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