/**************************************************************************
- * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
- * *
- * Author: The ALICE Off-line Project. *
- * Contributors are mentioned in the code where appropriate. *
- * *
- * Permission to use, copy, modify and distribute this software and its *
- * documentation strictly for non-commercial purposes is hereby granted *
- * without fee, provided that the above copyright notice appears in all *
- * copies and that both the copyright notice and this permission notice *
- * appear in the supporting documentation. The authors make no claims *
- * about the suitability of this software for any purpose. It is *
- * provided "as is" without express or implied warranty. *
- **************************************************************************/
+* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+* *
+* Author: The ALICE Off-line Project. *
+* Contributors are mentioned in the code where appropriate. *
+* *
+* Permission to use, copy, modify and distribute this software and its *
+* documentation strictly for non-commercial purposes is hereby granted *
+* without fee, provided that the above copyright notice appears in all *
+* copies and that both the copyright notice and this permission notice *
+* appear in the supporting documentation. The authors make no claims *
+* about the suitability of this software for any purpose. It is *
+* provided "as is" without express or implied warranty. *
+**************************************************************************/
/* $Id$ */
const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
- 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
- 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
- 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
+ 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
+ 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
+ 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
};
Int_t AliTRDtrackerV1::fgNTimeBins = 0;
TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
//____________________________________________________________________
AliTRDtrackerV1::AliTRDtrackerV1()
- :AliTracker()
- ,fGeom(new AliTRDgeometry())
- ,fClusters(0x0)
- ,fTracklets(0x0)
- ,fTracks(0x0)
- ,fSieveSeeding(0)
+ :AliTracker()
+ ,fGeom(new AliTRDgeometry())
+ ,fClusters(0x0)
+ ,fTracklets(0x0)
+ ,fTracks(0x0)
+ ,fSieveSeeding(0)
{
- //
- // Default constructor.
- //
- if (!AliTRDcalibDB::Instance()) {
- AliFatal("Could not get calibration object");
- }
- fgNTimeBins = AliTRDcalibDB::Instance()->GetNumberOfTimeBins();
+ //
+ // Default constructor.
+ //
+ if (!AliTRDcalibDB::Instance()) {
+ AliFatal("Could not get calibration object");
+ }
+ fgNTimeBins = AliTRDcalibDB::Instance()->GetNumberOfTimeBins();
for (Int_t isector = 0; isector < AliTRDgeometry::kNsect; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
-
- if(AliTRDReconstructor::StreamLevel() > 1){
+
+ if(AliTRDReconstructor::StreamLevel() > 1){
TDirectory *savedir = gDirectory;
- fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
- savedir->cd();
+ fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
+ savedir->cd();
}
}
//____________________________________________________________________
AliTRDtrackerV1::~AliTRDtrackerV1()
{
- //
- // Destructor
- //
+ //
+ // Destructor
+ //
if(fgDebugStreamer) delete fgDebugStreamer;
if(fgRieman) delete fgRieman;
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
{
- //
- // Steering stand alone tracking for full TRD detector
- //
- // Parameters :
- // esd : The ESD event. On output it contains
- // the ESD tracks found in TRD.
- //
- // Output :
- // Number of tracks found in the TRD detector.
- //
- // Detailed description
- // 1. Launch individual SM trackers.
- // See AliTRDtrackerV1::Clusters2TracksSM() for details.
- //
+ //
+ // Steering stand alone tracking for full TRD detector
+ //
+ // Parameters :
+ // esd : The ESD event. On output it contains
+ // the ESD tracks found in TRD.
+ //
+ // Output :
+ // Number of tracks found in the TRD detector.
+ //
+ // Detailed description
+ // 1. Launch individual SM trackers.
+ // See AliTRDtrackerV1::Clusters2TracksSM() for details.
+ //
if(!AliTRDReconstructor::RecoParam()){
AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
//AliInfo("Start Track Finder ...");
Int_t ntracks = 0;
for(int ism=0; ism<AliTRDgeometry::kNsect; ism++){
-// for(int ism=1; ism<2; ism++){
- //AliInfo(Form("Processing supermodule %i ...", ism));
- ntracks += Clusters2TracksSM(ism, esd);
+ // for(int ism=1; ism<2; ism++){
+ //AliInfo(Form("Processing supermodule %i ...", ism));
+ ntracks += Clusters2TracksSM(ism, esd);
}
- AliInfo(Form("Number of found tracks : %d", ntracks));
+ AliInfo(Form("Number of found tracks : %d", ntracks));
return ntracks;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
{
- //
- // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
- // backpropagated by the TPC tracker. Each seed is first propagated
- // to the TRD, and then its prolongation is searched in the TRD.
- // If sufficiently long continuation of the track is found in the TRD
- // the track is updated, otherwise it's stored as originaly defined
- // by the TPC tracker.
- //
-
+ //
+ // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
+ // backpropagated by the TPC tracker. Each seed is first propagated
+ // to the TRD, and then its prolongation is searched in the TRD.
+ // If sufficiently long continuation of the track is found in the TRD
+ // the track is updated, otherwise it's stored as originaly defined
+ // by the TPC tracker.
+ //
+
+ // Calibration monitor
+ AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
+ if (!calibra) AliInfo("Could not get Calibra instance\n");
+
Int_t found = 0; // number of tracks found
Float_t foundMin = 20.0;
TMath::Sort(nSeed,quality,index,kFALSE);
// Backpropagate all seeds
+ Int_t expectedClr;
+ AliTRDtrackV1 track;
for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
// Get the seeds in sorted sequence
// Do the back prolongation
Int_t lbl = seed->GetLabel();
- AliTRDtrackV1 *track = new AliTRDtrackV1(*seed);
- //track->Print();
- track->SetSeedLabel(lbl);
- seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); // Make backup
- Float_t p4 = track->GetC();
- Int_t expectedClr = FollowBackProlongation(*track);
- //AliInfo(Form("\nTRACK %d Clusters %d [%d] in chi2 %f", index[iSeed], expectedClr, track->GetNumberOfClusters(), track->GetChi2()));
+ new(&track) AliTRDtrackV1(*seed);
//track->Print();
+ track.SetSeedLabel(lbl);
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); // Make backup
+ Float_t p4 = track.GetC();
+ if((expectedClr = FollowBackProlongation(track))){
+ // computes PID for track
+ track.CookPID();
+ // update calibration references using this track
+ if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
+ // save calibration object
+ if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
+
+ track.UpdateESDtrack(seed);
+
+ // Add TRD track to ESDfriendTrack
+ if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
+ AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
+ calibTrack->SetOwner();
+ seed->AddCalibObject(calibTrack);
+ }
+ }
+ }
- //Double_t cov[15];
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 0", index[iSeed], cov[0], cov[2]));
-
- if ((TMath::Abs(track->GetC() - p4) / TMath::Abs(p4) < 0.2) ||
- (track->Pt() > 0.8)) {
+ if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
//
// Make backup for back propagation
//
- Int_t foundClr = track->GetNumberOfClusters();
+ Int_t foundClr = track.GetNumberOfClusters();
if (foundClr >= foundMin) {
//AliInfo(Form("Making backup track ncls [%d]...", foundClr));
- track->CookdEdx();
- track->CookdEdxTimBin(seed->GetID()); // A.Bercuci 25.07.07
- track->CookLabel(1. - fgkLabelFraction);
- if (track->GetBackupTrack()) UseClusters(track->GetBackupTrack());
+ track.CookdEdx();
+ track.CookdEdxTimBin(seed->GetID());
+ track.CookLabel(1. - fgkLabelFraction);
+ if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
-
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 0 test", index[iSeed], cov[0], cov[2]));
// Sign only gold tracks
- if (track->GetChi2() / track->GetNumberOfClusters() < 4) {
- if ((seed->GetKinkIndex(0) == 0) &&
- (track->Pt() < 1.5)) UseClusters(track);
+ if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
+ if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
}
Bool_t isGold = kFALSE;
// Full gold track
- if (track->GetChi2() / track->GetNumberOfClusters() < 5) {
- if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
+ if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
+ if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
isGold = kTRUE;
}
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 00", index[iSeed], cov[0], cov[2]));
// Almost gold track
- if ((!isGold) && (track->GetNCross() == 0) &&
- (track->GetChi2() / track->GetNumberOfClusters() < 7)) {
+ if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
//seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
- if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
-
+ if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
+
isGold = kTRUE;
}
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 01", index[iSeed], cov[0], cov[2]));
- if ((!isGold) && (track->GetBackupTrack())) {
- if ((track->GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track->GetBackupTrack()->GetChi2()/(track->GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
- seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup);
+ if ((!isGold) && (track.GetBackupTrack())) {
+ if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
+ seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
isGold = kTRUE;
}
}
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 02", index[iSeed], cov[0], cov[2]));
//if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
- //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
+ //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
//}
}
}
- /**/
-
- /**/
- // Debug part of tracking
-/* TTreeSRedirector &cstream = *fgDebugStreamer;
- Int_t eventNrInFile = event->GetEventNumberInFile(); // This is most likely NOT the event number you'd like to use. It has nothing to do with the 'real' event number.
