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