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Introduce setter for fgkTracklet
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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e4f2f73d 1/**************************************************************************
972ef65e 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
7* Permission to use, copy, modify and distribute this software and its *
8* documentation strictly for non-commercial purposes is hereby granted *
9* without fee, provided that the above copyright notice appears in all *
10* copies and that both the copyright notice and this permission notice *
11* appear in the supporting documentation. The authors make no claims *
12* about the suitability of this software for any purpose. It is *
13* provided "as is" without express or implied warranty. *
14**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// Track finder //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26///////////////////////////////////////////////////////////////////////////////
27
bb56afff 28// #include <Riostream.h>
29// #include <stdio.h>
30// #include <string.h>
e4f2f73d 31
32#include <TBranch.h>
bb56afff 33#include <TDirectory.h>
e4f2f73d 34#include <TLinearFitter.h>
e4f2f73d 35#include <TTree.h>
36#include <TClonesArray.h>
e4f2f73d 37#include <TTreeStream.h>
eb2b4f91 38#include <TGeoMatrix.h>
39#include <TGeoManager.h>
e4f2f73d 40
41#include "AliLog.h"
fac58f00 42#include "AliMathBase.h"
e4f2f73d 43#include "AliESDEvent.h"
bb56afff 44#include "AliGeomManager.h"
e4f2f73d 45#include "AliRieman.h"
46#include "AliTrackPointArray.h"
47
e4f2f73d 48#include "AliTRDgeometry.h"
49#include "AliTRDpadPlane.h"
e4f2f73d 50#include "AliTRDcalibDB.h"
e4f2f73d 51#include "AliTRDReconstructor.h"
52#include "AliTRDCalibraFillHisto.h"
e4f2f73d 53#include "AliTRDrecoParam.h"
bb56afff 54
55#include "AliTRDcluster.h"
e4f2f73d 56#include "AliTRDseedV1.h"
0906e73e 57#include "AliTRDtrackV1.h"
bb56afff 58#include "AliTRDtrackerV1.h"
59#include "AliTRDtrackerDebug.h"
60#include "AliTRDtrackingChamber.h"
61#include "AliTRDchamberTimeBin.h"
62
e4f2f73d 63
e4f2f73d 64
65ClassImp(AliTRDtrackerV1)
eb38ed55 66
67
68const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
69const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
70const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
71const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
72const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 73Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 74 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
75 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
76 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e165b64b 77};
78const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
79 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2985ffcb 80Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 81AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
82TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
83TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 84
85//____________________________________________________________________
3a039a31 86AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 87 :AliTracker()
06b32d95 88 ,fReconstructor(0x0)
eb2b4f91 89 ,fGeom(0x0)
41702fec 90 ,fClusters(0x0)
91 ,fTracklets(0x0)
92 ,fTracks(0x0)
93 ,fSieveSeeding(0)
e4f2f73d 94{
41702fec 95 //
96 // Default constructor.
97 //
eb2b4f91 98
99 SetReconstructor(rec); // initialize reconstructor
100
101 // initialize geometry
102 if(!AliGeomManager::GetGeometry()){
103 AliFatal("Could not get geometry.");
104 }
105 fGeom = new AliTRDgeometry();
106 fGeom->CreateClusterMatrixArray();
107 TGeoHMatrix *matrix = 0x0;
108 Double_t loc[] = {0., 0., 0.};
109 Double_t glb[] = {0., 0., 0.};
110 for(Int_t ily=kNPlanes; ily--;){
e165b64b 111 Int_t ism = 0;
112 while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
113 if(!matrix){
114 AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
115 fR[ily] = fgkX0[ily];
eb2b4f91 116 continue;
117 }
118 matrix->LocalToMaster(loc, glb);
119 fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
120 }
121
122 // initialize calibration values
a7ac01d2 123 AliTRDcalibDB *trd = 0x0;
124 if (!(trd = AliTRDcalibDB::Instance())) {
eb2b4f91 125 AliFatal("Could not get calibration.");
41702fec 126 }
a7ac01d2 127 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 128
eb2b4f91 129 // initialize cluster containers
053767a4 130 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 131
eb2b4f91 132 // initialize arrays
133 memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
134 memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
135 memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
eb38ed55 136}
137
e4f2f73d 138//____________________________________________________________________
139AliTRDtrackerV1::~AliTRDtrackerV1()
140{
41702fec 141 //
142 // Destructor
143 //
144
f7ab3117 145 if(fgRieman) delete fgRieman; fgRieman = 0x0;
146 if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
147 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
d611c74f 148 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 149 if(fTracks) {fTracks->Delete(); delete fTracks;}
150 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 151 if(fClusters) {
152 fClusters->Delete(); delete fClusters;
153 }
41702fec 154 if(fGeom) delete fGeom;
e4f2f73d 155}
156
157//____________________________________________________________________
158Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
159{
41702fec 160 //
161 // Steering stand alone tracking for full TRD detector
162 //
163 // Parameters :
164 // esd : The ESD event. On output it contains
165 // the ESD tracks found in TRD.
166 //
167 // Output :
168 // Number of tracks found in the TRD detector.
169 //
170 // Detailed description
171 // 1. Launch individual SM trackers.
172 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
173 //
174
3a039a31 175 if(!fReconstructor->GetRecoParam() ){
176 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 177 return 0;
178 }
179
180 //AliInfo("Start Track Finder ...");
181 Int_t ntracks = 0;
053767a4 182 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 183 // for(int ism=1; ism<2; ism++){
184 //AliInfo(Form("Processing supermodule %i ...", ism));
185 ntracks += Clusters2TracksSM(ism, esd);
186 }
187 AliInfo(Form("Number of found tracks : %d", ntracks));
188 return ntracks;
e4f2f73d 189}
190
0906e73e 191
192//_____________________________________________________________________________
eb38ed55 193Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 194{
41702fec 195 //AliInfo(Form("Asking for tracklet %d", index));
196
84eab75a 197 // reset position of the point before using it
198 p.SetXYZ(0., 0., 0.);
2f7514a6 199 AliTRDseedV1 *tracklet = GetTracklet(index);
200 if (!tracklet) return kFALSE;
84eab75a 201
41702fec 202 // get detector for this tracklet
e165b64b 203 Int_t det = tracklet->GetDetector();
204 Int_t sec = fGeom->GetSector(det);
205 Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
206 sinA = TMath::Sin(alpha),
207 cosA = TMath::Cos(alpha);
41702fec 208 Double_t local[3];
e165b64b 209 local[0] = tracklet->GetX();
210 local[1] = tracklet->GetY();
211 local[2] = tracklet->GetZ();
41702fec 212 Double_t global[3];
e165b64b 213 fGeom->RotateBack(det, local, global);
214
215 Double_t cov2D[3]; Float_t cov[6];
216 tracklet->GetCovAt(local[0], cov2D);
217 cov[0] = cov2D[0]*sinA*sinA;
218 cov[1] =-cov2D[0]*sinA*cosA;
219 cov[2] =-cov2D[1]*sinA;
220 cov[3] = cov2D[0]*cosA*cosA;
221 cov[4] = cov2D[1]*cosA;
222 cov[5] = cov2D[2];
223 // store the global position of the tracklet and its covariance matrix in the track point
224 p.SetXYZ(global[0],global[1],global[2], cov);
41702fec 225
226 // setting volume id
e165b64b 227 AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
228 Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
41702fec 229 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
230 p.SetVolumeID(volid);
231
232 return kTRUE;
0906e73e 233}
234
eb38ed55 235//____________________________________________________________________
236TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
237{
41702fec 238 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
239 return fgTiltedRieman;
eb38ed55 240}
0906e73e 241
eb38ed55 242//____________________________________________________________________
243TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
244{
41702fec 245 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
246 return fgTiltedRiemanConstrained;
eb38ed55 247}
41702fec 248
eb38ed55 249//____________________________________________________________________
250AliRieman* AliTRDtrackerV1::GetRiemanFitter()
251{
fac58f00 252 if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
41702fec 253 return fgRieman;
eb38ed55 254}
41702fec 255
0906e73e 256//_____________________________________________________________________________
257Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
258{
2a3191bb 259// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
260// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
261// covariance, PID, etc.) are than used to update the corresponding ESD track.
262// Each track seed is first propagated to the geometrical limit of the TRD detector.
263// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
264// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
265// Otherwise the ESD track is left unchanged.
266//
267// The following steps are performed:
268// 1. Selection of tracks based on the variance in the y-z plane.
269// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
270// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
271// the following status bits:
272// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
273// - AliESDtrack::kTRDStop - if the tracks fails propagation
274// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
275// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
276// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
277//
278
279 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
41702fec 280 if (!calibra) AliInfo("Could not get Calibra instance\n");
281
eb2b4f91 282 // Define scalers
283 Int_t nFound = 0, // number of tracks found
284 nSeeds = 0, // total number of ESD seeds
285 nTRDseeds= 0, // number of seeds in the TRD acceptance
286 nTPCseeds= 0; // number of TPC seeds
41702fec 287 Float_t foundMin = 20.0;
288
d611c74f 289 Float_t *quality = 0x0;
290 Int_t *index = 0x0;
eb2b4f91 291 nSeeds = event->GetNumberOfTracks();
292 // Sort tracks according to quality
293 // (covariance in the yz plane)
294 if(nSeeds){
295 quality = new Float_t[nSeeds];
296 index = new Int_t[nSeeds];
297 for (Int_t iSeed = nSeeds; iSeed--;) {
d611c74f 298 AliESDtrack *seed = event->GetTrack(iSeed);
299 Double_t covariance[15];
300 seed->GetExternalCovariance(covariance);
301 quality[iSeed] = covariance[0] + covariance[2];
302 }
eb2b4f91 303 TMath::Sort(nSeeds, quality, index,kFALSE);
41702fec 304 }
41702fec 305
eb2b4f91 306 // Propagate all seeds
41702fec 307 Int_t expectedClr;
308 AliTRDtrackV1 track;
eb2b4f91 309 for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
41702fec 310
311 // Get the seeds in sorted sequence
312 AliESDtrack *seed = event->GetTrack(index[iSeed]);
eb2b4f91 313 Float_t p4 = seed->GetC(seed->GetBz());
41702fec 314
315 // Check the seed status
316 ULong_t status = seed->GetStatus();
317 if ((status & AliESDtrack::kTPCout) == 0) continue;
318 if ((status & AliESDtrack::kTRDout) != 0) continue;
eb2b4f91 319
320 // Propagate to the entrance in the TRD mother volume
41702fec 321 new(&track) AliTRDtrackV1(*seed);
eb2b4f91 322 if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
323 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
324 continue;
325 }
326 if(!AdjustSector(&track)){
327 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
328 continue;
329 }
330 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
331 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
332 continue;
333 }
334
335 nTPCseeds++;
e4d4864b 336
eb2b4f91 337 // store track status at TRD entrance
76b60503 338 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
ae3fbe1f 339
eb2b4f91 340 // prepare track and do propagation in the TRD
341 track.SetReconstructor(fReconstructor);
342 track.SetKink(Bool_t(seed->GetKinkIndex(0)));
343 expectedClr = FollowBackProlongation(track);
344 // check if track entered the TRD fiducial volume
345 if(track.GetTrackLow()){
346 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
347 nTRDseeds++;
348 }
349 // check if track was stopped in the TRD
350 if (expectedClr<0){
351 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
352 continue;
353 }
ae3fbe1f 354
355 if(expectedClr){
eb2b4f91 356 nFound++;
41702fec 357 // computes PID for track
358 track.CookPID();
359 // update calibration references using this track
360 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
361 // save calibration object
eb2b4f91 362 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
224f357f 363 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
364 calibTrack->SetOwner();
365 seed->AddCalibObject(calibTrack);
366 }
367 //update ESD track
41702fec 368 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 369 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 370 track.UpdateESDtrack(seed);
41702fec 371 }
372 }
373
27fbeba8 374 if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
e3cf3d02 375
41702fec 376 // Make backup for back propagation
41702fec 377 Int_t foundClr = track.GetNumberOfClusters();
378 if (foundClr >= foundMin) {
41702fec 379 track.CookLabel(1. - fgkLabelFraction);
f29f13a6 380 //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 381
382 // Sign only gold tracks
383 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
f29f13a6 384 //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
41702fec 385 }
386 Bool_t isGold = kFALSE;
387
388 // Full gold track
389 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
390 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
391
392 isGold = kTRUE;
393 }
394
395 // Almost gold track
396 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
397 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
398 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
399
400 isGold = kTRUE;
401 }
402
403 if ((!isGold) && (track.GetBackupTrack())) {
404 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
405 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
406 isGold = kTRUE;
407 }
408 }
41702fec 409 }
410 }
411
eb2b4f91 412 // Propagation to the TOF
413 if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
414 Int_t sm = track.GetSector();
415 // default value in case we have problems with the geometry.
416 Double_t xtof = 371.;
417 //Calculate radial position of the beginning of the TOF
418 //mother volume. In order to avoid mixing of the TRD
419 //and TOF modules some hard values are needed. This are:
420 //1. The path to the TOF module.
421 //2. The width of the TOF (29.05 cm)
422 //(with the help of Annalisa de Caro Mar-17-2009)
423 if(gGeoManager){
424 gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
425 TGeoHMatrix *m = 0x0;
426 Double_t loc[]={0., 0., -.5*29.05}, glob[3];
427
428 if((m=gGeoManager->GetCurrentMatrix())){
429 m->LocalToMaster(loc, glob);
430 xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
431 }
41702fec 432 }
672b48bd 433 if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
434 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
435 continue;
436 }
437 if(!AdjustSector(&track)){
438 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
439 continue;
440 }
441 if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
442 seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
443 continue;
444 }
eb2b4f91 445 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
446 // TODO obsolete - delete
447 seed->SetTRDQuality(track.StatusForTOF());
41702fec 448 }
41702fec 449 seed->SetTRDBudget(track.GetBudget(0));
450 }
d611c74f 451 if(index) delete [] index;
452 if(quality) delete [] quality;
41702fec 453
d4cf71ca 454 AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
455 AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
456
d611c74f 457 // run stand alone tracking
3a039a31 458 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 459
460 return 0;
0906e73e 461}
462
463
464//____________________________________________________________________
465Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
466{
41702fec 467 //
468 // Refits tracks within the TRD. The ESD event is expected to contain seeds
469 // at the outer part of the TRD.