- if (AliTRDReconstructor::StreamLevel() > 0) {
- if (track->GetBackupTrack()) {
- cstream << "Tracks"
- << "EventNrInFile=" << eventNrInFile
- << "ESD.=" << seed
- << "trd.=" << track
- << "trdback.=" << track->GetBackupTrack()
- << "\n";
- }
- else {
- cstream << "Tracks"
- << "EventNrInFile=" << eventNrInFile
- << "ESD.=" << seed
- << "trd.=" << track
- << "trdback.=" << track
- << "\n";
- }
- }*/
- /**/
-
- //seed->GetExternalCovariance(cov);
- //AliInfo(Form("track %d cov[%f %f] 1", index[iSeed], cov[0], cov[2]));
-
+
// Propagation to the TOF (I.Belikov)
- if (track->GetStop() == kFALSE) {
- //AliInfo("Track not stopped in TRD ...");
+ if (track.GetStop() == kFALSE) {
Double_t xtof = 371.0;
Double_t xTOF0 = 370.0;
- Double_t c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX());
- if (TMath::Abs(c2) >= 0.99) {
- delete track;
- continue;
- }
+ Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
+ if (TMath::Abs(c2) >= 0.99) continue;
- PropagateToX(*track,xTOF0,fgkMaxStep);
+ PropagateToX(track, xTOF0, fgkMaxStep);
// Energy losses taken to the account - check one more time
- c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX());
- if (TMath::Abs(c2) >= 0.99) {
- delete track;
- continue;
- }
+ c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
+ if (TMath::Abs(c2) >= 0.99) continue;
//if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
// fHBackfit->Fill(7);
Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
Double_t y;
- track->GetYAt(xtof,GetBz(),y);
+ track.GetYAt(xtof,GetBz(),y);
if (y > ymax) {
- if (!track->Rotate( AliTRDgeometry::GetAlpha())) {
- delete track;
- continue;
- }
+ if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
}else if (y < -ymax) {
- if (!track->Rotate(-AliTRDgeometry::GetAlpha())) {
- delete track;
- continue;
- }
+ if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
}
- if (track->PropagateTo(xtof)) {
- //AliInfo("set kTRDout");
- seed->UpdateTrackParams(track,AliESDtrack::kTRDout);
-
- for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) {
- for (Int_t j = 0; j < AliESDtrack::kNSlice; j++) {
- seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j);
- }
- seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
- }
- //seed->SetTRDtrack(new AliTRDtrack(*track));
- if (track->GetNumberOfClusters() > foundMin) found++;
+ if (track.PropagateTo(xtof)) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
+ track.UpdateESDtrack(seed);
+
+ // Add TRD track to ESDfriendTrack
+// if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
+// AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
+// calibTrack->SetOwner();
+// seed->AddCalibObject(calibTrack);
+// }
+ found++;
}
- } else {
- //AliInfo("Track stopped in TRD ...");
-
- if ((track->GetNumberOfClusters() > 15) &&
- (track->GetNumberOfClusters() > 0.5*expectedClr)) {
- seed->UpdateTrackParams(track,AliESDtrack::kTRDout);
-
- //seed->SetStatus(AliESDtrack::kTRDStop);
- for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) {
- for (Int_t j = 0; j <AliESDtrack::kNSlice; j++) {
- seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j);
- }
- seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
- }
- //seed->SetTRDtrack(new AliTRDtrack(*track));
+ } else {
+ if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
+
+ track.UpdateESDtrack(seed);
+
+ // Add TRD track to ESDfriendTrack
+// if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
+// AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
+// calibTrack->SetOwner();
+// seed->AddCalibObject(calibTrack);
+// }
found++;
}
}
-
- //if (((t->GetStatus()&AliESDtrack::kTRDout)!=0 )
- seed->SetTRDQuality(track->StatusForTOF());
- seed->SetTRDBudget(track->GetBudget(0));
- delete track;
+ seed->SetTRDQuality(track.StatusForTOF());
+ seed->SetTRDBudget(track.GetBudget(0));
}
delete [] index;
delete [] quality;
- return 0;
+ return 0;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
{
- //
- // Refits tracks within the TRD. The ESD event is expected to contain seeds
- // at the outer part of the TRD.
- // The tracks are propagated to the innermost time bin
- // of the TRD and the ESD event is updated
- // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
- //
-
- Int_t nseed = 0; // contor for loaded seeds
- Int_t found = 0; // contor for updated TRD tracks
-
- // Calibration monitor
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
- if (!calibra) AliInfo("Could not get Calibra instance\n");
-
-
- AliTRDtrackV1 track;
- for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
- AliESDtrack *seed = event->GetTrack(itrack);
+ //
+ // Refits tracks within the TRD. The ESD event is expected to contain seeds
+ // at the outer part of the TRD.
+ // The tracks are propagated to the innermost time bin
+ // of the TRD and the ESD event is updated
+ // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
+ //
+
+ Int_t nseed = 0; // contor for loaded seeds
+ Int_t found = 0; // contor for updated TRD tracks
+
+
+ AliTRDtrackV1 track;
+ for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
+ AliESDtrack *seed = event->GetTrack(itrack);
new(&track) AliTRDtrackV1(*seed);
- if (track.GetX() < 270.0) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
- //AliInfo(Form("Remove for X = %7.3f [270.]\n", track.GetX()));
+ if (track.GetX() < 270.0) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
continue;
- }
+ }
- ULong_t status = seed->GetStatus();
- if((status & AliESDtrack::kTRDout) == 0) continue;
- if((status & AliESDtrack::kTRDin) != 0) continue;
- nseed++;
+ ULong_t status = seed->GetStatus();
+ if((status & AliESDtrack::kTRDout) == 0) continue;
+ if((status & AliESDtrack::kTRDin) != 0) continue;
+ nseed++;
- track.ResetCovariance(50.0);
+ track.ResetCovariance(50.0);
// do the propagation and processing
- Bool_t kUPDATE = kFALSE;
+ Bool_t kUPDATE = kFALSE;
Double_t xTPC = 250.0;
- if(FollowProlongation(track)){
- // computes PID for track
- track.CookPID();
- // update calibration references using this track
- if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
-
+ if(FollowProlongation(track)){
// Prolongate to TPC
if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
- track.UpdateESDtrack(seed);
- // Add TRD track to ESDfriendTrack
- if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
- AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
- calibTrack->SetOwner();
- seed->AddCalibObject(calibTrack);
- }
- found++;
- kUPDATE = kTRUE;
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
+ found++;
+ kUPDATE = kTRUE;
}
}
// Prolongate to TPC without update
if(!kUPDATE) {
- AliTRDtrackV1 tt(*seed);
- if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
- }
- }
- AliInfo(Form("Number of loaded seeds: %d",nseed));
- AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
-
+ AliTRDtrackV1 tt(*seed);
+ if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
+ }
+ }
+ AliInfo(Form("Number of loaded seeds: %d",nseed));
+ AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
+
return 0;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
{
-// Extrapolates the TRD track in the TPC direction.
-//
-// Parameters
-// t : the TRD track which has to be extrapolated
-//
-// Output
-// number of clusters attached to the track
-//
-// Detailed description
-//
-// Starting from current radial position of track <t> this function
-// extrapolates the track through the 6 TRD layers. The following steps
-// are being performed for each plane:
-// 1. prepare track:
-// a. get plane limits in the local x direction
-// b. check crossing sectors
-// c. check track inclination
-// 2. search tracklet in the tracker list (see GetTracklet() for details)
-// 3. evaluate material budget using the geo manager
-// 4. propagate and update track using the tracklet information.
-//
-// Debug level 2
-//
-
- //AliInfo("");
+ // Extrapolates the TRD track in the TPC direction.
+ //
+ // Parameters
+ // t : the TRD track which has to be extrapolated
+ //
+ // Output
+ // number of clusters attached to the track
+ //
+ // Detailed description
+ //
+ // Starting from current radial position of track <t> this function
+ // extrapolates the track through the 6 TRD layers. The following steps
+ // are being performed for each plane:
+ // 1. prepare track:
+ // a. get plane limits in the local x direction
+ // b. check crossing sectors
+ // c. check track inclination
+ // 2. search tracklet in the tracker list (see GetTracklet() for details)
+ // 3. evaluate material budget using the geo manager
+ // 4. propagate and update track using the tracklet information.
