Correct warnings for gcc 4.3
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.cxx
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bcb6fb78 1
e4f2f73d 2/**************************************************************************
972ef65e 3* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4* *
5* Author: The ALICE Off-line Project. *
6* Contributors are mentioned in the code where appropriate. *
7* *
8* Permission to use, copy, modify and distribute this software and its *
9* documentation strictly for non-commercial purposes is hereby granted *
10* without fee, provided that the above copyright notice appears in all *
11* copies and that both the copyright notice and this permission notice *
12* appear in the supporting documentation. The authors make no claims *
13* about the suitability of this software for any purpose. It is *
14* provided "as is" without express or implied warranty. *
15**************************************************************************/
e4f2f73d 16
17/* $Id$ */
18
19///////////////////////////////////////////////////////////////////////////////
20// //
21// Track finder //
22// //
23// Authors: //
24// Alex Bercuci <A.Bercuci@gsi.de> //
25// Markus Fasel <M.Fasel@gsi.de> //
26// //
27///////////////////////////////////////////////////////////////////////////////
28
bb56afff 29// #include <Riostream.h>
30// #include <stdio.h>
31// #include <string.h>
e4f2f73d 32
33#include <TBranch.h>
bb56afff 34#include <TDirectory.h>
e4f2f73d 35#include <TLinearFitter.h>
e4f2f73d 36#include <TTree.h>
37#include <TClonesArray.h>
e4f2f73d 38#include <TTreeStream.h>
39
40#include "AliLog.h"
41#include "AliESDEvent.h"
bb56afff 42#include "AliGeomManager.h"
e4f2f73d 43#include "AliRieman.h"
44#include "AliTrackPointArray.h"
45
e4f2f73d 46#include "AliTRDgeometry.h"
47#include "AliTRDpadPlane.h"
e4f2f73d 48#include "AliTRDcalibDB.h"
e4f2f73d 49#include "AliTRDReconstructor.h"
50#include "AliTRDCalibraFillHisto.h"
e4f2f73d 51#include "AliTRDrecoParam.h"
bb56afff 52
53#include "AliTRDcluster.h"
e4f2f73d 54#include "AliTRDseedV1.h"
0906e73e 55#include "AliTRDtrackV1.h"
bb56afff 56#include "AliTRDtrackerV1.h"
57#include "AliTRDtrackerDebug.h"
58#include "AliTRDtrackingChamber.h"
59#include "AliTRDchamberTimeBin.h"
60
e4f2f73d 61
e4f2f73d 62
63ClassImp(AliTRDtrackerV1)
eb38ed55 64
65
66const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
67const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
68const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
69const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
70const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
d76231c8 71Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
41702fec 72 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
73 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
74 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
e4f2f73d 75};
2985ffcb 76Int_t AliTRDtrackerV1::fgNTimeBins = 0;
eb38ed55 77TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
78AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
79TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
80TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
e4f2f73d 81
82//____________________________________________________________________
3a039a31 83AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
41702fec 84 :AliTracker()
06b32d95 85 ,fReconstructor(0x0)
41702fec 86 ,fGeom(new AliTRDgeometry())
87 ,fClusters(0x0)
88 ,fTracklets(0x0)
89 ,fTracks(0x0)
90 ,fSieveSeeding(0)
e4f2f73d 91{
41702fec 92 //
93 // Default constructor.
94 //
a7ac01d2 95 AliTRDcalibDB *trd = 0x0;
96 if (!(trd = AliTRDcalibDB::Instance())) {
41702fec 97 AliFatal("Could not get calibration object");
98 }
a7ac01d2 99
100 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
41702fec 101
053767a4 102 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
3a039a31 103
d611c74f 104 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
d20df6fc 105
3a039a31 106 // Initialize debug stream
06b32d95 107 if(rec) SetReconstructor(rec);
eb38ed55 108}
109
e4f2f73d 110//____________________________________________________________________
111AliTRDtrackerV1::~AliTRDtrackerV1()
112{
41702fec 113 //
114 // Destructor
115 //
116
117 if(fgDebugStreamer) delete fgDebugStreamer;
118 if(fgRieman) delete fgRieman;
119 if(fgTiltedRieman) delete fgTiltedRieman;
120 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
d611c74f 121 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
41702fec 122 if(fTracks) {fTracks->Delete(); delete fTracks;}
123 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
48f8adf3 124 if(fClusters) {
125 fClusters->Delete(); delete fClusters;
126 }
41702fec 127 if(fGeom) delete fGeom;
e4f2f73d 128}
129
130//____________________________________________________________________
131Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
132{
41702fec 133 //
134 // Steering stand alone tracking for full TRD detector
135 //
136 // Parameters :
137 // esd : The ESD event. On output it contains
138 // the ESD tracks found in TRD.
139 //
140 // Output :
141 // Number of tracks found in the TRD detector.
142 //
143 // Detailed description
144 // 1. Launch individual SM trackers.
145 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
146 //
147
3a039a31 148 if(!fReconstructor->GetRecoParam() ){
149 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
41702fec 150 return 0;
151 }
152
153 //AliInfo("Start Track Finder ...");
154 Int_t ntracks = 0;
053767a4 155 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
41702fec 156 // for(int ism=1; ism<2; ism++){
157 //AliInfo(Form("Processing supermodule %i ...", ism));
158 ntracks += Clusters2TracksSM(ism, esd);
159 }
160 AliInfo(Form("Number of found tracks : %d", ntracks));
161 return ntracks;
e4f2f73d 162}
163
0906e73e 164
165//_____________________________________________________________________________
eb38ed55 166Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
0906e73e 167{
41702fec 168 //AliInfo(Form("Asking for tracklet %d", index));
169
2f7514a6 170 AliTRDseedV1 *tracklet = GetTracklet(index);
171 if (!tracklet) return kFALSE;
41702fec 172
173 // get detector for this tracklet
174 AliTRDcluster *cl = 0x0;
175 Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
176 Int_t idet = cl->GetDetector();
177
178 Double_t local[3];
179 local[0] = tracklet->GetX0();
180 local[1] = tracklet->GetYfit(0);
181 local[2] = tracklet->GetZfit(0);
182 Double_t global[3];
183 fGeom->RotateBack(idet, local, global);
184 p.SetXYZ(global[0],global[1],global[2]);
185
186
187 // setting volume id
188 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
053767a4 189 switch (fGeom->GetLayer(idet)) {
41702fec 190 case 0:
191 iLayer = AliGeomManager::kTRD1;
192 break;
193 case 1:
194 iLayer = AliGeomManager::kTRD2;
195 break;
196 case 2:
197 iLayer = AliGeomManager::kTRD3;
198 break;
199 case 3:
200 iLayer = AliGeomManager::kTRD4;
201 break;
202 case 4:
203 iLayer = AliGeomManager::kTRD5;
204 break;
205 case 5:
206 iLayer = AliGeomManager::kTRD6;
207 break;
208 };
053767a4 209 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
41702fec 210 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
211 p.SetVolumeID(volid);
212
213 return kTRUE;
0906e73e 214}
215
eb38ed55 216//____________________________________________________________________
217TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
218{
41702fec 219 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
220 return fgTiltedRieman;
eb38ed55 221}
0906e73e 222
eb38ed55 223//____________________________________________________________________
224TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
225{
41702fec 226 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
227 return fgTiltedRiemanConstrained;
eb38ed55 228}
41702fec 229
eb38ed55 230//____________________________________________________________________
231AliRieman* AliTRDtrackerV1::GetRiemanFitter()
232{
053767a4 233 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
41702fec 234 return fgRieman;
eb38ed55 235}
41702fec 236
0906e73e 237//_____________________________________________________________________________
238Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
239{
41702fec 240 //
241 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
242 // backpropagated by the TPC tracker. Each seed is first propagated
243 // to the TRD, and then its prolongation is searched in the TRD.
244 // If sufficiently long continuation of the track is found in the TRD
245 // the track is updated, otherwise it's stored as originaly defined
246 // by the TPC tracker.
247 //
248
249 // Calibration monitor
250 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
251 if (!calibra) AliInfo("Could not get Calibra instance\n");
252
253 Int_t found = 0; // number of tracks found
254 Float_t foundMin = 20.0;
255
d611c74f 256 Float_t *quality = 0x0;
257 Int_t *index = 0x0;
41702fec 258 Int_t nSeed = event->GetNumberOfTracks();
d611c74f 259 if(nSeed){
260 quality = new Float_t[nSeed];
261 index = new Int_t[nSeed];
262 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
263 AliESDtrack *seed = event->GetTrack(iSeed);
264 Double_t covariance[15];
265 seed->GetExternalCovariance(covariance);
266 quality[iSeed] = covariance[0] + covariance[2];
267 }
268 // Sort tracks according to covariance of local Y and Z
269 TMath::Sort(nSeed,quality,index,kFALSE);
41702fec 270 }
41702fec 271
272 // Backpropagate all seeds
273 Int_t expectedClr;
274 AliTRDtrackV1 track;
275 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
276
277 // Get the seeds in sorted sequence
278 AliESDtrack *seed = event->GetTrack(index[iSeed]);
279
280 // Check the seed status
281 ULong_t status = seed->GetStatus();
282 if ((status & AliESDtrack::kTPCout) == 0) continue;
283 if ((status & AliESDtrack::kTRDout) != 0) continue;
284
285 // Do the back prolongation
286 new(&track) AliTRDtrackV1(*seed);
215f7116 287 track.SetReconstructor(fReconstructor);
288
41702fec 289 //Int_t lbl = seed->GetLabel();
290 //track.SetSeedLabel(lbl);
e4d4864b 291
292 // Make backup and mark entrance in the TRD
76b60503 293 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
294 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
41702fec 295 Float_t p4 = track.GetC();
ae3fbe1f 296 expectedClr = FollowBackProlongation(track);
297
298 if (expectedClr<0) continue; // Back prolongation failed
299
300 if(expectedClr){
d611c74f 301 found++;
41702fec 302 // computes PID for track
303 track.CookPID();
304 // update calibration references using this track
305 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
306 // save calibration object
224f357f 307 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
308 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
309 calibTrack->SetOwner();
310 seed->AddCalibObject(calibTrack);
311 }
312 //update ESD track
41702fec 313 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
2389e96f 314 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
41702fec 315 track.UpdateESDtrack(seed);
41702fec 316 }
317 }
318
319 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
320 //
321 // Make backup for back propagation
322 //
323 Int_t foundClr = track.GetNumberOfClusters();
324 if (foundClr >= foundMin) {
325 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
326 //track.CookdEdx();
327 //track.CookdEdxTimBin(seed->GetID());
328 track.CookLabel(1. - fgkLabelFraction);
329 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
41702fec 330
331 // Sign only gold tracks
332 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
76b60503 333 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
334 //UseClusters(&track);
335 }
41702fec 336 }
337 Bool_t isGold = kFALSE;
338
339 // Full gold track
340 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
341 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
342
343 isGold = kTRUE;
344 }
345
346 // Almost gold track
347 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
348 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
349 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
350
351 isGold = kTRUE;
352 }
353
354 if ((!isGold) && (track.GetBackupTrack())) {
355 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
356 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
357 isGold = kTRUE;
358 }
359 }
360
361 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
362 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
363 //}
364 }
365 }
366
367 // Propagation to the TOF (I.Belikov)
368 if (track.IsStopped() == kFALSE) {
369 Double_t xtof = 371.0;
370 Double_t xTOF0 = 370.0;
371
372 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
373 if (TMath::Abs(c2) >= 0.99) continue;
374
ae3fbe1f 375 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
41702fec 376
377 // Energy losses taken to the account - check one more time
378 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
379 if (TMath::Abs(c2) >= 0.99) continue;
380
381 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
382 // fHBackfit->Fill(7);
383 //delete track;
384 // continue;
385 //}
386
387 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
388 Double_t y;
389 track.GetYAt(xtof,GetBz(),y);
390 if (y > ymax) {
391 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
392 }else if (y < -ymax) {
393 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
394 }
395
396 if (track.PropagateTo(xtof)) {
397 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
398 track.UpdateESDtrack(seed);
41702fec 399 }
400 } else {
401 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
402 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
403
404 track.UpdateESDtrack(seed);
41702fec 405 }
406 }
407
408 seed->SetTRDQuality(track.StatusForTOF());
409 seed->SetTRDBudget(track.GetBudget(0));
410 }
d611c74f 411 if(index) delete [] index;
412 if(quality) delete [] quality;
41702fec 413
414
415 AliInfo(Form("Number of seeds: %d", nSeed));
416 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
417
d611c74f 418 // run stand alone tracking
3a039a31 419 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
41702fec 420
421 return 0;
0906e73e 422}
423
424
425//____________________________________________________________________
426Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
427{
41702fec 428 //
429 // Refits tracks within the TRD. The ESD event is expected to contain seeds
430 // at the outer part of the TRD.
431 // The tracks are propagated to the innermost time bin
432 // of the TRD and the ESD event is updated
433 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
434 //
435
436 Int_t nseed = 0; // contor for loaded seeds
437 Int_t found = 0; // contor for updated TRD tracks
438
439
440 AliTRDtrackV1 track;
441 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
442 AliESDtrack *seed = event->GetTrack(itrack);
443 new(&track) AliTRDtrackV1(*seed);
444
445 if (track.GetX() < 270.0) {
446 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
447 continue;
448 }
449
450 ULong_t status = seed->GetStatus();
e4d4864b 451 // reject tracks which failed propagation in the TRD
41702fec 452 if((status & AliESDtrack::kTRDout) == 0) continue;
e4d4864b 453
454 // reject tracks which are produced by the TRD stand alone track finder.