470 // The tracks are propagated to the innermost time bin
471 // of the TRD and the ESD event is updated
472 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
473 //
474
475 Int_t nseed = 0; // contor for loaded seeds
476 Int_t found = 0; // contor for updated TRD tracks
477
478
479 AliTRDtrackV1 track;
480 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
481 AliESDtrack *seed = event->GetTrack(itrack);
482 new(&track) AliTRDtrackV1(*seed);
483
484 if (track.GetX() < 270.0) {
485 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
486 continue;
487 }
488
e3cf3d02 489 // reject tracks which failed propagation in the TRD or
490 // are produced by the TRD stand alone tracker
41702fec 491 ULong_t status = seed->GetStatus();
e3cf3d02 492 if(!(status & AliESDtrack::kTRDout)) continue;
493 if(!(status & AliESDtrack::kTRDin)) continue;
41702fec 494 nseed++;
495
496 track.ResetCovariance(50.0);
497
498 // do the propagation and processing
499 Bool_t kUPDATE = kFALSE;
500 Double_t xTPC = 250.0;
501 if(FollowProlongation(track)){
502 // Prolongate to TPC
503 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
e3cf3d02 504 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
505 found++;
506 kUPDATE = kTRUE;
507 }
508
509 // Update the friend track
510 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
511 TObject *o = 0x0; Int_t ic = 0;
512 AliTRDtrackV1 *calibTrack = 0x0;
513 while((o = seed->GetCalibObject(ic++))){
514 if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
515 calibTrack->SetTrackHigh(track.GetTrackHigh());
516 }
41702fec 517 }
e3cf3d02 518 }
41702fec 519
520 // Prolongate to TPC without update
521 if(!kUPDATE) {
522 AliTRDtrackV1 tt(*seed);
e3cf3d02 523 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
41702fec 524 }
525 }
526 AliInfo(Form("Number of loaded seeds: %d",nseed));
527 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
528
529 return 0;
0906e73e 530}
531
0906e73e 532//____________________________________________________________________
533Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
534{
41702fec 535 // Extrapolates the TRD track in the TPC direction.
536 //
537 // Parameters
538 // t : the TRD track which has to be extrapolated
539 //
540 // Output
541 // number of clusters attached to the track
542 //
543 // Detailed description
544 //
545 // Starting from current radial position of track <t> this function
546 // extrapolates the track through the 6 TRD layers. The following steps
547 // are being performed for each plane:
548 // 1. prepare track:
549 // a. get plane limits in the local x direction
550 // b. check crossing sectors
551 // c. check track inclination
552 // 2. search tracklet in the tracker list (see GetTracklet() for details)
553 // 3. evaluate material budget using the geo manager
554 // 4. propagate and update track using the tracklet information.
555 //
556 // Debug level 2
557 //
558
e3cf3d02 559 Bool_t kStoreIn = kTRUE;
41702fec 560 Int_t nClustersExpected = 0;
e3cf3d02 561 for (Int_t iplane = kNPlanes; iplane--;) {
41702fec 562 Int_t index = 0;
563 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
564 if(!tracklet) continue;
565 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
566
e3cf3d02 567 Double_t x = tracklet->GetX();//GetX0();
41702fec 568 // reject tracklets which are not considered for inward refit
569 if(x > t.GetX()+fgkMaxStep) continue;
570
571 // append tracklet to track
572 t.SetTracklet(tracklet, index);
573
574 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
575 if (!AdjustSector(&t)) break;
576
577 // Start global position
578 Double_t xyz0[3];
579 t.GetXYZ(xyz0);
580
581 // End global position
582 Double_t alpha = t.GetAlpha(), y, z;
583 if (!t.GetProlongation(x,y,z)) break;
584 Double_t xyz1[3];
585 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
586 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
587 xyz1[2] = z;
588
51a23065 589 Double_t length = TMath::Sqrt(
590 (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
591 (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
592 (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
593 );
594 if(length>0.){
595 // Get material budget
596 Double_t param[7];
597 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
598 Double_t xrho= param[0]*param[4];
599 Double_t xx0 = param[1]; // Get mean propagation parameters
600
601 // Propagate and update
602 t.PropagateTo(x, xx0, xrho);
603 if (!AdjustSector(&t)) break;
604 }
e3cf3d02 605 if(kStoreIn){
606 t.SetTrackHigh();
607 kStoreIn = kFALSE;
608 }
609
b72f4eaf 610 Double_t cov[3]; tracklet->GetCovAt(x, cov);
611 Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
612 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
613 if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
41702fec 614 nClustersExpected += tracklet->GetN();
615 }
616 }
617
3a039a31 618 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 619 Int_t index;
51a23065 620 for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
41702fec 621 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
622 if(!tracklet) continue;
623 t.SetTracklet(tracklet, index);
624 }
625
626 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
29f95561 627 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
eb2b4f91 628 AliTRDtrackV1 track(t);
629 track.SetOwner();
41702fec 630 cstreamer << "FollowProlongation"
631 << "EventNumber=" << eventNumber
632 << "ncl=" << nClustersExpected
eb2b4f91 633 << "track.=" << &track
41702fec 634 << "\n";
635 }
636
637 return nClustersExpected;
0906e73e 638
639}
640
641//_____________________________________________________________________________
642Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
643{
afa21247 644// Extrapolates/Build the TRD track in the TOF direction.
645//
646// Parameters
647// t : the TRD track which has to be extrapolated
648//
649// Output
650// number of clusters attached to the track
651//
652// Starting from current radial position of track <t> this function
653// extrapolates the track through the 6 TRD layers. The following steps
654// are being performed for each plane:
655// 1. Propagate track to the entrance of the next chamber:
656// - get chamber limits in the radial direction
657// - check crossing sectors
658// - check track inclination
659// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
660// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
661// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
662// 3. Fit tracklet using the information from the Kalman filter.
663// 4. Propagate and update track at reference radial position of the tracklet.
664// 5. Register tracklet with the tracker and track; update pulls monitoring.
665//
666// Observation
2a3191bb 667// 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
668// - AliTRDtrackV1::kProlongation : track prolongation failed
669// - AliTRDtrackV1::kPropagation : track prolongation failed
670// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
671// - AliTRDtrackV1::kSnp : too large bending
672// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
673// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
674// - AliTRDtrackV1::kUnknown : anything which is not covered before
afa21247 675// 2. By default the status of the track before first TRD update is saved.
676//
677// Debug level 2
678//
679// Author
680// Alexandru Bercuci <A.Bercuci@gsi.de>
681//
41702fec 682
eb2b4f91 683 Int_t n = 0;
684 Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
41702fec 685 AliTRDtrackingChamber *chamber = 0x0;
686
3b57a3f7 687 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 688 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
689 AliTRDseedV1 *tracklets[kNPlanes];
690 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
691 for(Int_t ip = 0; ip < kNPlanes; ip++){
692 tracklets[ip] = t.GetTracklet(ip);
693 t.UnsetTracklet(ip);
694 }
81a6494d 695 Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
e3cf3d02 696
053767a4 697 // Loop through the TRD layers
eb2b4f91 698 TGeoHMatrix *matrix = 0x0;
699 Double_t x, y, z;
700 for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
701 // rough estimate of the entry point
702 if (!t.GetProlongation(fR[ily], y, z)){
703 n=-1;
704 t.SetStatus(AliTRDtrackV1::kProlongation);
705 break;
706 }
41702fec 707
eb2b4f91 708 // find sector / stack / detector
709 sm = t.GetSector();
710 // TODO cross check with y value !
711 stk = fGeom->GetStack(z, ily);
712 det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
713 matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
714
715 // check if supermodule/chamber is installed
716 if( !fGeom->GetSMstatus(sm) ||
717 stk<0. ||
718 fGeom->IsHole(ily, stk, sm) ||
719 !matrix ){
720 // propagate to the default radial position
721 if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
722 n=-1;
723 t.SetStatus(AliTRDtrackV1::kPropagation);
41702fec 724 break;
725 }
eb2b4f91 726 if(!AdjustSector(&t)){
727 n=-1;
728 t.SetStatus(AliTRDtrackV1::kAdjustSector);
729 break;
730 }
731 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
732 n=-1;
733 t.SetStatus(AliTRDtrackV1::kSnp);
734 break;
735 }
736 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
41702fec 737 continue;
738 }
e3cf3d02 739
eb2b4f91 740 // retrieve rotation matrix for the current chamber
741 Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
742 Double_t glb[] = {0., 0., 0.};
743 matrix->LocalToMaster(loc, glb);
744
745 // Propagate to the radial distance of the current layer
746 x = glb[0] - fgkMaxStep;
747 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
748 n=-1;
749 t.SetStatus(AliTRDtrackV1::kPropagation);
750 break;
751 }
752 if(!AdjustSector(&t)){
753 n=-1;
754 t.SetStatus(AliTRDtrackV1::kAdjustSector);
755 break;
756 }
757 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
758 n=-1;
759 t.SetStatus(AliTRDtrackV1::kSnp);
760 break;
761 }
762 Bool_t RECALCULATE = kFALSE;
763 if(sm != t.GetSector()){
764 sm = t.GetSector();
765 RECALCULATE = kTRUE;
766 }
767 if(stk != fGeom->GetStack(z, ily)){
768 stk = fGeom->GetStack(z, ily);
769 RECALCULATE = kTRUE;
770 }
771 if(RECALCULATE){
772 det = AliTRDgeometry::GetDetector(ily, stk, sm);
773 if(!(matrix = fGeom->GetClusterMatrix(det))){
774 t.SetStatus(AliTRDtrackV1::kGeometry, ily);
775 continue;
776 }
777 matrix->LocalToMaster(loc, glb);
778 x = glb[0] - fgkMaxStep;
779 }
780
781 // check if track is well inside fiducial volume
782 if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
783 n=-1;
784 t.SetStatus(AliTRDtrackV1::kProlongation);
785 break;
786 }
787 if(fGeom->IsOnBoundary(det, y, z, .5)){
788 t.SetStatus(AliTRDtrackV1::kBoundary, ily);
789 continue;
790 }
791 // mark track as entering the FIDUCIAL volume of TRD
e3cf3d02 792 if(kStoreIn){
793 t.SetTrackLow();
794 kStoreIn = kFALSE;
795 }
b1957d3c 796
eb2b4f91 797 ptrTracklet = tracklets[ily];
798 if(!ptrTracklet){ // BUILD TRACKLET
799 // check data in supermodule
800 if(!fTrSec[sm].GetNChambers()){
801 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
802 continue;
803 }
804 if(fTrSec[sm].GetX(ily) < 1.){
805 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
806 continue;
807 }
808
809 // check data in chamber
810 if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
811 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
812 continue;
813 }
814 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
815 t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
816 continue;
817 }
818 // build tracklet
819 ptrTracklet = new(&tracklet) AliTRDseedV1(det);
820 ptrTracklet->SetReconstructor(fReconstructor);
821 ptrTracklet->SetKink(t.IsKink());
822 ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
823 ptrTracklet->SetX0(glb[0]+driftLength);
824 if(!tracklet.Init(&t)){
825 n=-1;
826 t.SetStatus(AliTRDtrackV1::kTrackletInit);
827 break;
828 }
829 if(!tracklet.AttachClusters(chamber, kTRUE)){
830 t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
831 continue;
832 }
833 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
834 t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
835 continue;
836 }
837 ptrTracklet->UpdateUsed();
838 }
839
840 // propagate track to the radial position of the tracklet
841 ptrTracklet->UseClusters(); // TODO ? do we need this here ?
842 // fit tracklet no tilt correction
843 if(!ptrTracklet->Fit(kFALSE)){
844 t.SetStatus(AliTRDtrackV1::kNoFit, ily);
845 continue;
846 }
847 x = ptrTracklet->GetX(); //GetX0();
848 if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
849 n=-1;
850 t.SetStatus(AliTRDtrackV1::kPropagation);
851 break;
852 }
853 if(!AdjustSector(&t)) {
854 n=-1;
855 t.SetStatus(AliTRDtrackV1::kAdjustSector);
856 break;
41702fec 857 }
eb2b4f91 858 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
859 n=-1;
860 t.SetStatus(AliTRDtrackV1::kSnp);
861 break;
862 }
863
81a6494d 864 if(kPropagateIn){
865 t.SetTrackLow();
866 kPropagateIn = kFALSE;
867 }
868
eb2b4f91 869 // update Kalman with the TRD measurement
b72f4eaf 870 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
871 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
872 Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
873 if(chi2>1e+10){ // TODO
eb2b4f91 874 t.SetStatus(AliTRDtrackV1::kChi2, ily);
875 continue;
876 }
b72f4eaf 877 if(!t.Update(p, cov, chi2)) {
eb2b4f91 878 n=-1;
879 t.SetStatus(AliTRDtrackV1::kUpdate);
880 break;
881 }
b72f4eaf 882 // fill residuals ?!
883 AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
884
eb2b4f91 885
886 // load tracklet to the tracker
16cca13f 887 ptrTracklet->Update(&t);
eb2b4f91 888 ptrTracklet = SetTracklet(ptrTracklet);
889 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
890 n += ptrTracklet->GetN();
891
41702fec 892 // Reset material budget if 2 consecutive gold
eb2b4f91 893// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 894
895 // Make backup of the track until is gold
896 // TO DO update quality check of the track.
897 // consider comparison with fTimeBinsRange
898 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
899 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
41702fec 900
eb2b4f91 901 if( (chi2 < 18.0) &&
41702fec 902 (ratio0 > 0.8) &&
903 //(ratio1 > 0.6) &&
904 //(ratio0+ratio1 > 1.5) &&
905 (t.GetNCross() == 0) &&
906 (TMath::Abs(t.GetSnp()) < 0.85) &&
e3cf3d02 907 (t.GetNumberOfClusters() > 20)){
908 t.MakeBackupTrack();
909 }
053767a4 910 } // end layers loop
eb2b4f91 911 //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
912 //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
41702fec 913
3a039a31 914 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
29f95561 915 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 916 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
eb2b4f91 917 AliTRDtrackV1 track(t);
918 track.SetOwner();
41702fec 919 cstreamer << "FollowBackProlongation"
eb2b4f91 920 << "EventNumber=" << eventNumber
921 << "ncl=" << n
922 << "track.=" << &track
41702fec 923 << "\n";
924 }
925
eb2b4f91 926 return n;
0906e73e 927}
928
eb38ed55 929//_________________________________________________________________________
930Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 931 //
932 // Fits a Riemann-circle to the given points without tilting pad correction.