+ //
+ // Debug level 2
+ //
+
Int_t nClustersExpected = 0;
Int_t lastplane = 5; //GetLastPlane(&t);
for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
- Int_t index = 0;
- AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
+ Int_t index = 0;
+ AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
if(!tracklet) continue;
if(!tracklet->IsOK()) AliWarning("tracklet not OK");
+ Double_t x = tracklet->GetX0();
+ // reject tracklets which are not considered for inward refit
+ if(x > t.GetX()+fgkMaxStep) continue;
+
+ // append tracklet to track
t.SetTracklet(tracklet, iplane, index);
- Double_t x = tracklet->GetX0();
- if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
- if (!AdjustSector(&t)) break;
-
- // Start global position
- Double_t xyz0[3];
- t.GetXYZ(xyz0);
+ if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
+ if (!AdjustSector(&t)) break;
+
+ // Start global position
+ Double_t xyz0[3];
+ t.GetXYZ(xyz0);
// End global position
- Double_t alpha = t.GetAlpha(), y, z;
- if (!t.GetProlongation(x,y,z)) break;
- Double_t xyz1[3];
- xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
- xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
- xyz1[2] = z;
+ Double_t alpha = t.GetAlpha(), y, z;
+ if (!t.GetProlongation(x,y,z)) break;
+ Double_t xyz1[3];
+ xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
+ xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
+ xyz1[2] = z;
- // Get material budget
- Double_t param[7];
- AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
- Double_t xrho= param[0]*param[4];
- Double_t xx0 = param[1]; // Get mean propagation parameters
+ // Get material budget
+ Double_t param[7];
+ AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
+ Double_t xrho= param[0]*param[4];
+ Double_t xx0 = param[1]; // Get mean propagation parameters
- // Propagate and update
+ // Propagate and update
t.PropagateTo(x, xx0, xrho);
- if (!AdjustSector(&t)) break;
-
- Double_t maxChi2 = t.GetPredictedChi2(tracklet);
- if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
- nClustersExpected += tracklet->GetN();
- }
- }
+ if (!AdjustSector(&t)) break;
+
+ Double_t maxChi2 = t.GetPredictedChi2(tracklet);
+ if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
+ nClustersExpected += tracklet->GetN();
+ }
+ }
if(AliTRDReconstructor::StreamLevel() > 1){
Int_t index;
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
TTreeSRedirector &cstreamer = *fgDebugStreamer;
cstreamer << "FollowProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &t
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "ncl=" << nClustersExpected
+ << "track.=" << &t
+ << "\n";
}
- return nClustersExpected;
+ return nClustersExpected;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
{
-// Extrapolates the TRD track in the TOF direction.
-//
-// Parameters
-// t : the TRD track which has to be extrapolated
-//
-// Output
-// number of clusters attached to the track
-//
-// Detailed description
-//
-// Starting from current radial position of track <t> this function
-// extrapolates the track through the 6 TRD layers. The following steps
-// are being performed for each plane:
-// 1. prepare track:
-// a. get plane limits in the local x direction
-// b. check crossing sectors
-// c. check track inclination
-// 2. build tracklet (see AliTRDseed::AttachClusters() for details)
-// 3. evaluate material budget using the geo manager
-// 4. propagate and update track using the tracklet information.
-//
-// Debug level 2
-//
+ // Extrapolates the TRD track in the TOF direction.
+ //
+ // Parameters
+ // t : the TRD track which has to be extrapolated
+ //
+ // Output
+ // number of clusters attached to the track
+ //
+ // Detailed description
+ //
+ // Starting from current radial position of track <t> this function
+ // extrapolates the track through the 6 TRD layers. The following steps
+ // are being performed for each plane:
+ // 1. prepare track:
+ // a. get plane limits in the local x direction
+ // b. check crossing sectors
+ // c. check track inclination
+ // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
+ // 3. evaluate material budget using the geo manager
+ // 4. propagate and update track using the tracklet information.
+ //
+ // Debug level 2
+ //
Int_t nClustersExpected = 0;
- Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
- AliTRDtrackingChamber *chamber = 0x0;
-
- // Loop through the TRD planes
- for (Int_t iplane = 0; iplane < AliTRDgeometry::Nplan(); iplane++) {
+ Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
+ AliTRDtrackingChamber *chamber = 0x0;
+
+ // Loop through the TRD planes
+ for (Int_t iplane = 0; iplane < AliTRDgeometry::Nplan(); iplane++) {
// BUILD TRACKLET IF NOT ALREADY BUILT
Double_t x = 0., y, z, alpha;
- AliTRDseedV1 tracklet(*t.GetTracklet(iplane));
+ AliTRDseedV1 tracklet(*t.GetTracklet(iplane));
if(!tracklet.IsOK()){
- alpha = t.GetAlpha();
- Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsect));
+ alpha = t.GetAlpha();
+ Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsect));
- if(!fTrSec[sector].GetNChambers()) continue;
-
- if((x = fTrSec[sector].GetX(iplane)) < 1.) continue;
+ if(!fTrSec[sector].GetNChambers()) continue;
+
+ if((x = fTrSec[sector].GetX(iplane)) < 1.) continue;
if (!t.GetProlongation(x, y, z)) break;
Int_t stack = fGeom->GetChamber(z, iplane);
tracklet.SetPadLength(pp->GetLengthIPad());
tracklet.SetPlane(iplane);
tracklet.SetX0(x);
- tracklet.Init(&t);
+ if(!tracklet.Init(&t)){
+ t.SetStop(kTRUE);
+ return nClustersExpected;
+ }
if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
tracklet.Init(&t);
-
- if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
+
+ if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
break;
}
}
- if(!tracklet.IsOK()){
+ if(!tracklet.IsOK()){
if(x < 1.) continue; //temporary
if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
if(!AdjustSector(&t)) break;
if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
- continue;
- }
-
+ continue;
+ }
+
// Propagate closer to the current chamber if neccessary
- x -= clength;
- if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
- if (!AdjustSector(&t)) break;
- if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
+ x -= clength;
+ if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
+ if (!AdjustSector(&t)) break;
+ if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
// load tracklet to the tracker and the track
Int_t index = SetTracklet(&tracklet);
t.SetTracklet(&tracklet, iplane, index);
-
-
+
+
// Calculate the mean material budget along the path inside the chamber
- //Calculate global entry and exit positions of the track in chamber (only track prolongation)
- Double_t xyz0[3]; // entry point
+ //Calculate global entry and exit positions of the track in chamber (only track prolongation)
+ Double_t xyz0[3]; // entry point
t.GetXYZ(xyz0);
alpha = t.GetAlpha();
x = tracklet.GetX0();
if (!t.GetProlongation(x, y, z)) break;
Double_t xyz1[3]; // exit point
xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
- xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
- xyz1[2] = z;
- Double_t param[7];
+ xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ Double_t param[7];
AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
- // The mean propagation parameters
- Double_t xrho = param[0]*param[4]; // density*length
- Double_t xx0 = param[1]; // radiation length
+ // The mean propagation parameters
+ Double_t xrho = param[0]*param[4]; // density*length
+ Double_t xx0 = param[1]; // radiation length
// Propagate and update track
t.PropagateTo(x, xx0, xrho);
- if (!AdjustSector(&t)) break;
+ if (!AdjustSector(&t)) break;
Double_t maxChi2 = t.GetPredictedChi2(&tracklet);
if (maxChi2<1e+10 && t.Update(&tracklet, maxChi2)){
nClustersExpected += tracklet.GetN();
+ t.SetTracklet(&tracklet, iplane, index);
+ UpdateTracklet(&tracklet, index);
}
// Reset material budget if 2 consecutive gold
if(iplane>0 && tracklet.GetN() + t.GetTracklet(iplane-1)->GetN() > 20) t.SetBudget(2, 0.);
// consider comparison with fTimeBinsRange
Float_t ratio0 = tracklet.GetN() / Float_t(fgNTimeBins);
//Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
- //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
+ //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
//printf("ratio0 %f [> 0.8]\n", ratio0);
//printf("ratio1 %f [> 0.6]\n", ratio1);
//printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
//printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
//printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
//printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
-
+
if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
- (ratio0 > 0.8) &&
- //(ratio1 > 0.6) &&
- //(ratio0+ratio1 > 1.5) &&
- (t.GetNCross() == 0) &&
- (TMath::Abs(t.GetSnp()) < 0.85) &&
- (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
+ (ratio0 > 0.8) &&
+ //(ratio1 > 0.6) &&
+ //(ratio0+ratio1 > 1.5) &&
+ (t.GetNCross() == 0) &&
+ (TMath::Abs(t.GetSnp()) < 0.85) &&
+ (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
} // end planes loop
TTreeSRedirector &cstreamer = *fgDebugStreamer;
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
cstreamer << "FollowBackProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &t
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "ncl=" << nClustersExpected
+ << "track.=" << &t
+ << "\n";
}
return nClustersExpected;
}
-//_____________________________________________________________________________
-void AliTRDtrackerV1::FitLeastSquare(Int_t nPoints, Float_t *x, Float_t *y, Float_t *error, Float_t *fitparams){
-//
-// Performing a least square fit
-//
-// Parameters: - Number of Points
-// - x-data (array)
-// - y-data (array)
-// - error assumption in y-coordinate
-// - fitparams (array with length 2, as output)
-// Output: -
-//
-// The first entry in fitparams is the offset, the second entry the slope
-//
-// @TODO: Implement error paramterisation
-//
- Float_t sumweights = 0,
- sumx = 0,
- sumy = 0,
- sumxy = 0,
- sumx2 = 0;
- for(Int_t ipt = 0; ipt < nPoints; ipt++){
- sumweights += error[ipt];
- sumx += x[ipt] * error[ipt];
- sumy += y[ipt] * error[ipt];
- sumxy += x[ipt] * y[ipt] * error[ipt];
- sumx2 += x[ipt] * x[ipt] * error[ipt];
- }
- Float_t denominator = sumweights * sumx2 - sumx * sumx;
- fitparams[0] = (sumy * sumx2 - sumx * sumxy) / denominator;
- fitparams[1] = (sumweights * sumxy - sumx * sumy)/ denominator;
-}
-
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
-//
-// Fits a Riemann-circle to the given points without tilting pad correction.