455 if((status & AliESDtrack::kTRDin) == 0) continue;
41702fec 456 nseed++;
457
458 track.ResetCovariance(50.0);
459
460 // do the propagation and processing
461 Bool_t kUPDATE = kFALSE;
462 Double_t xTPC = 250.0;
463 if(FollowProlongation(track)){
464 // Prolongate to TPC
465 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
466 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
467 found++;
468 kUPDATE = kTRUE;
469 }
470 }
471
472 // Prolongate to TPC without update
473 if(!kUPDATE) {
474 AliTRDtrackV1 tt(*seed);
475 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
476 }
477 }
478 AliInfo(Form("Number of loaded seeds: %d",nseed));
479 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
480
481 return 0;
0906e73e 482}
483
0906e73e 484//____________________________________________________________________
485Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
486{
41702fec 487 // Extrapolates the TRD track in the TPC direction.
488 //
489 // Parameters
490 // t : the TRD track which has to be extrapolated
491 //
492 // Output
493 // number of clusters attached to the track
494 //
495 // Detailed description
496 //
497 // Starting from current radial position of track <t> this function
498 // extrapolates the track through the 6 TRD layers. The following steps
499 // are being performed for each plane:
500 // 1. prepare track:
501 // a. get plane limits in the local x direction
502 // b. check crossing sectors
503 // c. check track inclination
504 // 2. search tracklet in the tracker list (see GetTracklet() for details)
505 // 3. evaluate material budget using the geo manager
506 // 4. propagate and update track using the tracklet information.
507 //
508 // Debug level 2
509 //
510
511 Int_t nClustersExpected = 0;
512 Int_t lastplane = 5; //GetLastPlane(&t);
513 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
514 Int_t index = 0;
515 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
516 if(!tracklet) continue;
517 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
518
519 Double_t x = tracklet->GetX0();
520 // reject tracklets which are not considered for inward refit
521 if(x > t.GetX()+fgkMaxStep) continue;
522
523 // append tracklet to track
524 t.SetTracklet(tracklet, index);
525
526 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
527 if (!AdjustSector(&t)) break;
528
529 // Start global position
530 Double_t xyz0[3];
531 t.GetXYZ(xyz0);
532
533 // End global position
534 Double_t alpha = t.GetAlpha(), y, z;
535 if (!t.GetProlongation(x,y,z)) break;
536 Double_t xyz1[3];
537 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
538 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
539 xyz1[2] = z;
540
541 // Get material budget
542 Double_t param[7];
543 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
544 Double_t xrho= param[0]*param[4];
545 Double_t xx0 = param[1]; // Get mean propagation parameters
546
547 // Propagate and update
548 t.PropagateTo(x, xx0, xrho);
549 if (!AdjustSector(&t)) break;
550
551 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
552 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
553 nClustersExpected += tracklet->GetN();
554 }
555 }
556
3a039a31 557 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 558 Int_t index;
559 for(int iplane=0; iplane<6; iplane++){
560 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
561 if(!tracklet) continue;
562 t.SetTracklet(tracklet, index);
563 }
564
565 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
566 TTreeSRedirector &cstreamer = *fgDebugStreamer;
567 cstreamer << "FollowProlongation"
568 << "EventNumber=" << eventNumber
569 << "ncl=" << nClustersExpected
570 //<< "track.=" << &t
571 << "\n";
572 }
573
574 return nClustersExpected;
0906e73e 575
576}
577
578//_____________________________________________________________________________
579Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
580{
41702fec 581 // Extrapolates the TRD track in the TOF direction.
582 //
583 // Parameters
584 // t : the TRD track which has to be extrapolated
585 //
586 // Output
587 // number of clusters attached to the track
588 //
589 // Detailed description
590 //
591 // Starting from current radial position of track <t> this function
592 // extrapolates the track through the 6 TRD layers. The following steps
593 // are being performed for each plane:
594 // 1. prepare track:
595 // a. get plane limits in the local x direction
596 // b. check crossing sectors
597 // c. check track inclination
598 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
599 // 3. evaluate material budget using the geo manager
600 // 4. propagate and update track using the tracklet information.
601 //
602 // Debug level 2
603 //
604
605 Int_t nClustersExpected = 0;
606 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
607 AliTRDtrackingChamber *chamber = 0x0;
608
3b57a3f7 609 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
181d2c97 610 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
611 AliTRDseedV1 *tracklets[kNPlanes];
612 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
613 for(Int_t ip = 0; ip < kNPlanes; ip++){
614 tracklets[ip] = t.GetTracklet(ip);
615 t.UnsetTracklet(ip);
616 }
3b57a3f7 617
053767a4 618 // Loop through the TRD layers
619 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
41702fec 620 // BUILD TRACKLET IF NOT ALREADY BUILT
621 Double_t x = 0., y, z, alpha;
181d2c97 622 ptrTracklet = tracklets[ilayer];
41702fec 623 if(!ptrTracklet){
053767a4 624 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
43d6ad34 625 ptrTracklet->SetReconstructor(fReconstructor);
41702fec 626 alpha = t.GetAlpha();
053767a4 627 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
41702fec 628
629 if(!fTrSec[sector].GetNChambers()) continue;
630
053767a4 631 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
41702fec 632
43d6ad34 633 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
053767a4 634 Int_t stack = fGeom->GetStack(z, ilayer);
41702fec 635 Int_t nCandidates = stack >= 0 ? 1 : 2;
636 z -= stack >= 0 ? 0. : 4.;
637
638 for(int icham=0; icham<nCandidates; icham++, z+=8){
053767a4 639 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
41702fec 640
053767a4 641 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
41702fec 642
3a039a31 643 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 644
645 x = chamber->GetX();
646
053767a4 647 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
aec26713 648 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
41702fec 649 tracklet.SetPadLength(pp->GetLengthIPad());
ae4e8b84 650 tracklet.SetDetector(chamber->GetDetector());
41702fec 651 tracklet.SetX0(x);
652 if(!tracklet.Init(&t)){
653 t.SetStopped(kTRUE);
654 return nClustersExpected;
655 }
2389e96f 656 if(!tracklet.AttachClustersIter(chamber, 1., kTRUE)) continue;
41702fec 657 tracklet.Init(&t);
658
3a039a31 659 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 660
661 break;
662 }
76b60503 663 //ptrTracklet->UseClusters();
41702fec 664 }
665 if(!ptrTracklet->IsOK()){
666 if(x < 1.) continue; //temporary
43d6ad34 667 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
668 if(!AdjustSector(&t)) return -nClustersExpected;
669 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 670 continue;
671 }
672
673 // Propagate closer to the current chamber if neccessary
674 x -= clength;
43d6ad34 675 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
676 if (!AdjustSector(&t)) return -nClustersExpected;
677 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
41702fec 678
679 // load tracklet to the tracker and the track
680 ptrTracklet = SetTracklet(ptrTracklet);
681 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
682
683
684 // Calculate the mean material budget along the path inside the chamber
685 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
686 Double_t xyz0[3]; // entry point
687 t.GetXYZ(xyz0);
688 alpha = t.GetAlpha();
689 x = ptrTracklet->GetX0();
43d6ad34 690 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
41702fec 691 Double_t xyz1[3]; // exit point
692 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
693 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
694 xyz1[2] = z;
695 Double_t param[7];
696 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
697 // The mean propagation parameters
698 Double_t xrho = param[0]*param[4]; // density*length
699 Double_t xx0 = param[1]; // radiation length
700
701 // Propagate and update track
43d6ad34 702 if (!t.PropagateTo(x, xx0, xrho)) return -nClustersExpected;
703 if (!AdjustSector(&t)) return -nClustersExpected;
41702fec 704 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
43d6ad34 705 if (!t.Update(ptrTracklet, maxChi2)) return -nClustersExpected;
ae3fbe1f 706 if (maxChi2<1e+10) {
41702fec 707 nClustersExpected += ptrTracklet->GetN();
708 //t.SetTracklet(&tracklet, index);
709 }
710 // Reset material budget if 2 consecutive gold
053767a4 711 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
41702fec 712
713 // Make backup of the track until is gold
714 // TO DO update quality check of the track.
715 // consider comparison with fTimeBinsRange
716 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
717 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
718 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
719 //printf("ratio0 %f [> 0.8]\n", ratio0);
720 //printf("ratio1 %f [> 0.6]\n", ratio1);
721 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
722 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
723 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
724 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
725
726 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
727 (ratio0 > 0.8) &&
728 //(ratio1 > 0.6) &&
729 //(ratio0+ratio1 > 1.5) &&
730 (t.GetNCross() == 0) &&
731 (TMath::Abs(t.GetSnp()) < 0.85) &&
732 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
733
053767a4 734 } // end layers loop
41702fec 735
3a039a31 736 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 737 TTreeSRedirector &cstreamer = *fgDebugStreamer;
738 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
739 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
740 //debugTrack->SetOwner();
741 cstreamer << "FollowBackProlongation"
742 << "EventNumber=" << eventNumber
743 << "ncl=" << nClustersExpected
744 //<< "track.=" << debugTrack
745 << "\n";
746 }
747
748 return nClustersExpected;
0906e73e 749}
750
eb38ed55 751//_________________________________________________________________________
752Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
41702fec 753 //
754 // Fits a Riemann-circle to the given points without tilting pad correction.
755 // The fit is performed using an instance of the class AliRieman (equations
756 // and transformations see documentation of this class)
757 // Afterwards all the tracklets are Updated
758 //
759 // Parameters: - Array of tracklets (AliTRDseedV1)
760 // - Storage for the chi2 values (beginning with direction z)
761 // - Seeding configuration
762 // Output: - The curvature
763 //
764 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
765 fitter->Reset();
766 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
767 Int_t *ppl = &allplanes[0];
768 Int_t maxLayers = 6;
769 if(planes){
770 maxLayers = 4;
771 ppl = planes;
772 }
773 for(Int_t il = 0; il < maxLayers; il++){
774 if(!tracklets[ppl[il]].IsOK()) continue;
775 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
776 }
777 fitter->Update();
778 // Set the reference position of the fit and calculate the chi2 values
779 memset(chi2, 0, sizeof(Double_t) * 2);
780 for(Int_t il = 0; il < maxLayers; il++){
781 // Reference positions
782 tracklets[ppl[il]].Init(fitter);
783
784 // chi2
785 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
786 chi2[0] += tracklets[ppl[il]].GetChi2Y();
787 chi2[1] += tracklets[ppl[il]].GetChi2Z();
788 }
789 return fitter->GetC();
eb38ed55 790}
791
792//_________________________________________________________________________
793void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
794{
41702fec 795 //
796 // Performs a Riemann helix fit using the seedclusters as spacepoints
797 // Afterwards the chi2 values are calculated and the seeds are updated
798 //
799 // Parameters: - The four seedclusters
800 // - The tracklet array (AliTRDseedV1)
801 // - The seeding configuration
802 // - Chi2 array
803 //
804 // debug level 2
805 //
806 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
807 fitter->Reset();
808 for(Int_t i = 0; i < 4; i++)
809 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
810 fitter->Update();
811
812
813 // Update the seed and calculated the chi2 value
814 chi2[0] = 0; chi2[1] = 0;
815 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
816 // chi2
817 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
818 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
819 }
eb38ed55 820}
821
822
823//_________________________________________________________________________
824Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
825{
41702fec 826 //
827 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
828 // assumed that the vertex position is set to 0.
829 // This method is very usefull for high-pt particles
830 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
831 // x0, y0: Center of the circle
832 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
833 // zc: center of the pad row
834 // Equation which has to be fitted (after transformation):
835 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
836 // Transformation:
837 // t = 1/(x^2 + y^2)
838 // u = 2 * x * t
839 // v = 2 * x * tan(phiT) * t
840 // Parameters in the equation:
841 // a = -1/y0, b = x0/y0, e = dz/dx
842 //
843 // The Curvature is calculated by the following equation:
844 // - curv = a/Sqrt(b^2 + 1) = 1/R
845 // Parameters: - the 6 tracklets
846 // - the Vertex constraint
847 // Output: - the Chi2 value of the track
848 //
849 // debug level 5
850 //
851
852 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
853 fitter->StoreData(kTRUE);
854 fitter->ClearPoints();
855 AliTRDcluster *cl = 0x0;
856
857 Float_t x, y, z, w, t, error, tilt;
858 Double_t uvt[2];
859 Int_t nPoints = 0;
053767a4 860 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
861 if(!tracklets[ilr].IsOK()) continue;
41702fec 862 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
053767a4 863 if(!tracklets[ilr].IsUsable(itb)) continue;
864 cl = tracklets[ilr].GetClusters(itb);
41702fec 865 x = cl->GetX();
866 y = cl->GetY();
867 z = cl->GetZ();
053767a4 868 tilt = tracklets[ilr].GetTilt();
41702fec 869 // Transformation
870 t = 1./(x * x + y * y);
871 uvt[0] = 2. * x * t;
872 uvt[1] = 2. * x * t * tilt ;
873 w = 2. * (y + tilt * (z - zVertex)) * t;
874 error = 2. * 0.2 * t;
875 fitter->AddPoint(uvt, w, error);
876 nPoints++;
877 }
878 }
879 fitter->Eval();
880
881 // Calculate curvature
882 Double_t a = fitter->GetParameter(0);
883 Double_t b = fitter->GetParameter(1);
884 Double_t curvature = a/TMath::Sqrt(b*b + 1);
885
886 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
887 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
888 tracklets[ip].SetCC(curvature);
889
3a039a31 890/* if(fReconstructor->GetStreamLevel() >= 5){
41702fec 891 //Linear Model on z-direction
892 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
893 Double_t slope = fitter->GetParameter(2);
894 Double_t zref = slope * xref;
895 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
896 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
897 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
898 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
899 treeStreamer << "FitTiltedRiemanConstraint"
900 << "EventNumber=" << eventNumber
901 << "CandidateNumber=" << candidateNumber
902 << "Curvature=" << curvature
903 << "Chi2Track=" << chi2track
904 << "Chi2Z=" << chi2Z
905 << "zref=" << zref
906 << "\n";
3a039a31 907 }*/
41702fec 908 return chi2track;
eb38ed55 909}
910
911//_________________________________________________________________________
912Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
913{
41702fec 914 //
915 // Performs a Riemann fit taking tilting pad correction into account
916 // The equation of a Riemann circle, where the y position is substituted by the
917 // measured y-position taking pad tilting into account, has to be transformed
918 // into a 4-dimensional hyperplane equation
919 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
920 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
921 // zc: center of the pad row
922 // zt: z-position of the track
923 // The z-position of the track is assumed to be linear dependent on the x-position
924 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
925 // Transformation: u = 2 * x * t
926 // v = 2 * tan(phiT) * t
927 // w = 2 * tan(phiT) * (x - xref) * t
928 // t = 1 / (x^2 + ymeas^2)
929 // Parameters: a = -1/y0
930 // b = x0/y0
931 // c = (R^2 -x0^2 - y0^2)/y0
932 // d = offset
933 // e = dz/dx
934 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
935 // results from the simple riemann fit. Afterwards the fit is redone.