933 // The fit is performed using an instance of the class AliRieman (equations
934 // and transformations see documentation of this class)
935 // Afterwards all the tracklets are Updated
936 //
937 // Parameters: - Array of tracklets (AliTRDseedV1)
938 // - Storage for the chi2 values (beginning with direction z)
939 // - Seeding configuration
940 // Output: - The curvature
941 //
942 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
943 fitter->Reset();
944 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
945 Int_t *ppl = &allplanes[0];
946 Int_t maxLayers = 6;
947 if(planes){
948 maxLayers = 4;
949 ppl = planes;
950 }
951 for(Int_t il = 0; il < maxLayers; il++){
952 if(!tracklets[ppl[il]].IsOK()) continue;
e3cf3d02 953 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
41702fec 954 }
955 fitter->Update();
956 // Set the reference position of the fit and calculate the chi2 values
957 memset(chi2, 0, sizeof(Double_t) * 2);
958 for(Int_t il = 0; il < maxLayers; il++){
959 // Reference positions
960 tracklets[ppl[il]].Init(fitter);
961
962 // chi2
963 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
964 chi2[0] += tracklets[ppl[il]].GetChi2Y();
965 chi2[1] += tracklets[ppl[il]].GetChi2Z();
966 }
967 return fitter->GetC();
eb38ed55 968}
969
970//_________________________________________________________________________
971void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
972{
41702fec 973 //
974 // Performs a Riemann helix fit using the seedclusters as spacepoints
975 // Afterwards the chi2 values are calculated and the seeds are updated
976 //
977 // Parameters: - The four seedclusters
978 // - The tracklet array (AliTRDseedV1)
979 // - The seeding configuration
980 // - Chi2 array
981 //
982 // debug level 2
983 //
984 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
985 fitter->Reset();
a3743898 986 for(Int_t i = 0; i < 4; i++){
a3743898 987 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
988 }
41702fec 989 fitter->Update();
990
991
992 // Update the seed and calculated the chi2 value
993 chi2[0] = 0; chi2[1] = 0;
994 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
995 // chi2
996 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
997 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
998 }
eb38ed55 999}
1000
1001
1002//_________________________________________________________________________
1003Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
1004{
41702fec 1005 //
1006 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
1007 // assumed that the vertex position is set to 0.
1008 // This method is very usefull for high-pt particles
1009 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
1010 // x0, y0: Center of the circle
1011 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
1012 // zc: center of the pad row
1013 // Equation which has to be fitted (after transformation):
1014 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
1015 // Transformation:
1016 // t = 1/(x^2 + y^2)
1017 // u = 2 * x * t
1018 // v = 2 * x * tan(phiT) * t
1019 // Parameters in the equation:
1020 // a = -1/y0, b = x0/y0, e = dz/dx
1021 //
1022 // The Curvature is calculated by the following equation:
1023 // - curv = a/Sqrt(b^2 + 1) = 1/R
1024 // Parameters: - the 6 tracklets
1025 // - the Vertex constraint
1026 // Output: - the Chi2 value of the track
1027 //
1028 // debug level 5
1029 //
1030
1031 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
1032 fitter->StoreData(kTRUE);
1033 fitter->ClearPoints();
1034 AliTRDcluster *cl = 0x0;
1035
1036 Float_t x, y, z, w, t, error, tilt;
1037 Double_t uvt[2];
1038 Int_t nPoints = 0;
053767a4 1039 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
1040 if(!tracklets[ilr].IsOK()) continue;
8d2bec9e 1041 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
053767a4 1042 if(!tracklets[ilr].IsUsable(itb)) continue;
1043 cl = tracklets[ilr].GetClusters(itb);
1742f24c 1044 if(!cl->IsInChamber()) continue;
41702fec 1045 x = cl->GetX();
1046 y = cl->GetY();
1047 z = cl->GetZ();
053767a4 1048 tilt = tracklets[ilr].GetTilt();
41702fec 1049 // Transformation
1050 t = 1./(x * x + y * y);
1051 uvt[0] = 2. * x * t;
1052 uvt[1] = 2. * x * t * tilt ;
1053 w = 2. * (y + tilt * (z - zVertex)) * t;
78b7d24c 1054 error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
41702fec 1055 fitter->AddPoint(uvt, w, error);
1056 nPoints++;
1057 }
1058 }
1059 fitter->Eval();
1060
1061 // Calculate curvature
1062 Double_t a = fitter->GetParameter(0);
1063 Double_t b = fitter->GetParameter(1);
1064 Double_t curvature = a/TMath::Sqrt(b*b + 1);
1065
1066 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1067 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
e3cf3d02 1068 tracklets[ip].SetC(curvature);
41702fec 1069
3a039a31 1070/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 1071 //Linear Model on z-direction
1072 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
1073 Double_t slope = fitter->GetParameter(2);
1074 Double_t zref = slope * xref;
1075 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
1076 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1077 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 1078 TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1079 treeStreamer << "FitTiltedRiemanConstraint"
1080 << "EventNumber=" << eventNumber
1081 << "CandidateNumber=" << candidateNumber
1082 << "Curvature=" << curvature
1083 << "Chi2Track=" << chi2track
1084 << "Chi2Z=" << chi2Z
1085 << "zref=" << zref
1086 << "\n";
3a039a31 1087 }*/
41702fec 1088 return chi2track;
eb38ed55 1089}
1090
1091//_________________________________________________________________________
1092Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
1093{
41702fec 1094 //
1095 // Performs a Riemann fit taking tilting pad correction into account
1096 // The equation of a Riemann circle, where the y position is substituted by the
1097 // measured y-position taking pad tilting into account, has to be transformed
1098 // into a 4-dimensional hyperplane equation
1099 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1100 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1101 // zc: center of the pad row
1102 // zt: z-position of the track
1103 // The z-position of the track is assumed to be linear dependent on the x-position
1104 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1105 // Transformation: u = 2 * x * t
1106 // v = 2 * tan(phiT) * t
1107 // w = 2 * tan(phiT) * (x - xref) * t
1108 // t = 1 / (x^2 + ymeas^2)
1109 // Parameters: a = -1/y0
1110 // b = x0/y0
1111 // c = (R^2 -x0^2 - y0^2)/y0
1112 // d = offset
1113 // e = dz/dx
1114 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1115 // results from the simple riemann fit. Afterwards the fit is redone.
1116 // The curvature is calculated according to the formula:
1117 // curv = a/(1 + b^2 + c*a) = 1/R
1118 //
1119 // Paramters: - Array of tracklets (connected to the track candidate)
1120 // - Flag selecting the error definition
1121 // Output: - Chi2 values of the track (in Parameter list)
1122 //
1123 TLinearFitter *fitter = GetTiltedRiemanFitter();
1124 fitter->StoreData(kTRUE);
1125 fitter->ClearPoints();
1126 AliTRDLeastSquare zfitter;
1127 AliTRDcluster *cl = 0x0;
1128
1129 Double_t xref = CalculateReferenceX(tracklets);
1130 Double_t x, y, z, t, tilt, dx, w, we;
1131 Double_t uvt[4];
1132 Int_t nPoints = 0;
1133 // Containers for Least-square fitter
1134 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1135 if(!tracklets[ipl].IsOK()) continue;
ed15ef4f 1136 tilt = tracklets[ipl].GetTilt();
8d2bec9e 1137 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1138 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1742f24c 1139 if(!cl->IsInChamber()) continue;
41702fec 1140 if (!tracklets[ipl].IsUsable(itb)) continue;
1141 x = cl->GetX();
1142 y = cl->GetY();
1143 z = cl->GetZ();
41702fec 1144 dx = x - xref;
1145 // Transformation
1146 t = 1./(x*x + y*y);
1147 uvt[0] = 2. * x * t;
1148 uvt[1] = t;
1149 uvt[2] = 2. * tilt * t;
1150 uvt[3] = 2. * tilt * dx * t;
1151 w = 2. * (y + tilt*z) * t;
1152 // error definition changes for the different calls
1153 we = 2. * t;
78b7d24c 1154 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
41702fec 1155 fitter->AddPoint(uvt, w, we);
1156 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1157 nPoints++;
1158 }
1159 }
1160 fitter->Eval();
1161 zfitter.Eval();
1162
1163 Double_t offset = fitter->GetParameter(3);
1164 Double_t slope = fitter->GetParameter(4);
1165
1166 // Linear fitter - not possible to make boundaries
1167 // Do not accept non possible z and dzdx combinations
1168 Bool_t acceptablez = kTRUE;
1169 Double_t zref = 0.0;
1170 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1171 if(!tracklets[iLayer].IsOK()) continue;
1172 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1173 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
41702fec 1174 acceptablez = kFALSE;
1175 }
1176 if (!acceptablez) {
1177 Double_t dzmf = zfitter.GetFunctionParameter(1);
1178 Double_t zmf = zfitter.GetFunctionValue(&xref);
1179 fgTiltedRieman->FixParameter(3, zmf);
1180 fgTiltedRieman->FixParameter(4, dzmf);
1181 fitter->Eval();
1182 fitter->ReleaseParameter(3);
1183 fitter->ReleaseParameter(4);
1184 offset = fitter->GetParameter(3);
1185 slope = fitter->GetParameter(4);
1186 }
1187
1188 // Calculate Curvarture
1189 Double_t a = fitter->GetParameter(0);
1190 Double_t b = fitter->GetParameter(1);
1191 Double_t c = fitter->GetParameter(2);
1192 Double_t curvature = 1.0 + b*b - c*a;
1193 if (curvature > 0.0)
1194 curvature = a / TMath::Sqrt(curvature);
1195
1196 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1197
1198 // Update the tracklets
1199 Double_t dy, dz;
1200 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1201
1202 x = tracklets[iLayer].GetX0();
1203 y = 0;
1204 z = 0;
1205 dy = 0;
1206 dz = 0;
1207
1208 // y: R^2 = (x - x0)^2 + (y - y0)^2
1209 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1210 // R = Sqrt() = 1/Curvature
1211 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1212 Double_t res = (x * a + b); // = (x - x0)/y0
1213 res *= res;
1214 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1215 if (res >= 0) {
1216 res = TMath::Sqrt(res);
1217 y = (1.0 - res) / a;
1218 }
1219
1220 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1221 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1222 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1223 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1224 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1225 Double_t x0 = -b / a;
1226 if (-c * a + b * b + 1 > 0) {
1227 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1228 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1229 if (a < 0) yderiv *= -1.0;
1230 dy = yderiv;
1231 }
1232 }
1233 z = offset + slope * (x - xref);
1234 dz = slope;
1235 tracklets[iLayer].SetYref(0, y);
1236 tracklets[iLayer].SetYref(1, dy);
1237 tracklets[iLayer].SetZref(0, z);
1238 tracklets[iLayer].SetZref(1, dz);
1239 tracklets[iLayer].SetC(curvature);
1240 tracklets[iLayer].SetChi2(chi2track);
1241 }
1242
3a039a31 1243/* if(fReconstructor->GetStreamLevel() >=5){
29f95561 1244 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 1245 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1246 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1247 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1248 cstreamer << "FitTiltedRieman0"
1249 << "EventNumber=" << eventNumber
1250 << "CandidateNumber=" << candidateNumber
1251 << "xref=" << xref
1252 << "Chi2Z=" << chi2z
1253 << "\n";
3a039a31 1254 }*/
41702fec 1255 return chi2track;
eb38ed55 1256}
1257
3b57a3f7 1258
9e333711 1259//____________________________________________________________________
6e4d4425 1260Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
9e333711 1261{
1262 AliTRDLeastSquare yfitter, zfitter;
1263 AliTRDcluster *cl = 0x0;
1264
1265 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1266 if(!tracklets){
1267 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1268 if(!(tracklet = track->GetTracklet(ipl))) continue;
1269 if(!tracklet->IsOK()) continue;
1270 new(&work[ipl]) AliTRDseedV1(*tracklet);
1271 }
1272 tracklets = &work[0];
1273 }
1274
1275 Double_t xref = CalculateReferenceX(tracklets);
1276 Double_t x, y, z, dx, ye, yr, tilt;
1277 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1278 if(!tracklets[ipl].IsOK()) continue;
1279 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1280 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1281 if (!tracklets[ipl].IsUsable(itb)) continue;
1282 x = cl->GetX();
1283 z = cl->GetZ();
1284 dx = x - xref;
1285 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1286 }
1287 }
1288 zfitter.Eval();
1289 Double_t z0 = zfitter.GetFunctionParameter(0);
1290 Double_t dzdx = zfitter.GetFunctionParameter(1);
1291 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1292 if(!tracklets[ipl].IsOK()) continue;
1293 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1294 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1295 if (!tracklets[ipl].IsUsable(itb)) continue;
1296 x = cl->GetX();
1297 y = cl->GetY();
1298 z = cl->GetZ();
1299 tilt = tracklets[ipl].GetTilt();
1300 dx = x - xref;
1301 yr = y + tilt*(z - z0 - dzdx*dx);
1302 // error definition changes for the different calls
1303 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1304 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1305 yfitter.AddPoint(&dx, yr, ye);
1306 }
1307 }
1308 yfitter.Eval();
1309 Double_t y0 = yfitter.GetFunctionParameter(0);
1310 Double_t dydx = yfitter.GetFunctionParameter(1);
1311 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1312
1313 //update track points array
1314 if(np && points){
1315 Float_t xyz[3];
1316 for(int ip=0; ip<np; ip++){
1317 points[ip].GetXYZ(xyz);
1318 xyz[1] = y0 + dydx * (xyz[0] - xref);
