
1611 | SetClustersOwner(); |
1612 | |
1613 | //Int_t nin = |
1614 | BuildTrackingContainers(); |
1615 | |
1616 | //Int_t ncl = fClusters->GetEntriesFast(); |
1617 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1618 | |
1619 | return 0; |
1620 | } |
1621 | |
1622 | |
1623 | //____________________________________________________________________ |
1624 | Int_t AliTRDtrackerV1::BuildTrackingContainers() |
1625 | { |
1626 | // Building tracking containers for clusters |
1627 | |
1628 | Int_t nin =0, icl = fClusters->GetEntriesFast(); |
41702fec |
1629 | while (icl--) { |
1630 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); |
1631 | if(c->IsInChamber()) nin++; |
1632 | Int_t detector = c->GetDetector(); |
1633 | Int_t sector = fGeom->GetSector(detector); |
053767a4 |
1634 | Int_t stack = fGeom->GetStack(detector); |
1635 | Int_t layer = fGeom->GetLayer(detector); |
41702fec |
1636 | |
053767a4 |
1637 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec |
1638 | } |
41702fec |
1639 | |
053767a4 |
1640 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec |
1641 | if(!fTrSec[isector].GetNChambers()) continue; |
3a039a31 |
1642 | fTrSec[isector].Init(fReconstructor); |
41702fec |
1643 | } |
66f6bfd9 |
1644 | |
1645 | return nin; |
eb38ed55 |
1646 | } |
1647 | |
1648 | |
66f6bfd9 |
1649 | |
0906e73e |
1650 | //____________________________________________________________________ |
1651 | void AliTRDtrackerV1::UnloadClusters() |
1652 | { |
41702fec |
1653 | // |
1654 | // Clears the arrays of clusters and tracks. Resets sectors and timebins |
1655 | // |
0906e73e |
1656 | |
41702fec |
1657 | if(fTracks) fTracks->Delete(); |
1658 | if(fTracklets) fTracklets->Delete(); |
66f6bfd9 |
1659 | if(fClusters && IsClustersOwner()) fClusters->Delete(); |
48f8adf3 |
1660 | if(fClusters){ |
1661 | if(IsClustersOwner()) fClusters->Delete(); |
1662 | |
1663 | // save clusters array in the reconstructor for further use. |
1664 | if(!fReconstructor->IsWritingClusters()){ |
1665 | AliTRDReconstructor::SetClusters(fClusters); |
1666 | SetClustersOwner(kFALSE); |
1667 | } else AliTRDReconstructor::SetClusters(0x0); |
1668 | } |
0906e73e |
1669 | |
053767a4 |
1670 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e |
1671 | |
41702fec |
1672 | // Increment the Event Number |
1673 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); |
eb38ed55 |
1674 | } |
0906e73e |
1675 | |
eb38ed55 |
1676 | //_____________________________________________________________________________ |
1677 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track) |
1678 | { |
41702fec |
1679 | // |
1680 | // Rotates the track when necessary |
1681 | // |
1682 | |
1683 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
1684 | Double_t y = track->GetY(); |
1685 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); |
1686 | |
1687 | if (y > ymax) { |
1688 | if (!track->Rotate( alpha)) { |
1689 | return kFALSE; |
1690 | } |
1691 | } |
1692 | else if (y < -ymax) { |
1693 | if (!track->Rotate(-alpha)) { |
1694 | return kFALSE; |
1695 | } |
1696 | } |
1697 | |
1698 | return kTRUE; |
0906e73e |
1699 | |
1700 | } |
1701 | |
eb38ed55 |
1702 | |
0906e73e |
1703 | //____________________________________________________________________ |
1704 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx) |
1705 | { |
41702fec |
1706 | // Find tracklet for TRD track <track> |
1707 | // Parameters |
1708 | // - track |
1709 | // - sector |
1710 | // - plane |
1711 | // - index |
1712 | // Output |
1713 | // tracklet |
1714 | // index |
1715 | // Detailed description |
1716 | // |
1717 | idx = track->GetTrackletIndex(p); |
1718 | AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
1719 | |
1720 | return tracklet; |
0906e73e |
1721 | } |
1722 | |
1723 | //____________________________________________________________________ |
3b57a3f7 |
1724 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet) |
0906e73e |
1725 | { |
41702fec |
1726 | // Add this tracklet to the list of tracklets stored in the tracker |
1727 | // |
1728 | // Parameters |
1729 | // - tracklet : pointer to the tracklet to be added to the list |
1730 | // |
1731 | // Output |
1732 | // - the index of the new tracklet in the tracker tracklets list |
1733 | // |
1734 | // Detailed description |
1735 | // Build the tracklets list if it is not yet created (late initialization) |
1736 | // and adds the new tracklet to the list. |
1737 | // |
1738 | if(!fTracklets){ |
053767a4 |
1739 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec |
1740 | fTracklets->SetOwner(kTRUE); |
1741 | } |
1742 | Int_t nentries = fTracklets->GetEntriesFast(); |
1743 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); |
972ef65e |
1744 | } |
1745 | |
d20df6fc |
1746 | //____________________________________________________________________ |
1747 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track) |
1748 | { |
1749 | // Add this track to the list of tracks stored in the tracker |
1750 | // |
1751 | // Parameters |
1752 | // - track : pointer to the track to be added to the list |
1753 | // |
1754 | // Output |
1755 | // - the pointer added |
1756 | // |
1757 | // Detailed description |
1758 | // Build the tracks list if it is not yet created (late initialization) |
1759 | // and adds the new track to the list. |
1760 | // |
1761 | if(!fTracks){ |
053767a4 |
1762 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc |
1763 | fTracks->SetOwner(kTRUE); |
1764 | } |
1765 | Int_t nentries = fTracks->GetEntriesFast(); |
1766 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); |
1767 | } |
1768 | |
1769 | |
0906e73e |
1770 | |
e4f2f73d |
1771 | //____________________________________________________________________ |
eb38ed55 |
1772 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d |
1773 | { |
41702fec |
1774 | // |
1775 | // Steer tracking for one SM. |
1776 | // |
1777 | // Parameters : |
1778 | // sector : Array of (SM) propagation layers containing clusters |
1779 | // esd : The current ESD event. On output it contains the also |
1780 | // the ESD (TRD) tracks found in this SM. |
1781 | // |
1782 | // Output : |
1783 | // Number of tracks found in this TRD supermodule. |
1784 | // |
1785 | // Detailed description |
1786 | // |
1787 | // 1. Unpack AliTRDpropagationLayers objects for each stack. |
1788 | // 2. Launch stack tracking. |
1789 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. |
1790 | // 3. Pack results in the ESD event. |
1791 | // |
1792 | |
1793 | // allocate space for esd tracks in this SM |
1794 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); |
1795 | esdTrackList.SetOwner(); |
1796 | |
1797 | Int_t nTracks = 0; |
1798 | Int_t nChambers = 0; |
1799 | AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0; |
053767a4 |
1800 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec |
1801 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
1802 | nChambers = 0; |
053767a4 |
1803 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
1804 | if(!(chamber = stack[ilayer])) continue; |
3a039a31 |
1805 | if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec |
1806 | nChambers++; |
053767a4 |
1807 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec |
1808 | } |
1809 | if(nChambers < 4) continue; |
1810 | //AliInfo(Form("Doing stack %d", istack)); |
1811 | nTracks += Clusters2TracksStack(stack, &esdTrackList); |
1812 | } |
1813 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); |
1814 | |
1815 | for(int itrack=0; itrack<nTracks; itrack++) |
1816 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); |
1817 | |
1818 | // Reset Track and Candidate Number |
1819 | AliTRDtrackerDebug::SetCandidateNumber(0); |
1820 | AliTRDtrackerDebug::SetTrackNumber(0); |
1821 | return nTracks; |
e4f2f73d |
1822 | } |
1823 | |
1824 | //____________________________________________________________________ |
eb38ed55 |
1825 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList) |
e4f2f73d |
1826 | { |
41702fec |
1827 | // |
1828 | // Make tracks in one TRD stack. |
1829 | // |
1830 | // Parameters : |
1831 | // layer : Array of stack propagation layers containing clusters |
1832 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. |
1833 | // On exit the tracks found in this stack are appended. |
1834 | // |
1835 | // Output : |