-// The fit is performed using an instance of the class AliRieman (equations
-// and transformations see documentation of this class)
-// Afterwards all the tracklets are Updated
-//
-// Parameters: - Array of tracklets (AliTRDseedV1)
-// - Storage for the chi2 values (beginning with direction z)
-// - Seeding configuration
-// Output: - The curvature
-//
- AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
+ //
+ // Fits a Riemann-circle to the given points without tilting pad correction.
+ // The fit is performed using an instance of the class AliRieman (equations
+ // and transformations see documentation of this class)
+ // Afterwards all the tracklets are Updated
+ //
+ // Parameters: - Array of tracklets (AliTRDseedV1)
+ // - Storage for the chi2 values (beginning with direction z)
+ // - Seeding configuration
+ // Output: - The curvature
+ //
+ AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
fitter->Reset();
- Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
- Int_t *ppl = &allplanes[0];
+ Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
+ Int_t *ppl = &allplanes[0];
Int_t maxLayers = 6;
- if(planes){
- maxLayers = 4;
- ppl = planes;
- }
- for(Int_t il = 0; il < maxLayers; il++){
+ if(planes){
+ maxLayers = 4;
+ ppl = planes;
+ }
+ for(Int_t il = 0; il < maxLayers; il++){
if(!tracklets[ppl[il]].IsOK()) continue;
- fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
- }
- fitter->Update();
- // Set the reference position of the fit and calculate the chi2 values
- memset(chi2, 0, sizeof(Double_t) * 2);
+ fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
+ }
+ fitter->Update();
+ // Set the reference position of the fit and calculate the chi2 values
+ memset(chi2, 0, sizeof(Double_t) * 2);
for(Int_t il = 0; il < maxLayers; il++){
// Reference positions
tracklets[ppl[il]].Init(fitter);
//_________________________________________________________________________
void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
{
-//
-// Performs a Riemann helix fit using the seedclusters as spacepoints
-// Afterwards the chi2 values are calculated and the seeds are updated
-//
-// Parameters: - The four seedclusters
-// - The tracklet array (AliTRDseedV1)
-// - The seeding configuration
-// - Chi2 array
-//
-// debug level 2
-//
+ //
+ // Performs a Riemann helix fit using the seedclusters as spacepoints
+ // Afterwards the chi2 values are calculated and the seeds are updated
+ //
+ // Parameters: - The four seedclusters
+ // - The tracklet array (AliTRDseedV1)
+ // - The seeding configuration
+ // - Chi2 array
+ //
+ // debug level 2
+ //
AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
fitter->Reset();
for(Int_t i = 0; i < 4; i++)
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
{
-//
-// Fits a helix to the clusters. Pad tilting is considered. As constraint it is
-// assumed that the vertex position is set to 0.
-// This method is very usefull for high-pt particles
-// Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
-// x0, y0: Center of the circle
-// Measured y-position: ymeas = y - tan(phiT)(zc - zt)
-// zc: center of the pad row
-// Equation which has to be fitted (after transformation):
-// a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
-// Transformation:
-// t = 1/(x^2 + y^2)
-// u = 2 * x * t
-// v = 2 * x * tan(phiT) * t
-// Parameters in the equation:
-// a = -1/y0, b = x0/y0, e = dz/dx
-//
-// The Curvature is calculated by the following equation:
-// - curv = a/Sqrt(b^2 + 1) = 1/R
-// Parameters: - the 6 tracklets
-// - the Vertex constraint
-// Output: - the Chi2 value of the track
-//
-// debug level 5
-//
+ //
+ // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
+ // assumed that the vertex position is set to 0.
+ // This method is very usefull for high-pt particles
+ // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
+ // x0, y0: Center of the circle
+ // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
+ // zc: center of the pad row
+ // Equation which has to be fitted (after transformation):
+ // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
+ // Transformation:
+ // t = 1/(x^2 + y^2)
+ // u = 2 * x * t
+ // v = 2 * x * tan(phiT) * t
+ // Parameters in the equation:
+ // a = -1/y0, b = x0/y0, e = dz/dx
+ //
+ // The Curvature is calculated by the following equation:
+ // - curv = a/Sqrt(b^2 + 1) = 1/R
+ // Parameters: - the 6 tracklets
+ // - the Vertex constraint
+ // Output: - the Chi2 value of the track
+ //
+ // debug level 5
+ //
TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
fitter->StoreData(kTRUE);
fitter->ClearPoints();
-
+ AliTRDcluster *cl = 0x0;
+
Float_t x, y, z, w, t, error, tilt;
Double_t uvt[2];
Int_t nPoints = 0;
if(!tracklets[ipl].IsOK()) continue;
for(Int_t itb = 0; itb < fgNTimeBins; itb++){
if(!tracklets[ipl].IsUsable(itb)) continue;
- x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0();
- y = tracklets[ipl].GetY(itb);
- z = tracklets[ipl].GetZ(itb);
+ cl = tracklets[ipl].GetClusters(itb);
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
tilt = tracklets[ipl].GetTilt();
// Transformation
- t = 1/(x * x + y * y);
- uvt[0] = 2 * x* t;
- uvt[1] = 2.0 * tilt * x * t;
- w = 2.0 * (y + tilt * (z - zVertex)) * t;
- error = 2 * 0.2 * t;
+ t = 1./(x * x + y * y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = 2. * x * t * tilt ;
+ w = 2. * (y + tilt * (z - zVertex)) * t;
+ error = 2. * 0.2 * t;
fitter->AddPoint(uvt, w, error);
nPoints++;
}
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
TTreeSRedirector &treeStreamer = *fgDebugStreamer;
treeStreamer << "FitTiltedRiemanConstraint"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Curvature=" << curvature
- << "Chi2Track=" << chi2track
- << "Chi2Z=" << chi2Z
- << "zref=" << zref
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Curvature=" << curvature
+ << "Chi2Track=" << chi2track
+ << "Chi2Z=" << chi2Z
+ << "zref=" << zref
+ << "\n";
}
return chi2track;
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
{
-//
-// Performs a Riemann fit taking tilting pad correction into account
-// The equation of a Riemann circle, where the y position is substituted by the
-// measured y-position taking pad tilting into account, has to be transformed
-// into a 4-dimensional hyperplane equation
-// Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
-// Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
-// zc: center of the pad row
-// zt: z-position of the track
-// The z-position of the track is assumed to be linear dependent on the x-position
-// Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
-// Transformation: u = 2 * x * t
-// v = 2 * tan(phiT) * t
-// w = 2 * tan(phiT) * (x - xref) * t
-// t = 1 / (x^2 + ymeas^2)
-// Parameters: a = -1/y0
-// b = x0/y0
-// c = (R^2 -x0^2 - y0^2)/y0
-// d = offset
-// e = dz/dx
-// If the offset respectively the slope in z-position is impossible, the parameters are fixed using
-// results from the simple riemann fit. Afterwards the fit is redone.