1319 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1320 points[ip].SetXYZ(xyz);
1321 }
1322 }
1323 return chi2;
1324}
1325
1326
3b57a3f7 1327//_________________________________________________________________________
6e4d4425 1328Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
3b57a3f7 1329{
0fa1a8ee 1330//
1331// Performs a Riemann fit taking tilting pad correction into account
1332//
1333// Paramters: - Array of tracklets (connected to the track candidate)
1334// - Flag selecting the error definition
1335// Output: - Chi2 values of the track (in Parameter list)
1336//
1337// The equations which has to be solved simultaneously are:
1338// BEGIN_LATEX
1339// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
1340// y^{*} = y - tg(h)(z - z_{t})
1341// z_{t} = z_{0}+dzdx*(x-x_{r})
1342// END_LATEX
1343// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
1344// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
1345// track in the x-z plane. Using the following transformations
1346// BEGIN_LATEX
1347// t = 1 / (x^{2} + y^{2})
1348// u = 2 * x * t
1349// v = 2 * tan(h) * t
1350// w = 2 * tan(h) * (x - x_{r}) * t
1351// END_LATEX
1352// One gets the following linear equation
1353// BEGIN_LATEX
1354// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
1355// END_LATEX
1356// where the coefficients have the following meaning
1357// BEGIN_LATEX
1358// a = -1/y_{0}
1359// b = x_{0}/y_{0}
1360// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
1361// d = z_{0}
1362// e = dz/dx
1363// END_LATEX
1364// The error calculation for the free term is thus
1365// BEGIN_LATEX
1366// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
1367// END_LATEX
1368//
1369// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
1370// to the formula:
1371// BEGIN_LATEX
1372// C = 1/R = a/(1 + b^{2} + c*a)
1373// END_LATEX
1374//
1375// Authors
1376// M.Ivanov <M.Ivanov@gsi.de>
1377// A.Bercuci <A.Bercuci@gsi.de>
1378// M.Fasel <M.Fasel@gsi.de>
1379
41702fec 1380 TLinearFitter *fitter = GetTiltedRiemanFitter();
1381 fitter->StoreData(kTRUE);
1382 fitter->ClearPoints();
1383 AliTRDLeastSquare zfitter;
1384 AliTRDcluster *cl = 0x0;
3b57a3f7 1385
1386 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1387 if(!tracklets){
1388 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1389 if(!(tracklet = track->GetTracklet(ipl))) continue;
1390 if(!tracklet->IsOK()) continue;
1391 new(&work[ipl]) AliTRDseedV1(*tracklet);
1392 }
1393 tracklets = &work[0];
1394 }
1395
41702fec 1396 Double_t xref = CalculateReferenceX(tracklets);
1397 Double_t x, y, z, t, tilt, dx, w, we;
1398 Double_t uvt[4];
1399 Int_t nPoints = 0;
1400 // Containers for Least-square fitter
1401 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1402 if(!tracklets[ipl].IsOK()) continue;
8d2bec9e 1403 for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
41702fec 1404 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1405 if (!tracklets[ipl].IsUsable(itb)) continue;
1406 x = cl->GetX();
1407 y = cl->GetY();
1408 z = cl->GetZ();
1409 tilt = tracklets[ipl].GetTilt();
1410 dx = x - xref;
1411 // Transformation
1412 t = 1./(x*x + y*y);
1413 uvt[0] = 2. * x * t;
1414 uvt[1] = t;
1415 uvt[2] = 2. * tilt * t;
1416 uvt[3] = 2. * tilt * dx * t;
1417 w = 2. * (y + tilt*z) * t;
1418 // error definition changes for the different calls
1419 we = 2. * t;
f29f13a6 1420 we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
41702fec 1421 fitter->AddPoint(uvt, w, we);
1422 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1423 nPoints++;
1424 }
1425 }
aec26713 1426 if(fitter->Eval()) return 1.E10;
1427
41702fec 1428 Double_t z0 = fitter->GetParameter(3);
1429 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1430
1431
1432 // Linear fitter - not possible to make boundaries
1433 // Do not accept non possible z and dzdx combinations
1434 Bool_t accept = kTRUE;
1435 Double_t zref = 0.0;
1436 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1437 if(!tracklets[iLayer].IsOK()) continue;
1438 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1439 if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
3b57a3f7 1440 accept = kFALSE;
1441 }
1442 if (!accept) {
41702fec 1443 zfitter.Eval();
3b57a3f7 1444 Double_t dzmf = zfitter.GetFunctionParameter(1);
1445 Double_t zmf = zfitter.GetFunctionValue(&xref);
1446 fitter->FixParameter(3, zmf);
1447 fitter->FixParameter(4, dzmf);
1448 fitter->Eval();
1449 fitter->ReleaseParameter(3);
1450 fitter->ReleaseParameter(4);
1451 z0 = fitter->GetParameter(3); // = zmf ?
1452 dzdx = fitter->GetParameter(4); // = dzmf ?
1453 }
1454
1455 // Calculate Curvature
1456 Double_t a = fitter->GetParameter(0);
1457 Double_t b = fitter->GetParameter(1);
1458 Double_t c = fitter->GetParameter(2);
1459 Double_t y0 = 1. / a;
1460 Double_t x0 = -b * y0;
a015e406 1461 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1462 if(tmp<=0.) return 1.E10;
1463 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1464 Double_t C = 1.0 + b*b - c*a;
1465 if (C > 0.0) C = a / TMath::Sqrt(C);
1466
1467 // Calculate chi2 of the fit
1468 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1469
1470 // Update the tracklets
1471 if(!track){
1472 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1473 x = tracklets[ip].GetX0();
90cf7133 1474 tmp = R*R-(x-x0)*(x-x0);
a015e406 1475 if(tmp <= 0.) continue;
1476 tmp = TMath::Sqrt(tmp);
3b57a3f7 1477
1478 // y: R^2 = (x - x0)^2 + (y - y0)^2
1479 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1480 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1481 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1482 tracklets[ip].SetYref(1, (x - x0) / tmp);
1483 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1484 tracklets[ip].SetZref(1, dzdx);
1485 tracklets[ip].SetC(C);
1486 tracklets[ip].SetChi2(chi2);
1487 }
1488 }
3b57a3f7 1489 //update track points array
1490 if(np && points){
1491 Float_t xyz[3];
1492 for(int ip=0; ip<np; ip++){
1493 points[ip].GetXYZ(xyz);
60e55aee 1494 xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
3b57a3f7 1495 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1496 points[ip].SetXYZ(xyz);
1497 }
1498 }
1499
3b57a3f7 1500 return chi2;
1501}
1502
1503
1bf51039 1504//____________________________________________________________________
1505Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1506{
1507// Kalman filter implementation for the TRD.
1508// It returns the positions of the fit in the array "points"
1509//
1510// Author : A.Bercuci@gsi.de
1511
3cfaffa4 1512 // printf("Start track @ x[%f]\n", track->GetX());
1bf51039 1513
1514 //prepare marker points along the track
1515 Int_t ip = np ? 0 : 1;
1516 while(ip<np){
1517 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1518 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1519 ip++;
1520 }
1521 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1522
1523
1524 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1525
1526 //Loop through the TRD planes
1527 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1528 // GET TRACKLET OR BUILT IT
1529 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1530 if(tracklets){
1531 if(!(ptrTracklet = &tracklets[iplane])) continue;
1532 }else{
1533 if(!(ptrTracklet = track->GetTracklet(iplane))){
1534 /*AliTRDtrackerV1 *tracker = 0x0;
1535 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1536 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1537 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1538 continue;
1539 }
1540 }
1541 if(!ptrTracklet->IsOK()) continue;
1542
1543 Double_t x = ptrTracklet->GetX0();
1544
1545 while(ip < np){
1546 //don't do anything if next marker is after next update point.
1547 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1bf51039 1548 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1549
1550 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1551 track->GetXYZ(xyz);
1552 track->Global2LocalPosition(xyz, track->GetAlpha());
1553 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1554 ip++;
1555 }
3cfaffa4 1556 // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1bf51039 1557
3cfaffa4 1558 // Propagate closer to the next update point
1bf51039 1559 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1560
1561 if(!AdjustSector(track)) return -1;
1562 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1563
1564 //load tracklet to the tracker and the track
1565/* Int_t index;
1566 if((index = FindTracklet(ptrTracklet)) < 0){
1567 ptrTracklet = SetTracklet(&tracklet);
1568 index = fTracklets->GetEntriesFast()-1;
1569 }
1570 track->SetTracklet(ptrTracklet, index);*/
1571
1572
1573 // register tracklet to track with tracklet creation !!
1574 // PropagateBack : loaded tracklet to the tracker and update index
1575 // RefitInward : update index
1576 // MakeTrack : loaded tracklet to the tracker and update index
1577 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1578
1579
1580 //Calculate the mean material budget along the path inside the chamber
1581 Double_t xyz0[3]; track->GetXYZ(xyz0);
1582 Double_t alpha = track->GetAlpha();
1583 Double_t xyz1[3], y, z;
1584 if(!track->GetProlongation(x, y, z)) return -1;
1585 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1586 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1587 xyz1[2] = z;
3cfaffa4 1588 if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
1bf51039 1589 Double_t param[7];
3cfaffa4 1590 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
1bf51039 1591 Double_t xrho = param[0]*param[4]; // density*length
1592 Double_t xx0 = param[1]; // radiation length
1593
1594 //Propagate the track
1595 track->PropagateTo(x, xx0, xrho);
1596 if (!AdjustSector(track)) break;
1597
1598 //Update track
b72f4eaf 1599 Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
1600 Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
1601 Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
1602 if(chi2<1e+10) track->Update(p, cov, chi2);
1bf51039 1603 if(!up) continue;
1604
1605 //Reset material budget if 2 consecutive gold
1606 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1607 } // end planes loop
1608
1609 // extrapolation
1610 while(ip < np){
1611 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1612
1613 Double_t xyz[3]; // should also get the covariance
3cfaffa4 1614 track->GetXYZ(xyz);
1615 track->Global2LocalPosition(xyz, track->GetAlpha());
1616 points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1bf51039 1617 ip++;
1618 }
1619
1620 return track->GetChi2();
1621}
3b57a3f7 1622
eb38ed55 1623//_________________________________________________________________________
bb56afff 1624Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1625{
41702fec 1626 //
1627 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1628 // A linear dependence on the x-value serves as a model.
1629 // The parameters are related to the tilted Riemann fit.
1630 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1631 // - the offset for the reference x
1632 // - the slope
1633 // - the reference x position
1634 // Output: - The Chi2 value of the track in z-Direction
1635 //
1636 Float_t chi2Z = 0, nLayers = 0;
053767a4 1637 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1638 if(!tracklets[iLayer].IsOK()) continue;
1639 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
e3cf3d02 1640 chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
41702fec 1641 nLayers++;
1642 }
1643 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1644 return chi2Z;
eb38ed55 1645}
1646
bccda319 1647//_____________________________________________________________________________
1648Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1649{
41702fec 1650 //
1651 // Starting from current X-position of track <t> this function
1652 // extrapolates the track up to radial position <xToGo>.
1653 // Returns 1 if track reaches the plane, and 0 otherwise
1654 //
bccda319 1655
41702fec 1656 const Double_t kEpsilon = 0.00001;
bccda319 1657
41702fec 1658 // Current track X-position
1659 Double_t xpos = t.GetX();
bccda319 1660
41702fec 1661 // Direction: inward or outward
1662 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1663
41702fec 1664 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1665
41702fec 1666 Double_t xyz0[3];
1667 Double_t xyz1[3];
1668 Double_t param[7];
1669 Double_t x;
1670 Double_t y;
1671 Double_t z;
bccda319 1672
41702fec 1673 // The next step size
1674 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1675
41702fec 1676 // Get the global position of the starting point
1677 t.GetXYZ(xyz0);
bccda319 1678
41702fec 1679 // X-position after next step
1680 x = xpos + step;
bccda319 1681
41702fec 1682 // Get local Y and Z at the X-position of the next step
3352b455 1683 if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
bccda319 1684
41702fec 1685 // The global position of the end point of this prolongation step
1686 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1687 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1688 xyz1[2] = z;
bccda319 1689
41702fec 1690 // Calculate the mean material budget between start and
1691 // end point of this prolongation step
83dea92e 1692 if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
bccda319 1693
41702fec 1694 // Propagate the track to the X-position after the next step
9c87a076 1695 if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
bccda319 1696
41702fec 1697 // Rotate the track if necessary
1698 AdjustSector(&t);
bccda319 1699
41702fec 1700 // New track X-position
1701 xpos = t.GetX();
bccda319 1702
41702fec 1703 }
bccda319 1704
41702fec 1705 return 1;
bccda319 1706
1707}
1708
eb38ed55 1709
1710//_____________________________________________________________________________
1711Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1712{
41702fec 1713 //
1714 // Reads AliTRDclusters from the file.