1836 | // Number of tracks found in this stack. |
1837 | // |
1838 | // Detailed description |
1839 | // |
1840 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. |
1841 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. |
1842 | // See AliTRDtrackerV1::MakeSeeds() for more details. |
1843 | // 3. Arrange track candidates in decreasing order of their quality |
1844 | // 4. Classify tracks in 5 categories according to: |
1845 | // a) number of layers crossed |
1846 | // b) track quality |
1847 | // 5. Sign clusters by tracks in decreasing order of track quality |
1848 | // 6. Build AliTRDtrack out of seeding tracklets |
1849 | // 7. Cook MC label |
1850 | // 8. Build ESD track and register it to the output list |
1851 | // |
1852 | |
1853 | AliTRDtrackingChamber *chamber = 0x0; |
1854 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
1855 | Int_t pars[4]; // MakeSeeds parameters |
1856 | |
1857 | //Double_t alpha = AliTRDgeometry::GetAlpha(); |
1858 | //Double_t shift = .5 * alpha; |
1859 | Int_t configs[kNConfigs]; |
1860 | |
1861 | // Build initial seeding configurations |
1862 | Double_t quality = BuildSeedingConfigs(stack, configs); |
3a039a31 |
1863 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
1864 | AliInfo(Form("Plane config %d %d %d Quality %f" |
1865 | , configs[0], configs[1], configs[2], quality)); |
1866 | } |
1867 | |
1868 | // Initialize contors |
1869 | Int_t ntracks, // number of TRD track candidates |
1870 | ntracks1, // number of registered TRD tracks/iter |
1871 | ntracks2 = 0; // number of all registered TRD tracks in stack |
1872 | fSieveSeeding = 0; |
1873 | do{ |
1874 | // Loop over seeding configurations |
1875 | ntracks = 0; ntracks1 = 0; |
1876 | for (Int_t iconf = 0; iconf<3; iconf++) { |
1877 | pars[0] = configs[iconf]; |
1878 | pars[1] = ntracks; |
1879 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
1880 | if(ntracks == kMaxTracksStack) break; |
1881 | } |
3a039a31 |
1882 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec |
1883 | |
1884 | if(!ntracks) break; |
1885 | |
1886 | // Sort the seeds according to their quality |
1887 | Int_t sort[kMaxTracksStack]; |
1888 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); |
1889 | |
1890 | // Initialize number of tracks so far and logic switches |
1891 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); |
1892 | Bool_t signedTrack[kMaxTracksStack]; |
1893 | Bool_t fakeTrack[kMaxTracksStack]; |
1894 | for (Int_t i=0; i<ntracks; i++){ |
1895 | signedTrack[i] = kFALSE; |
1896 | fakeTrack[i] = kFALSE; |
1897 | } |
1898 | //AliInfo("Selecting track candidates ..."); |
1899 | |
1900 | // Sieve clusters in decreasing order of track quality |
1901 | Double_t trackParams[7]; |
1902 | // AliTRDseedV1 *lseed = 0x0; |
1903 | Int_t jSieve = 0, candidates; |
1904 | do{ |
1905 | //AliInfo(Form("\t\tITER = %i ", jSieve)); |
1906 | |
1907 | // Check track candidates |
1908 | candidates = 0; |
1909 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { |
804bb02e |
1910 | Int_t trackIndex = sort[itrack]; |
1911 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; |
41702fec |
1912 | |
1913 | |
804bb02e |
1914 | // Calculate track parameters from tracklets seeds |
804bb02e |
1915 | Int_t ncl = 0; |
1916 | Int_t nused = 0; |
1917 | Int_t nlayers = 0; |
1918 | Int_t findable = 0; |
1919 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { |
1920 | Int_t jseed = kNPlanes*trackIndex+jLayer; |
1921 | if(!sseed[jseed].IsOK()) continue; |
1922 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++; |
1923 | |
1924 | sseed[jseed].UpdateUsed(); |
1925 | ncl += sseed[jseed].GetN2(); |
1926 | nused += sseed[jseed].GetNUsed(); |
1927 | nlayers++; |
804bb02e |
1928 | } |
1929 | |
41702fec |
1930 | // Filter duplicated tracks |
1931 | if (nused > 30){ |
1932 | //printf("Skip %d nused %d\n", trackIndex, nused); |
1933 | fakeTrack[trackIndex] = kTRUE; |
1934 | continue; |
1935 | } |
1936 | if (Float_t(nused)/ncl >= .25){ |
1937 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); |
1938 | fakeTrack[trackIndex] = kTRUE; |
1939 | continue; |
1940 | } |
1941 | |
1942 | // Classify tracks |
1943 | Bool_t skip = kFALSE; |
1944 | switch(jSieve){ |
1945 | case 0: |
1946 | if(nlayers < 6) {skip = kTRUE; break;} |
1947 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
1948 | break; |
1949 | |
1950 | case 1: |
1951 | if(nlayers < findable){skip = kTRUE; break;} |
1952 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} |
1953 | break; |
1954 | |
1955 | case 2: |
1956 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} |
1957 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} |
1958 | break; |
1959 | |
1960 | case 3: |
1961 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
1962 | break; |
1963 | |
1964 | case 4: |
1965 | if (nlayers == 3){skip = kTRUE; break;} |
1966 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} |
1967 | break; |
1968 | } |
1969 | if(skip){ |
1970 | candidates++; |
1971 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); |
1972 | continue; |
1973 | } |
1974 | signedTrack[trackIndex] = kTRUE; |
1975 | |
41702fec |
1976 | |
1977 | // Sign clusters |
1978 | AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1; |
be24510a |
1979 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { |
41702fec |
1980 | Int_t jseed = kNPlanes*trackIndex+jLayer; |
1981 | if(!sseed[jseed].IsOK()) continue; |
1982 | if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian |
1983 | sseed[jseed].UseClusters(); |
1984 | if(!cl){ |
1985 | Int_t ic = 0; |
1986 | while(!(cl = sseed[jseed].GetClusters(ic))) ic++; |
1987 | clusterIndex = sseed[jseed].GetIndexes(ic); |
1988 | } |
1989 | } |
1990 | if(!cl) continue; |
1991 | |
1992 | |
1993 | // Build track parameters |
1994 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; |
e79f8eb0 |
1995 | /* Int_t idx = 0; |
41702fec |
1996 | while(idx<3 && !lseed->IsOK()) { |
1997 | idx++; |
1998 | lseed++; |
e79f8eb0 |
1999 | }*/ |
e79f8eb0 |
2000 | Double_t x = lseed->GetX0();// - 3.5; |
41702fec |
2001 | trackParams[0] = x; //NEW AB |
e79f8eb0 |
2002 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); |
2003 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); |
2004 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); |
41702fec |
2005 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); |
be24510a |
2006 | trackParams[5] = lseed->GetC(); |
41702fec |
2007 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; |
2008 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ |
2009 | |
3a039a31 |
2010 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
2011 | AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
2012 | |
2013 | Int_t nclusters = 0; |
2014 | AliTRDseedV1 *dseed[6]; |
804bb02e |
2015 | |
2016 | // Build track label - what happens if measured data ??? |
2017 | Int_t labels[1000]; |
2018 | Int_t outlab[1000]; |
2019 | Int_t nlab = 0; |
d877f55f |
2020 | |
2021 | Int_t labelsall[1000]; |
2022 | Int_t nlabelsall = 0; |
2023 | Int_t naccepted = 0; |
2024 | |
804bb02e |
2025 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
2026 | Int_t jseed = kNPlanes*trackIndex+iLayer; |
2027 | dseed[iLayer] = new AliTRDseedV1(sseed[jseed]); |
2028 | dseed[iLayer]->SetOwner(); |
2029 | nclusters += sseed[jseed].GetN2(); |
2030 | if(!sseed[jseed].IsOK()) continue; |
2031 | for(int ilab=0; ilab<2; ilab++){ |
2032 | if(sseed[jseed].GetLabels(ilab) < 0) continue; |
2033 | labels[nlab] = sseed[jseed].GetLabels(ilab); |
2034 | nlab++; |
2035 | } |
d877f55f |
2036 | |
2037 | // Cooking label |
2038 | for (Int_t itime = 0; itime < fgNTimeBins; itime++) { |
2039 | if(!sseed[jseed].IsUsable(itime)) continue; |
2040 | naccepted++; |
2041 | Int_t tindex = 0, ilab = 0; |
2042 | while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){ |
2043 | labelsall[nlabelsall++] = tindex; |
2044 | ilab++; |
2045 | } |
2046 | } |
41702fec |
2047 | } |
804bb02e |
2048 | Freq(nlab,labels,outlab,kFALSE); |
2049 | Int_t label = outlab[0]; |
2050 | Int_t frequency = outlab[1]; |
2051 | Freq(nlabelsall,labelsall,outlab,kFALSE); |
2052 | Int_t label1 = outlab[0]; |
2053 | Int_t label2 = outlab[2]; |
2054 | Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted); |
2055 | |
41702fec |
2056 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); |