936 // The curvature is calculated according to the formula:
937 // curv = a/(1 + b^2 + c*a) = 1/R
938 //
939 // Paramters: - Array of tracklets (connected to the track candidate)
940 // - Flag selecting the error definition
941 // Output: - Chi2 values of the track (in Parameter list)
942 //
943 TLinearFitter *fitter = GetTiltedRiemanFitter();
944 fitter->StoreData(kTRUE);
945 fitter->ClearPoints();
946 AliTRDLeastSquare zfitter;
947 AliTRDcluster *cl = 0x0;
948
949 Double_t xref = CalculateReferenceX(tracklets);
950 Double_t x, y, z, t, tilt, dx, w, we;
951 Double_t uvt[4];
952 Int_t nPoints = 0;
953 // Containers for Least-square fitter
954 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
955 if(!tracklets[ipl].IsOK()) continue;
956 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
957 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
958 if (!tracklets[ipl].IsUsable(itb)) continue;
959 x = cl->GetX();
960 y = cl->GetY();
961 z = cl->GetZ();
962 tilt = tracklets[ipl].GetTilt();
963 dx = x - xref;
964 // Transformation
965 t = 1./(x*x + y*y);
966 uvt[0] = 2. * x * t;
967 uvt[1] = t;
968 uvt[2] = 2. * tilt * t;
969 uvt[3] = 2. * tilt * dx * t;
970 w = 2. * (y + tilt*z) * t;
971 // error definition changes for the different calls
972 we = 2. * t;
973 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
974 fitter->AddPoint(uvt, w, we);
975 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
976 nPoints++;
977 }
978 }
979 fitter->Eval();
980 zfitter.Eval();
981
982 Double_t offset = fitter->GetParameter(3);
983 Double_t slope = fitter->GetParameter(4);
984
985 // Linear fitter - not possible to make boundaries
986 // Do not accept non possible z and dzdx combinations
987 Bool_t acceptablez = kTRUE;
988 Double_t zref = 0.0;
989 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
990 if(!tracklets[iLayer].IsOK()) continue;
991 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
992 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
993 acceptablez = kFALSE;
994 }
995 if (!acceptablez) {
996 Double_t dzmf = zfitter.GetFunctionParameter(1);
997 Double_t zmf = zfitter.GetFunctionValue(&xref);
998 fgTiltedRieman->FixParameter(3, zmf);
999 fgTiltedRieman->FixParameter(4, dzmf);
1000 fitter->Eval();
1001 fitter->ReleaseParameter(3);
1002 fitter->ReleaseParameter(4);
1003 offset = fitter->GetParameter(3);
1004 slope = fitter->GetParameter(4);
1005 }
1006
1007 // Calculate Curvarture
1008 Double_t a = fitter->GetParameter(0);
1009 Double_t b = fitter->GetParameter(1);
1010 Double_t c = fitter->GetParameter(2);
1011 Double_t curvature = 1.0 + b*b - c*a;
1012 if (curvature > 0.0)
1013 curvature = a / TMath::Sqrt(curvature);
1014
1015 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1016
1017 // Update the tracklets
1018 Double_t dy, dz;
1019 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1020
1021 x = tracklets[iLayer].GetX0();
1022 y = 0;
1023 z = 0;
1024 dy = 0;
1025 dz = 0;
1026
1027 // y: R^2 = (x - x0)^2 + (y - y0)^2
1028 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1029 // R = Sqrt() = 1/Curvature
1030 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1031 Double_t res = (x * a + b); // = (x - x0)/y0
1032 res *= res;
1033 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1034 if (res >= 0) {
1035 res = TMath::Sqrt(res);
1036 y = (1.0 - res) / a;
1037 }
1038
1039 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1040 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1041 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1042 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1043 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1044 Double_t x0 = -b / a;
1045 if (-c * a + b * b + 1 > 0) {
1046 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1047 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1048 if (a < 0) yderiv *= -1.0;
1049 dy = yderiv;
1050 }
1051 }
1052 z = offset + slope * (x - xref);
1053 dz = slope;
1054 tracklets[iLayer].SetYref(0, y);
1055 tracklets[iLayer].SetYref(1, dy);
1056 tracklets[iLayer].SetZref(0, z);
1057 tracklets[iLayer].SetZref(1, dz);
1058 tracklets[iLayer].SetC(curvature);
1059 tracklets[iLayer].SetChi2(chi2track);
1060 }
1061
3a039a31 1062/* if(fReconstructor->GetStreamLevel() >=5){
41702fec 1063 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1064 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1065 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1066 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1067 cstreamer << "FitTiltedRieman0"
1068 << "EventNumber=" << eventNumber
1069 << "CandidateNumber=" << candidateNumber
1070 << "xref=" << xref
1071 << "Chi2Z=" << chi2z
1072 << "\n";
3a039a31 1073 }*/
41702fec 1074 return chi2track;
eb38ed55 1075}
1076
3b57a3f7 1077
9e333711 1078//____________________________________________________________________
1079Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1080{
1081 AliTRDLeastSquare yfitter, zfitter;
1082 AliTRDcluster *cl = 0x0;
1083
1084 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1085 if(!tracklets){
1086 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1087 if(!(tracklet = track->GetTracklet(ipl))) continue;
1088 if(!tracklet->IsOK()) continue;
1089 new(&work[ipl]) AliTRDseedV1(*tracklet);
1090 }
1091 tracklets = &work[0];
1092 }
1093
1094 Double_t xref = CalculateReferenceX(tracklets);
1095 Double_t x, y, z, dx, ye, yr, tilt;
1096 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1097 if(!tracklets[ipl].IsOK()) continue;
1098 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1099 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1100 if (!tracklets[ipl].IsUsable(itb)) continue;
1101 x = cl->GetX();
1102 z = cl->GetZ();
1103 dx = x - xref;
1104 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1105 }
1106 }
1107 zfitter.Eval();
1108 Double_t z0 = zfitter.GetFunctionParameter(0);
1109 Double_t dzdx = zfitter.GetFunctionParameter(1);
1110 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1111 if(!tracklets[ipl].IsOK()) continue;
1112 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1113 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1114 if (!tracklets[ipl].IsUsable(itb)) continue;
1115 x = cl->GetX();
1116 y = cl->GetY();
1117 z = cl->GetZ();
1118 tilt = tracklets[ipl].GetTilt();
1119 dx = x - xref;
1120 yr = y + tilt*(z - z0 - dzdx*dx);
1121 // error definition changes for the different calls
1122 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1123 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1124 yfitter.AddPoint(&dx, yr, ye);
1125 }
1126 }
1127 yfitter.Eval();
1128 Double_t y0 = yfitter.GetFunctionParameter(0);
1129 Double_t dydx = yfitter.GetFunctionParameter(1);
1130 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1131
1132 //update track points array
1133 if(np && points){
1134 Float_t xyz[3];
1135 for(int ip=0; ip<np; ip++){
1136 points[ip].GetXYZ(xyz);
1137 xyz[1] = y0 + dydx * (xyz[0] - xref);
1138 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1139 points[ip].SetXYZ(xyz);
1140 }
1141 }
1142 return chi2;
1143}
1144
1145
3b57a3f7 1146//_________________________________________________________________________
1147Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1148{
41702fec 1149 //
1150 // Performs a Riemann fit taking tilting pad correction into account
1151 // The equation of a Riemann circle, where the y position is substituted by the
1152 // measured y-position taking pad tilting into account, has to be transformed
1153 // into a 4-dimensional hyperplane equation
1154 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1155 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1156 // zc: center of the pad row
1157 // zt: z-position of the track
1158 // The z-position of the track is assumed to be linear dependent on the x-position
1159 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1160 // Transformation: u = 2 * x * t
1161 // v = 2 * tan(phiT) * t
1162 // w = 2 * tan(phiT) * (x - xref) * t
1163 // t = 1 / (x^2 + ymeas^2)
1164 // Parameters: a = -1/y0
1165 // b = x0/y0
1166 // c = (R^2 -x0^2 - y0^2)/y0
1167 // d = offset
1168 // e = dz/dx
1169 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1170 // results from the simple riemann fit. Afterwards the fit is redone.
1171 // The curvature is calculated according to the formula:
1172 // curv = a/(1 + b^2 + c*a) = 1/R
1173 //
1174 // Paramters: - Array of tracklets (connected to the track candidate)
1175 // - Flag selecting the error definition
1176 // Output: - Chi2 values of the track (in Parameter list)
1177 //
1178 TLinearFitter *fitter = GetTiltedRiemanFitter();
1179 fitter->StoreData(kTRUE);
1180 fitter->ClearPoints();
1181 AliTRDLeastSquare zfitter;
1182 AliTRDcluster *cl = 0x0;
3b57a3f7 1183
1184 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1185 if(!tracklets){
1186 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1187 if(!(tracklet = track->GetTracklet(ipl))) continue;
1188 if(!tracklet->IsOK()) continue;
1189 new(&work[ipl]) AliTRDseedV1(*tracklet);
1190 }
1191 tracklets = &work[0];
1192 }
1193
41702fec 1194 Double_t xref = CalculateReferenceX(tracklets);
1195 Double_t x, y, z, t, tilt, dx, w, we;
1196 Double_t uvt[4];
1197 Int_t nPoints = 0;
1198 // Containers for Least-square fitter
1199 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1200 if(!tracklets[ipl].IsOK()) continue;
1201 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1202 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1203 if (!tracklets[ipl].IsUsable(itb)) continue;
1204 x = cl->GetX();
1205 y = cl->GetY();
1206 z = cl->GetZ();
1207 tilt = tracklets[ipl].GetTilt();
1208 dx = x - xref;
1209 // Transformation
1210 t = 1./(x*x + y*y);
1211 uvt[0] = 2. * x * t;
1212 uvt[1] = t;
1213 uvt[2] = 2. * tilt * t;
1214 uvt[3] = 2. * tilt * dx * t;
1215 w = 2. * (y + tilt*z) * t;
1216 // error definition changes for the different calls
1217 we = 2. * t;
1218 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1219 fitter->AddPoint(uvt, w, we);
1220 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1221 nPoints++;
1222 }
1223 }
aec26713 1224 if(fitter->Eval()) return 1.E10;
1225
41702fec 1226 Double_t z0 = fitter->GetParameter(3);
1227 Double_t dzdx = fitter->GetParameter(4);
3b57a3f7 1228
1229
1230 // Linear fitter - not possible to make boundaries
1231 // Do not accept non possible z and dzdx combinations
1232 Bool_t accept = kTRUE;
1233 Double_t zref = 0.0;
1234 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1235 if(!tracklets[iLayer].IsOK()) continue;
1236 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1237 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1238 accept = kFALSE;
1239 }
1240 if (!accept) {
41702fec 1241 zfitter.Eval();
3b57a3f7 1242 Double_t dzmf = zfitter.GetFunctionParameter(1);
1243 Double_t zmf = zfitter.GetFunctionValue(&xref);
1244 fitter->FixParameter(3, zmf);
1245 fitter->FixParameter(4, dzmf);
1246 fitter->Eval();
1247 fitter->ReleaseParameter(3);
1248 fitter->ReleaseParameter(4);
1249 z0 = fitter->GetParameter(3); // = zmf ?
1250 dzdx = fitter->GetParameter(4); // = dzmf ?