1715 // The names of the cluster tree and branches
1716 // should match the ones used in AliTRDclusterizer::WriteClusters()
1717 //
1718
1719 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1720 TObjArray *clusterArray = new TObjArray(nsize+1000);
1721
1722 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1723 if (!branch) {
1724 AliError("Can't get the branch !");
1725 return 1;
1726 }
1727 branch->SetAddress(&clusterArray);
1728
1729 if(!fClusters){
8ae98148 1730 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1731 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1732 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1733 array->SetOwner(kTRUE);
1734 }
1735
1736 // Loop through all entries in the tree
1737 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1738 Int_t nbytes = 0;
1739 Int_t ncl = 0;
1740 AliTRDcluster *c = 0x0;
1741 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1742 // Import the tree
1743 nbytes += clusterTree->GetEvent(iEntry);
1744
1745 // Get the number of points in the detector
1746 Int_t nCluster = clusterArray->GetEntriesFast();
1747 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1748 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
41702fec 1749 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1750 delete (clusterArray->RemoveAt(iCluster));
1751 }
1752
1753 }
1754 delete clusterArray;
1755
1756 return 0;
eb38ed55 1757}
1758
1759//_____________________________________________________________________________
1760Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1761{
41702fec 1762 //
66f6bfd9 1763 // Fills clusters into TRD tracking sectors
41702fec 1764 //
41702fec 1765
48f8adf3 1766 if(!fReconstructor->IsWritingClusters()){
1767 fClusters = AliTRDReconstructor::GetClusters();
1768 } else {
66f6bfd9 1769 if (ReadClusters(fClusters, cTree)) {
1770 AliError("Problem with reading the clusters !");
1771 return 1;
1772 }
1773 }
1774 SetClustersOwner();
1775
48f8adf3 1776 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1777 AliInfo("No TRD clusters");
41702fec 1778 return 1;
1779 }
66f6bfd9 1780
1781 //Int_t nin =
1782 BuildTrackingContainers();
1783
1784 //Int_t ncl = fClusters->GetEntriesFast();
1785 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1786
1787 return 0;
1788}
1789
1790//_____________________________________________________________________________
1791Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1792{
1793 //
1794 // Fills clusters into TRD tracking sectors
1795 // Function for use in the HLT
1796
1797 if(!clusters || !clusters->GetEntriesFast()){
1798 AliInfo("No TRD clusters");
41702fec 1799 return 1;
1800 }
1801
66f6bfd9 1802 fClusters = clusters;
1803 SetClustersOwner();
1804
1805 //Int_t nin =
1806 BuildTrackingContainers();
1807
1808 //Int_t ncl = fClusters->GetEntriesFast();
1809 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1810
1811 return 0;
1812}
1813
1814
1815//____________________________________________________________________
1816Int_t AliTRDtrackerV1::BuildTrackingContainers()
1817{
1818// Building tracking containers for clusters
1819
1820 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1821 while (icl--) {
1822 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1823 if(c->IsInChamber()) nin++;
1824 Int_t detector = c->GetDetector();
1825 Int_t sector = fGeom->GetSector(detector);
053767a4 1826 Int_t stack = fGeom->GetStack(detector);
1827 Int_t layer = fGeom->GetLayer(detector);
41702fec 1828
053767a4 1829 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1830 }
b0a48c4d 1831
1832 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1833 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1834 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1835 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1836 }
66f6bfd9 1837
1838 return nin;
eb38ed55 1839}
1840
1841
66f6bfd9 1842
0906e73e 1843//____________________________________________________________________
172b6f82 1844void AliTRDtrackerV1::UnloadClusters()
0906e73e 1845{
d4cf71ca 1846//
1847// Clears the arrays of clusters and tracks. Resets sectors and timebins
1848// If option "force" is also set the containers are also deleted. This is useful
1849// in case of HLT
1850
1851 if(fTracks){
1852 fTracks->Delete();
172b6f82 1853 if(HasRemoveContainers()){delete fTracks; fTracks = 0x0;}
d4cf71ca 1854 }
1855 if(fTracklets){
1856 fTracklets->Delete();
172b6f82 1857 if(HasRemoveContainers()){delete fTracklets; fTracklets = 0x0;}
d4cf71ca 1858 }
48f8adf3 1859 if(fClusters){
1860 if(IsClustersOwner()) fClusters->Delete();
1861
1862 // save clusters array in the reconstructor for further use.
1863 if(!fReconstructor->IsWritingClusters()){
1864 AliTRDReconstructor::SetClusters(fClusters);
1865 SetClustersOwner(kFALSE);
1866 } else AliTRDReconstructor::SetClusters(0x0);
1867 }
0906e73e 1868
053767a4 1869 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1870
41702fec 1871 // Increment the Event Number
1872 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1873}
0906e73e 1874
fac58f00 1875// //____________________________________________________________________
1876// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
1877// {
1878// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
1879// if(!track) return;
1880//
1881// AliTRDseedV1 *tracklet = 0x0;
1882// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
1883// if(!(tracklet = track->GetTracklet(ily))) continue;
1884// AliTRDcluster *c = 0x0;
8d2bec9e 1885// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
fac58f00 1886// if(!(c=tracklet->GetClusters(ic))) continue;
1887// c->Use();
1888// }
1889// }
1890// }
1891//
b1957d3c 1892
eb38ed55 1893//_____________________________________________________________________________
1894Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1895{
41702fec 1896 //
1897 // Rotates the track when necessary
1898 //
1899
1900 Double_t alpha = AliTRDgeometry::GetAlpha();
1901 Double_t y = track->GetY();
1902 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
3cfaffa4 1903
41702fec 1904 if (y > ymax) {
1905 if (!track->Rotate( alpha)) {
1906 return kFALSE;
1907 }
1908 }
1909 else if (y < -ymax) {
1910 if (!track->Rotate(-alpha)) {
1911 return kFALSE;
1912 }
1913 }
1914
1915 return kTRUE;
0906e73e 1916
1917}
1918
eb38ed55 1919
0906e73e 1920//____________________________________________________________________
1921AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1922{
41702fec 1923 // Find tracklet for TRD track <track>
1924 // Parameters
1925 // - track
1926 // - sector
1927 // - plane
1928 // - index
1929 // Output
1930 // tracklet
1931 // index
1932 // Detailed description
1933 //
1934 idx = track->GetTrackletIndex(p);
1935 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1936
1937 return tracklet;
0906e73e 1938}
1939
1940//____________________________________________________________________
3b57a3f7 1941AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1942{
41702fec 1943 // Add this tracklet to the list of tracklets stored in the tracker
1944 //
1945 // Parameters
1946 // - tracklet : pointer to the tracklet to be added to the list
1947 //
1948 // Output
1949 // - the index of the new tracklet in the tracker tracklets list
1950 //
1951 // Detailed description
1952 // Build the tracklets list if it is not yet created (late initialization)
1953 // and adds the new tracklet to the list.
1954 //
1955 if(!fTracklets){
053767a4 1956 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1957 fTracklets->SetOwner(kTRUE);
1958 }
1959 Int_t nentries = fTracklets->GetEntriesFast();
1960 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1961}
1962
d20df6fc 1963//____________________________________________________________________
1964AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1965{
1966 // Add this track to the list of tracks stored in the tracker
1967 //
1968 // Parameters
1969 // - track : pointer to the track to be added to the list
1970 //
1971 // Output
1972 // - the pointer added
1973 //
1974 // Detailed description
1975 // Build the tracks list if it is not yet created (late initialization)
1976 // and adds the new track to the list.
1977 //
1978 if(!fTracks){
053767a4 1979 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1980 fTracks->SetOwner(kTRUE);
1981 }
1982 Int_t nentries = fTracks->GetEntriesFast();
1983 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1984}
1985
1986
0906e73e 1987
e4f2f73d 1988//____________________________________________________________________
eb38ed55 1989Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1990{
41702fec 1991 //
1992 // Steer tracking for one SM.
1993 //
1994 // Parameters :
1995 // sector : Array of (SM) propagation layers containing clusters
1996 // esd : The current ESD event. On output it contains the also
1997 // the ESD (TRD) tracks found in this SM.
1998 //
1999 // Output :
2000 // Number of tracks found in this TRD supermodule.
2001 //
2002 // Detailed description
2003 //
2004 // 1. Unpack AliTRDpropagationLayers objects for each stack.
2005 // 2. Launch stack tracking.
2006 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
2007 // 3. Pack results in the ESD event.
2008 //
2009
2010 // allocate space for esd tracks in this SM
2011 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
2012 esdTrackList.SetOwner();
2013
2014 Int_t nTracks = 0;
2015 Int_t nChambers = 0;
2016 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 2017 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 2018 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
2019 nChambers = 0;
053767a4 2020 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
2021 if(!(chamber = stack[ilayer])) continue;
3a039a31 2022 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 2023 nChambers++;
053767a4 2024 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 2025 }
2026 if(nChambers < 4) continue;
2027 //AliInfo(Form("Doing stack %d", istack));
2028 nTracks += Clusters2TracksStack(stack, &esdTrackList);
2029 }
2030 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
2031
2032 for(int itrack=0; itrack<nTracks; itrack++)
2033 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
2034
2035 // Reset Track and Candidate Number
2036 AliTRDtrackerDebug::SetCandidateNumber(0);
2037 AliTRDtrackerDebug::SetTrackNumber(0);
2038 return nTracks;
e4f2f73d 2039}
2040
2041//____________________________________________________________________
eb38ed55 2042Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 2043{
41702fec 2044 //
2045 // Make tracks in one TRD stack.
2046 //
2047 // Parameters :
2048 // layer : Array of stack propagation layers containing clusters
2049 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
2050 // On exit the tracks found in this stack are appended.
2051 //
2052 // Output :
2053 // Number of tracks found in this stack.
2054 //
2055 // Detailed description
2056 //
2057 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
2058 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
2059 // See AliTRDtrackerV1::MakeSeeds() for more details.
2060 // 3. Arrange track candidates in decreasing order of their quality
2061 // 4. Classify tracks in 5 categories according to:
2062 // a) number of layers crossed
2063 // b) track quality
2064 // 5. Sign clusters by tracks in decreasing order of track quality
2065 // 6. Build AliTRDtrack out of seeding tracklets
2066 // 7. Cook MC label
2067 // 8. Build ESD track and register it to the output list
2068 //
2069
b0a48c4d 2070 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 2071 AliTRDtrackingChamber *chamber = 0x0;
fac58f00 2072 AliTRDtrackingChamber **ci = 0x0;
41702fec 2073 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
2074 Int_t pars[4]; // MakeSeeds parameters
2075
2076 //Double_t alpha = AliTRDgeometry::GetAlpha();
2077 //Double_t shift = .5 * alpha;
2078 Int_t configs[kNConfigs];
2079
fac58f00 2080 // Purge used clusters from the containers
2081 ci = &stack[0];
2082 for(Int_t ic = kNPlanes; ic--; ci++){
2083 if(!(*ci)) continue;
2084 (*ci)->Update();
2085 }
2086
41702fec 2087 // Build initial seeding configurations
2088 Double_t quality = BuildSeedingConfigs(stack, configs);
eb2b4f91 2089 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2090 AliInfo(Form("Plane config %d %d %d Quality %f"
2091 , configs[0], configs[1], configs[2], quality));
2092 }
d931f2aa 2093
41702fec 2094
2095 // Initialize contors
2096 Int_t ntracks, // number of TRD track candidates
2097 ntracks1, // number of registered TRD tracks/iter
2098 ntracks2 = 0; // number of all registered TRD tracks in stack
2099 fSieveSeeding = 0;
d931f2aa 2100
2101 // Get stack index
fac58f00 2102 Int_t ic = 0; ci = &stack[0];
2103 while(ic<kNPlanes && !(*ci)){ic++; ci++;}
2104 if(!(*ci)) return ntracks2;
2105 Int_t istack = fGeom->GetStack((*ci)->GetDetector());
d931f2aa 2106
41702fec 2107 do{
2108 // Loop over seeding configurations
2109 ntracks = 0; ntracks1 = 0;
2110 for (Int_t iconf = 0; iconf<3; iconf++) {
2111 pars[0] = configs[iconf];
2112 pars[1] = ntracks;
d931f2aa 2113 pars[2] = istack;
41702fec 2114 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
2115 if(ntracks == kMaxTracksStack) break;
2116 }
eb2b4f91 2117 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 2118
2119 if(!ntracks) break;
2120
2121 // Sort the seeds according to their quality
2122 Int_t sort[kMaxTracksStack];
2123 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
2124
2125 // Initialize number of tracks so far and logic switches
2126 Int_t ntracks0 = esdTrackList->GetEntriesFast();
2127 Bool_t signedTrack[kMaxTracksStack];
2128 Bool_t fakeTrack[kMaxTracksStack];
2129 for (Int_t i=0; i<ntracks; i++){
2130 signedTrack[i] = kFALSE;
2131 fakeTrack[i] = kFALSE;
2132 }
2133 //AliInfo("Selecting track candidates ...");
2134
2135 // Sieve clusters in decreasing order of track quality
2136 Double_t trackParams[7];
2137 // AliTRDseedV1 *lseed = 0x0;
2138 Int_t jSieve = 0, candidates;
2139 do{
2140 //AliInfo(Form("\t\tITER = %i ", jSieve));
2141
2142 // Check track candidates
2143 candidates = 0;
2144 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 2145 Int_t trackIndex = sort[itrack];
2146 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 2147
2148
804bb02e 2149 // Calculate track parameters from tracklets seeds
804bb02e 2150 Int_t ncl = 0;
2151 Int_t nused = 0;
2152 Int_t nlayers = 0;
2153 Int_t findable = 0;
2154 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
2155 Int_t jseed = kNPlanes*trackIndex+jLayer;
2156 if(!sseed[jseed].IsOK()) continue;
f29f13a6 2157 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
eede7907 2158 // TODO here we get a sig fault which should never happen !