-// The curvature is calculated according to the formula:
-// curv = a/(1 + b^2 + c*a) = 1/R
-//
-// Paramters: - Array of tracklets (connected to the track candidate)
-// - Flag selecting the error definition
-// Output: - Chi2 values of the track (in Parameter list)
-//
+ //
+ // Performs a Riemann fit taking tilting pad correction into account
+ // The equation of a Riemann circle, where the y position is substituted by the
+ // measured y-position taking pad tilting into account, has to be transformed
+ // into a 4-dimensional hyperplane equation
+ // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
+ // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
+ // zc: center of the pad row
+ // zt: z-position of the track
+ // The z-position of the track is assumed to be linear dependent on the x-position
+ // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
+ // Transformation: u = 2 * x * t
+ // v = 2 * tan(phiT) * t
+ // w = 2 * tan(phiT) * (x - xref) * t
+ // t = 1 / (x^2 + ymeas^2)
+ // Parameters: a = -1/y0
+ // b = x0/y0
+ // c = (R^2 -x0^2 - y0^2)/y0
+ // d = offset
+ // e = dz/dx
+ // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
+ // results from the simple riemann fit. Afterwards the fit is redone.
+ // The curvature is calculated according to the formula:
+ // curv = a/(1 + b^2 + c*a) = 1/R
+ //
+ // Paramters: - Array of tracklets (connected to the track candidate)
+ // - Flag selecting the error definition
+ // Output: - Chi2 values of the track (in Parameter list)
+ //
TLinearFitter *fitter = GetTiltedRiemanFitter();
fitter->StoreData(kTRUE);
fitter->ClearPoints();
-
+ AliTRDLeastSquare zfitter;
+ AliTRDcluster *cl = 0x0;
+
Double_t xref = CalculateReferenceX(tracklets);
- Double_t x, y, z, t, tilt, xdelta, rhs, error;
+ Double_t x, y, z, t, tilt, dx, w, we;
Double_t uvt[4];
Int_t nPoints = 0;
// Containers for Least-square fitter
- Float_t x0[kNPlanes], zfit[kNPlanes], errors[kNPlanes];
- Int_t nLayers = 0;
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
if(!tracklets[ipl].IsOK()) continue;
- x0[nLayers] = tracklets[ipl].GetX0();
- zfit[nLayers] = tracklets[ipl].GetZfit(0);
- Double_t meanError = 0;
- Int_t ncls = 0;
for(Int_t itb = 0; itb < fgNTimeBins; itb++){
+ if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
if (!tracklets[ipl].IsUsable(itb)) continue;
- x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0();
- y = tracklets[ipl].GetY(itb);
- z = tracklets[ipl].GetZ(itb);
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
tilt = tracklets[ipl].GetTilt();
- xdelta = x - xref;
+ dx = x - xref;
// Transformation
- t = 1/(x*x + y*y);
- uvt[0] = 2.0 * x * t;
+ t = 1./(x*x + y*y);
+ uvt[0] = 2. * x * t;
uvt[1] = t;
- uvt[2] = 2.0 * tilt * t;
- uvt[3] = 2.0 * tilt * xdelta * t;
- rhs = 2.0 * (y + tilt*z) * t;
+ uvt[2] = 2. * tilt * t;
+ uvt[3] = 2. * tilt * dx * t;
+ w = 2. * (y + tilt*z) * t;
// error definition changes for the different calls
- error = 2.0 * t;
- error *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
- fitter->AddPoint(uvt, rhs, error);
+ we = 2. * t;
+ we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
+ fitter->AddPoint(uvt, w, we);
+ zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
nPoints++;
- meanError += tracklets[ipl].GetClusters(itb)->GetSigmaZ2();
- ncls++;
}
- errors[nLayers] = meanError / ncls;
- nLayers++;
}
-
fitter->Eval();
+ zfitter.Eval();
Double_t offset = fitter->GetParameter(3);
Double_t slope = fitter->GetParameter(4);
acceptablez = kFALSE;
}
if (!acceptablez) {
- Float_t fitparams[2];
- FitLeastSquare(nLayers, x0, zfit, errors, fitparams);
- Double_t dzmf = fitparams[1];
- Double_t zmf = fitparams[0] + dzmf * xref;
- //printf("In FitTilted Rieman: zmf = %f, meandz = %f\n", zmf, dzmf);
+ Double_t dzmf = zfitter.GetFunctionParameter(1);
+ Double_t zmf = zfitter.GetFunctionValue(&xref);
fgTiltedRieman->FixParameter(3, zmf);
fgTiltedRieman->FixParameter(4, dzmf);
fitter->Eval();
Double_t x0 = -b / a;
if (-c * a + b * b + 1 > 0) {
if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
- Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
- if (a < 0) yderiv *= -1.0;
- dy = yderiv;
+ Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
+ if (a < 0) yderiv *= -1.0;
+ dy = yderiv;
}
}
z = offset + slope * (x - xref);
tracklets[iLayer].SetZref(1, dz);
tracklets[iLayer].SetC(curvature);
tracklets[iLayer].SetChi2(chi2track);
- }
+ }
if(AliTRDReconstructor::StreamLevel() >=5){
TTreeSRedirector &cstreamer = *fgDebugStreamer;
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
cstreamer << "FitTiltedRieman0"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "xref=" << xref
- << "Chi2Z=" << chi2z
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "xref=" << xref
+ << "Chi2Z=" << chi2z
+ << "\n";
}
return chi2track;
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
{
-//
-// Calculates the chi2-value of the track in z-Direction including tilting pad correction.
-// A linear dependence on the x-value serves as a model.
-// The parameters are related to the tilted Riemann fit.
-// Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
-// - the offset for the reference x
-// - the slope
-// - the reference x position
-// Output: - The Chi2 value of the track in z-Direction
-//
+ //
+ // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
+ // A linear dependence on the x-value serves as a model.
+ // The parameters are related to the tilted Riemann fit.
+ // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
+ // - the offset for the reference x
+ // - the slope
+ // - the reference x position
+ // Output: - The Chi2 value of the track in z-Direction
+ //
Float_t chi2Z = 0, nLayers = 0;
for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) {
if(!tracklets[iLayer].IsOK()) continue;
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
{
- //
- // Starting from current X-position of track <t> this function
- // extrapolates the track up to radial position <xToGo>.
- // Returns 1 if track reaches the plane, and 0 otherwise
- //
+ //
+ // Starting from current X-position of track <t> this function
+ // extrapolates the track up to radial position <xToGo>.
+ // Returns 1 if track reaches the plane, and 0 otherwise
+ //
- const Double_t kEpsilon = 0.00001;
+ const Double_t kEpsilon = 0.00001;
- // Current track X-position
- Double_t xpos = t.GetX();
+ // Current track X-position
+ Double_t xpos = t.GetX();
- // Direction: inward or outward
- Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
+ // Direction: inward or outward
+ Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
- while (((xToGo - xpos) * dir) > kEpsilon) {
+ while (((xToGo - xpos) * dir) > kEpsilon) {
- Double_t xyz0[3];
- Double_t xyz1[3];
- Double_t param[7];
- Double_t x;
- Double_t y;
- Double_t z;
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t param[7];
+ Double_t x;
+ Double_t y;
+ Double_t z;
- // The next step size
- Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
+ // The next step size
+ Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
- // Get the global position of the starting point
- t.GetXYZ(xyz0);
+ // Get the global position of the starting point
+ t.GetXYZ(xyz0);
- // X-position after next step
- x = xpos + step;
+ // X-position after next step
+ x = xpos + step;
- // Get local Y and Z at the X-position of the next step
- if (!t.GetProlongation(x,y,z)) {
- return 0; // No prolongation possible
- }
+ // Get local Y and Z at the X-position of the next step
+ if (!t.GetProlongation(x,y,z)) {
+ return 0; // No prolongation possible
+ }
- // The global position of the end point of this prolongation step
- xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
- xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
- xyz1[2] = z;
+ // The global position of the end point of this prolongation step
+ xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
+ xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
+ xyz1[2] = z;
- // Calculate the mean material budget between start and
- // end point of this prolongation step
- AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
+ // Calculate the mean material budget between start and
+ // end point of this prolongation step
+ AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
- // Propagate the track to the X-position after the next step
- if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
- return 0;
- }
+ // Propagate the track to the X-position after the next step
+ if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
+ return 0;
+ }
- // Rotate the track if necessary
- AdjustSector(&t);
+ // Rotate the track if necessary
+ AdjustSector(&t);
- // New track X-position
- xpos = t.GetX();
+ // New track X-position
+ xpos = t.GetX();
- }
+ }
- return 1;
+ return 1;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
{
- //
- // Reads AliTRDclusters from the file.