2057 | //AliInfo(Form("Number of clusters %d.", nclusters)); |
2058 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2059 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); |
2060 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2061 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2062 | cstreamer << "Clusters2TracksStack" |
2063 | << "EventNumber=" << eventNumber |
2064 | << "TrackNumber=" << trackNumber |
2065 | << "CandidateNumber=" << candidateNumber |
2066 | << "Iter=" << fSieveSeeding |
2067 | << "Like=" << fTrackQuality[trackIndex] |
2068 | << "S0.=" << dseed[0] |
2069 | << "S1.=" << dseed[1] |
2070 | << "S2.=" << dseed[2] |
2071 | << "S3.=" << dseed[3] |
2072 | << "S4.=" << dseed[4] |
2073 | << "S5.=" << dseed[5] |
2074 | << "p0=" << trackParams[0] |
2075 | << "p1=" << trackParams[1] |
2076 | << "p2=" << trackParams[2] |
2077 | << "p3=" << trackParams[3] |
2078 | << "p4=" << trackParams[4] |
2079 | << "p5=" << trackParams[5] |
2080 | << "p6=" << trackParams[6] |
2081 | << "Label=" << label |
2082 | << "Label1=" << label1 |
2083 | << "Label2=" << label2 |
2084 | << "FakeRatio=" << fakeratio |
2085 | << "Freq=" << frequency |
2086 | << "Ncl=" << ncl |
2087 | << "NLayers=" << nlayers |
2088 | << "Findable=" << findable |
41702fec |
2089 | << "NUsed=" << nused |
2090 | << "\n"; |
2091 | } |
2092 | |
2093 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2094 | if(!track){ |
2095 | AliWarning("Fail to build a TRD Track."); |
2096 | continue; |
2097 | } |
76b60503 |
2098 | |
41702fec |
2099 | //AliInfo("End of MakeTrack()"); |
098c3c3d |
2100 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); |
2101 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); |
2102 | esdTrack->SetLabel(track->GetLabel()); |
2103 | track->UpdateESDtrack(esdTrack); |
41702fec |
2104 | // write ESD-friends if neccessary |
3a039a31 |
2105 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
41702fec |
2106 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2107 | calibTrack->SetOwner(); |
098c3c3d |
2108 | esdTrack->AddCalibObject(calibTrack); |
41702fec |
2109 | } |
41702fec |
2110 | ntracks1++; |
2111 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); |
2112 | } |
2113 | |
2114 | jSieve++; |
2115 | } while(jSieve<5 && candidates); // end track candidates sieve |
2116 | if(!ntracks1) break; |
2117 | |
2118 | // increment counters |
2119 | ntracks2 += ntracks1; |
4302c900 |
2120 | |
2121 | if(fReconstructor->IsHLT()) break; |
41702fec |
2122 | fSieveSeeding++; |
2123 | |
2124 | // Rebuild plane configurations and indices taking only unused clusters into account |
2125 | quality = BuildSeedingConfigs(stack, configs); |
3a039a31 |
2126 | if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec |
2127 | |
2128 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
2129 | if(!(chamber = stack[ip])) continue; |
2130 | chamber->Build(fGeom);//Indices(fSieveSeeding); |
2131 | } |
2132 | |
3a039a31 |
2133 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
2134 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2135 | } |
2136 | } while(fSieveSeeding<10); // end stack clusters sieve |
2137 | |
2138 | |
2139 | |
2140 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); |
2141 | |
2142 | return ntracks2; |
e4f2f73d |
2143 | } |
2144 | |
2145 | //___________________________________________________________________ |
eb38ed55 |
2146 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d |
2147 | { |
41702fec |
2148 | // |
2149 | // Assign probabilities to chambers according to their |
2150 | // capability of producing seeds. |
2151 | // |
2152 | // Parameters : |
2153 | // |
2154 | // layers : Array of stack propagation layers for all 6 chambers in one stack |
2155 | // configs : On exit array of configuration indexes (see GetSeedingConfig() |
2156 | // for details) in the decreasing order of their seeding probabilities. |
2157 | // |
2158 | // Output : |
2159 | // |
2160 | // Return top configuration quality |
2161 | // |
2162 | // Detailed description: |
2163 | // |
2164 | // To each chamber seeding configuration (see GetSeedingConfig() for |
2165 | // the list of all configurations) one defines 2 quality factors: |
2166 | // - an apriori topological quality (see GetSeedingConfig() for details) and |
2167 | // - a data quality based on the uniformity of the distribution of |
2168 | // clusters over the x range (time bins population). See CookChamberQA() for details. |
2169 | // The overall chamber quality is given by the product of this 2 contributions. |
2170 | // |
2171 | |
2172 | Double_t chamberQ[kNPlanes]; |
2173 | AliTRDtrackingChamber *chamber = 0x0; |
2174 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2175 | if(!(chamber = stack[iplane])) continue; |
2176 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; |
2177 | } |
2178 | |
2179 | Double_t tconfig[kNConfigs]; |
2180 | Int_t planes[4]; |
2181 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2182 | GetSeedingConfig(iconf, planes); |
2183 | tconfig[iconf] = fgTopologicQA[iconf]; |
2184 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; |
2185 | } |
2186 | |
2187 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); |
2188 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); |
2189 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); |
2190 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); |
2191 | |
2192 | return tconfig[configs[0]]; |
e4f2f73d |
2193 | } |
2194 | |
2195 | //____________________________________________________________________ |
eb38ed55 |
2196 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar) |
e4f2f73d |
2197 | { |
41702fec |
2198 | // |
2199 | // Make tracklet seeds in the TRD stack. |
2200 | // |
2201 | // Parameters : |
2202 | // layers : Array of stack propagation layers containing clusters |
2203 | // sseed : Array of empty tracklet seeds. On exit they are filled. |
2204 | // ipar : Control parameters: |
2205 | // ipar[0] -> seeding chambers configuration |
2206 | // ipar[1] -> stack index |
2207 | // ipar[2] -> number of track candidates found so far |
2208 | // |
2209 | // Output : |
2210 | // Number of tracks candidates found. |
2211 | // |
2212 | // Detailed description |
2213 | // |
2214 | // The following steps are performed: |
2215 | // 1. Select seeding layers from seeding chambers |
2216 | // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack. |
2217 | // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in |
2218 | // this order. The parameters controling the range of accepted clusters in |
2219 | // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond(). |
2220 | // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)) |
2221 | // 4. Initialize seeding tracklets in the seeding chambers. |
2222 | // 5. Filter 0. |
2223 | // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer)) |
2224 | // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer)) |
2225 | // 6. Attach clusters to seeding tracklets and find linear approximation of |
2226 | // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used |
2227 | // clusters used by current seeds should not exceed ... (25). |
2228 | // 7. Filter 1. |
2229 | // All 4 seeding tracklets should be correctly constructed (see |
2230 | // AliTRDseedV1::AttachClustersIter()) |
2231 | // 8. Helix fit of the seeding tracklets |
2232 | // 9. Filter 2. |
2233 | // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details) |
2234 | // 10. Extrapolation of the helix fit to the other 2 chambers: |
2235 | // a) Initialization of extrapolation tracklet with fit parameters |
2236 | // b) Helix fit of tracklets |
2237 | // c) Attach clusters and linear interpolation to extrapolated tracklets |
2238 | // d) Helix fit of tracklets |
2239 | // 11. Improve seeding tracklets quality by reassigning clusters. |
2240 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. |
2241 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation |
2242 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. |
2243 | // 14. Cooking labels for tracklets. Should be done only for MC |
2244 | // 15. Register seeds. |
2245 | // |
2246 | |
2247 | AliTRDtrackingChamber *chamber = 0x0; |
be24510a |
2248 | AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters |
41702fec |