1251 }
1252
1253 // Calculate Curvature
1254 Double_t a = fitter->GetParameter(0);
1255 Double_t b = fitter->GetParameter(1);
1256 Double_t c = fitter->GetParameter(2);
1257 Double_t y0 = 1. / a;
1258 Double_t x0 = -b * y0;
a015e406 1259 Double_t tmp = y0*y0 + x0*x0 - c*y0;
1260 if(tmp<=0.) return 1.E10;
1261 Double_t R = TMath::Sqrt(tmp);
3b57a3f7 1262 Double_t C = 1.0 + b*b - c*a;
1263 if (C > 0.0) C = a / TMath::Sqrt(C);
1264
1265 // Calculate chi2 of the fit
1266 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1267
1268 // Update the tracklets
1269 if(!track){
1270 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1271 x = tracklets[ip].GetX0();
90cf7133 1272 tmp = R*R-(x-x0)*(x-x0);
a015e406 1273 if(tmp <= 0.) continue;
1274 tmp = TMath::Sqrt(tmp);
3b57a3f7 1275
1276 // y: R^2 = (x - x0)^2 + (y - y0)^2
1277 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1278 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1279 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1280 tracklets[ip].SetYref(1, (x - x0) / tmp);
1281 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1282 tracklets[ip].SetZref(1, dzdx);
1283 tracklets[ip].SetC(C);
1284 tracklets[ip].SetChi2(chi2);
1285 }
1286 }
1287
1288 //update track points array
1289 if(np && points){
1290 Float_t xyz[3];
1291 for(int ip=0; ip<np; ip++){
1292 points[ip].GetXYZ(xyz);
a015e406 1293 xyz[1] = y0 - (y0>0.?1.:-1.)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
3b57a3f7 1294 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1295 points[ip].SetXYZ(xyz);
1296 }
1297 }
1298
3b57a3f7 1299 return chi2;
1300}
1301
1302
1bf51039 1303//____________________________________________________________________
1304Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1305{
1306// Kalman filter implementation for the TRD.
1307// It returns the positions of the fit in the array "points"
1308//
1309// Author : A.Bercuci@gsi.de
1310
1311 //printf("Start track @ x[%f]\n", track->GetX());
1312
1313 //prepare marker points along the track
1314 Int_t ip = np ? 0 : 1;
1315 while(ip<np){
1316 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1317 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1318 ip++;
1319 }
1320 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1321
1322
1323 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1324
1325 //Loop through the TRD planes
1326 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1327 // GET TRACKLET OR BUILT IT
1328 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1329 if(tracklets){
1330 if(!(ptrTracklet = &tracklets[iplane])) continue;
1331 }else{
1332 if(!(ptrTracklet = track->GetTracklet(iplane))){
1333 /*AliTRDtrackerV1 *tracker = 0x0;
1334 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1335 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1336 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1337 continue;
1338 }
1339 }
1340 if(!ptrTracklet->IsOK()) continue;
1341
1342 Double_t x = ptrTracklet->GetX0();
1343
1344 while(ip < np){
1345 //don't do anything if next marker is after next update point.
1346 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1347
1348 //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX());
1349
1350 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1351
1352 Double_t xyz[3]; // should also get the covariance
1353 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1354 ip++;
1355 }
1356 //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1357
1358 //Propagate closer to the next update point
1359 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1360
1361 if(!AdjustSector(track)) return -1;
1362 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1363
1364 //load tracklet to the tracker and the track
1365/* Int_t index;
1366 if((index = FindTracklet(ptrTracklet)) < 0){
1367 ptrTracklet = SetTracklet(&tracklet);
1368 index = fTracklets->GetEntriesFast()-1;
1369 }
1370 track->SetTracklet(ptrTracklet, index);*/
1371
1372
1373 // register tracklet to track with tracklet creation !!
1374 // PropagateBack : loaded tracklet to the tracker and update index
1375 // RefitInward : update index
1376 // MakeTrack : loaded tracklet to the tracker and update index
1377 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1378
1379
1380 //Calculate the mean material budget along the path inside the chamber
1381 Double_t xyz0[3]; track->GetXYZ(xyz0);
1382 Double_t alpha = track->GetAlpha();
1383 Double_t xyz1[3], y, z;
1384 if(!track->GetProlongation(x, y, z)) return -1;
1385 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1386 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1387 xyz1[2] = z;
1388 Double_t param[7];
1389 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
1390 Double_t xrho = param[0]*param[4]; // density*length
1391 Double_t xx0 = param[1]; // radiation length
1392
1393 //Propagate the track
1394 track->PropagateTo(x, xx0, xrho);
1395 if (!AdjustSector(track)) break;
1396
1397 //Update track
1398 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1399 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1400
1401 if(!up) continue;
1402
1403 //Reset material budget if 2 consecutive gold
1404 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1405 } // end planes loop
1406
1407 // extrapolation
1408 while(ip < np){
1409 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1410
1411 Double_t xyz[3]; // should also get the covariance
1412 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1413 ip++;
1414 }
1415
1416 return track->GetChi2();
1417}
3b57a3f7 1418
eb38ed55 1419//_________________________________________________________________________
bb56afff 1420Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
eb38ed55 1421{
41702fec 1422 //
1423 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1424 // A linear dependence on the x-value serves as a model.
1425 // The parameters are related to the tilted Riemann fit.
1426 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1427 // - the offset for the reference x
1428 // - the slope
1429 // - the reference x position
1430 // Output: - The Chi2 value of the track in z-Direction
1431 //
1432 Float_t chi2Z = 0, nLayers = 0;
053767a4 1433 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
41702fec 1434 if(!tracklets[iLayer].IsOK()) continue;
1435 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1436 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1437 nLayers++;
1438 }
1439 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1440 return chi2Z;
eb38ed55 1441}
1442
bccda319 1443//_____________________________________________________________________________
1444Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1445{
41702fec 1446 //
1447 // Starting from current X-position of track <t> this function
1448 // extrapolates the track up to radial position <xToGo>.
1449 // Returns 1 if track reaches the plane, and 0 otherwise
1450 //
bccda319 1451
41702fec 1452 const Double_t kEpsilon = 0.00001;
bccda319 1453
41702fec 1454 // Current track X-position
1455 Double_t xpos = t.GetX();
bccda319 1456
41702fec 1457 // Direction: inward or outward
1458 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
bccda319 1459
41702fec 1460 while (((xToGo - xpos) * dir) > kEpsilon) {
bccda319 1461
41702fec 1462 Double_t xyz0[3];
1463 Double_t xyz1[3];
1464 Double_t param[7];
1465 Double_t x;
1466 Double_t y;
1467 Double_t z;
bccda319 1468
41702fec 1469 // The next step size
1470 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
bccda319 1471
41702fec 1472 // Get the global position of the starting point
1473 t.GetXYZ(xyz0);
bccda319 1474
41702fec 1475 // X-position after next step
1476 x = xpos + step;
bccda319 1477
41702fec 1478 // Get local Y and Z at the X-position of the next step
1479 if (!t.GetProlongation(x,y,z)) {
1480 return 0; // No prolongation possible
1481 }
bccda319 1482
41702fec 1483 // The global position of the end point of this prolongation step
1484 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1485 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1486 xyz1[2] = z;
bccda319 1487
41702fec 1488 // Calculate the mean material budget between start and
1489 // end point of this prolongation step
1490 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
bccda319 1491
41702fec 1492 // Propagate the track to the X-position after the next step
1493 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1494 return 0;
1495 }
bccda319 1496
41702fec 1497 // Rotate the track if necessary
1498 AdjustSector(&t);
bccda319 1499
41702fec 1500 // New track X-position
1501 xpos = t.GetX();
bccda319 1502
41702fec 1503 }
bccda319 1504
41702fec 1505 return 1;
bccda319 1506
1507}
1508
eb38ed55 1509
1510//_____________________________________________________________________________
1511Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1512{
41702fec 1513 //
1514 // Reads AliTRDclusters from the file.
1515 // The names of the cluster tree and branches
1516 // should match the ones used in AliTRDclusterizer::WriteClusters()
1517 //
1518
1519 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1520 TObjArray *clusterArray = new TObjArray(nsize+1000);
1521
1522 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1523 if (!branch) {
1524 AliError("Can't get the branch !");
1525 return 1;
1526 }
1527 branch->SetAddress(&clusterArray);
1528
1529 if(!fClusters){
8ae98148 1530 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1531 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1532 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
41702fec 1533 array->SetOwner(kTRUE);
1534 }
1535
1536 // Loop through all entries in the tree
1537 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1538 Int_t nbytes = 0;
1539 Int_t ncl = 0;
1540 AliTRDcluster *c = 0x0;
1541 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1542 // Import the tree
1543 nbytes += clusterTree->GetEvent(iEntry);
1544
1545 // Get the number of points in the detector
1546 Int_t nCluster = clusterArray->GetEntriesFast();
1547 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1548 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1549 c->SetInChamber();
1550 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1551 delete (clusterArray->RemoveAt(iCluster));
1552 }
1553
1554 }
1555 delete clusterArray;
1556
1557 return 0;
eb38ed55 1558}
1559
1560//_____________________________________________________________________________
1561Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1562{
41702fec 1563 //
66f6bfd9 1564 // Fills clusters into TRD tracking sectors
41702fec 1565 //
41702fec 1566
48f8adf3 1567 if(!fReconstructor->IsWritingClusters()){
1568 fClusters = AliTRDReconstructor::GetClusters();
1569 } else {
66f6bfd9 1570 if (ReadClusters(fClusters, cTree)) {
1571 AliError("Problem with reading the clusters !");
1572 return 1;
1573 }
1574 }
1575 SetClustersOwner();
1576
48f8adf3 1577 if(!fClusters || !fClusters->GetEntriesFast()){
66f6bfd9 1578 AliInfo("No TRD clusters");
41702fec 1579 return 1;
1580 }
66f6bfd9 1581
1582 //Int_t nin =
1583 BuildTrackingContainers();
1584
1585 //Int_t ncl = fClusters->GetEntriesFast();
1586 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1587
1588 return 0;
1589}
1590
1591//_____________________________________________________________________________
1592Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1593{
1594 //
1595 // Fills clusters into TRD tracking sectors
1596 // Function for use in the HLT
1597
1598 if(!clusters || !clusters->GetEntriesFast()){
1599 AliInfo("No TRD clusters");
41702fec 1600 return 1;
1601 }
1602
66f6bfd9 1603 fClusters = clusters;
1604 SetClustersOwner();
1605
1606 //Int_t nin =
1607 BuildTrackingContainers();
1608
1609 //Int_t ncl = fClusters->GetEntriesFast();
1610 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1611
1612 return 0;
1613}
1614
1615
1616//____________________________________________________________________
1617Int_t AliTRDtrackerV1::BuildTrackingContainers()
1618{
1619// Building tracking containers for clusters
1620
1621 Int_t nin =0, icl = fClusters->GetEntriesFast();
41702fec 1622 while (icl--) {
1623 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1624 if(c->IsInChamber()) nin++;
1625 Int_t detector = c->GetDetector();
1626 Int_t sector = fGeom->GetSector(detector);
053767a4 1627 Int_t stack = fGeom->GetStack(detector);
1628 Int_t layer = fGeom->GetLayer(detector);
41702fec 1629
053767a4 1630 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
41702fec 1631 }
b0a48c4d 1632
1633 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
053767a4 1634 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
41702fec 1635 if(!fTrSec[isector].GetNChambers()) continue;
b0a48c4d 1636 fTrSec[isector].Init(fReconstructor, cal);
41702fec 1637 }
66f6bfd9 1638
1639 return nin;
eb38ed55 1640}
1641
1642
66f6bfd9 1643
0906e73e 1644//____________________________________________________________________
1645void AliTRDtrackerV1::UnloadClusters()
1646{
41702fec 1647 //
1648 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1649 //
0906e73e 1650
41702fec 1651 if(fTracks) fTracks->Delete();
1652 if(fTracklets) fTracklets->Delete();
48f8adf3 1653 if(fClusters){
1654 if(IsClustersOwner()) fClusters->Delete();
1655
1656 // save clusters array in the reconstructor for further use.
1657 if(!fReconstructor->IsWritingClusters()){
1658 AliTRDReconstructor::SetClusters(fClusters);
1659 SetClustersOwner(kFALSE);
1660 } else AliTRDReconstructor::SetClusters(0x0);
1661 }
0906e73e 1662
053767a4 1663 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
0906e73e 1664
41702fec 1665 // Increment the Event Number
1666 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
eb38ed55 1667}
0906e73e 1668
eb38ed55 1669//_____________________________________________________________________________
1670Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1671{
41702fec 1672 //
1673 // Rotates the track when necessary
1674 //
1675
1676 Double_t alpha = AliTRDgeometry::GetAlpha();
1677 Double_t y = track->GetY();
1678 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1679
1680 if (y > ymax) {
1681 if (!track->Rotate( alpha)) {
1682 return kFALSE;
1683 }
1684 }
1685 else if (y < -ymax) {
1686 if (!track->Rotate(-alpha)) {
1687 return kFALSE;
1688 }
1689 }
1690
1691 return kTRUE;
0906e73e 1692
1693}
1694
eb38ed55 1695
0906e73e 1696//____________________________________________________________________
1697AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1698{
41702fec 1699 // Find tracklet for TRD track <track>
1700 // Parameters
1701 // - track
1702 // - sector
1703 // - plane
1704 // - index
1705 // Output
1706 // tracklet
1707 // index
1708 // Detailed description
1709 //
1710 idx = track->GetTrackletIndex(p);
1711 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1712
1713 return tracklet;
0906e73e 1714}
1715
1716//____________________________________________________________________
3b57a3f7 1717AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
0906e73e 1718{
41702fec 1719 // Add this tracklet to the list of tracklets stored in the tracker
1720 //
1721 // Parameters
1722 // - tracklet : pointer to the tracklet to be added to the list
1723 //
1724 // Output
1725 // - the index of the new tracklet in the tracker tracklets list
1726 //
1727 // Detailed description
1728 // Build the tracklets list if it is not yet created (late initialization)
1729 // and adds the new tracklet to the list.