- // The names of the cluster tree and branches
- // should match the ones used in AliTRDclusterizer::WriteClusters()
- //
-
- Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
- TObjArray *clusterArray = new TObjArray(nsize+1000);
-
- TBranch *branch = clusterTree->GetBranch("TRDcluster");
- if (!branch) {
- AliError("Can't get the branch !");
- return 1;
- }
- branch->SetAddress(&clusterArray);
-
- if(!fClusters){
- array = new TClonesArray("AliTRDcluster", nsize);
- array->SetOwner(kTRUE);
- }
-
- // Loop through all entries in the tree
- Int_t nEntries = (Int_t) clusterTree->GetEntries();
- Int_t nbytes = 0;
- Int_t ncl = 0;
- AliTRDcluster *c = 0x0;
- for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
- // Import the tree
- nbytes += clusterTree->GetEvent(iEntry);
-
- // Get the number of points in the detector
- Int_t nCluster = clusterArray->GetEntriesFast();
- for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
- if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
+ //
+ // Reads AliTRDclusters from the file.
+ // The names of the cluster tree and branches
+ // should match the ones used in AliTRDclusterizer::WriteClusters()
+ //
+
+ Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
+ TObjArray *clusterArray = new TObjArray(nsize+1000);
+
+ TBranch *branch = clusterTree->GetBranch("TRDcluster");
+ if (!branch) {
+ AliError("Can't get the branch !");
+ return 1;
+ }
+ branch->SetAddress(&clusterArray);
+
+ if(!fClusters){
+ array = new TClonesArray("AliTRDcluster", nsize);
+ array->SetOwner(kTRUE);
+ }
+
+ // Loop through all entries in the tree
+ Int_t nEntries = (Int_t) clusterTree->GetEntries();
+ Int_t nbytes = 0;
+ Int_t ncl = 0;
+ AliTRDcluster *c = 0x0;
+ for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
+ // Import the tree
+ nbytes += clusterTree->GetEvent(iEntry);
+
+ // Get the number of points in the detector
+ Int_t nCluster = clusterArray->GetEntriesFast();
+ for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
+ if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
c->SetInChamber();
- new((*fClusters)[ncl++]) AliTRDcluster(*c);
- clusterArray->RemoveAt(iCluster);
- }
+ new((*fClusters)[ncl++]) AliTRDcluster(*c);
+ delete (clusterArray->RemoveAt(iCluster));
+ }
- }
- delete clusterArray;
+ }
+ delete clusterArray;
- return 0;
+ return 0;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
{
- //
- // Fills clusters into TRD tracking_sectors
- // Note that the numbering scheme for the TRD tracking_sectors
- // differs from that of TRD sectors
- //
-
-
- if (ReadClusters(fClusters, cTree)) {
- AliError("Problem with reading the clusters !");
- return 1;
- }
- Int_t ncl = fClusters->GetEntriesFast(), nin = 0;
+ //
+ // Fills clusters into TRD tracking_sectors
+ // Note that the numbering scheme for the TRD tracking_sectors
+ // differs from that of TRD sectors
+ //
+
+
+ if (ReadClusters(fClusters, cTree)) {
+ AliError("Problem with reading the clusters !");
+ return 1;
+ }
+ Int_t ncl = fClusters->GetEntriesFast(), nin = 0;
if(!ncl){
- AliInfo("Clusters 0");
+ AliInfo("Clusters 0");
return 1;
}
- Int_t icl = ncl;
- while (icl--) {
- AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
+ Int_t icl = ncl;
+ while (icl--) {
+ AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
if(c->IsInChamber()) nin++;
- Int_t detector = c->GetDetector();
- Int_t sector = fGeom->GetSector(detector);
- Int_t stack = fGeom->GetChamber(detector);
- Int_t plane = fGeom->GetPlane(detector);
+ Int_t detector = c->GetDetector();
+ Int_t sector = fGeom->GetSector(detector);
+ Int_t stack = fGeom->GetChamber(detector);
+ Int_t plane = fGeom->GetPlane(detector);
fTrSec[sector].GetChamber(stack, plane, kTRUE)->InsertCluster(c, icl);
- }
- AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl));
+ }
+ AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl));
for(int isector =0; isector<AliTRDgeometry::kNsect; isector++){
if(!fTrSec[isector].GetNChambers()) continue;
fTrSec[isector].Init();
- }
-
- return 0;
+ }
+
+ return 0;
}
//____________________________________________________________________
void AliTRDtrackerV1::UnloadClusters()
{
- //
- // Clears the arrays of clusters and tracks. Resets sectors and timebins
- //
+ //
+ // Clears the arrays of clusters and tracks. Resets sectors and timebins
+ //
if(fTracks) fTracks->Delete();
- if(fTracklets) fTracklets->Delete();
- if(fClusters) fClusters->Delete();
+ if(fTracklets) fTracklets->Delete();
+ if(fClusters) fClusters->Delete();
- for (int i = 0; i < AliTRDgeometry::kNsect; i++) fTrSec[i].Clear();
+ for (int i = 0; i < AliTRDgeometry::kNsect; i++) fTrSec[i].Clear();
// Increment the Event Number
AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
//_____________________________________________________________________________
Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
{
- //
- // Rotates the track when necessary
- //
-
- Double_t alpha = AliTRDgeometry::GetAlpha();
- Double_t y = track->GetY();
- Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
-
- if (y > ymax) {
- if (!track->Rotate( alpha)) {
- return kFALSE;
- }
- }
- else if (y < -ymax) {
- if (!track->Rotate(-alpha)) {
- return kFALSE;
- }
- }
-
- return kTRUE;
+ //
+ // Rotates the track when necessary
+ //
+
+ Double_t alpha = AliTRDgeometry::GetAlpha();
+ Double_t y = track->GetY();
+ Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
+
+ if (y > ymax) {
+ if (!track->Rotate( alpha)) {
+ return kFALSE;
+ }
+ }
+ else if (y < -ymax) {
+ if (!track->Rotate(-alpha)) {
+ return kFALSE;
+ }
+ }
+
+ return kTRUE;
}
//____________________________________________________________________
AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
{
-// Find tracklet for TRD track <track>
-// Parameters
-// - track
-// - sector
-// - plane
-// - index
-// Output
-// tracklet
-// index
-// Detailed description
-//
+ // Find tracklet for TRD track <track>
+ // Parameters
+ // - track
+ // - sector
+ // - plane
+ // - index
+ // Output
+ // tracklet
+ // index
+ // Detailed description
+ //
idx = track->GetTrackletIndex(p);
AliTRDseedV1 *tracklet = idx<0 ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
//____________________________________________________________________
Int_t AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
{
-// Add this tracklet to the list of tracklets stored in the tracker
-//
-// Parameters
-// - tracklet : pointer to the tracklet to be added to the list
-//
-// Output
-// - the index of the new tracklet in the tracker tracklets list
-//
-// Detailed description
-// Build the tracklets list if it is not yet created (late initialization)
-// and adds the new tracklet to the list.
-//
+ // Add this tracklet to the list of tracklets stored in the tracker
+ //
+ // Parameters
+ // - tracklet : pointer to the tracklet to be added to the list
+ //
+ // Output
+ // - the index of the new tracklet in the tracker tracklets list
+ //
+ // Detailed description
+ // Build the tracklets list if it is not yet created (late initialization)
+ // and adds the new tracklet to the list.
+ //
if(!fTracklets){
fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsect()*kMaxTracksStack);
fTracklets->SetOwner(kTRUE);
return nentries;
}
+//____________________________________________________________________
+Bool_t AliTRDtrackerV1::UpdateTracklet(AliTRDseedV1 *tracklet, Int_t index){
+ //
+ // Update Tracklet in the tracklet container
+ //
+ // Parameters:
+ // - the tracklet information
+ // - the index of the tracklet which has to be updated
+ //
+ // Output:
+ // - True if successfull
+ // - false if the container doesn't exist or the index is out of range
+ //
+ if(!fTracklets || index >= fTracklets->GetEntriesFast()) return kFALSE;
+
+ new((*fTracklets)[index]) AliTRDseedV1(*tracklet);
+ return kTRUE;
+}
+
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
{
- //
- // Steer tracking for one SM.
- //
- // Parameters :
- // sector : Array of (SM) propagation layers containing clusters
- // esd : The current ESD event. On output it contains the also
- // the ESD (TRD) tracks found in this SM.
- //
- // Output :
- // Number of tracks found in this TRD supermodule.