804bb02e 2159 sseed[jseed].UpdateUsed();
2160 ncl += sseed[jseed].GetN2();
2161 nused += sseed[jseed].GetNUsed();
2162 nlayers++;
804bb02e 2163 }
2164
f29f13a6 2165 // Filter duplicated tracks
2166 if (nused > 30){
2167 //printf("Skip %d nused %d\n", trackIndex, nused);
2168 fakeTrack[trackIndex] = kTRUE;
2169 continue;
2170 }
2171 if (Float_t(nused)/ncl >= .25){
2172 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
2173 fakeTrack[trackIndex] = kTRUE;
2174 continue;
2175 }
41702fec 2176
f29f13a6 2177 // Classify tracks
2178 Bool_t skip = kFALSE;
2179 switch(jSieve){
2180 case 0:
2181 if(nlayers < 6) {skip = kTRUE; break;}
2182 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2183 break;
2184
2185 case 1:
2186 if(nlayers < findable){skip = kTRUE; break;}
2187 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
2188 break;
2189
2190 case 2:
2191 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
2192 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
2193 break;
2194
2195 case 3:
2196 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
2197 break;
2198
2199 case 4:
2200 if (nlayers == 3){skip = kTRUE; break;}
2201 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
2202 break;
2203 }
2204 if(skip){
2205 candidates++;
2206 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
2207 continue;
2208 }
2209 signedTrack[trackIndex] = kTRUE;
2210
2211 // Build track parameters
2212 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2213 /* Int_t idx = 0;
2214 while(idx<3 && !lseed->IsOK()) {
2215 idx++;
2216 lseed++;
2217 }*/
2218 Double_t x = lseed->GetX0();// - 3.5;
2219 trackParams[0] = x; //NEW AB
2220 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2221 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2222 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2223 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2224 trackParams[5] = lseed->GetC();
2225 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2226 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2227
2228 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
eb2b4f91 2229 //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
f29f13a6 2230
f29f13a6 2231 AliTRDseedV1 *dseed[6];
b82b4de1 2232 for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
f29f13a6 2233
2234 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2235 //AliInfo(Form("Number of clusters %d.", nclusters));
2236 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2237 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2238 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2239 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
2240 cstreamer << "Clusters2TracksStack"
2241 << "EventNumber=" << eventNumber
2242 << "TrackNumber=" << trackNumber
2243 << "CandidateNumber=" << candidateNumber
2244 << "Iter=" << fSieveSeeding
2245 << "Like=" << fTrackQuality[trackIndex]
2246 << "S0.=" << dseed[0]
2247 << "S1.=" << dseed[1]
2248 << "S2.=" << dseed[2]
2249 << "S3.=" << dseed[3]
2250 << "S4.=" << dseed[4]
2251 << "S5.=" << dseed[5]
2252 << "p0=" << trackParams[0]
2253 << "p1=" << trackParams[1]
2254 << "p2=" << trackParams[2]
2255 << "p3=" << trackParams[3]
2256 << "p4=" << trackParams[4]
2257 << "p5=" << trackParams[5]
2258 << "p6=" << trackParams[6]
f29f13a6 2259 << "Ncl=" << ncl
2260 << "NLayers=" << nlayers
2261 << "Findable=" << findable
2262 << "NUsed=" << nused
2263 << "\n";
2264 }
d877f55f 2265
f29f13a6 2266 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2267 if(!track){
2268 AliWarning("Fail to build a TRD Track.");
2269 continue;
d877f55f 2270 }
41702fec 2271
f29f13a6 2272 //AliInfo("End of MakeTrack()");
2273 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2274 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2275 esdTrack->SetLabel(track->GetLabel());
2276 track->UpdateESDtrack(esdTrack);
2277 // write ESD-friends if neccessary
2278 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2279 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2280 calibTrack->SetOwner();
2281 esdTrack->AddCalibObject(calibTrack);
2282 }
2283 ntracks1++;
2284 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
41702fec 2285 }
2286
2287 jSieve++;
2288 } while(jSieve<5 && candidates); // end track candidates sieve
2289 if(!ntracks1) break;
2290
2291 // increment counters
2292 ntracks2 += ntracks1;
4302c900 2293
2294 if(fReconstructor->IsHLT()) break;
41702fec 2295 fSieveSeeding++;
2296
2297 // Rebuild plane configurations and indices taking only unused clusters into account
2298 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2299 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2300
2301 for(Int_t ip = 0; ip < kNPlanes; ip++){
2302 if(!(chamber = stack[ip])) continue;
b0a48c4d 2303 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2304 }
2305
eb2b4f91 2306 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2307 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2308 }
2309 } while(fSieveSeeding<10); // end stack clusters sieve
2310
2311
2312
2313 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2314
2315 return ntracks2;
e4f2f73d 2316}
2317
2318//___________________________________________________________________
eb38ed55 2319Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2320{
41702fec 2321 //
2322 // Assign probabilities to chambers according to their
2323 // capability of producing seeds.
2324 //
2325 // Parameters :
2326 //
2327 // layers : Array of stack propagation layers for all 6 chambers in one stack
2328 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2329 // for details) in the decreasing order of their seeding probabilities.
2330 //
2331 // Output :
2332 //
2333 // Return top configuration quality
2334 //
2335 // Detailed description:
2336 //
2337 // To each chamber seeding configuration (see GetSeedingConfig() for
2338 // the list of all configurations) one defines 2 quality factors:
2339 // - an apriori topological quality (see GetSeedingConfig() for details) and
2340 // - a data quality based on the uniformity of the distribution of
2341 // clusters over the x range (time bins population). See CookChamberQA() for details.
2342 // The overall chamber quality is given by the product of this 2 contributions.
2343 //
2344
eb2b4f91 2345 Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
41702fec 2346 AliTRDtrackingChamber *chamber = 0x0;
2347 for(int iplane=0; iplane<kNPlanes; iplane++){
2348 if(!(chamber = stack[iplane])) continue;
2349 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2350 }
2351
eb2b4f91 2352 Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
2353 Int_t planes[] = {0, 0, 0, 0};
41702fec 2354 for(int iconf=0; iconf<kNConfigs; iconf++){
2355 GetSeedingConfig(iconf, planes);
2356 tconfig[iconf] = fgTopologicQA[iconf];
2357 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2358 }
2359
2360 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2361 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2362 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2363 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2364
2365 return tconfig[configs[0]];
e4f2f73d 2366}
2367
2368//____________________________________________________________________
eb38ed55 2369Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2370{
afa21247 2371//
2a3191bb 2372// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
2373// either missed by TPC prolongation or conversions inside the TRD volume.
2374// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
afa21247 2375//
2376// Parameters :
2377// layers : Array of stack propagation layers containing clusters
2378// sseed : Array of empty tracklet seeds. On exit they are filled.
2379// ipar : Control parameters:
2380// ipar[0] -> seeding chambers configuration
2381// ipar[1] -> stack index
2382// ipar[2] -> number of track candidates found so far
2383//
2384// Output :
2385// Number of tracks candidates found.
2386//
2387// The following steps are performed:
2388// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
2389// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
2390// is described in AliTRDtrackerV1::Clusters2TracksStack().
2391// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
2392// - for each seeding cluster in the lower seeding layer find
2393// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
2394// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
2395// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
2396// reco params
2397// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
2398// seeding clusters.
2399// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
2400// and AliTRDchamberTimeBin::GetClusters().
2401// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
2402// performed at this level
2403// 4. Initialize seeding tracklets in the seeding chambers.
2404// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
2405// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
2406// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
2407// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
2408// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
2409// approximation of the track.
2410// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
2411// checked against the Riemann fit:
2412// - position resolution in y
2413// - angular resolution in the bending plane
2414// - likelihood of the number of clusters attached to the tracklet
2415// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
2416// - Initialization of extrapolation tracklets with the fit parameters
2417// - Attach clusters to extrapolated tracklets
2418// - Helix fit of tracklets
2419// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
2420// See AliTRDtrackerV1::ImproveSeedQuality() for details.
2421// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2422// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2423// 14. Cooking labels for tracklets. Should be done only for MC
2424// 15. Register seeds.
2425//
2426// Authors:
2427// Marian Ivanov <M.Ivanov@gsi.de>
2428// Alexandru Bercuci <A.Bercuci@gsi.de>
2429// Markus Fasel <M.Fasel@gsi.de>
41702fec 2430
2431 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2432 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2433 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2434 Int_t ncl, mcl; // working variable for looping over clusters
2435 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2436 // chi2 storage
2437 // chi2[0] = tracklet chi2 on the Z direction
2438 // chi2[1] = tracklet chi2 on the R direction
2439 Double_t chi2[4];
2440
afa21247 2441 // this should be data member of AliTRDtrack TODO
41702fec 2442 Double_t seedQuality[kMaxTracksStack];
2443
2444 // unpack control parameters
2445 Int_t config = ipar[0];
2446 Int_t ntracks = ipar[1];
d931f2aa 2447 Int_t istack = ipar[2];
41702fec 2448 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
afa21247 2449 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
be24510a 2450
2451
41702fec 2452 // Init chambers geometry
41702fec 2453 Double_t hL[kNPlanes]; // Tilting angle
2454 Float_t padlength[kNPlanes]; // pad lenghts
dd8059a8 2455 Float_t padwidth[kNPlanes]; // pad widths
41702fec 2456 AliTRDpadPlane *pp = 0x0;
2457 for(int iplane=0; iplane<kNPlanes; iplane++){
2458 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2459 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2460 padlength[iplane] = pp->GetLengthIPad();
dd8059a8 2461 padwidth[iplane] = pp->GetWidthIPad();
41702fec 2462 }
2463
eb2b4f91 2464 // Init anode wire position for chambers
e165b64b 2465 Double_t x0[kNPlanes], // anode wire position
eb2b4f91 2466 driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
2467 TGeoHMatrix *matrix = 0x0;
2468 Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
2469 Double_t glb[] = {0., 0., 0.};
2470 AliTRDtrackingChamber **cIter = &stack[0];
a3743898 2471 for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
eb2b4f91 2472 if(!(*cIter)) continue;
e165b64b 2473 if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
2474 continue;
2475 x0[iLayer] = fgkX0[iLayer];
2476 }
eb2b4f91 2477 matrix->LocalToMaster(loc, glb);
2478 x0[iLayer] = glb[0];
2479 }
2480
2481 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
41702fec 2482 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2483 }
2484
d931f2aa 2485 // Build seeding layers
d611c74f 2486 ResetSeedTB();
41702fec 2487 Int_t nlayers = 0;
41702fec 2488 for(int isl=0; isl<kNSeedPlanes; isl++){
2489 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2490 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2491 nlayers++;
41702fec 2492 }
eb2b4f91 2493 if(nlayers < kNSeedPlanes) return ntracks;
41702fec 2494
2495
2496 // Start finding seeds
2497 Double_t cond0[4], cond1[4], cond2[4];
2498 Int_t icl = 0;
d611c74f 2499 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2500 if(!c[3]) continue;
d611c74f 2501 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2502 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2503 //printf("Found c[3] candidates 0 %d\n", ncl);
2504 Int_t jcl = 0;
2505 while(jcl<ncl) {
d611c74f 2506 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2507 if(!c[0]) continue;
2508 Double_t dx = c[3]->GetX() - c[0]->GetX();
afa21247 2509 Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
2510 Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
2511 fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
d611c74f 2512 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2513 //printf("Found c[0] candidates 1 %d\n", mcl);
2514
2515 Int_t kcl = 0;
2516 while(kcl<mcl) {
d611c74f 2517 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2518 if(!c[1]) continue;
afa21247 2519 fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
d611c74f 2520 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2521 //printf("Found c[1] candidate 2 %p\n", c[2]);
2522 if(!c[2]) continue;
2523
2524 // AliInfo("Seeding clusters found. Building seeds ...");
2525 // 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());
2526
804bb02e 2527 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2528
d611c74f 2529 FitRieman(c, chi2);
2530
d931f2aa 2531 AliTRDseedV1 *tseed = &cseed[0];
bb2db46c 2532 cIter = &stack[0];
2533 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2534 Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
eb2b4f91 2535 tseed->SetDetector(det);
43d6ad34 2536 tseed->SetTilt(hL[iLayer]);
2537 tseed->SetPadLength(padlength[iLayer]);
dd8059a8 2538 tseed->SetPadWidth(padwidth[iLayer]);
3a039a31 2539 tseed->SetReconstructor(fReconstructor);
eb2b4f91 2540 tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
d611c74f 2541 tseed->Init(GetRiemanFitter());
f29f13a6 2542 tseed->SetStandAlone(kTRUE);
d611c74f 2543 }
2544
2545 Bool_t isFake = kFALSE;
3a039a31 2546 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2547 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2548 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2549 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2550
2551 Double_t xpos[4];
2552 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2553 Float_t yref[4];
2554 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2555 Int_t ll = c[3]->GetLabel(0);
2556 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2557 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2558 AliRieman *rim = GetRiemanFitter();
29f95561 2559 TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2560 cs0 << "MakeSeeds0"
2561 <<"EventNumber=" << eventNumber
2562 <<"CandidateNumber=" << candidateNumber
2563 <<"isFake=" << isFake
2564 <<"config=" << config
2565 <<"label=" << ll
2566 <<"chi2z=" << chi2[0]
2567 <<"chi2y=" << chi2[1]
2568 <<"Y2exp=" << cond2[0]
2569 <<"Z2exp=" << cond2[1]
2570 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2571 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2572 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2573 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2574 <<"yref0=" << yref[0]
2575 <<"yref1=" << yref[1]
2576 <<"yref2=" << yref[2]
2577 <<"yref3=" << yref[3]
2578 <<"c0.=" << c[0]
2579 <<"c1.=" << c[1]
2580 <<"c2.=" << c[2]
2581 <<"c3.=" << c[3]
2582 <<"Seed0.=" << &cseed[planes[0]]
2583 <<"Seed1.=" << &cseed[planes[1]]
2584 <<"Seed2.=" << &cseed[planes[2]]
2585 <<"Seed3.=" << &cseed[planes[3]]
2586 <<"RiemanFitter.=" << rim
2587 <<"\n";
2588 }
3a039a31 2589 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2590// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2591 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2592 continue;
2593 }
3a039a31 2594 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2595// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2596 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2597 continue;
2598 }
2599 //AliInfo("Passed chi2 filter.");
2600
2601 // try attaching clusters to tracklets
d611c74f 2602 Int_t mlayers = 0;
be24510a 2603 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2604 Int_t jLayer = planes[iLayer];
f29f13a6 2605 if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
2606 cseed[jLayer].UpdateUsed();
2607 if(!cseed[jLayer].IsOK()) continue;
d611c74f 2608 mlayers++;
2609 }
be24510a 2610
2611 if(mlayers < kNSeedPlanes){
2612 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2613 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2614 continue;
2615 }
2616
2617 // temporary exit door for the HLT
4302c900 2618 if(fReconstructor->IsHLT()){
be24510a 2619 // attach clusters to extrapolation chambers
2620 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2621 Int_t jLayer = planesExt[iLayer];
2622 if(!(chamber = stack[jLayer])) continue;
f29f13a6 2623 cseed[jLayer].AttachClusters(chamber, kTRUE);
be24510a 2624 }
4302c900 2625 fTrackQuality[ntracks] = 1.; // dummy value
2626 ntracks++;
218ba867 2627 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2628 cseed += 6;
2629 continue;
2630 }
2631
be24510a 2632
f29f13a6 2633 // Update Seeds and calculate Likelihood
d611c74f 2634 // fit tracklets and cook likelihood
f29f13a6 2635 FitTiltedRieman(&cseed[0], kTRUE);
2636 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2637 Int_t jLayer = planes[iLayer];
2638 cseed[jLayer].Fit(kTRUE);
2639 }
91834b8d 2640 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2641
3a039a31 2642 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2643 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2644 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2645 continue;
2646 }
2647 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2648
2649 // book preliminary results
2650 seedQuality[ntracks] = like;
2651 fSeedLayer[ntracks] = config;/*sLayer;*/
2652
2653 // attach clusters to the extrapolation seeds
be24510a 2654 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2655 Int_t jLayer = planesExt[iLayer];
d611c74f 2656 if(!(chamber = stack[jLayer])) continue;
d611c74f 2657
2658 // fit extrapolated seed
2659 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2660 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2661 AliTRDseedV1 pseed = cseed[jLayer];
f29f13a6 2662 if(!pseed.AttachClusters(chamber, kTRUE)) continue;
2663 pseed.Fit(kTRUE);
d611c74f 2664 cseed[jLayer] = pseed;
d611c74f 2665 FitTiltedRieman(cseed, kTRUE);
f29f13a6 2666 cseed[jLayer].Fit(kTRUE);
d611c74f 2667 }
2668
2669 // AliInfo("Extrapolation done.");
2670 // Debug Stream containing all the 6 tracklets
3a039a31 2671 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2672 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2673 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2674 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2675 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2676 cstreamer << "MakeSeeds1"
2677 << "EventNumber=" << eventNumber
2678 << "CandidateNumber=" << candidateNumber
2679 << "S0.=" << &cseed[0]
2680 << "S1.=" << &cseed[1]
2681 << "S2.=" << &cseed[2]
2682 << "S3.=" << &cseed[3]
2683 << "S4.=" << &cseed[4]
2684 << "S5.=" << &cseed[5]
2685 << "FitterT.=" << tiltedRieman
2686 << "\n";
2687 }
2688
b72f4eaf 2689 if(fReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2690 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2691 continue;
2692 }
2693 //AliInfo("Improve seed quality done.");
2694
2695 // fit full track and cook likelihoods
2696 // Double_t curv = FitRieman(&cseed[0], chi2);
2697 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2698 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2699
2700 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2701 Double_t chi2Vals[3];
2702 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
b72f4eaf 2703 if(fReconstructor->HasVertexConstrained())
d611c74f 2704 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2705 else
2706 chi2Vals[1] = 1.;
2707 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2708 // Chi2 definitions in testing stage
2709 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2710 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2711 //AliInfo("Hyperplane fit done\n");
fac58f00 2712
3a039a31 2713 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
29f95561 2714 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
d611c74f 2715 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2716 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2717 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2718 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2719 Int_t ncls = 0;
2720 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2721 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2722 }
d611c74f 2723 cstreamer << "MakeSeeds2"
2724 << "EventNumber=" << eventNumber
2725 << "CandidateNumber=" << candidateNumber
2726 << "Chi2TR=" << chi2Vals[0]
2727 << "Chi2TC=" << chi2Vals[1]
2728 << "Nlayers=" << mlayers
91834b8d 2729 << "NClusters=" << ncls
d611c74f 2730 << "Like=" << like
2731 << "S0.=" << &cseed[0]
2732 << "S1.=" << &cseed[1]
2733 << "S2.=" << &cseed[2]
2734 << "S3.=" << &cseed[3]
2735 << "S4.=" << &cseed[4]
2736 << "S5.=" << &cseed[5]
d611c74f 2737 << "FitterT.=" << fitterT
2738 << "FitterTC.=" << fitterTC
2739 << "\n";
2740 }
2741
2742 ntracks++;
2743 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2744 if(ntracks == kMaxTracksStack){
2745 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2746 return ntracks;
2747 }
2748 cseed += 6;
41702fec 2749 }
2750 }
2751 }
41702fec 2752
2753 return ntracks;
e4f2f73d 2754}
2755
2756//_____________________________________________________________________________
0906e73e 2757AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2758{
afa21247 2759//
2760// Build a TRD track out of tracklet candidates
2761//
2762// Parameters :
2763// seeds : array of tracklets
2764// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
2765// [0] - radial position of the track at reference point
2766// [1] - y position of the fit at [0]
2767// [2] - z position of the fit at [0]
2768// [3] - snp of the first tracklet
2769// [4] - tgl of the first tracklet
2770// [5] - curvature of the Riemann fit - 1/pt
2771// [6] - sector rotation angle
2772//
2773// Output :
2774// The TRD track.