2249 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
2250 | Int_t ncl, mcl; // working variable for looping over clusters |
2251 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; |
2252 | // chi2 storage |
2253 | // chi2[0] = tracklet chi2 on the Z direction |
2254 | // chi2[1] = tracklet chi2 on the R direction |
2255 | Double_t chi2[4]; |
2256 | |
e79f8eb0 |
2257 | // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters |
2258 | // Positions taken using cosmic data taken with SM3 after rebuild |
2259 | Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338, 350.6, 363.2}; |
41702fec |
2260 | |
2261 | // this should be data member of AliTRDtrack |
2262 | Double_t seedQuality[kMaxTracksStack]; |
2263 | |
2264 | // unpack control parameters |
2265 | Int_t config = ipar[0]; |
2266 | Int_t ntracks = ipar[1]; |
2267 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
be24510a |
2268 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
2269 | |
2270 | |
41702fec |
2271 | // Init chambers geometry |
2272 | Int_t ic = 0; while(!(chamber = stack[ic])) ic++; |
053767a4 |
2273 | Int_t istack = fGeom->GetStack(chamber->GetDetector()); |
41702fec |
2274 | Double_t hL[kNPlanes]; // Tilting angle |
2275 | Float_t padlength[kNPlanes]; // pad lenghts |
2276 | AliTRDpadPlane *pp = 0x0; |
2277 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2278 | pp = fGeom->GetPadPlane(iplane, istack); |
bb79ccd5 |
2279 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec |
2280 | padlength[iplane] = pp->GetLengthIPad(); |
2281 | } |
2282 | |
3a039a31 |
2283 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
2284 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
2285 | } |
2286 | |
d611c74f |
2287 | ResetSeedTB(); |
41702fec |
2288 | Int_t nlayers = 0; |
41702fec |
2289 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2290 | if(!(chamber = stack[planes[isl]])) continue; |
3a039a31 |
2291 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue; |
41702fec |
2292 | nlayers++; |
41702fec |
2293 | } |
2294 | if(nlayers < 4) return 0; |
2295 | |
2296 | |
2297 | // Start finding seeds |
2298 | Double_t cond0[4], cond1[4], cond2[4]; |
2299 | Int_t icl = 0; |
d611c74f |
2300 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec |
2301 | if(!c[3]) continue; |
d611c74f |
2302 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2303 | fSeedTB[0]->GetClusters(cond0, index, ncl); |
41702fec |
2304 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2305 | Int_t jcl = 0; |
2306 | while(jcl<ncl) { |
d611c74f |
2307 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec |
2308 | if(!c[0]) continue; |
2309 | Double_t dx = c[3]->GetX() - c[0]->GetX(); |
2310 | Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2311 | Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx; |
d611c74f |
2312 | fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi); |
2313 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec |
2314 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2315 | |
2316 | Int_t kcl = 0; |
2317 | while(kcl<mcl) { |
d611c74f |
2318 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2319 | if(!c[1]) continue; |
2320 | fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi); |
2321 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2322 | //printf("Found c[1] candidate 2 %p\n", c[2]); |
2323 | if(!c[2]) continue; |
2324 | |
2325 | // AliInfo("Seeding clusters found. Building seeds ..."); |
2326 | // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ()); |
2327 | |
804bb02e |
2328 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec |
2329 | |
d611c74f |
2330 | FitRieman(c, chi2); |
2331 | |
2332 | AliTRDseedV1 *tseed = 0x0; |
3a039a31 |
2333 | for(int iLayer=0; iLayer<kNPlanes; iLayer++){ |
43d6ad34 |
2334 | tseed = &cseed[iLayer]; |
2335 | tseed->SetPlane(iLayer); |
2336 | tseed->SetTilt(hL[iLayer]); |
2337 | tseed->SetPadLength(padlength[iLayer]); |
3a039a31 |
2338 | tseed->SetReconstructor(fReconstructor); |
e79f8eb0 |
2339 | Double_t x_anode = stack[iLayer] ? stack[iLayer]->GetX() : x_def[iLayer]; |
2340 | tseed->SetX0(x_anode); |
d611c74f |
2341 | tseed->Init(GetRiemanFitter()); |
2342 | } |
2343 | |
2344 | Bool_t isFake = kFALSE; |
3a039a31 |
2345 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f |
2346 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2347 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2348 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2349 | |
2350 | Double_t xpos[4]; |
2351 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); |
2352 | Float_t yref[4]; |
2353 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); |
2354 | Int_t ll = c[3]->GetLabel(0); |
2355 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2356 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2357 | AliRieman *rim = GetRiemanFitter(); |
2358 | TTreeSRedirector &cs0 = *fgDebugStreamer; |
2359 | cs0 << "MakeSeeds0" |
2360 | <<"EventNumber=" << eventNumber |
2361 | <<"CandidateNumber=" << candidateNumber |
2362 | <<"isFake=" << isFake |
2363 | <<"config=" << config |
2364 | <<"label=" << ll |
2365 | <<"chi2z=" << chi2[0] |
2366 | <<"chi2y=" << chi2[1] |
2367 | <<"Y2exp=" << cond2[0] |
2368 | <<"Z2exp=" << cond2[1] |
2369 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() |
2370 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() |
2371 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() |
2372 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() |
2373 | <<"yref0=" << yref[0] |
2374 | <<"yref1=" << yref[1] |
2375 | <<"yref2=" << yref[2] |
2376 | <<"yref3=" << yref[3] |
2377 | <<"c0.=" << c[0] |
2378 | <<"c1.=" << c[1] |
2379 | <<"c2.=" << c[2] |
2380 | <<"c3.=" << c[3] |
2381 | <<"Seed0.=" << &cseed[planes[0]] |
2382 | <<"Seed1.=" << &cseed[planes[1]] |
2383 | <<"Seed2.=" << &cseed[planes[2]] |
2384 | <<"Seed3.=" << &cseed[planes[3]] |
2385 | <<"RiemanFitter.=" << rim |
2386 | <<"\n"; |
2387 | } |
2388 | |
3a039a31 |
2389 | if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
d611c74f |
2390 | //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
2391 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2392 | continue; |
2393 | } |
3a039a31 |
2394 | if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
d611c74f |
2395 | //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
2396 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2397 | continue; |
2398 | } |
2399 | //AliInfo("Passed chi2 filter."); |
2400 | |
2401 | // try attaching clusters to tracklets |
2402 | Int_t nUsedCl = 0; |
2403 | Int_t mlayers = 0; |
be24510a |
2404 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f |
2405 | Int_t jLayer = planes[iLayer]; |
2406 | if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue; |
2407 | nUsedCl += cseed[jLayer].GetNUsed(); |
2408 | if(nUsedCl > 25) break; |
2409 | mlayers++; |
2410 | } |
be24510a |
2411 | |
2412 | if(mlayers < kNSeedPlanes){ |
2413 | //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes)); |
2414 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2415 | continue; |
2416 | } |
2417 | |
2418 | // temporary exit door for the HLT |
4302c900 |
2419 | if(fReconstructor->IsHLT()){ |
be24510a |
2420 | // attach clusters to extrapolation chambers |
2421 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2422 | Int_t jLayer = planesExt[iLayer]; |
2423 | if(!(chamber = stack[jLayer])) continue; |
2424 | cseed[jLayer].AttachClustersIter(chamber, 1000.); |
2425 | } |
4302c900 |
2426 | fTrackQuality[ntracks] = 1.; // dummy value |
2427 | ntracks++; |
2428 | if(ntracks == kMaxTracksStack){ |
2429 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); |
2430 | return ntracks; |
2431 | } |
2432 | cseed += 6; |
2433 | continue; |
2434 | } |
2435 | |
be24510a |
2436 | |
d611c74f |
2437 | // fit tracklets and cook likelihood |
2438 | FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood |
2439 | chi2[0] = GetChi2Y(&cseed[0]); |
2440 | chi2[1] = GetChi2Z(&cseed[0]); |
2441 | //Chi2 definitions in testing stage |
2442 | //chi2[0] = GetChi2YTest(&cseed[0]); |
2443 | //chi2[1] = GetChi2ZTest(&cseed[0]); |
2444 | Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked |
2445 | |
3a039a31 |
2446 | if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){ |
d611c74f |