1730 //
1731 if(!fTracklets){
053767a4 1732 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
41702fec 1733 fTracklets->SetOwner(kTRUE);
1734 }
1735 Int_t nentries = fTracklets->GetEntriesFast();
1736 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
972ef65e 1737}
1738
d20df6fc 1739//____________________________________________________________________
1740AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1741{
1742 // Add this track to the list of tracks stored in the tracker
1743 //
1744 // Parameters
1745 // - track : pointer to the track to be added to the list
1746 //
1747 // Output
1748 // - the pointer added
1749 //
1750 // Detailed description
1751 // Build the tracks list if it is not yet created (late initialization)
1752 // and adds the new track to the list.
1753 //
1754 if(!fTracks){
053767a4 1755 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
d20df6fc 1756 fTracks->SetOwner(kTRUE);
1757 }
1758 Int_t nentries = fTracks->GetEntriesFast();
1759 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1760}
1761
1762
0906e73e 1763
e4f2f73d 1764//____________________________________________________________________
eb38ed55 1765Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
e4f2f73d 1766{
41702fec 1767 //
1768 // Steer tracking for one SM.
1769 //
1770 // Parameters :
1771 // sector : Array of (SM) propagation layers containing clusters
1772 // esd : The current ESD event. On output it contains the also
1773 // the ESD (TRD) tracks found in this SM.
1774 //
1775 // Output :
1776 // Number of tracks found in this TRD supermodule.
1777 //
1778 // Detailed description
1779 //
1780 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1781 // 2. Launch stack tracking.
1782 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1783 // 3. Pack results in the ESD event.
1784 //
1785
1786 // allocate space for esd tracks in this SM
1787 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1788 esdTrackList.SetOwner();
1789
1790 Int_t nTracks = 0;
1791 Int_t nChambers = 0;
1792 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
053767a4 1793 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
41702fec 1794 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1795 nChambers = 0;
053767a4 1796 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1797 if(!(chamber = stack[ilayer])) continue;
3a039a31 1798 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
41702fec 1799 nChambers++;
053767a4 1800 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
41702fec 1801 }
1802 if(nChambers < 4) continue;
1803 //AliInfo(Form("Doing stack %d", istack));
1804 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1805 }
1806 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1807
1808 for(int itrack=0; itrack<nTracks; itrack++)
1809 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1810
1811 // Reset Track and Candidate Number
1812 AliTRDtrackerDebug::SetCandidateNumber(0);
1813 AliTRDtrackerDebug::SetTrackNumber(0);
1814 return nTracks;
e4f2f73d 1815}
1816
1817//____________________________________________________________________
eb38ed55 1818Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
e4f2f73d 1819{
41702fec 1820 //
1821 // Make tracks in one TRD stack.
1822 //
1823 // Parameters :
1824 // layer : Array of stack propagation layers containing clusters
1825 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1826 // On exit the tracks found in this stack are appended.
1827 //
1828 // Output :
1829 // Number of tracks found in this stack.
1830 //
1831 // Detailed description
1832 //
1833 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1834 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1835 // See AliTRDtrackerV1::MakeSeeds() for more details.
1836 // 3. Arrange track candidates in decreasing order of their quality
1837 // 4. Classify tracks in 5 categories according to:
1838 // a) number of layers crossed
1839 // b) track quality
1840 // 5. Sign clusters by tracks in decreasing order of track quality
1841 // 6. Build AliTRDtrack out of seeding tracklets
1842 // 7. Cook MC label
1843 // 8. Build ESD track and register it to the output list
1844 //
1845
b0a48c4d 1846 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
41702fec 1847 AliTRDtrackingChamber *chamber = 0x0;
1848 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1849 Int_t pars[4]; // MakeSeeds parameters
1850
1851 //Double_t alpha = AliTRDgeometry::GetAlpha();
1852 //Double_t shift = .5 * alpha;
1853 Int_t configs[kNConfigs];
1854
1855 // Build initial seeding configurations
1856 Double_t quality = BuildSeedingConfigs(stack, configs);
3a039a31 1857 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 1858 AliInfo(Form("Plane config %d %d %d Quality %f"
1859 , configs[0], configs[1], configs[2], quality));
1860 }
d931f2aa 1861
41702fec 1862
1863 // Initialize contors
1864 Int_t ntracks, // number of TRD track candidates
1865 ntracks1, // number of registered TRD tracks/iter
1866 ntracks2 = 0; // number of all registered TRD tracks in stack
1867 fSieveSeeding = 0;
d931f2aa 1868
1869 // Get stack index
1870 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1871 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1872 if(!(*cIter)) return ntracks2;
1873 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1874
41702fec 1875 do{
1876 // Loop over seeding configurations
1877 ntracks = 0; ntracks1 = 0;
1878 for (Int_t iconf = 0; iconf<3; iconf++) {
1879 pars[0] = configs[iconf];
1880 pars[1] = ntracks;
d931f2aa 1881 pars[2] = istack;
41702fec 1882 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1883 if(ntracks == kMaxTracksStack) break;
1884 }
3a039a31 1885 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
41702fec 1886
1887 if(!ntracks) break;
1888
1889 // Sort the seeds according to their quality
1890 Int_t sort[kMaxTracksStack];
1891 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1892
1893 // Initialize number of tracks so far and logic switches
1894 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1895 Bool_t signedTrack[kMaxTracksStack];
1896 Bool_t fakeTrack[kMaxTracksStack];
1897 for (Int_t i=0; i<ntracks; i++){
1898 signedTrack[i] = kFALSE;
1899 fakeTrack[i] = kFALSE;
1900 }
1901 //AliInfo("Selecting track candidates ...");
1902
1903 // Sieve clusters in decreasing order of track quality
1904 Double_t trackParams[7];
1905 // AliTRDseedV1 *lseed = 0x0;
1906 Int_t jSieve = 0, candidates;
1907 do{
1908 //AliInfo(Form("\t\tITER = %i ", jSieve));
1909
1910 // Check track candidates
1911 candidates = 0;
1912 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
804bb02e 1913 Int_t trackIndex = sort[itrack];
1914 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
41702fec 1915
1916
804bb02e 1917 // Calculate track parameters from tracklets seeds
804bb02e 1918 Int_t ncl = 0;
1919 Int_t nused = 0;
1920 Int_t nlayers = 0;
1921 Int_t findable = 0;
1922 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1923 Int_t jseed = kNPlanes*trackIndex+jLayer;
1924 if(!sseed[jseed].IsOK()) continue;
1925 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1926
1927 sseed[jseed].UpdateUsed();
1928 ncl += sseed[jseed].GetN2();
1929 nused += sseed[jseed].GetNUsed();
1930 nlayers++;
804bb02e 1931 }
1932
41702fec 1933 // Filter duplicated tracks
1934 if (nused > 30){
1935 //printf("Skip %d nused %d\n", trackIndex, nused);
1936 fakeTrack[trackIndex] = kTRUE;
1937 continue;
1938 }
1939 if (Float_t(nused)/ncl >= .25){
1940 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1941 fakeTrack[trackIndex] = kTRUE;
1942 continue;
1943 }
1944
1945 // Classify tracks
1946 Bool_t skip = kFALSE;
1947 switch(jSieve){
1948 case 0:
1949 if(nlayers < 6) {skip = kTRUE; break;}
1950 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1951 break;
1952
1953 case 1:
1954 if(nlayers < findable){skip = kTRUE; break;}
1955 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1956 break;
1957
1958 case 2:
1959 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1960 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1961 break;
1962
1963 case 3:
1964 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1965 break;
1966
1967 case 4:
1968 if (nlayers == 3){skip = kTRUE; break;}
1969 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1970 break;
1971 }
1972 if(skip){
1973 candidates++;
1974 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1975 continue;
1976 }
1977 signedTrack[trackIndex] = kTRUE;
1978
41702fec 1979
1980 // Sign clusters
1981 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
be24510a 1982 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
41702fec 1983 Int_t jseed = kNPlanes*trackIndex+jLayer;
1984 if(!sseed[jseed].IsOK()) continue;
1985 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1986 sseed[jseed].UseClusters();
1987 if(!cl){
90cf7133 1988 ic = 0;
41702fec 1989 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
1990 clusterIndex = sseed[jseed].GetIndexes(ic);
1991 }
1992 }
1993 if(!cl) continue;
1994
1995
1996 // Build track parameters
1997 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
e79f8eb0 1998/* Int_t idx = 0;
41702fec 1999 while(idx<3 && !lseed->IsOK()) {
2000 idx++;
2001 lseed++;
e79f8eb0 2002 }*/
e79f8eb0 2003 Double_t x = lseed->GetX0();// - 3.5;
41702fec 2004 trackParams[0] = x; //NEW AB
e79f8eb0 2005 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2006 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2007 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
41702fec 2008 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
be24510a 2009 trackParams[5] = lseed->GetC();
41702fec 2010 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2011 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2012
3a039a31 2013 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2014 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2015
2016 Int_t nclusters = 0;
2017 AliTRDseedV1 *dseed[6];
804bb02e 2018
2019 // Build track label - what happens if measured data ???
2020 Int_t labels[1000];
2021 Int_t outlab[1000];
2022 Int_t nlab = 0;
d877f55f 2023
2024 Int_t labelsall[1000];
2025 Int_t nlabelsall = 0;
2026 Int_t naccepted = 0;
2027
804bb02e 2028 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2029 Int_t jseed = kNPlanes*trackIndex+iLayer;
2030 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2031 dseed[iLayer]->SetOwner();
2032 nclusters += sseed[jseed].GetN2();
2033 if(!sseed[jseed].IsOK()) continue;
2034 for(int ilab=0; ilab<2; ilab++){
2035 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2036 labels[nlab] = sseed[jseed].GetLabels(ilab);
2037 nlab++;
2038 }
d877f55f 2039
2040 // Cooking label
2041 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2042 if(!sseed[jseed].IsUsable(itime)) continue;
2043 naccepted++;
2044 Int_t tindex = 0, ilab = 0;
2045 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2046 labelsall[nlabelsall++] = tindex;
2047 ilab++;
2048 }
2049 }
41702fec 2050 }
804bb02e 2051 Freq(nlab,labels,outlab,kFALSE);
2052 Int_t label = outlab[0];
2053 Int_t frequency = outlab[1];
2054 Freq(nlabelsall,labelsall,outlab,kFALSE);
2055 Int_t label1 = outlab[0];
2056 Int_t label2 = outlab[2];
2057 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2058
41702fec 2059 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2060 //AliInfo(Form("Number of clusters %d.", nclusters));
2061 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2062 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2063 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2064 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2065 cstreamer << "Clusters2TracksStack"
2066 << "EventNumber=" << eventNumber
2067 << "TrackNumber=" << trackNumber
2068 << "CandidateNumber=" << candidateNumber
2069 << "Iter=" << fSieveSeeding
2070 << "Like=" << fTrackQuality[trackIndex]
2071 << "S0.=" << dseed[0]
2072 << "S1.=" << dseed[1]
2073 << "S2.=" << dseed[2]
2074 << "S3.=" << dseed[3]
2075 << "S4.=" << dseed[4]
2076 << "S5.=" << dseed[5]
2077 << "p0=" << trackParams[0]
2078 << "p1=" << trackParams[1]
2079 << "p2=" << trackParams[2]
2080 << "p3=" << trackParams[3]
2081 << "p4=" << trackParams[4]
2082 << "p5=" << trackParams[5]
2083 << "p6=" << trackParams[6]
2084 << "Label=" << label
2085 << "Label1=" << label1
2086 << "Label2=" << label2
2087 << "FakeRatio=" << fakeratio
2088 << "Freq=" << frequency
2089 << "Ncl=" << ncl
2090 << "NLayers=" << nlayers
2091 << "Findable=" << findable
41702fec 2092 << "NUsed=" << nused
2093 << "\n";
2094 }
2095
2096 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2097 if(!track){
2098 AliWarning("Fail to build a TRD Track.");
2099 continue;
2100 }
76b60503 2101
41702fec 2102 //AliInfo("End of MakeTrack()");
098c3c3d 2103 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2104 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2105 esdTrack->SetLabel(track->GetLabel());
2106 track->UpdateESDtrack(esdTrack);
41702fec 2107 // write ESD-friends if neccessary
3a039a31 2108 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
41702fec 2109 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2110 calibTrack->SetOwner();
098c3c3d 2111 esdTrack->AddCalibObject(calibTrack);
41702fec 2112 }
41702fec 2113 ntracks1++;
2114 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2115 }
2116
2117 jSieve++;
2118 } while(jSieve<5 && candidates); // end track candidates sieve
2119 if(!ntracks1) break;
2120
2121 // increment counters
2122 ntracks2 += ntracks1;
4302c900 2123
2124 if(fReconstructor->IsHLT()) break;
41702fec 2125 fSieveSeeding++;
2126
2127 // Rebuild plane configurations and indices taking only unused clusters into account
2128 quality = BuildSeedingConfigs(stack, configs);
3a039a31 2129 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
41702fec 2130
2131 for(Int_t ip = 0; ip < kNPlanes; ip++){
2132 if(!(chamber = stack[ip])) continue;
b0a48c4d 2133 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
41702fec 2134 }
2135
3a039a31 2136 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2137 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2138 }
2139 } while(fSieveSeeding<10); // end stack clusters sieve
2140
2141
2142
2143 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2144
2145 return ntracks2;
e4f2f73d 2146}
2147
2148//___________________________________________________________________
eb38ed55 2149Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
e4f2f73d 2150{
41702fec 2151 //
2152 // Assign probabilities to chambers according to their
2153 // capability of producing seeds.