2775//
2776// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
2777// (diagonal with constant variance terms TODO - correct parameterization)
2778//
2779// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
2780// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
2781// for details). Do also MC label calculation and PID if propagation successfully.
41702fec 2782
afa21247 2783
41702fec 2784 Double_t alpha = AliTRDgeometry::GetAlpha();
2785 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2786 Double_t c[15];
2787
afa21247 2788 c[ 0] = 0.2; // s^2_y
2789 c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
2790 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
2791 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
2792 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt
41702fec 2793
d20df6fc 2794 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2795 track.PropagateTo(params[0]-5.0);
f29f13a6 2796 AliTRDseedV1 *ptrTracklet = 0x0;
9887cc9f 2797
2798 // skip Kalman filter for HLT
91834b8d 2799 if(fReconstructor->IsHLT()){
9887cc9f 2800 for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
2801 track.UnsetTracklet(jLayer);
2802 ptrTracklet = &seeds[jLayer];
2803 if(!ptrTracklet->IsOK()) continue;
2804 if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
2805 ptrTracklet = SetTracklet(ptrTracklet);
f29f13a6 2806 ptrTracklet->UseClusters();
91834b8d 2807 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2808 }
d78d7df0 2809 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2810 ptrTrack->SetReconstructor(fReconstructor);
2811 return ptrTrack;
91834b8d 2812 }
393fda1c 2813
d20df6fc 2814 track.ResetCovariance(1);
e79f8eb0 2815 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2816 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2817 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2818 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2819 Double_t p[5]; // Track Params for the Debug Stream
2820 track.GetExternalParameters(params[0], p);
29f95561 2821 TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
393fda1c 2822 cs << "MakeTrack"
2823 << "EventNumber=" << eventNumber
2824 << "CandidateNumber=" << candidateNumber
2825 << "nc=" << nc
2826 << "X=" << params[0]
2827 << "Y=" << p[0]
2828 << "Z=" << p[1]
2829 << "snp=" << p[2]
2830 << "tnd=" << p[3]
2831 << "crv=" << p[4]
2832 << "Yin=" << params[1]
2833 << "Zin=" << params[2]
2834 << "snpin=" << params[3]
2835 << "tndin=" << params[4]
2836 << "crvin=" << params[5]
2837 << "track.=" << &track
2838 << "\n";
2839 }
d20df6fc 2840 if (nc < 30) return 0x0;
2841
2842 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2843 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2844 ptrTrack->CookLabel(.9);
24253b0a 2845
d20df6fc 2846 // computes PID for track
2847 ptrTrack->CookPID();
2848 // update calibration references using this track
48f8adf3 2849 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2850 if (!calibra){
2851 AliInfo("Could not get Calibra instance\n");
2852 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2853 }
d20df6fc 2854 return ptrTrack;
e4f2f73d 2855}
2856
0906e73e 2857
e4f2f73d 2858//____________________________________________________________________
eb38ed55 2859Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2860{
41702fec 2861 //
2862 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2863 //
2864 // Parameters :
2865 // layers : Array of propagation layers for a stack/supermodule
2866 // cseed : Array of 6 seeding tracklets which has to be improved
2867 //
f29f13a6 2868 // Output :
41702fec 2869 // cssed : Improved seeds
2870 //
2871 // Detailed description
2872 //
2873 // Iterative procedure in which new clusters are searched for each
2874 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2875 // can be maximized. If some optimization is found the old seeds are replaced.
2876 //
2877 // debug level: 7
2878 //
2879
2880 // make a local working copy
2881 AliTRDtrackingChamber *chamber = 0x0;
2882 AliTRDseedV1 bseed[6];
2883 Int_t nLayers = 0;
2884 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2885
2886 Float_t lastquality = 10000.0;
2887 Float_t lastchi2 = 10000.0;
2888 Float_t chi2 = 1000.0;
2889
2890 for (Int_t iter = 0; iter < 4; iter++) {
2891 Float_t sumquality = 0.0;
2892 Float_t squality[6];
2893 Int_t sortindexes[6];
2894
2895 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2896 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2897 sumquality += squality[jLayer];
2898 }
2899 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2900
2901 nLayers = 0;
2902 lastquality = sumquality;
2903 lastchi2 = chi2;
2904 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2905
2906 TMath::Sort(6, squality, sortindexes, kFALSE);
2907 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2908 Int_t bLayer = sortindexes[jLayer];
2909 if(!(chamber = stack[bLayer])) continue;
f29f13a6 2910 bseed[bLayer].AttachClusters(chamber, kTRUE);
2911 bseed[bLayer].Fit(kTRUE);
41702fec 2912 if(bseed[bLayer].IsOK()) nLayers++;
2913 }
2914
2915 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2916 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2917 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2918 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2919 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
29f95561 2920 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2921 cstreamer << "ImproveSeedQuality"
2922 << "EventNumber=" << eventNumber
2923 << "CandidateNumber=" << candidateNumber
2924 << "Iteration=" << iter
2925 << "S0.=" << &bseed[0]
2926 << "S1.=" << &bseed[1]
2927 << "S2.=" << &bseed[2]
2928 << "S3.=" << &bseed[3]
2929 << "S4.=" << &bseed[4]
2930 << "S5.=" << &bseed[5]
2931 << "FitterT.=" << tiltedRieman
2932 << "\n";
2933 }
2934 } // Loop: iter
41702fec 2935 // we are sure that at least 2 tracklets are OK !
2936 return nLayers+2;
e4f2f73d 2937}
2938
eb38ed55 2939//_________________________________________________________________________
2940Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2941 //
2942 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2943 // the track selection
2944 // The likelihood value containes:
2945 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2946 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2947 // For all Parameters an exponential dependency is used
2948 //
2949 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2950 // - Array of chi2 values:
2951 // * Non-Constrained Tilted Riemann fit
2952 // * Vertex-Constrained Tilted Riemann fit
2953 // * z-Direction from Linear fit
2954 // Output: - The calculated track likelihood
2955 //
2956 // debug level 2
2957 //
2958
f29f13a6 2959 Double_t chi2phi = 0, nLayers = 0;
41702fec 2960 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2961 if(!tracklets[iLayer].IsOK()) continue;
f29f13a6 2962 chi2phi += tracklets[iLayer].GetChi2Phi();
41702fec 2963 nLayers++;
2964 }
f29f13a6 2965 chi2phi /= Float_t (nLayers - 2.0);
41702fec 2966
2967 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
b72f4eaf 2968 Double_t likeChi2TC = (fReconstructor->HasVertexConstrained()) ?
d20df6fc 2969 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2970 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
f29f13a6 2971 Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
2972 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
41702fec 2973
3a039a31 2974 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2975 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2976 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
29f95561 2977 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 2978 cstreamer << "CalculateTrackLikelihood0"
2979 << "EventNumber=" << eventNumber
2980 << "CandidateNumber=" << candidateNumber
2981 << "LikeChi2Z=" << likeChi2Z
2982 << "LikeChi2TR=" << likeChi2TR
2983 << "LikeChi2TC=" << likeChi2TC
f29f13a6 2984 << "LikeChi2Phi=" << likeChi2Phi
41702fec 2985 << "TrackLikelihood=" << trackLikelihood
2986 << "\n";
2987 }
2988
2989 return trackLikelihood;
e4f2f73d 2990}
2991
2992//____________________________________________________________________
91834b8d 2993Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2994{
41702fec 2995 //
2996 // Calculate the probability of this track candidate.
2997 //
2998 // Parameters :
2999 // cseeds : array of candidate tracklets
3000 // planes : array of seeding planes (see seeding configuration)
3001 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
3002 //
3003 // Output :
3004 // likelihood value
3005 //
3006 // Detailed description
3007 //
3008 // The track quality is estimated based on the following 4 criteria:
3009 // 1. precision of the rieman fit on the Y direction (likea)
3010 // 2. chi2 on the Y direction (likechi2y)
3011 // 3. chi2 on the Z direction (likechi2z)
3012 // 4. number of attached clusters compared to a reference value
3013 // (see AliTRDrecoParam::fkFindable) (likeN)
3014 //
3015 // The distributions for each type of probabilities are given below as of
3016 // (date). They have to be checked to assure consistency of estimation.
3017 //
3018
3019 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 3020 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 3021
91834b8d 3022 Double_t chi2y = GetChi2Y(&cseed[0]);
3023 Double_t chi2z = GetChi2Z(&cseed[0]);
3024
8ae98148 3025 Float_t nclusters = 0.;
41702fec 3026 Double_t sumda = 0.;
3027 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
3028 Int_t jlayer = planes[ilayer];
3029 nclusters += cseed[jlayer].GetN2();
e3cf3d02 3030 sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
41702fec 3031 }
8ae98148 3032 nclusters *= .25;
3033
5a2e200c 3034 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
41702fec 3035 Double_t likechi2y = 0.0000000001;
5a2e200c 3036 if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
3037 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
8ae98148 3038 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 3039 Double_t like = likea * likechi2y * likechi2z * likeN;
3040
3041 // 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 3042 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 3043 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
3044 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 3045 Int_t nTracklets = 0; Float_t mean_ncls = 0;
3046 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
3047 if(!cseed[iseed].IsOK()) continue;
3048 nTracklets++;
3049 mean_ncls += cseed[iseed].GetN2();
3050 }
3051 if(nTracklets) mean_ncls /= nTracklets;
41702fec 3052 // The Debug Stream contains the seed
29f95561 3053 TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
41702fec 3054 cstreamer << "CookLikelihood"
3055 << "EventNumber=" << eventNumber
3056 << "CandidateNumber=" << candidateNumber
3057 << "tracklet0.=" << &cseed[0]
3058 << "tracklet1.=" << &cseed[1]
3059 << "tracklet2.=" << &cseed[2]
3060 << "tracklet3.=" << &cseed[3]
3061 << "tracklet4.=" << &cseed[4]
3062 << "tracklet5.=" << &cseed[5]
3063 << "sumda=" << sumda
91834b8d 3064 << "chi2y=" << chi2y
3065 << "chi2z=" << chi2z
41702fec 3066 << "likea=" << likea
3067 << "likechi2y=" << likechi2y
3068 << "likechi2z=" << likechi2z
3069 << "nclusters=" << nclusters
3070 << "likeN=" << likeN
3071 << "like=" << like
91834b8d 3072 << "meanncls=" << mean_ncls
41702fec 3073 << "\n";
3074 }
3075
3076 return like;
e4f2f73d 3077}
3078
e4f2f73d 3079//____________________________________________________________________
0906e73e 3080void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 3081{
41702fec 3082 //
3083 // Map seeding configurations to detector planes.