2447 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2448 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2449 | continue; |
2450 | } |
2451 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2452 | |
2453 | // book preliminary results |
2454 | seedQuality[ntracks] = like; |
2455 | fSeedLayer[ntracks] = config;/*sLayer;*/ |
2456 | |
2457 | // attach clusters to the extrapolation seeds |
d611c74f |
2458 | Int_t nusedf = 0; // debug value |
be24510a |
2459 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2460 | Int_t jLayer = planesExt[iLayer]; |
d611c74f |
2461 | if(!(chamber = stack[jLayer])) continue; |
d611c74f |
2462 | |
2463 | // fit extrapolated seed |
2464 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; |
2465 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; |
2466 | AliTRDseedV1 pseed = cseed[jLayer]; |
2467 | if(!pseed.AttachClustersIter(chamber, 1000.)) continue; |
2468 | cseed[jLayer] = pseed; |
2469 | nusedf += cseed[jLayer].GetNUsed(); // debug value |
2470 | FitTiltedRieman(cseed, kTRUE); |
2471 | } |
2472 | |
2473 | // AliInfo("Extrapolation done."); |
2474 | // Debug Stream containing all the 6 tracklets |
3a039a31 |
2475 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f |
2476 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2477 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2478 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2479 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2480 | cstreamer << "MakeSeeds1" |
2481 | << "EventNumber=" << eventNumber |
2482 | << "CandidateNumber=" << candidateNumber |
2483 | << "S0.=" << &cseed[0] |
2484 | << "S1.=" << &cseed[1] |
2485 | << "S2.=" << &cseed[2] |
2486 | << "S3.=" << &cseed[3] |
2487 | << "S4.=" << &cseed[4] |
2488 | << "S5.=" << &cseed[5] |
2489 | << "FitterT.=" << tiltedRieman |
2490 | << "\n"; |
2491 | } |
2492 | |
fb872574 |
2493 | if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){ |
d611c74f |
2494 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2495 | continue; |
2496 | } |
2497 | //AliInfo("Improve seed quality done."); |
2498 | |
2499 | // fit full track and cook likelihoods |
2500 | // Double_t curv = FitRieman(&cseed[0], chi2); |
2501 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); |
2502 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); |
2503 | |
2504 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) |
2505 | Double_t chi2Vals[3]; |
2506 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE); |
3a039a31 |
2507 | if(fReconstructor->GetRecoParam() ->IsVertexConstrained()) |
d611c74f |
2508 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2509 | else |
2510 | chi2Vals[1] = 1.; |
2511 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); |
2512 | // Chi2 definitions in testing stage |
2513 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); |
2514 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); |
2515 | //AliInfo("Hyperplane fit done\n"); |
2516 | |
2517 | // finalize tracklets |
2518 | Int_t labels[12]; |
2519 | Int_t outlab[24]; |
2520 | Int_t nlab = 0; |
2521 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { |
2522 | if (!cseed[iLayer].IsOK()) continue; |
2523 | |
2524 | if (cseed[iLayer].GetLabels(0) >= 0) { |
2525 | labels[nlab] = cseed[iLayer].GetLabels(0); |
2526 | nlab++; |
2527 | } |
2528 | |
2529 | if (cseed[iLayer].GetLabels(1) >= 0) { |
2530 | labels[nlab] = cseed[iLayer].GetLabels(1); |
2531 | nlab++; |
2532 | } |
2533 | } |
2534 | Freq(nlab,labels,outlab,kFALSE); |
2535 | Int_t label = outlab[0]; |
2536 | Int_t frequency = outlab[1]; |
2537 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { |
2538 | cseed[iLayer].SetFreq(frequency); |
2539 | cseed[iLayer].SetChi2Z(chi2[1]); |
2540 | } |
2541 | |
3a039a31 |
2542 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f |
2543 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2544 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2545 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2546 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); |
2547 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); |
2548 | cstreamer << "MakeSeeds2" |
2549 | << "EventNumber=" << eventNumber |
2550 | << "CandidateNumber=" << candidateNumber |
2551 | << "Chi2TR=" << chi2Vals[0] |
2552 | << "Chi2TC=" << chi2Vals[1] |
2553 | << "Nlayers=" << mlayers |
2554 | << "NUsedS=" << nUsedCl |
2555 | << "NUsed=" << nusedf |
2556 | << "Like=" << like |
2557 | << "S0.=" << &cseed[0] |
2558 | << "S1.=" << &cseed[1] |
2559 | << "S2.=" << &cseed[2] |
2560 | << "S3.=" << &cseed[3] |
2561 | << "S4.=" << &cseed[4] |
2562 | << "S5.=" << &cseed[5] |
2563 | << "Label=" << label |
2564 | << "Freq=" << frequency |
2565 | << "FitterT.=" << fitterT |
2566 | << "FitterTC.=" << fitterTC |
2567 | << "\n"; |
2568 | } |
2569 | |
2570 | ntracks++; |
2571 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2572 | if(ntracks == kMaxTracksStack){ |
2573 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); |
2574 | return ntracks; |
2575 | } |
2576 | cseed += 6; |
41702fec |
2577 | } |
2578 | } |
2579 | } |
41702fec |
2580 | |
2581 | return ntracks; |
e4f2f73d |
2582 | } |
2583 | |
2584 | //_____________________________________________________________________________ |
0906e73e |
2585 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params) |
e4f2f73d |
2586 | { |
41702fec |
2587 | // |
2588 | // Build a TRD track out of tracklet candidates |
2589 | // |
2590 | // Parameters : |
2591 | // seeds : array of tracklets |
2592 | // params : track parameters (see MakeSeeds() function body for a detailed description) |
2593 | // |
2594 | // Output : |
2595 | // The TRD track. |
2596 | // |
2597 | // Detailed description |
2598 | // |
2599 | // To be discussed with Marian !! |
2600 | // |
2601 | |
41702fec |
2602 | |
2603 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2604 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; |
2605 | Double_t c[15]; |
2606 | |
2607 | c[ 0] = 0.2; |
2608 | c[ 1] = 0.0; c[ 2] = 2.0; |
2609 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; |
2610 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; |
2611 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; |
2612 | |
d20df6fc |
2613 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2614 | track.PropagateTo(params[0]-5.0); |
393fda1c |
2615 | if(fReconstructor->IsHLT()) return SetTrack(&track); |
2616 | |
d20df6fc |
2617 | track.ResetCovariance(1); |
e79f8eb0 |
2618 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
393fda1c |
2619 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){ |
2620 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2621 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2622 | Double_t p[5]; // Track Params for the Debug Stream |
2623 | track.GetExternalParameters(params[0], p); |
2624 | TTreeSRedirector &cs = *fgDebugStreamer; |
2625 | cs << "MakeTrack" |
2626 | << "EventNumber=" << eventNumber |
2627 | << "CandidateNumber=" << candidateNumber |
2628 | << "nc=" << nc |
2629 | << "X=" << params[0] |
2630 | << "Y=" << p[0] |
2631 | << "Z=" << p[1] |
2632 | << "snp=" << p[2] |
2633 | << "tnd=" << p[3] |
2634 | << "crv=" << p[4] |
2635 | << "Yin=" << params[1] |
2636 | << "Zin=" << params[2] |
2637 | << "snpin=" << params[3] |
2638 | << "tndin=" << params[4] |
2639 | << "crvin=" << params[5] |
2640 | << "track.=" << &track |
2641 | << "\n"; |
2642 | } |
d20df6fc |
2643 | if (nc < 30) return 0x0; |
2644 | |
2645 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
48f8adf3 |
2646 | ptrTrack->CookLabel(.9); |
24253b0a |
2647 | |
d20df6fc |
2648 | // computes PID for track |
2649 | ptrTrack->CookPID(); |
2650 | // update calibration references using this track |
48f8adf3 |
2651 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
2652 | if (!calibra){ |
2653 | AliInfo("Could not get Calibra instance\n"); |
2654 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); |
2655 | } |
d20df6fc |
2656 | return ptrTrack; |
e4f2f73d |
2657 | } |
2658 | |
0906e73e |
2659 | |
e4f2f73d |
2660 | //____________________________________________________________________ |
eb38ed55 |
2661 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d |
2662 | { |
41702fec |
2663 | // |
2664 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst |
2665 | // |