2154 //
2155 // Parameters :
2156 //
2157 // layers : Array of stack propagation layers for all 6 chambers in one stack
2158 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2159 // for details) in the decreasing order of their seeding probabilities.
2160 //
2161 // Output :
2162 //
2163 // Return top configuration quality
2164 //
2165 // Detailed description:
2166 //
2167 // To each chamber seeding configuration (see GetSeedingConfig() for
2168 // the list of all configurations) one defines 2 quality factors:
2169 // - an apriori topological quality (see GetSeedingConfig() for details) and
2170 // - a data quality based on the uniformity of the distribution of
2171 // clusters over the x range (time bins population). See CookChamberQA() for details.
2172 // The overall chamber quality is given by the product of this 2 contributions.
2173 //
2174
2175 Double_t chamberQ[kNPlanes];
2176 AliTRDtrackingChamber *chamber = 0x0;
2177 for(int iplane=0; iplane<kNPlanes; iplane++){
2178 if(!(chamber = stack[iplane])) continue;
2179 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2180 }
2181
2182 Double_t tconfig[kNConfigs];
2183 Int_t planes[4];
2184 for(int iconf=0; iconf<kNConfigs; iconf++){
2185 GetSeedingConfig(iconf, planes);
2186 tconfig[iconf] = fgTopologicQA[iconf];
2187 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2188 }
2189
2190 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2191 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2192 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2193 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2194
2195 return tconfig[configs[0]];
e4f2f73d 2196}
2197
2198//____________________________________________________________________
eb38ed55 2199Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
e4f2f73d 2200{
41702fec 2201 //
2202 // Make tracklet seeds in the TRD stack.
2203 //
2204 // Parameters :
2205 // layers : Array of stack propagation layers containing clusters
2206 // sseed : Array of empty tracklet seeds. On exit they are filled.
2207 // ipar : Control parameters:
2208 // ipar[0] -> seeding chambers configuration
2209 // ipar[1] -> stack index
2210 // ipar[2] -> number of track candidates found so far
2211 //
2212 // Output :
2213 // Number of tracks candidates found.
2214 //
2215 // Detailed description
2216 //
2217 // The following steps are performed:
2218 // 1. Select seeding layers from seeding chambers
2219 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2220 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2221 // this order. The parameters controling the range of accepted clusters in
2222 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2223 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2224 // 4. Initialize seeding tracklets in the seeding chambers.
2225 // 5. Filter 0.
2226 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2227 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2228 // 6. Attach clusters to seeding tracklets and find linear approximation of
2229 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2230 // clusters used by current seeds should not exceed ... (25).
2231 // 7. Filter 1.
2232 // All 4 seeding tracklets should be correctly constructed (see
2233 // AliTRDseedV1::AttachClustersIter())
2234 // 8. Helix fit of the seeding tracklets
2235 // 9. Filter 2.
2236 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2237 // 10. Extrapolation of the helix fit to the other 2 chambers:
2238 // a) Initialization of extrapolation tracklet with fit parameters
2239 // b) Helix fit of tracklets
2240 // c) Attach clusters and linear interpolation to extrapolated tracklets
2241 // d) Helix fit of tracklets
2242 // 11. Improve seeding tracklets quality by reassigning clusters.
2243 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2244 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2245 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2246 // 14. Cooking labels for tracklets. Should be done only for MC
2247 // 15. Register seeds.
2248 //
2249
2250 AliTRDtrackingChamber *chamber = 0x0;
be24510a 2251 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
41702fec 2252 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2253 Int_t ncl, mcl; // working variable for looping over clusters
2254 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2255 // chi2 storage
2256 // chi2[0] = tracklet chi2 on the Z direction
2257 // chi2[1] = tracklet chi2 on the R direction
2258 Double_t chi2[4];
2259
e79f8eb0 2260 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2261 // Positions taken using cosmic data taken with SM3 after rebuild
d931f2aa 2262 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
41702fec 2263
2264 // this should be data member of AliTRDtrack
2265 Double_t seedQuality[kMaxTracksStack];
2266
2267 // unpack control parameters
2268 Int_t config = ipar[0];
2269 Int_t ntracks = ipar[1];
d931f2aa 2270 Int_t istack = ipar[2];
41702fec 2271 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
be24510a 2272 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2273
2274
41702fec 2275 // Init chambers geometry
41702fec 2276 Double_t hL[kNPlanes]; // Tilting angle
2277 Float_t padlength[kNPlanes]; // pad lenghts
2278 AliTRDpadPlane *pp = 0x0;
2279 for(int iplane=0; iplane<kNPlanes; iplane++){
2280 pp = fGeom->GetPadPlane(iplane, istack);
bb79ccd5 2281 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
41702fec 2282 padlength[iplane] = pp->GetLengthIPad();
2283 }
2284
3a039a31 2285 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
41702fec 2286 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2287 }
2288
d931f2aa 2289 // Build seeding layers
d611c74f 2290 ResetSeedTB();
41702fec 2291 Int_t nlayers = 0;
41702fec 2292 for(int isl=0; isl<kNSeedPlanes; isl++){
2293 if(!(chamber = stack[planes[isl]])) continue;
3a039a31 2294 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
41702fec 2295 nlayers++;
41702fec 2296 }
2297 if(nlayers < 4) return 0;
2298
2299
2300 // Start finding seeds
2301 Double_t cond0[4], cond1[4], cond2[4];
2302 Int_t icl = 0;
d611c74f 2303 while((c[3] = (*fSeedTB[3])[icl++])){
41702fec 2304 if(!c[3]) continue;
d611c74f 2305 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2306 fSeedTB[0]->GetClusters(cond0, index, ncl);
41702fec 2307 //printf("Found c[3] candidates 0 %d\n", ncl);
2308 Int_t jcl = 0;
2309 while(jcl<ncl) {
d611c74f 2310 c[0] = (*fSeedTB[0])[index[jcl++]];
41702fec 2311 if(!c[0]) continue;
2312 Double_t dx = c[3]->GetX() - c[0]->GetX();
2313 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2314 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
d611c74f 2315 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2316 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
41702fec 2317 //printf("Found c[0] candidates 1 %d\n", mcl);
2318
2319 Int_t kcl = 0;
2320 while(kcl<mcl) {
d611c74f 2321 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2322 if(!c[1]) continue;
2323 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2324 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2325 //printf("Found c[1] candidate 2 %p\n", c[2]);
2326 if(!c[2]) continue;
2327
2328 // AliInfo("Seeding clusters found. Building seeds ...");
2329 // 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());
2330
804bb02e 2331 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
41702fec 2332
d611c74f 2333 FitRieman(c, chi2);
2334
d931f2aa 2335 AliTRDseedV1 *tseed = &cseed[0];
2336 AliTRDtrackingChamber **cIter = &stack[0];
2337 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2338 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
43d6ad34 2339 tseed->SetTilt(hL[iLayer]);
2340 tseed->SetPadLength(padlength[iLayer]);
3a039a31 2341 tseed->SetReconstructor(fReconstructor);
d931f2aa 2342 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
d611c74f 2343 tseed->Init(GetRiemanFitter());
2344 }
2345
2346 Bool_t isFake = kFALSE;
3a039a31 2347 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2348 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2349 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2350 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2351
2352 Double_t xpos[4];
2353 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2354 Float_t yref[4];
2355 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2356 Int_t ll = c[3]->GetLabel(0);
2357 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2358 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2359 AliRieman *rim = GetRiemanFitter();
2360 TTreeSRedirector &cs0 = *fgDebugStreamer;
2361 cs0 << "MakeSeeds0"
2362 <<"EventNumber=" << eventNumber
2363 <<"CandidateNumber=" << candidateNumber
2364 <<"isFake=" << isFake
2365 <<"config=" << config
2366 <<"label=" << ll
2367 <<"chi2z=" << chi2[0]
2368 <<"chi2y=" << chi2[1]
2369 <<"Y2exp=" << cond2[0]
2370 <<"Z2exp=" << cond2[1]
2371 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2372 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2373 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2374 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2375 <<"yref0=" << yref[0]
2376 <<"yref1=" << yref[1]
2377 <<"yref2=" << yref[2]
2378 <<"yref3=" << yref[3]
2379 <<"c0.=" << c[0]
2380 <<"c1.=" << c[1]
2381 <<"c2.=" << c[2]
2382 <<"c3.=" << c[3]
2383 <<"Seed0.=" << &cseed[planes[0]]
2384 <<"Seed1.=" << &cseed[planes[1]]
2385 <<"Seed2.=" << &cseed[planes[2]]
2386 <<"Seed3.=" << &cseed[planes[3]]
2387 <<"RiemanFitter.=" << rim
2388 <<"\n";
2389 }
3a039a31 2390 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
91834b8d 2391// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
d611c74f 2392 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2393 continue;
2394 }
3a039a31 2395 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
91834b8d 2396// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
d611c74f 2397 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2398 continue;
2399 }
2400 //AliInfo("Passed chi2 filter.");
2401
2402 // try attaching clusters to tracklets
2403 Int_t nUsedCl = 0;
2404 Int_t mlayers = 0;
be24510a 2405 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
d611c74f 2406 Int_t jLayer = planes[iLayer];
2407 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2408 nUsedCl += cseed[jLayer].GetNUsed();
2409 if(nUsedCl > 25) break;
2410 mlayers++;
2411 }
be24510a 2412
2413 if(mlayers < kNSeedPlanes){
2414 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2415 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2416 continue;
2417 }
2418
2419 // temporary exit door for the HLT
4302c900 2420 if(fReconstructor->IsHLT()){
be24510a 2421 // attach clusters to extrapolation chambers
2422 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2423 Int_t jLayer = planesExt[iLayer];
2424 if(!(chamber = stack[jLayer])) continue;
2425 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2426 }
4302c900 2427 fTrackQuality[ntracks] = 1.; // dummy value
2428 ntracks++;
218ba867 2429 if(ntracks == kMaxTracksStack) return ntracks;
4302c900 2430 cseed += 6;
2431 continue;
2432 }
2433
be24510a 2434
d611c74f 2435 // fit tracklets and cook likelihood
2436 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
91834b8d 2437 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
d611c74f 2438
3a039a31 2439 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
d611c74f 2440 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2441 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2442 continue;
2443 }
2444 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2445
2446 // book preliminary results
2447 seedQuality[ntracks] = like;
2448 fSeedLayer[ntracks] = config;/*sLayer;*/
2449
2450 // attach clusters to the extrapolation seeds
d611c74f 2451 Int_t nusedf = 0; // debug value
be24510a 2452 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2453 Int_t jLayer = planesExt[iLayer];
d611c74f 2454 if(!(chamber = stack[jLayer])) continue;
d611c74f 2455
2456 // fit extrapolated seed
2457 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2458 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2459 AliTRDseedV1 pseed = cseed[jLayer];
2460 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2461 cseed[jLayer] = pseed;
2462 nusedf += cseed[jLayer].GetNUsed(); // debug value
2463 FitTiltedRieman(cseed, kTRUE);
2464 }
2465
2466 // AliInfo("Extrapolation done.");
2467 // Debug Stream containing all the 6 tracklets
3a039a31 2468 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2469 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2470 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2471 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2472 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2473 cstreamer << "MakeSeeds1"
2474 << "EventNumber=" << eventNumber
2475 << "CandidateNumber=" << candidateNumber
2476 << "S0.=" << &cseed[0]
2477 << "S1.=" << &cseed[1]
2478 << "S2.=" << &cseed[2]
2479 << "S3.=" << &cseed[3]
2480 << "S4.=" << &cseed[4]
2481 << "S5.=" << &cseed[5]
2482 << "FitterT.=" << tiltedRieman
2483 << "\n";
2484 }
2485
fb872574 2486 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
d611c74f 2487 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2488 continue;
2489 }
2490 //AliInfo("Improve seed quality done.");
2491
2492 // fit full track and cook likelihoods
2493 // Double_t curv = FitRieman(&cseed[0], chi2);
2494 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2495 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2496
2497 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2498 Double_t chi2Vals[3];
2499 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
91834b8d 2500 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
d611c74f 2501 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2502 else
2503 chi2Vals[1] = 1.;
2504 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2505 // Chi2 definitions in testing stage
2506 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2507 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2508 //AliInfo("Hyperplane fit done\n");
2509
2510 // finalize tracklets
2511 Int_t labels[12];
2512 Int_t outlab[24];
2513 Int_t nlab = 0;
2514 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2515 if (!cseed[iLayer].IsOK()) continue;
2516
2517 if (cseed[iLayer].GetLabels(0) >= 0) {
2518 labels[nlab] = cseed[iLayer].GetLabels(0);
2519 nlab++;
2520 }
2521
2522 if (cseed[iLayer].GetLabels(1) >= 0) {
2523 labels[nlab] = cseed[iLayer].GetLabels(1);
2524 nlab++;
2525 }
2526 }
2527 Freq(nlab,labels,outlab,kFALSE);
2528 Int_t label = outlab[0];
2529 Int_t frequency = outlab[1];
2530 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2531 cseed[iLayer].SetFreq(frequency);
2532 cseed[iLayer].SetChi2Z(chi2[1]);
2533 }
2534
3a039a31 2535 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
d611c74f 2536 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2537 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2538 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2539 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2540 TLinearFitter *fitterT = GetTiltedRiemanFitter();
91834b8d 2541 Int_t ncls = 0;
2542 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2543 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2544 }
d611c74f 2545 cstreamer << "MakeSeeds2"
2546 << "EventNumber=" << eventNumber
2547 << "CandidateNumber=" << candidateNumber
2548 << "Chi2TR=" << chi2Vals[0]
2549 << "Chi2TC=" << chi2Vals[1]
2550 << "Nlayers=" << mlayers
91834b8d 2551 << "NClusters=" << ncls
d611c74f 2552 << "NUsedS=" << nUsedCl
2553 << "NUsed=" << nusedf
2554 << "Like=" << like
2555 << "S0.=" << &cseed[0]
2556 << "S1.=" << &cseed[1]
2557 << "S2.=" << &cseed[2]
2558 << "S3.=" << &cseed[3]
2559 << "S4.=" << &cseed[4]
2560 << "S5.=" << &cseed[5]
2561 << "Label=" << label
2562 << "Freq=" << frequency
2563 << "FitterT.=" << fitterT
2564 << "FitterTC.=" << fitterTC
2565 << "\n";
2566 }
2567
2568 ntracks++;
2569 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2570 if(ntracks == kMaxTracksStack){
2571 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2572 return ntracks;
2573 }
2574 cseed += 6;
41702fec 2575 }
2576 }
2577 }
41702fec 2578
2579 return ntracks;
e4f2f73d 2580}
2581
2582//_____________________________________________________________________________
0906e73e 2583AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
e4f2f73d 2584{
41702fec 2585 //
2586 // Build a TRD track out of tracklet candidates
2587 //
2588 // Parameters :
2589 // seeds : array of tracklets
2590 // params : track parameters (see MakeSeeds() function body for a detailed description)
2591 //
2592 // Output :
2593 // The TRD track.