3084 //
3085 // Parameters :
3086 // iconfig : configuration index
3087 // planes : member planes of this configuration. On input empty.
3088 //
3089 // Output :
3090 // planes : contains the planes which are defining the configuration
3091 //
3092 // Detailed description
3093 //
3094 // Here is the list of seeding planes configurations together with
3095 // their topological classification:
3096 //
3097 // 0 - 5432 TQ 0
3098 // 1 - 4321 TQ 0
3099 // 2 - 3210 TQ 0
3100 // 3 - 5321 TQ 1
3101 // 4 - 4210 TQ 1
3102 // 5 - 5431 TQ 1
3103 // 6 - 4320 TQ 1
3104 // 7 - 5430 TQ 2
3105 // 8 - 5210 TQ 2
3106 // 9 - 5421 TQ 3
3107 // 10 - 4310 TQ 3
3108 // 11 - 5410 TQ 4
3109 // 12 - 5420 TQ 5
3110 // 13 - 5320 TQ 5
3111 // 14 - 5310 TQ 5
3112 //
3113 // The topologic quality is modeled as follows:
3114 // 1. The general model is define by the equation:
3115 // p(conf) = exp(-conf/2)
3116 // 2. According to the topologic classification, configurations from the same
3117 // class are assigned the agerage value over the model values.
3118 // 3. Quality values are normalized.
3119 //
3120 // The topologic quality distribution as function of configuration is given below:
3121 //Begin_Html
3122 // <img src="gif/topologicQA.gif">
3123 //End_Html
3124 //
3125
3126 switch(iconfig){
3127 case 0: // 5432 TQ 0
3128 planes[0] = 2;
3129 planes[1] = 3;
3130 planes[2] = 4;
3131 planes[3] = 5;
3132 break;
3133 case 1: // 4321 TQ 0
3134 planes[0] = 1;
3135 planes[1] = 2;
3136 planes[2] = 3;
3137 planes[3] = 4;
3138 break;
3139 case 2: // 3210 TQ 0
3140 planes[0] = 0;
3141 planes[1] = 1;
3142 planes[2] = 2;
3143 planes[3] = 3;
3144 break;
3145 case 3: // 5321 TQ 1
3146 planes[0] = 1;
3147 planes[1] = 2;
3148 planes[2] = 3;
3149 planes[3] = 5;
3150 break;
3151 case 4: // 4210 TQ 1
3152 planes[0] = 0;
3153 planes[1] = 1;
3154 planes[2] = 2;
3155 planes[3] = 4;
3156 break;
3157 case 5: // 5431 TQ 1
3158 planes[0] = 1;
3159 planes[1] = 3;
3160 planes[2] = 4;
3161 planes[3] = 5;
3162 break;
3163 case 6: // 4320 TQ 1
3164 planes[0] = 0;
3165 planes[1] = 2;
3166 planes[2] = 3;
3167 planes[3] = 4;
3168 break;
3169 case 7: // 5430 TQ 2
3170 planes[0] = 0;
3171 planes[1] = 3;
3172 planes[2] = 4;
3173 planes[3] = 5;
3174 break;
3175 case 8: // 5210 TQ 2
3176 planes[0] = 0;
3177 planes[1] = 1;
3178 planes[2] = 2;
3179 planes[3] = 5;
3180 break;
3181 case 9: // 5421 TQ 3
3182 planes[0] = 1;
3183 planes[1] = 2;
3184 planes[2] = 4;
3185 planes[3] = 5;
3186 break;
3187 case 10: // 4310 TQ 3
3188 planes[0] = 0;
3189 planes[1] = 1;
3190 planes[2] = 3;
3191 planes[3] = 4;
3192 break;
3193 case 11: // 5410 TQ 4
3194 planes[0] = 0;
3195 planes[1] = 1;
3196 planes[2] = 4;
3197 planes[3] = 5;
3198 break;
3199 case 12: // 5420 TQ 5
3200 planes[0] = 0;
3201 planes[1] = 2;
3202 planes[2] = 4;
3203 planes[3] = 5;
3204 break;
3205 case 13: // 5320 TQ 5
3206 planes[0] = 0;
3207 planes[1] = 2;
3208 planes[2] = 3;
3209 planes[3] = 5;
3210 break;
3211 case 14: // 5310 TQ 5
3212 planes[0] = 0;
3213 planes[1] = 1;
3214 planes[2] = 3;
3215 planes[3] = 5;
3216 break;
3217 }
e4f2f73d 3218}
3219
3220//____________________________________________________________________
0906e73e 3221void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3222{
41702fec 3223 //
3224 // Returns the extrapolation planes for a seeding configuration.
3225 //
3226 // Parameters :
3227 // iconfig : configuration index
3228 // planes : planes which are not in this configuration. On input empty.
3229 //
3230 // Output :
3231 // planes : contains the planes which are not in the configuration
3232 //
3233 // Detailed description
3234 //
3235
3236 switch(iconfig){
3237 case 0: // 5432 TQ 0
3238 planes[0] = 1;
3239 planes[1] = 0;
3240 break;
3241 case 1: // 4321 TQ 0
3242 planes[0] = 5;
3243 planes[1] = 0;
3244 break;
3245 case 2: // 3210 TQ 0
3246 planes[0] = 4;
3247 planes[1] = 5;
3248 break;
3249 case 3: // 5321 TQ 1
3250 planes[0] = 4;
3251 planes[1] = 0;
3252 break;
3253 case 4: // 4210 TQ 1
3254 planes[0] = 5;
3255 planes[1] = 3;
3256 break;
3257 case 5: // 5431 TQ 1
3258 planes[0] = 2;
3259 planes[1] = 0;
3260 break;
3261 case 6: // 4320 TQ 1
3262 planes[0] = 5;
3263 planes[1] = 1;
3264 break;
3265 case 7: // 5430 TQ 2
3266 planes[0] = 2;
3267 planes[1] = 1;
3268 break;
3269 case 8: // 5210 TQ 2
3270 planes[0] = 4;
3271 planes[1] = 3;
3272 break;
3273 case 9: // 5421 TQ 3
3274 planes[0] = 3;
3275 planes[1] = 0;
3276 break;
3277 case 10: // 4310 TQ 3
3278 planes[0] = 5;
3279 planes[1] = 2;
3280 break;
3281 case 11: // 5410 TQ 4
3282 planes[0] = 3;
3283 planes[1] = 2;
3284 break;
3285 case 12: // 5420 TQ 5
3286 planes[0] = 3;
3287 planes[1] = 1;
3288 break;
3289 case 13: // 5320 TQ 5
3290 planes[0] = 4;
3291 planes[1] = 1;
3292 break;
3293 case 14: // 5310 TQ 5
3294 planes[0] = 4;
3295 planes[1] = 2;
3296 break;
3297 }
e4f2f73d 3298}
eb38ed55 3299
3300//____________________________________________________________________
3301AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3302{
41702fec 3303 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3304 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3305}
3306
3b57a3f7 3307//____________________________________________________________________
3308AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3309{
41702fec 3310 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3311 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3312}
3313
3314//____________________________________________________________________
3315AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3316{
41702fec 3317 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3318 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3319}
3320
bb56afff 3321//____________________________________________________________________
3322Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3323 //
3324 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3325 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3326 // are taken into account
3327 //
3328 // Parameters: - Array of tracklets(AliTRDseedV1)
3329 //
3330 // Output: - The reference x-position(Float_t)
3331 //
3332 Int_t nDistances = 0;
3333 Float_t meanDistance = 0.;
3334 Int_t startIndex = 5;
3335 for(Int_t il =5; il > 0; il--){
3336 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3337 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3338 meanDistance += xdiff;
3339 nDistances++;
3340 }
3341 if(tracklets[il].IsOK()) startIndex = il;
3342 }
3343 if(tracklets[0].IsOK()) startIndex = 0;
3344 if(!nDistances){
3345 // We should normally never get here
3346 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3347 Int_t iok = 0, idiff = 0;
3348 // This attempt is worse and should be avoided:
3349 // check for two chambers which are OK and repeat this without taking the mean value
3350 // Strategy avoids a division by 0;
3351 for(Int_t il = 5; il >= 0; il--){
3352 if(tracklets[il].IsOK()){
3353 xpos[iok] = tracklets[il].GetX0();
3354 iok++;
3355 startIndex = il;
3356 }
3357 if(iok) idiff++; // to get the right difference;
3358 if(iok > 1) break;
3359 }
3360 if(iok > 1){
3361 meanDistance = (xpos[0] - xpos[1])/idiff;
3362 }
3363 else{
3364 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3365 return 331.;
3366 }
3367 }
3368 else{
3369 meanDistance /= nDistances;
3370 }
3371 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3372}
eb38ed55 3373
fac58f00 3374// //_____________________________________________________________________________
3375// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3376// , Int_t *outlist, Bool_t down)
3377// {
3378// //
3379// // Sort eleements according occurancy
3380// // The size of output array has is 2*n
3381// //
3382//
3383// if (n <= 0) {
3384// return 0;
3385// }
3386//
3387// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3388// Int_t *sindexF = new Int_t[2*n];
3389// for (Int_t i = 0; i < n; i++) {
3390// sindexF[i] = 0;
3391// }
3392//
3393// TMath::Sort(n,inlist,sindexS,down);
3394//
3395// Int_t last = inlist[sindexS[0]];
3396// Int_t val = last;
3397// sindexF[0] = 1;
3398// sindexF[0+n] = last;
3399// Int_t countPos = 0;
3400//
3401// // Find frequency
3402// for (Int_t i = 1; i < n; i++) {
3403// val = inlist[sindexS[i]];
3404// if (last == val) {
3405// sindexF[countPos]++;
3406// }
3407// else {
3408// countPos++;
3409// sindexF[countPos+n] = val;
3410// sindexF[countPos]++;
3411// last = val;
3412// }
3413// }
3414// if (last == val) {
3415// countPos++;
3416// }
3417//
3418// // Sort according frequency
3419// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3420//
3421// for (Int_t i = 0; i < countPos; i++) {
3422// outlist[2*i ] = sindexF[sindexS[i]+n];
3423// outlist[2*i+1] = sindexF[sindexS[i]];
3424// }
3425//
3426// delete [] sindexS;
3427// delete [] sindexF;
3428//
3429// return countPos;
3430//
3431// }
bb56afff 3432
06b32d95 3433
d611c74f 3434//____________________________________________________________________
3435void AliTRDtrackerV1::ResetSeedTB()
3436{
3437// reset buffer for seeding time bin layers. If the time bin
3438// layers are not allocated this function allocates them
3439
3440 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3441 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3442 else fSeedTB[isl]->Clear();
3443 }
3444}
3445
e3cf3d02 3446
3447//_____________________________________________________________________________
3448Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3449{
3450 // Calculates normalized chi2 in y-direction
3451 // chi2 = Sum chi2 / n_tracklets
3452
3453 Double_t chi2 = 0.; Int_t n = 0;
3454 for(Int_t ipl = kNPlanes; ipl--;){
3455 if(!tracklets[ipl].IsOK()) continue;
3456 chi2 += tracklets[ipl].GetChi2Y();
3457 n++;
3458 }
3459 return n ? chi2/n : 0.;
3460}
3461
bb56afff 3462//_____________________________________________________________________________
3463Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3464{
91834b8d 3465 // Calculates normalized chi2 in z-direction
e3cf3d02 3466 // chi2 = Sum chi2 / n_tracklets
41702fec 3467
e3cf3d02 3468 Double_t chi2 = 0; Int_t n = 0;
3469 for(Int_t ipl = kNPlanes; ipl--;){
41702fec 3470 if(!tracklets[ipl].IsOK()) continue;
e3cf3d02 3471 chi2 += tracklets[ipl].GetChi2Z();
3472 n++;
41702fec 3473 }
e3cf3d02 3474 return n ? chi2/n : 0.;
bb56afff 3475}
8acca6a3 3476
3477///////////////////////////////////////////////////////
3478// //
3479// Resources of class AliTRDLeastSquare //
3480// //
3481///////////////////////////////////////////////////////
3482
3483//_____________________________________________________________________________
3484AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3485 //
3486 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3487 //
3488 memset(fParams, 0, sizeof(Double_t) * 2);
3489 memset(fSums, 0, sizeof(Double_t) * 5);
3490 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3491
3492}
3493
3494//_____________________________________________________________________________
3495void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3496 //
3497 // Adding Point to the fitter
3498 //
3499 Double_t weight = 1/(sigmaY * sigmaY);
3500 Double_t &xpt = *x;
3501 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3502 fSums[0] += weight;
3503 fSums[1] += weight * xpt;
3504 fSums[2] += weight * y;
3505 fSums[3] += weight * xpt * y;
3506 fSums[4] += weight * xpt * xpt;
3507 fSums[5] += weight * y * y;
8acca6a3 3508}
3509
3510//_____________________________________________________________________________
3511void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3512 //
3513 // Remove Point from the sample
3514 //
3515 Double_t weight = 1/(sigmaY * sigmaY);
3516 Double_t &xpt = *x;
3517 fSums[0] -= weight;
3518 fSums[1] -= weight * xpt;
3519 fSums[2] -= weight * y;
3520 fSums[3] -= weight * xpt * y;
3521 fSums[4] -= weight * xpt * xpt;
3522 fSums[5] -= weight * y * y;
8acca6a3 3523}
3524
3525//_____________________________________________________________________________
3526void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3527 //
3528 // Evaluation of the fit:
3529 // Calculation of the parameters
3530 // Calculation of the covariance matrix
3531 //
3532
3533 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3534 if(denominator==0) return;
3535
41702fec 3536 // for(Int_t isum = 0; isum < 5; isum++)
3537 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3538 // printf("denominator = %f\n", denominator);
3539 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3540 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3541 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3542
3543 // Covariance matrix
3544 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3545 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3546 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3547}
3548
46b6abd7 3549//_____________________________________________________________________________
3550Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3551 //
3552 // Returns the Function value of the fitted function at a given x-position
3553 //
3554 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3555}
3556
3557//_____________________________________________________________________________
3558void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3559 //
3560 // Copies the values of the covariance matrix into the storage
3561 //
3562 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3563}
3564