2666 | // Parameters : |
2667 | // layers : Array of propagation layers for a stack/supermodule |
2668 | // cseed : Array of 6 seeding tracklets which has to be improved |
2669 | // |
2670 | // Output : |
2671 | // cssed : Improved seeds |
2672 | // |
2673 | // Detailed description |
2674 | // |
2675 | // Iterative procedure in which new clusters are searched for each |
2676 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) |
2677 | // can be maximized. If some optimization is found the old seeds are replaced. |
2678 | // |
2679 | // debug level: 7 |
2680 | // |
2681 | |
2682 | // make a local working copy |
2683 | AliTRDtrackingChamber *chamber = 0x0; |
2684 | AliTRDseedV1 bseed[6]; |
2685 | Int_t nLayers = 0; |
2686 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; |
2687 | |
2688 | Float_t lastquality = 10000.0; |
2689 | Float_t lastchi2 = 10000.0; |
2690 | Float_t chi2 = 1000.0; |
2691 | |
2692 | for (Int_t iter = 0; iter < 4; iter++) { |
2693 | Float_t sumquality = 0.0; |
2694 | Float_t squality[6]; |
2695 | Int_t sortindexes[6]; |
2696 | |
2697 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { |
3a039a31 |
2698 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.; |
41702fec |
2699 | sumquality += squality[jLayer]; |
2700 | } |
2701 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; |
2702 | |
2703 | nLayers = 0; |
2704 | lastquality = sumquality; |
2705 | lastchi2 = chi2; |
2706 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; |
2707 | |
2708 | TMath::Sort(6, squality, sortindexes, kFALSE); |
2709 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { |
2710 | Int_t bLayer = sortindexes[jLayer]; |
2711 | if(!(chamber = stack[bLayer])) continue; |
2712 | bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE); |
2713 | if(bseed[bLayer].IsOK()) nLayers++; |
2714 | } |
2715 | |
2716 | chi2 = FitTiltedRieman(bseed, kTRUE); |
3a039a31 |
2717 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){ |
41702fec |
2718 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2719 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2720 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2721 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2722 | cstreamer << "ImproveSeedQuality" |
2723 | << "EventNumber=" << eventNumber |
2724 | << "CandidateNumber=" << candidateNumber |
2725 | << "Iteration=" << iter |
2726 | << "S0.=" << &bseed[0] |
2727 | << "S1.=" << &bseed[1] |
2728 | << "S2.=" << &bseed[2] |
2729 | << "S3.=" << &bseed[3] |
2730 | << "S4.=" << &bseed[4] |
2731 | << "S5.=" << &bseed[5] |
2732 | << "FitterT.=" << tiltedRieman |
2733 | << "\n"; |
2734 | } |
2735 | } // Loop: iter |
2736 | |
2737 | // we are sure that at least 2 tracklets are OK ! |
2738 | return nLayers+2; |
e4f2f73d |
2739 | } |
2740 | |
eb38ed55 |
2741 | //_________________________________________________________________________ |
2742 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){ |
41702fec |
2743 | // |
2744 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for |
2745 | // the track selection |
2746 | // The likelihood value containes: |
2747 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit |
2748 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets |
2749 | // For all Parameters an exponential dependency is used |
2750 | // |
2751 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
2752 | // - Array of chi2 values: |
2753 | // * Non-Constrained Tilted Riemann fit |
2754 | // * Vertex-Constrained Tilted Riemann fit |
2755 | // * z-Direction from Linear fit |
2756 | // Output: - The calculated track likelihood |
2757 | // |
2758 | // debug level 2 |
2759 | // |
2760 | |
2761 | Double_t sumdaf = 0, nLayers = 0; |
2762 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
2763 | if(!tracklets[iLayer].IsOK()) continue; |
2764 | sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2()); |
2765 | nLayers++; |
2766 | } |
2767 | sumdaf /= Float_t (nLayers - 2.0); |
2768 | |
2769 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z |
3a039a31 |
2770 | Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ? |
d20df6fc |
2771 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
41702fec |
2772 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann |
2773 | Double_t likeAF = TMath::Exp(-sumdaf * 3.23); |
2774 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF; |
2775 | |
3a039a31 |
2776 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec |
2777 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2778 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2779 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2780 | cstreamer << "CalculateTrackLikelihood0" |
2781 | << "EventNumber=" << eventNumber |
2782 | << "CandidateNumber=" << candidateNumber |
2783 | << "LikeChi2Z=" << likeChi2Z |
2784 | << "LikeChi2TR=" << likeChi2TR |
2785 | << "LikeChi2TC=" << likeChi2TC |
2786 | << "LikeAF=" << likeAF |
2787 | << "TrackLikelihood=" << trackLikelihood |
2788 | << "\n"; |
2789 | } |
2790 | |
2791 | return trackLikelihood; |
e4f2f73d |
2792 | } |
2793 | |
2794 | //____________________________________________________________________ |
eb38ed55 |
2795 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4] |
41702fec |
2796 | , Double_t *chi2) |
e4f2f73d |
2797 | { |
41702fec |
2798 | // |
2799 | // Calculate the probability of this track candidate. |
2800 | // |
2801 | // Parameters : |
2802 | // cseeds : array of candidate tracklets |
2803 | // planes : array of seeding planes (see seeding configuration) |
2804 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. |
2805 | // |
2806 | // Output : |
2807 | // likelihood value |
2808 | // |
2809 | // Detailed description |
2810 | // |
2811 | // The track quality is estimated based on the following 4 criteria: |
2812 | // 1. precision of the rieman fit on the Y direction (likea) |
2813 | // 2. chi2 on the Y direction (likechi2y) |
2814 | // 3. chi2 on the Z direction (likechi2z) |
2815 | // 4. number of attached clusters compared to a reference value |
2816 | // (see AliTRDrecoParam::fkFindable) (likeN) |
2817 | // |
2818 | // The distributions for each type of probabilities are given below as of |
2819 | // (date). They have to be checked to assure consistency of estimation. |
2820 | // |
2821 | |
2822 | // ratio of the total number of clusters/track which are expected to be found by the tracker. |
3a039a31 |
2823 | Float_t fgFindable = fReconstructor->GetRecoParam() ->GetFindableClusters(); |
41702fec |
2824 | |
2825 | |
2826 | Int_t nclusters = 0; |
2827 | Double_t sumda = 0.; |
2828 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ |
2829 | Int_t jlayer = planes[ilayer]; |
2830 | nclusters += cseed[jlayer].GetN2(); |
2831 | sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1)); |
2832 | } |
2833 | Double_t likea = TMath::Exp(-sumda*10.6); |
2834 | Double_t likechi2y = 0.0000000001; |
2835 | if (chi2[0] < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2[0]) * 7.73); |
2836 | Double_t likechi2z = TMath::Exp(-chi2[1] * 0.088) / TMath::Exp(-chi2[1] * 0.019); |
2837 | Int_t enc = Int_t(fgFindable*4.*fgNTimeBins); // Expected Number Of Clusters, normally 72 |
2838 | Double_t likeN = TMath::Exp(-(enc - nclusters) * 0.19); |
2839 | |
2840 | Double_t like = likea * likechi2y * likechi2z * likeN; |
2841 | |
2842 | // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN)); |
3a039a31 |
2843 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec |
2844 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2845 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2846 | // The Debug Stream contains the seed |
2847 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
2848 | cstreamer << "CookLikelihood" |
2849 | << "EventNumber=" << eventNumber |
2850 | << "CandidateNumber=" << candidateNumber |
2851 | << "tracklet0.=" << &cseed[0] |
2852 | << "tracklet1.=" << &cseed[1] |
2853 | << "tracklet2.=" << &cseed[2] |
2854 | << "tracklet3.=" << &cseed[3] |
2855 | << "tracklet4.=" << &cseed[4] |
2856 | << "tracklet5.=" << &cseed[5] |
2857 | << "sumda=" << sumda |
2858 | << "chi0=" << chi2[0] |
2859 | << "chi1=" << chi2[1] |
2860 | << "likea=" << likea |
2861 | << "likechi2y=" << likechi2y |
2862 | << "likechi2z=" << likechi2z |
2863 | << "nclusters=" << nclusters |
2864 | << "likeN=" << likeN |