- //
- // Detailed description
- //
- // 1. Unpack AliTRDpropagationLayers objects for each stack.
- // 2. Launch stack tracking.
- // See AliTRDtrackerV1::Clusters2TracksStack() for details.
- // 3. Pack results in the ESD event.
- //
+ //
+ // Steer tracking for one SM.
+ //
+ // Parameters :
+ // sector : Array of (SM) propagation layers containing clusters
+ // esd : The current ESD event. On output it contains the also
+ // the ESD (TRD) tracks found in this SM.
+ //
+ // Output :
+ // Number of tracks found in this TRD supermodule.
+ //
+ // Detailed description
+ //
+ // 1. Unpack AliTRDpropagationLayers objects for each stack.
+ // 2. Launch stack tracking.
+ // See AliTRDtrackerV1::Clusters2TracksStack() for details.
+ // 3. Pack results in the ESD event.
+ //
// allocate space for esd tracks in this SM
TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
}
//AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
- for(int itrack=0; itrack<nTracks; itrack++)
- esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
+ for(int itrack=0; itrack<nTracks; itrack++)
+ esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
// Reset Track and Candidate Number
AliTRDtrackerDebug::SetCandidateNumber(0);
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
{
- //
- // Make tracks in one TRD stack.
- //
- // Parameters :
- // layer : Array of stack propagation layers containing clusters
- // esdTrackList : Array of ESD tracks found by the stand alone tracker.
- // On exit the tracks found in this stack are appended.
- //
- // Output :
- // Number of tracks found in this stack.
- //
- // Detailed description
- //
- // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
- // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
- // See AliTRDtrackerV1::MakeSeeds() for more details.
- // 3. Arrange track candidates in decreasing order of their quality
- // 4. Classify tracks in 5 categories according to:
- // a) number of layers crossed
- // b) track quality
- // 5. Sign clusters by tracks in decreasing order of track quality
- // 6. Build AliTRDtrack out of seeding tracklets
- // 7. Cook MC label
- // 8. Build ESD track and register it to the output list
- //
+ //
+ // Make tracks in one TRD stack.
+ //
+ // Parameters :
+ // layer : Array of stack propagation layers containing clusters
+ // esdTrackList : Array of ESD tracks found by the stand alone tracker.
+ // On exit the tracks found in this stack are appended.
+ //
+ // Output :
+ // Number of tracks found in this stack.
+ //
+ // Detailed description
+ //
+ // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
+ // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
+ // See AliTRDtrackerV1::MakeSeeds() for more details.
+ // 3. Arrange track candidates in decreasing order of their quality
+ // 4. Classify tracks in 5 categories according to:
+ // a) number of layers crossed
+ // b) track quality
+ // 5. Sign clusters by tracks in decreasing order of track quality
+ // 6. Build AliTRDtrack out of seeding tracklets
+ // 7. Cook MC label
+ // 8. Build ESD track and register it to the output list
+ //
AliTRDtrackingChamber *chamber = 0x0;
AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
// Build initial seeding configurations
Double_t quality = BuildSeedingConfigs(stack, configs);
if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Plane config %d %d %d Quality %f"
- , configs[0], configs[1], configs[2], quality));
+ AliInfo(Form("Plane config %d %d %d Quality %f"
+ , configs[0], configs[1], configs[2], quality));
}
// Initialize contors
Int_t ntracks, // number of TRD track candidates
- ntracks1, // number of registered TRD tracks/iter
- ntracks2 = 0; // number of all registered TRD tracks in stack
+ ntracks1, // number of registered TRD tracks/iter
+ ntracks2 = 0; // number of all registered TRD tracks in stack
fSieveSeeding = 0;
do{
// Loop over seeding configurations
// Sieve clusters in decreasing order of track quality
Double_t trackParams[7];
-// AliTRDseedV1 *lseed = 0x0;
+ // AliTRDseedV1 *lseed = 0x0;
Int_t jSieve = 0, candidates;
do{
//AliInfo(Form("\t\tITER = %i ", jSieve));
// Check track candidates
candidates = 0;
for (Int_t itrack = 0; itrack < ntracks; itrack++) {
- Int_t trackIndex = sort[itrack];
- if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
+ Int_t trackIndex = sort[itrack];
+ if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
- // Calculate track parameters from tracklets seeds
- Int_t labelsall[1000];
- Int_t nlabelsall = 0;
- Int_t naccepted = 0;
- Int_t ncl = 0;
- Int_t nused = 0;
- Int_t nlayers = 0;
- Int_t findable = 0;
- for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
- Int_t jseed = kNPlanes*trackIndex+jLayer;
- if(!sseed[jseed].IsOK()) continue;
- if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
-
- sseed[jseed].UpdateUsed();
- ncl += sseed[jseed].GetN2();
- nused += sseed[jseed].GetNUsed();
- nlayers++;
-
- // Cooking label
- for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
- if(!sseed[jseed].IsUsable(itime)) continue;
- naccepted++;
- Int_t tindex = 0, ilab = 0;
- while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
- labelsall[nlabelsall++] = tindex;
- ilab++;
- }
- }
- }
- // Filter duplicated tracks
- if (nused > 30){
- //printf("Skip %d nused %d\n", trackIndex, nused);
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
- if (Float_t(nused)/ncl >= .25){
- //printf("Skip %d nused/ncl >= .25\n", trackIndex);
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
+ // Calculate track parameters from tracklets seeds
+ Int_t labelsall[1000];
+ Int_t nlabelsall = 0;
+ Int_t naccepted = 0;
+ Int_t ncl = 0;
+ Int_t nused = 0;
+ Int_t nlayers = 0;
+ Int_t findable = 0;
+ for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
+ Int_t jseed = kNPlanes*trackIndex+jLayer;
+ if(!sseed[jseed].IsOK()) continue;
+ if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
+
+ sseed[jseed].UpdateUsed();
+ ncl += sseed[jseed].GetN2();
+ nused += sseed[jseed].GetNUsed();
+ nlayers++;
+
+ // Cooking label
+ for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
+ if(!sseed[jseed].IsUsable(itime)) continue;
+ naccepted++;
+ Int_t tindex = 0, ilab = 0;
+ while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
+ labelsall[nlabelsall++] = tindex;
+ ilab++;
+ }
+ }
+ }
+ // Filter duplicated tracks
+ if (nused > 30){
+ //printf("Skip %d nused %d\n", trackIndex, nused);
+ fakeTrack[trackIndex] = kTRUE;
+ continue;
+ }
+ if (Float_t(nused)/ncl >= .25){
+ //printf("Skip %d nused/ncl >= .25\n", trackIndex);
+ fakeTrack[trackIndex] = kTRUE;
+ continue;
+ }
- // Classify tracks
- Bool_t skip = kFALSE;
- switch(jSieve){
- case 0:
- if(nlayers < 6) {skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 1:
- if(nlayers < findable){skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
- break;
-
- case 2:
- if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
- break;
-
- case 3:
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 4:
- if (nlayers == 3){skip = kTRUE; break;}
- //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
- break;
- }
- if(skip){
- candidates++;
- //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
- continue;
- }
- signedTrack[trackIndex] = kTRUE;
+ // Classify tracks
+ Bool_t skip = kFALSE;
+ switch(jSieve){
+ case 0:
+ if(nlayers < 6) {skip = kTRUE; break;}
+ if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
+ break;
+
+ case 1:
+ if(nlayers < findable){skip = kTRUE; break;}
+ if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
+ break;
+
+ case 2:
+ if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
+ if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
+ break;
+
+ case 3:
+ if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
+ break;
+
+ case 4:
+ if (nlayers == 3){skip = kTRUE; break;}
+ //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
+ break;
+ }
+ if(skip){
+ candidates++;
+ //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
+ continue;
+ }
+ signedTrack[trackIndex] = kTRUE;
- // Build track label - what happens if measured data ???
- Int_t labels[1000];
- Int_t outlab[1000];
- Int_t nlab = 0;
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- Int_t jseed = kNPlanes*trackIndex+iLayer;
- if(!sseed[jseed].IsOK()) continue;
- for(int ilab=0; ilab<2; ilab++){
- if(sseed[jseed].GetLabels(ilab) < 0) continue;
- labels[nlab] = sseed[jseed].GetLabels(ilab);
- nlab++;
- }
- }
- Freq(nlab,labels,outlab,kFALSE);
- Int_t label = outlab[0];
- Int_t frequency = outlab[1];
- Freq(nlabelsall,labelsall,outlab,kFALSE);
- Int_t label1 = outlab[0];
- Int_t label2 = outlab[2];
- Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
+ // Build track label - what happens if measured data ???