2594 //
2595 // Detailed description
2596 //
2597 // To be discussed with Marian !!
2598 //
2599
41702fec 2600
2601 Double_t alpha = AliTRDgeometry::GetAlpha();
2602 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2603 Double_t c[15];
2604
2605 c[ 0] = 0.2;
2606 c[ 1] = 0.0; c[ 2] = 2.0;
2607 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2608 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2609 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2610
d20df6fc 2611 AliTRDtrackV1 track(seeds, &params[1], c, params[0], params[6]*alpha+shift);
2612 track.PropagateTo(params[0]-5.0);
91834b8d 2613 if(fReconstructor->IsHLT()){
2614 AliTRDseedV1 *ptrTracklet = 0x0;
2615 for(Int_t ip=0; ip<kNPlanes; ip++){
2616 track.UnsetTracklet(ip);
2617 ptrTracklet = SetTracklet(&seeds[ip]);
2618 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2619 }
2620 return SetTrack(&track);
2621 }
393fda1c 2622
d20df6fc 2623 track.ResetCovariance(1);
e79f8eb0 2624 Int_t nc = TMath::Abs(FollowBackProlongation(track));
393fda1c 2625 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2626 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2627 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2628 Double_t p[5]; // Track Params for the Debug Stream
2629 track.GetExternalParameters(params[0], p);
2630 TTreeSRedirector &cs = *fgDebugStreamer;
2631 cs << "MakeTrack"
2632 << "EventNumber=" << eventNumber
2633 << "CandidateNumber=" << candidateNumber
2634 << "nc=" << nc
2635 << "X=" << params[0]
2636 << "Y=" << p[0]
2637 << "Z=" << p[1]
2638 << "snp=" << p[2]
2639 << "tnd=" << p[3]
2640 << "crv=" << p[4]
2641 << "Yin=" << params[1]
2642 << "Zin=" << params[2]
2643 << "snpin=" << params[3]
2644 << "tndin=" << params[4]
2645 << "crvin=" << params[5]
2646 << "track.=" << &track
2647 << "\n";
2648 }
d20df6fc 2649 if (nc < 30) return 0x0;
2650
2651 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
215f7116 2652 ptrTrack->SetReconstructor(fReconstructor);
48f8adf3 2653 ptrTrack->CookLabel(.9);
24253b0a 2654
d20df6fc 2655 // computes PID for track
2656 ptrTrack->CookPID();
2657 // update calibration references using this track
48f8adf3 2658 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2659 if (!calibra){
2660 AliInfo("Could not get Calibra instance\n");
2661 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2662 }
d20df6fc 2663 return ptrTrack;
e4f2f73d 2664}
2665
0906e73e 2666
2667//____________________________________________________________________
eb38ed55 2668Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
e4f2f73d 2669{
41702fec 2670 //
2671 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2672 //
2673 // Parameters :
2674 // layers : Array of propagation layers for a stack/supermodule
2675 // cseed : Array of 6 seeding tracklets which has to be improved
2676 //
2677 // Output :
2678 // cssed : Improved seeds
2679 //
2680 // Detailed description
2681 //
2682 // Iterative procedure in which new clusters are searched for each
2683 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2684 // can be maximized. If some optimization is found the old seeds are replaced.
2685 //
2686 // debug level: 7
2687 //
2688
2689 // make a local working copy
2690 AliTRDtrackingChamber *chamber = 0x0;
2691 AliTRDseedV1 bseed[6];
2692 Int_t nLayers = 0;
2693 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2694
2695 Float_t lastquality = 10000.0;
2696 Float_t lastchi2 = 10000.0;
2697 Float_t chi2 = 1000.0;
2698
2699 for (Int_t iter = 0; iter < 4; iter++) {
2700 Float_t sumquality = 0.0;
2701 Float_t squality[6];
2702 Int_t sortindexes[6];
2703
2704 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
3a039a31 2705 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
41702fec 2706 sumquality += squality[jLayer];
2707 }
2708 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2709
2710 nLayers = 0;
2711 lastquality = sumquality;
2712 lastchi2 = chi2;
2713 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2714
2715 TMath::Sort(6, squality, sortindexes, kFALSE);
2716 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2717 Int_t bLayer = sortindexes[jLayer];
2718 if(!(chamber = stack[bLayer])) continue;
2719 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2720 if(bseed[bLayer].IsOK()) nLayers++;
2721 }
2722
2723 chi2 = FitTiltedRieman(bseed, kTRUE);
3a039a31 2724 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
41702fec 2725 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2726 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2727 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2728 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2729 cstreamer << "ImproveSeedQuality"
2730 << "EventNumber=" << eventNumber
2731 << "CandidateNumber=" << candidateNumber
2732 << "Iteration=" << iter
2733 << "S0.=" << &bseed[0]
2734 << "S1.=" << &bseed[1]
2735 << "S2.=" << &bseed[2]
2736 << "S3.=" << &bseed[3]
2737 << "S4.=" << &bseed[4]
2738 << "S5.=" << &bseed[5]
2739 << "FitterT.=" << tiltedRieman
2740 << "\n";
2741 }
2742 } // Loop: iter
2743
2744 // we are sure that at least 2 tracklets are OK !
2745 return nLayers+2;
e4f2f73d 2746}
2747
eb38ed55 2748//_________________________________________________________________________
2749Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
41702fec 2750 //
2751 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2752 // the track selection
2753 // The likelihood value containes:
2754 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2755 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2756 // For all Parameters an exponential dependency is used
2757 //
2758 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2759 // - Array of chi2 values:
2760 // * Non-Constrained Tilted Riemann fit
2761 // * Vertex-Constrained Tilted Riemann fit
2762 // * z-Direction from Linear fit
2763 // Output: - The calculated track likelihood
2764 //
2765 // debug level 2
2766 //
2767
2768 Double_t sumdaf = 0, nLayers = 0;
2769 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2770 if(!tracklets[iLayer].IsOK()) continue;
2771 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2772 nLayers++;
2773 }
2774 sumdaf /= Float_t (nLayers - 2.0);
2775
2776 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
3a039a31 2777 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
d20df6fc 2778 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
41702fec 2779 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2780 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2781 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2782
3a039a31 2783 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2784 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2785 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2786 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2787 cstreamer << "CalculateTrackLikelihood0"
2788 << "EventNumber=" << eventNumber
2789 << "CandidateNumber=" << candidateNumber
2790 << "LikeChi2Z=" << likeChi2Z
2791 << "LikeChi2TR=" << likeChi2TR
2792 << "LikeChi2TC=" << likeChi2TC
2793 << "LikeAF=" << likeAF
2794 << "TrackLikelihood=" << trackLikelihood
2795 << "\n";
2796 }
2797
2798 return trackLikelihood;
e4f2f73d 2799}
2800
2801//____________________________________________________________________
91834b8d 2802Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
e4f2f73d 2803{
41702fec 2804 //
2805 // Calculate the probability of this track candidate.
2806 //
2807 // Parameters :
2808 // cseeds : array of candidate tracklets
2809 // planes : array of seeding planes (see seeding configuration)
2810 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2811 //
2812 // Output :
2813 // likelihood value
2814 //
2815 // Detailed description
2816 //
2817 // The track quality is estimated based on the following 4 criteria:
2818 // 1. precision of the rieman fit on the Y direction (likea)
2819 // 2. chi2 on the Y direction (likechi2y)
2820 // 3. chi2 on the Z direction (likechi2z)
2821 // 4. number of attached clusters compared to a reference value
2822 // (see AliTRDrecoParam::fkFindable) (likeN)
2823 //
2824 // The distributions for each type of probabilities are given below as of
2825 // (date). They have to be checked to assure consistency of estimation.
2826 //
2827
2828 // ratio of the total number of clusters/track which are expected to be found by the tracker.
91834b8d 2829 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
41702fec 2830
91834b8d 2831 Double_t chi2y = GetChi2Y(&cseed[0]);
2832 Double_t chi2z = GetChi2Z(&cseed[0]);
2833
8ae98148 2834 Float_t nclusters = 0.;
41702fec 2835 Double_t sumda = 0.;
2836 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2837 Int_t jlayer = planes[ilayer];
2838 nclusters += cseed[jlayer].GetN2();
2839 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2840 }
8ae98148 2841 nclusters *= .25;
2842
91834b8d 2843 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiCut());
41702fec 2844 Double_t likechi2y = 0.0000000001;
91834b8d 2845 if (fReconstructor->IsCosmic() || chi2y < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YCut());
2846 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZCut());
8ae98148 2847 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
41702fec 2848 Double_t like = likea * likechi2y * likechi2z * likeN;
2849
2850 // 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 2851 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
41702fec 2852 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2853 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
91834b8d 2854 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2855 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2856 if(!cseed[iseed].IsOK()) continue;
2857 nTracklets++;
2858 mean_ncls += cseed[iseed].GetN2();
2859 }
2860 if(nTracklets) mean_ncls /= nTracklets;
41702fec 2861 // The Debug Stream contains the seed
2862 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2863 cstreamer << "CookLikelihood"
2864 << "EventNumber=" << eventNumber
2865 << "CandidateNumber=" << candidateNumber
2866 << "tracklet0.=" << &cseed[0]
2867 << "tracklet1.=" << &cseed[1]
2868 << "tracklet2.=" << &cseed[2]
2869 << "tracklet3.=" << &cseed[3]
2870 << "tracklet4.=" << &cseed[4]
2871 << "tracklet5.=" << &cseed[5]
2872 << "sumda=" << sumda
91834b8d 2873 << "chi2y=" << chi2y
2874 << "chi2z=" << chi2z
41702fec 2875 << "likea=" << likea
2876 << "likechi2y=" << likechi2y
2877 << "likechi2z=" << likechi2z
2878 << "nclusters=" << nclusters
2879 << "likeN=" << likeN
2880 << "like=" << like
91834b8d 2881 << "meanncls=" << mean_ncls
41702fec 2882 << "\n";
2883 }
2884
2885 return like;
e4f2f73d 2886}
2887
eb38ed55 2888
e4f2f73d 2889
2890//____________________________________________________________________
0906e73e 2891void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
e4f2f73d 2892{
41702fec 2893 //
2894 // Map seeding configurations to detector planes.
2895 //
2896 // Parameters :
2897 // iconfig : configuration index
2898 // planes : member planes of this configuration. On input empty.
2899 //
2900 // Output :
2901 // planes : contains the planes which are defining the configuration
2902 //
2903 // Detailed description
2904 //
2905 // Here is the list of seeding planes configurations together with
2906 // their topological classification:
2907 //
2908 // 0 - 5432 TQ 0
2909 // 1 - 4321 TQ 0
2910 // 2 - 3210 TQ 0
2911 // 3 - 5321 TQ 1
2912 // 4 - 4210 TQ 1
2913 // 5 - 5431 TQ 1
2914 // 6 - 4320 TQ 1
2915 // 7 - 5430 TQ 2
2916 // 8 - 5210 TQ 2
2917 // 9 - 5421 TQ 3
2918 // 10 - 4310 TQ 3
2919 // 11 - 5410 TQ 4
2920 // 12 - 5420 TQ 5
2921 // 13 - 5320 TQ 5
2922 // 14 - 5310 TQ 5
2923 //
2924 // The topologic quality is modeled as follows:
2925 // 1. The general model is define by the equation:
2926 // p(conf) = exp(-conf/2)
2927 // 2. According to the topologic classification, configurations from the same
2928 // class are assigned the agerage value over the model values.