2865 | << "like=" << like |
2866 | << "\n"; |
2867 | } |
2868 | |
2869 | return like; |
e4f2f73d |
2870 | } |
2871 | |
eb38ed55 |
2872 | |
e4f2f73d |
2873 | |
2874 | //____________________________________________________________________ |
0906e73e |
2875 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d |
2876 | { |
41702fec |
2877 | // |
2878 | // Map seeding configurations to detector planes. |
2879 | // |
2880 | // Parameters : |
2881 | // iconfig : configuration index |
2882 | // planes : member planes of this configuration. On input empty. |
2883 | // |
2884 | // Output : |
2885 | // planes : contains the planes which are defining the configuration |
2886 | // |
2887 | // Detailed description |
2888 | // |
2889 | // Here is the list of seeding planes configurations together with |
2890 | // their topological classification: |
2891 | // |
2892 | // 0 - 5432 TQ 0 |
2893 | // 1 - 4321 TQ 0 |
2894 | // 2 - 3210 TQ 0 |
2895 | // 3 - 5321 TQ 1 |
2896 | // 4 - 4210 TQ 1 |
2897 | // 5 - 5431 TQ 1 |
2898 | // 6 - 4320 TQ 1 |
2899 | // 7 - 5430 TQ 2 |
2900 | // 8 - 5210 TQ 2 |
2901 | // 9 - 5421 TQ 3 |
2902 | // 10 - 4310 TQ 3 |
2903 | // 11 - 5410 TQ 4 |
2904 | // 12 - 5420 TQ 5 |
2905 | // 13 - 5320 TQ 5 |
2906 | // 14 - 5310 TQ 5 |
2907 | // |
2908 | // The topologic quality is modeled as follows: |
2909 | // 1. The general model is define by the equation: |
2910 | // p(conf) = exp(-conf/2) |
2911 | // 2. According to the topologic classification, configurations from the same |
2912 | // class are assigned the agerage value over the model values. |
2913 | // 3. Quality values are normalized. |
2914 | // |
2915 | // The topologic quality distribution as function of configuration is given below: |
2916 | //Begin_Html |
2917 | // <img src="gif/topologicQA.gif"> |
2918 | //End_Html |
2919 | // |
2920 | |
2921 | switch(iconfig){ |
2922 | case 0: // 5432 TQ 0 |
2923 | planes[0] = 2; |
2924 | planes[1] = 3; |
2925 | planes[2] = 4; |
2926 | planes[3] = 5; |
2927 | break; |
2928 | case 1: // 4321 TQ 0 |
2929 | planes[0] = 1; |
2930 | planes[1] = 2; |
2931 | planes[2] = 3; |
2932 | planes[3] = 4; |
2933 | break; |
2934 | case 2: // 3210 TQ 0 |
2935 | planes[0] = 0; |
2936 | planes[1] = 1; |
2937 | planes[2] = 2; |
2938 | planes[3] = 3; |
2939 | break; |
2940 | case 3: // 5321 TQ 1 |
2941 | planes[0] = 1; |
2942 | planes[1] = 2; |
2943 | planes[2] = 3; |
2944 | planes[3] = 5; |
2945 | break; |
2946 | case 4: // 4210 TQ 1 |
2947 | planes[0] = 0; |
2948 | planes[1] = 1; |
2949 | planes[2] = 2; |
2950 | planes[3] = 4; |
2951 | break; |
2952 | case 5: // 5431 TQ 1 |
2953 | planes[0] = 1; |
2954 | planes[1] = 3; |
2955 | planes[2] = 4; |
2956 | planes[3] = 5; |
2957 | break; |
2958 | case 6: // 4320 TQ 1 |
2959 | planes[0] = 0; |
2960 | planes[1] = 2; |
2961 | planes[2] = 3; |
2962 | planes[3] = 4; |
2963 | break; |
2964 | case 7: // 5430 TQ 2 |
2965 | planes[0] = 0; |
2966 | planes[1] = 3; |
2967 | planes[2] = 4; |
2968 | planes[3] = 5; |
2969 | break; |
2970 | case 8: // 5210 TQ 2 |
2971 | planes[0] = 0; |
2972 | planes[1] = 1; |
2973 | planes[2] = 2; |
2974 | planes[3] = 5; |
2975 | break; |
2976 | case 9: // 5421 TQ 3 |
2977 | planes[0] = 1; |
2978 | planes[1] = 2; |
2979 | planes[2] = 4; |
2980 | planes[3] = 5; |
2981 | break; |
2982 | case 10: // 4310 TQ 3 |
2983 | planes[0] = 0; |
2984 | planes[1] = 1; |
2985 | planes[2] = 3; |
2986 | planes[3] = 4; |
2987 | break; |
2988 | case 11: // 5410 TQ 4 |
2989 | planes[0] = 0; |
2990 | planes[1] = 1; |
2991 | planes[2] = 4; |
2992 | planes[3] = 5; |
2993 | break; |
2994 | case 12: // 5420 TQ 5 |
2995 | planes[0] = 0; |
2996 | planes[1] = 2; |
2997 | planes[2] = 4; |
2998 | planes[3] = 5; |
2999 | break; |
3000 | case 13: // 5320 TQ 5 |
3001 | planes[0] = 0; |
3002 | planes[1] = 2; |
3003 | planes[2] = 3; |
3004 | planes[3] = 5; |
3005 | break; |
3006 | case 14: // 5310 TQ 5 |
3007 | planes[0] = 0; |
3008 | planes[1] = 1; |
3009 | planes[2] = 3; |
3010 | planes[3] = 5; |
3011 | break; |
3012 | } |
e4f2f73d |
3013 | } |
3014 | |
3015 | //____________________________________________________________________ |
0906e73e |
3016 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d |
3017 | { |
41702fec |
3018 | // |
3019 | // Returns the extrapolation planes for a seeding configuration. |
3020 | // |
3021 | // Parameters : |
3022 | // iconfig : configuration index |
3023 | // planes : planes which are not in this configuration. On input empty. |
3024 | // |
3025 | // Output : |
3026 | // planes : contains the planes which are not in the configuration |
3027 | // |
3028 | // Detailed description |
3029 | // |
3030 | |
3031 | switch(iconfig){ |
3032 | case 0: // 5432 TQ 0 |
3033 | planes[0] = 1; |
3034 | planes[1] = 0; |
3035 | break; |
3036 | case 1: // 4321 TQ 0 |
3037 | planes[0] = 5; |
3038 | planes[1] = 0; |
3039 | break; |
3040 | case 2: // 3210 TQ 0 |
3041 | planes[0] = 4; |
3042 | planes[1] = 5; |
3043 | break; |
3044 | case 3: // 5321 TQ 1 |
3045 | planes[0] = 4; |
3046 | planes[1] = 0; |
3047 | break; |
3048 | case 4: // 4210 TQ 1 |
3049 | planes[0] = 5; |
3050 | planes[1] = 3; |
3051 | break; |
3052 | case 5: // 5431 TQ 1 |
3053 | planes[0] = 2; |
3054 | planes[1] = 0; |
3055 | break; |
3056 | case 6: // 4320 TQ 1 |
3057 | planes[0] = 5; |
3058 | planes[1] = 1; |
3059 | break; |
3060 | case 7: // 5430 TQ 2 |
3061 | planes[0] = 2; |
3062 | planes[1] = 1; |
3063 | break; |
3064 | case 8: // 5210 TQ 2 |
3065 | planes[0] = 4; |
3066 | planes[1] = 3; |
3067 | break; |
3068 | case 9: // 5421 TQ 3 |
3069 | planes[0] = 3; |
3070 | planes[1] = 0; |
3071 | break; |
3072 | case 10: // 4310 TQ 3 |
3073 | planes[0] = 5; |
3074 | planes[1] = 2; |
3075 | break; |
3076 | case 11: // 5410 TQ 4 |
3077 | planes[0] = 3; |
3078 | planes[1] = 2; |
3079 | break; |
3080 | case 12: // 5420 TQ 5 |
3081 | planes[0] = 3; |
3082 | planes[1] = 1; |
3083 | break; |
3084 | case 13: // 5320 TQ 5 |
3085 | planes[0] = 4; |
3086 | planes[1] = 1; |
3087 | break; |
3088 | case 14: // 5310 TQ 5 |
3089 | planes[0] = 4; |
3090 | planes[1] = 2; |
3091 | break; |
3092 | } |
e4f2f73d |
3093 | } |
eb38ed55 |
3094 | |
3095 | //____________________________________________________________________ |
3096 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const |
3097 | { |
41702fec |
3098 | Int_t ncls = fClusters->GetEntriesFast(); |
2f7514a6 |
3099 | return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0; |
eb38ed55 |
3100 | } |
3101 | |
3b57a3f7 |
3102 | //____________________________________________________________________ |
3103 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const |
3104 | { |
41702fec |
3105 | Int_t ntrklt = fTracklets->GetEntriesFast(); |
2f7514a6 |
3106 | return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0; |
3b57a3f7 |
3107 | } |
3108 | |
3109 | //____________________________________________________________________ |
3110 | AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const |
3111 | { |
41702fec |
3112 | Int_t ntrk = fTracks->GetEntriesFast(); |
2f7514a6 |
3113 | return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0; |
3b57a3f7 |
3114 | } |
3115 | |
bb56afff |
3116 | //____________________________________________________________________ |
3117 | Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){ |
41702fec |
3118 | // |
3119 | // Calculates the reference x-position for the tilted Rieman fit defined as middle |
3120 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets |
3121 | // are taken into account |
3122 | // |
3123 | // Parameters: - Array of tracklets(AliTRDseedV1) |
3124 | // |
3125 | // Output: - The reference x-position(Float_t) |
3126 | // |
3127 | Int_t nDistances = 0; |
3128 | Float_t meanDistance = 0.; |
3129 | Int_t startIndex = 5; |
3130 | for(Int_t il =5; il > 0; il--){ |
3131 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ |
3132 | Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0(); |
3133 | meanDistance += xdiff; |
3134 | nDistances++; |
3135 | } |
3136 | if(tracklets[il].IsOK()) startIndex = il; |
3137 | } |
3138 | if(tracklets[0].IsOK()) startIndex = 0; |
3139 | if(!nDistances){ |
3140 | // We should normally never get here |
3141 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); |
3142 | Int_t iok = 0, idiff = 0; |
3143 | // This attempt is worse and should be avoided: |
3144 | // check for two chambers which are OK and repeat this without taking the mean value |
3145 | // Strategy avoids a division by 0; |
3146 | for(Int_t il = 5; il >= 0; il--){ |
3147 | if(tracklets[il].IsOK()){ |
3148 | xpos[iok] = tracklets[il].GetX0(); |
3149 | iok++; |
3150 | startIndex = il; |
3151 | } |
3152 | if(iok) idiff++; // to get the right difference; |
3153 | if(iok > 1) break; |
3154 | } |
3155 | if(iok > 1){ |
3156 | meanDistance = (xpos[0] - xpos[1])/idiff; |
3157 | } |
3158 | else{ |
3159 | // we have do not even have 2 layers which are OK? The we do not need to fit at all |
3160 | return 331.; |
3161 | } |
3162 | } |
3163 | else{ |
3164 | meanDistance /= nDistances; |
3165 | } |
3166 | return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); |
bb56afff |
3167 | } |
eb38ed55 |
3168 | |
3169 | //_____________________________________________________________________________ |
3170 | Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist |
41702fec |
3171 | , Int_t *outlist, Bool_t down) |
eb38ed55 |
3172 | { |
41702fec |
3173 | // |
3174 | // Sort eleements according occurancy |
3175 | // The size of output array has is 2*n |
3176 | // |
3177 | |
3178 | if (n <= 0) { |
3179 | return 0; |
3180 | } |
3181 | |
3182 | Int_t *sindexS = new Int_t[n]; // Temporary array for sorting |
3183 | Int_t *sindexF = new Int_t[2*n]; |
3184 | for (Int_t i = 0; i < n; i++) { |
3185 | sindexF[i] = 0; |
3186 | } |
3187 | |
3188 | TMath::Sort(n,inlist,sindexS,down); |
3189 | |
3190 | Int_t last = inlist[sindexS[0]]; |
3191 | Int_t val = last; |
3192 | sindexF[0] = 1; |
3193 | sindexF[0+n] = last; |
3194 | Int_t countPos = 0; |
3195 | |
3196 | // Find frequency |
3197 | for (Int_t i = 1; i < n; i++) { |
3198 | val = inlist[sindexS[i]]; |
3199 | if (last == val) { |
3200 | sindexF[countPos]++; |
3201 | } |
3202 | else { |
3203 | countPos++; |
3204 | sindexF[countPos+n] = val; |
3205 | sindexF[countPos]++; |
3206 | last = val; |
3207 | } |
3208 | } |
3209 | if (last == val) { |
3210 | countPos++; |
3211 | } |
3212 | |
3213 | // Sort according frequency |
3214 | TMath::Sort(countPos,sindexF,sindexS,kTRUE); |
3215 | |
3216 | for (Int_t i = 0; i < countPos; i++) { |
3217 | outlist[2*i ] = sindexF[sindexS[i]+n]; |
3218 | outlist[2*i+1] = sindexF[sindexS[i]]; |
3219 | } |
3220 | |
3221 | delete [] sindexS; |
3222 | delete [] sindexF; |
3223 | |
3224 | return countPos; |
eb38ed55 |
3225 | |
3226 | } |
bb56afff |
3227 | |
06b32d95 |
3228 | |
3229 | //____________________________________________________________________ |
3230 | void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec) |
3231 | { |
3232 | fReconstructor = rec; |
3233 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
3234 | if(!fgDebugStreamer){ |
3235 | TDirectory *savedir = gDirectory; |
3236 | fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root"); |
3237 | savedir->cd(); |
3238 | } |
3239 | } |
acd241e9 |
3240 | } |
3241 | |
bb56afff |
3242 | //_____________________________________________________________________________ |
3243 | Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const |
3244 | { |
41702fec |
3245 | // Chi2 definition on y-direction |
3246 | |
3247 | Float_t chi2 = 0; |
3248 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
3249 | if(!tracklets[ipl].IsOK()) continue; |
3250 | Double_t distLayer = tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0); |
3251 | chi2 += distLayer * distLayer; |
3252 | } |
3253 | return chi2; |
bb56afff |
3254 | } |
3255 | |
d611c74f |
3256 | //____________________________________________________________________ |
3257 | void AliTRDtrackerV1::ResetSeedTB() |
3258 | { |
3259 | // reset buffer for seeding time bin layers. If the time bin |
3260 | // layers are not allocated this function allocates them |
3261 | |
3262 | for(Int_t isl=0; isl<kNSeedPlanes; isl++){ |
3263 | if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin(); |
3264 | else fSeedTB[isl]->Clear(); |
3265 | } |
3266 | } |
3267 | |
bb56afff |
3268 | //_____________________________________________________________________________ |
3269 | Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const |
3270 | { |
41702fec |
3271 | // Chi2 definition on z-direction |
3272 | |
3273 | Float_t chi2 = 0; |
3274 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
3275 | if(!tracklets[ipl].IsOK()) continue; |
3276 | Double_t distLayer = tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0); |
3277 | chi2 += distLayer * distLayer; |
3278 | } |
3279 | return chi2; |
bb56afff |
3280 | } |
8acca6a3 |
3281 | |
3282 | /////////////////////////////////////////////////////// |
3283 | // // |
3284 | // Resources of class AliTRDLeastSquare // |
3285 | // // |
3286 | /////////////////////////////////////////////////////// |
3287 | |
3288 | //_____________________________________________________________________________ |
3289 | AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){ |
41702fec |
3290 | // |
3291 | // Constructor of the nested class AliTRDtrackFitterLeastSquare |
3292 | // |
3293 | memset(fParams, 0, sizeof(Double_t) * 2); |
3294 | memset(fSums, 0, sizeof(Double_t) * 5); |
3295 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); |
8acca6a3 |
3296 | |
3297 | } |
3298 | |
3299 | //_____________________________________________________________________________ |
3300 | void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){ |
41702fec |
3301 | // |
3302 | // Adding Point to the fitter |
3303 | // |
3304 | Double_t weight = 1/(sigmaY * sigmaY); |
3305 | Double_t &xpt = *x; |
3306 | // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY); |
3307 | fSums[0] += weight; |
3308 | fSums[1] += weight * xpt; |
3309 | fSums[2] += weight * y; |
3310 | fSums[3] += weight * xpt * y; |
3311 | fSums[4] += weight * xpt * xpt; |
3312 | fSums[5] += weight * y * y; |
8acca6a3 |
3313 | } |
3314 | |
3315 | //_____________________________________________________________________________ |
3316 | void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){ |
41702fec |
3317 | // |
3318 | // Remove Point from the sample |
3319 | // |
3320 | Double_t weight = 1/(sigmaY * sigmaY); |
3321 | Double_t &xpt = *x; |
3322 | fSums[0] -= weight; |
3323 | fSums[1] -= weight * xpt; |
3324 | fSums[2] -= weight * y; |
3325 | fSums[3] -= weight * xpt * y; |
3326 | fSums[4] -= weight * xpt * xpt; |
3327 | fSums[5] -= weight * y * y; |
8acca6a3 |
3328 | } |
3329 | |
3330 | //_____________________________________________________________________________ |
3331 | void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){ |
41702fec |
3332 | // |
3333 | // Evaluation of the fit: |
3334 | // Calculation of the parameters |
3335 | // Calculation of the covariance matrix |
3336 | // |
3337 | |
3338 | Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1]; |
aec26713 |
3339 | if(denominator==0) return; |
3340 | |
41702fec |
3341 | // for(Int_t isum = 0; isum < 5; isum++) |
3342 | // printf("fSums[%d] = %f\n", isum, fSums[isum]); |
3343 | // printf("denominator = %f\n", denominator); |
3344 | fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator; |
3345 | fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator; |
3346 | // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]); |
3347 | |
3348 | // Covariance matrix |
3349 | fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0]; |
3350 | fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0]; |
3351 | fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0]; |
8acca6a3 |
3352 | } |
3353 | |
46b6abd7 |
3354 | //_____________________________________________________________________________ |
3355 | Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const { |
41702fec |
3356 | // |
3357 | // Returns the Function value of the fitted function at a given x-position |
3358 | // |
3359 | return fParams[0] + fParams[1] * (*xpos); |
46b6abd7 |
3360 | } |
3361 | |
3362 | //_____________________________________________________________________________ |
3363 | void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const { |
41702fec |
3364 | // |
3365 | // Copies the values of the covariance matrix into the storage |
3366 | // |
3367 | memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3); |
46b6abd7 |
3368 | } |
3369 | |