2929 // 3. Quality values are normalized.
2930 //
2931 // The topologic quality distribution as function of configuration is given below:
2932 //Begin_Html
2933 // <img src="gif/topologicQA.gif">
2934 //End_Html
2935 //
2936
2937 switch(iconfig){
2938 case 0: // 5432 TQ 0
2939 planes[0] = 2;
2940 planes[1] = 3;
2941 planes[2] = 4;
2942 planes[3] = 5;
2943 break;
2944 case 1: // 4321 TQ 0
2945 planes[0] = 1;
2946 planes[1] = 2;
2947 planes[2] = 3;
2948 planes[3] = 4;
2949 break;
2950 case 2: // 3210 TQ 0
2951 planes[0] = 0;
2952 planes[1] = 1;
2953 planes[2] = 2;
2954 planes[3] = 3;
2955 break;
2956 case 3: // 5321 TQ 1
2957 planes[0] = 1;
2958 planes[1] = 2;
2959 planes[2] = 3;
2960 planes[3] = 5;
2961 break;
2962 case 4: // 4210 TQ 1
2963 planes[0] = 0;
2964 planes[1] = 1;
2965 planes[2] = 2;
2966 planes[3] = 4;
2967 break;
2968 case 5: // 5431 TQ 1
2969 planes[0] = 1;
2970 planes[1] = 3;
2971 planes[2] = 4;
2972 planes[3] = 5;
2973 break;
2974 case 6: // 4320 TQ 1
2975 planes[0] = 0;
2976 planes[1] = 2;
2977 planes[2] = 3;
2978 planes[3] = 4;
2979 break;
2980 case 7: // 5430 TQ 2
2981 planes[0] = 0;
2982 planes[1] = 3;
2983 planes[2] = 4;
2984 planes[3] = 5;
2985 break;
2986 case 8: // 5210 TQ 2
2987 planes[0] = 0;
2988 planes[1] = 1;
2989 planes[2] = 2;
2990 planes[3] = 5;
2991 break;
2992 case 9: // 5421 TQ 3
2993 planes[0] = 1;
2994 planes[1] = 2;
2995 planes[2] = 4;
2996 planes[3] = 5;
2997 break;
2998 case 10: // 4310 TQ 3
2999 planes[0] = 0;
3000 planes[1] = 1;
3001 planes[2] = 3;
3002 planes[3] = 4;
3003 break;
3004 case 11: // 5410 TQ 4
3005 planes[0] = 0;
3006 planes[1] = 1;
3007 planes[2] = 4;
3008 planes[3] = 5;
3009 break;
3010 case 12: // 5420 TQ 5
3011 planes[0] = 0;
3012 planes[1] = 2;
3013 planes[2] = 4;
3014 planes[3] = 5;
3015 break;
3016 case 13: // 5320 TQ 5
3017 planes[0] = 0;
3018 planes[1] = 2;
3019 planes[2] = 3;
3020 planes[3] = 5;
3021 break;
3022 case 14: // 5310 TQ 5
3023 planes[0] = 0;
3024 planes[1] = 1;
3025 planes[2] = 3;
3026 planes[3] = 5;
3027 break;
3028 }
e4f2f73d 3029}
3030
3031//____________________________________________________________________
0906e73e 3032void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
e4f2f73d 3033{
41702fec 3034 //
3035 // Returns the extrapolation planes for a seeding configuration.
3036 //
3037 // Parameters :
3038 // iconfig : configuration index
3039 // planes : planes which are not in this configuration. On input empty.
3040 //
3041 // Output :
3042 // planes : contains the planes which are not in the configuration
3043 //
3044 // Detailed description
3045 //
3046
3047 switch(iconfig){
3048 case 0: // 5432 TQ 0
3049 planes[0] = 1;
3050 planes[1] = 0;
3051 break;
3052 case 1: // 4321 TQ 0
3053 planes[0] = 5;
3054 planes[1] = 0;
3055 break;
3056 case 2: // 3210 TQ 0
3057 planes[0] = 4;
3058 planes[1] = 5;
3059 break;
3060 case 3: // 5321 TQ 1
3061 planes[0] = 4;
3062 planes[1] = 0;
3063 break;
3064 case 4: // 4210 TQ 1
3065 planes[0] = 5;
3066 planes[1] = 3;
3067 break;
3068 case 5: // 5431 TQ 1
3069 planes[0] = 2;
3070 planes[1] = 0;
3071 break;
3072 case 6: // 4320 TQ 1
3073 planes[0] = 5;
3074 planes[1] = 1;
3075 break;
3076 case 7: // 5430 TQ 2
3077 planes[0] = 2;
3078 planes[1] = 1;
3079 break;
3080 case 8: // 5210 TQ 2
3081 planes[0] = 4;
3082 planes[1] = 3;
3083 break;
3084 case 9: // 5421 TQ 3
3085 planes[0] = 3;
3086 planes[1] = 0;
3087 break;
3088 case 10: // 4310 TQ 3
3089 planes[0] = 5;
3090 planes[1] = 2;
3091 break;
3092 case 11: // 5410 TQ 4
3093 planes[0] = 3;
3094 planes[1] = 2;
3095 break;
3096 case 12: // 5420 TQ 5
3097 planes[0] = 3;
3098 planes[1] = 1;
3099 break;
3100 case 13: // 5320 TQ 5
3101 planes[0] = 4;
3102 planes[1] = 1;
3103 break;
3104 case 14: // 5310 TQ 5
3105 planes[0] = 4;
3106 planes[1] = 2;
3107 break;
3108 }
e4f2f73d 3109}
eb38ed55 3110
3111//____________________________________________________________________
3112AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3113{
41702fec 3114 Int_t ncls = fClusters->GetEntriesFast();
2f7514a6 3115 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
eb38ed55 3116}
3117
bb56afff 3118//____________________________________________________________________
3b57a3f7 3119AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3120{
41702fec 3121 Int_t ntrklt = fTracklets->GetEntriesFast();
2f7514a6 3122 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3b57a3f7 3123}
3124
3125//____________________________________________________________________
3126AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3127{
41702fec 3128 Int_t ntrk = fTracks->GetEntriesFast();
2f7514a6 3129 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3b57a3f7 3130}
3131
3132//____________________________________________________________________
bb56afff 3133Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
41702fec 3134 //
3135 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3136 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3137 // are taken into account
3138 //
3139 // Parameters: - Array of tracklets(AliTRDseedV1)
3140 //
3141 // Output: - The reference x-position(Float_t)
3142 //
3143 Int_t nDistances = 0;
3144 Float_t meanDistance = 0.;
3145 Int_t startIndex = 5;
3146 for(Int_t il =5; il > 0; il--){
3147 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3148 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3149 meanDistance += xdiff;
3150 nDistances++;
3151 }
3152 if(tracklets[il].IsOK()) startIndex = il;
3153 }
3154 if(tracklets[0].IsOK()) startIndex = 0;
3155 if(!nDistances){
3156 // We should normally never get here
3157 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3158 Int_t iok = 0, idiff = 0;
3159 // This attempt is worse and should be avoided:
3160 // check for two chambers which are OK and repeat this without taking the mean value
3161 // Strategy avoids a division by 0;
3162 for(Int_t il = 5; il >= 0; il--){
3163 if(tracklets[il].IsOK()){
3164 xpos[iok] = tracklets[il].GetX0();
3165 iok++;
3166 startIndex = il;
3167 }
3168 if(iok) idiff++; // to get the right difference;
3169 if(iok > 1) break;
3170 }
3171 if(iok > 1){
3172 meanDistance = (xpos[0] - xpos[1])/idiff;
3173 }
3174 else{
3175 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3176 return 331.;
3177 }
3178 }
3179 else{
3180 meanDistance /= nDistances;
3181 }
3182 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
bb56afff 3183}
eb38ed55 3184
3185//_____________________________________________________________________________
3186Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
41702fec 3187 , Int_t *outlist, Bool_t down)
eb38ed55 3188{
41702fec 3189 //
3190 // Sort eleements according occurancy
3191 // The size of output array has is 2*n
3192 //
3193
3194 if (n <= 0) {
3195 return 0;
3196 }
3197
3198 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3199 Int_t *sindexF = new Int_t[2*n];
3200 for (Int_t i = 0; i < n; i++) {
3201 sindexF[i] = 0;
3202 }
3203
3204 TMath::Sort(n,inlist,sindexS,down);
3205
3206 Int_t last = inlist[sindexS[0]];
3207 Int_t val = last;
3208 sindexF[0] = 1;
3209 sindexF[0+n] = last;
3210 Int_t countPos = 0;
3211
3212 // Find frequency
3213 for (Int_t i = 1; i < n; i++) {
3214 val = inlist[sindexS[i]];
3215 if (last == val) {
3216 sindexF[countPos]++;
3217 }
3218 else {
3219 countPos++;
3220 sindexF[countPos+n] = val;
3221 sindexF[countPos]++;
3222 last = val;
3223 }
3224 }
3225 if (last == val) {
3226 countPos++;
3227 }
3228
3229 // Sort according frequency
3230 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3231
3232 for (Int_t i = 0; i < countPos; i++) {
3233 outlist[2*i ] = sindexF[sindexS[i]+n];
3234 outlist[2*i+1] = sindexF[sindexS[i]];
3235 }
3236
3237 delete [] sindexS;
3238 delete [] sindexF;
3239
3240 return countPos;
eb38ed55 3241
3242}
bb56afff 3243
06b32d95 3244
3245//____________________________________________________________________
3246void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec)
3247{
3248 fReconstructor = rec;
3249 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
3250 if(!fgDebugStreamer){
3251 TDirectory *savedir = gDirectory;
3252 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
3253 savedir->cd();
3254 }
3255 }
acd241e9 3256}
3257
bb56afff 3258//_____________________________________________________________________________
3259Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3260{
41702fec 3261 // Chi2 definition on y-direction
3262
3263 Float_t chi2 = 0;
3264 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3265 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3266 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
41702fec 3267 chi2 += distLayer * distLayer;
3268 }
3269 return chi2;
bb56afff 3270}
3271
d611c74f 3272//____________________________________________________________________
3273void AliTRDtrackerV1::ResetSeedTB()
3274{
3275// reset buffer for seeding time bin layers. If the time bin
3276// layers are not allocated this function allocates them
3277
3278 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3279 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3280 else fSeedTB[isl]->Clear();
3281 }
3282}
3283
bb56afff 3284//_____________________________________________________________________________
3285Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3286{
91834b8d 3287 // Calculates normalized chi2 in z-direction
41702fec 3288
3289 Float_t chi2 = 0;
91834b8d 3290 // chi2 = Sum ((z - zmu)/sigma)^2
3291 // Sigma for the z direction is defined as half of the padlength
41702fec 3292 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3293 if(!tracklets[ipl].IsOK()) continue;
91834b8d 3294 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
41702fec 3295 chi2 += distLayer * distLayer;
3296 }
3297 return chi2;
bb56afff 3298}
8acca6a3 3299
3300///////////////////////////////////////////////////////
3301// //
3302// Resources of class AliTRDLeastSquare //
3303// //
3304///////////////////////////////////////////////////////
3305
3306//_____________________________________________________________________________
3307AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
41702fec 3308 //
3309 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3310 //
3311 memset(fParams, 0, sizeof(Double_t) * 2);
3312 memset(fSums, 0, sizeof(Double_t) * 5);
3313 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
8acca6a3 3314
3315}
3316
3317//_____________________________________________________________________________
3318void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3319 //
3320 // Adding Point to the fitter
3321 //
3322 Double_t weight = 1/(sigmaY * sigmaY);
3323 Double_t &xpt = *x;
3324 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3325 fSums[0] += weight;
3326 fSums[1] += weight * xpt;
3327 fSums[2] += weight * y;
3328 fSums[3] += weight * xpt * y;
3329 fSums[4] += weight * xpt * xpt;
3330 fSums[5] += weight * y * y;
8acca6a3 3331}
3332
3333//_____________________________________________________________________________
3334void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
41702fec 3335 //
3336 // Remove Point from the sample
3337 //
3338 Double_t weight = 1/(sigmaY * sigmaY);
3339 Double_t &xpt = *x;
3340 fSums[0] -= weight;
3341 fSums[1] -= weight * xpt;
3342 fSums[2] -= weight * y;
3343 fSums[3] -= weight * xpt * y;
3344 fSums[4] -= weight * xpt * xpt;
3345 fSums[5] -= weight * y * y;
8acca6a3 3346}
3347
3348//_____________________________________________________________________________
3349void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
41702fec 3350 //
3351 // Evaluation of the fit:
3352 // Calculation of the parameters
3353 // Calculation of the covariance matrix
3354 //
3355
3356 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
aec26713 3357 if(denominator==0) return;
3358
41702fec 3359 // for(Int_t isum = 0; isum < 5; isum++)
3360 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3361 // printf("denominator = %f\n", denominator);
3362 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3363 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3364 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3365
3366 // Covariance matrix
3367 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3368 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3369 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
8acca6a3 3370}
3371
46b6abd7 3372//_____________________________________________________________________________
3373Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
41702fec 3374 //
3375 // Returns the Function value of the fitted function at a given x-position
3376 //
3377 return fParams[0] + fParams[1] * (*xpos);
46b6abd7 3378}
3379
3380//_____________________________________________________________________________
3381void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
41702fec 3382 //
3383 // Copies the values of the covariance matrix into the storage
3384 //
3385 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
46b6abd7 3386}
3387