+ Int_t labels[1000];
+ Int_t outlab[1000];
+ Int_t nlab = 0;
+ for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
+ Int_t jseed = kNPlanes*trackIndex+iLayer;
+ if(!sseed[jseed].IsOK()) continue;
+ for(int ilab=0; ilab<2; ilab++){
+ if(sseed[jseed].GetLabels(ilab) < 0) continue;
+ labels[nlab] = sseed[jseed].GetLabels(ilab);
+ nlab++;
+ }
+ }
+ Freq(nlab,labels,outlab,kFALSE);
+ Int_t label = outlab[0];
+ Int_t frequency = outlab[1];
+ Freq(nlabelsall,labelsall,outlab,kFALSE);
+ Int_t label1 = outlab[0];
+ Int_t label2 = outlab[2];
+ Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
- // Sign clusters
- AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
- Int_t jseed = kNPlanes*trackIndex+jLayer;
- if(!sseed[jseed].IsOK()) continue;
- if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
- sseed[jseed].UseClusters();
- if(!cl){
- Int_t ic = 0;
- while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
- clusterIndex = sseed[jseed].GetIndexes(ic);
- }
- }
- if(!cl) continue;
+ // Sign clusters
+ AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
+ for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
+ Int_t jseed = kNPlanes*trackIndex+jLayer;
+ if(!sseed[jseed].IsOK()) continue;
+ if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
+ sseed[jseed].UseClusters();
+ if(!cl){
+ Int_t ic = 0;
+ while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
+ clusterIndex = sseed[jseed].GetIndexes(ic);
+ }
+ }
+ if(!cl) continue;
- // Build track parameters
- AliTRDseedV1 *lseed =&sseed[trackIndex*6];
- Int_t idx = 0;
- while(idx<3 && !lseed->IsOK()) {
- idx++;
- lseed++;
- }
- Double_t cR = lseed->GetC();
- trackParams[1] = lseed->GetYref(0);
- trackParams[2] = lseed->GetZref(0);
- trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1)));
- trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
- trackParams[5] = cR;
- trackParams[0] = lseed->GetX0();
- Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
- trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
+ // Build track parameters
+ AliTRDseedV1 *lseed =&sseed[trackIndex*6];
+ Int_t idx = 0;
+ while(idx<3 && !lseed->IsOK()) {
+ idx++;
+ lseed++;
+ }
+ Double_t cR = lseed->GetC();
+ trackParams[1] = lseed->GetYref(0);
+ trackParams[2] = lseed->GetZref(0);
+ trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1)));
+ trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
+ trackParams[5] = cR;
+ trackParams[0] = lseed->GetX0();
+ Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
+ trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
+
+ if(AliTRDReconstructor::StreamLevel() > 1){
+ AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
- Int_t nclusters = 0;
- AliTRDseedV1 *dseed[6];
- for(int is=0; is<6; is++){
- dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]);
- dseed[is]->SetOwner();
- nclusters += sseed[is].GetN2();
- }
- //Int_t eventNrInFile = esd->GetEventNumberInFile();
- //AliInfo(Form("Number of clusters %d.", nclusters));
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "Clusters2TracksStack"
- << "EventNumber=" << eventNumber
- << "TrackNumber=" << trackNumber
- << "CandidateNumber=" << candidateNumber
- << "Iter=" << fSieveSeeding
- << "Like=" << fTrackQuality[trackIndex]
- << "S0.=" << dseed[0]
- << "S1.=" << dseed[1]
- << "S2.=" << dseed[2]
- << "S3.=" << dseed[3]
- << "S4.=" << dseed[4]
- << "S5.=" << dseed[5]
- << "p0=" << trackParams[0]
- << "p1=" << trackParams[1]
- << "p2=" << trackParams[2]
- << "p3=" << trackParams[3]
- << "p4=" << trackParams[4]
- << "p5=" << trackParams[5]
- << "p6=" << trackParams[6]
- << "Label=" << label
- << "Label1=" << label1
- << "Label2=" << label2
- << "FakeRatio=" << fakeratio
- << "Freq=" << frequency
- << "Ncl=" << ncl
- << "NLayers=" << nlayers
- << "Findable=" << findable
- << "NUsed=" << nused
- << "\n";
- }
+ Int_t nclusters = 0;
+ AliTRDseedV1 *dseed[6];
+ for(int is=0; is<6; is++){
+ dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]);
+ dseed[is]->SetOwner();
+ nclusters += sseed[is].GetN2();
+ }
+ //Int_t eventNrInFile = esd->GetEventNumberInFile();
+ //AliInfo(Form("Number of clusters %d.", nclusters));
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TTreeSRedirector &cstreamer = *fgDebugStreamer;
+ cstreamer << "Clusters2TracksStack"
+ << "EventNumber=" << eventNumber
+ << "TrackNumber=" << trackNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Iter=" << fSieveSeeding
+ << "Like=" << fTrackQuality[trackIndex]
+ << "S0.=" << dseed[0]
+ << "S1.=" << dseed[1]
+ << "S2.=" << dseed[2]
+ << "S3.=" << dseed[3]
+ << "S4.=" << dseed[4]
+ << "S5.=" << dseed[5]
+ << "p0=" << trackParams[0]
+ << "p1=" << trackParams[1]
+ << "p2=" << trackParams[2]
+ << "p3=" << trackParams[3]
+ << "p4=" << trackParams[4]
+ << "p5=" << trackParams[5]
+ << "p6=" << trackParams[6]
+ << "Label=" << label
+ << "Label1=" << label1
+ << "Label2=" << label2
+ << "FakeRatio=" << fakeratio
+ << "Freq=" << frequency
+ << "Ncl=" << ncl
+ << "NLayers=" << nlayers
+ << "Findable=" << findable
+
+ << "NUsed=" << nused
+ << "\n";
+ }
- AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
- if(!track){
- //AliWarning("Fail to build a TRD Track.");
- continue;
- }
- //AliInfo("End of MakeTrack()");
- AliESDtrack esdTrack;
- esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout);
- esdTrack.SetLabel(track->GetLabel());
- new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack);
- ntracks1++;
- AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
+ AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
+ if(!track){
+ //AliWarning("Fail to build a TRD Track.");
+ continue;
+ }
+ //AliInfo("End of MakeTrack()");
+ AliESDtrack esdTrack;
+ esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout);
+ esdTrack.SetLabel(track->GetLabel());
+ track->UpdateESDtrack(&esdTrack);
+ // write ESD-friends if neccessary
+ if (AliTRDReconstructor::StreamLevel() > 0){
+ //printf("Creating Calibrations Object\n");
+ AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
+ calibTrack->SetOwner();
+ esdTrack.AddCalibObject(calibTrack);
+ }
+ new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack);
+ ntracks1++;
+ AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
}
jSieve++;
//___________________________________________________________________
Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
{
- //
- // Assign probabilities to chambers according to their
- // capability of producing seeds.
- //
- // Parameters :
- //
- // layers : Array of stack propagation layers for all 6 chambers in one stack
- // configs : On exit array of configuration indexes (see GetSeedingConfig()
- // for details) in the decreasing order of their seeding probabilities.
- //
- // Output :
- //
- // Return top configuration quality
- //
- // Detailed description:
- //
- // To each chamber seeding configuration (see GetSeedingConfig() for
- // the list of all configurations) one defines 2 quality factors:
- // - an apriori topological quality (see GetSeedingConfig() for details) and
- // - a data quality based on the uniformity of the distribution of
- // clusters over the x range (time bins population). See CookChamberQA() for details.
- // The overall chamber quality is given by the product of this 2 contributions.
- //
+ //
+ // Assign probabilities to chambers according to their
+ // capability of producing seeds.
+ //
+ // Parameters :
+ //
+ // layers : Array of stack propagation layers for all 6 chambers in one stack
+ // configs : On exit array of configuration indexes (see GetSeedingConfig()
+ // for details) in the decreasing order of their seeding probabilities.
+ //
+ // Output :
+ //
+ // Return top configuration quality
+ //
+ // Detailed description:
+ //
+ // To each chamber seeding configuration (see GetSeedingConfig() for
+ // the list of all configurations) one defines 2 quality factors:
+ // - an apriori topological quality (see GetSeedingConfig() for details) and
+ // - a data quality based on the uniformity of the distribution of
+ // clusters over the x range (time bins population). See CookChamberQA() for details.
+ // The overall chamber quality is given by the product of this 2 contributions.
+ //
Double_t chamberQ[kNPlanes];
AliTRDtrackingChamber *chamber = 0x0;
for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
}
- TMath::Sort(kNConfigs, tconfig, configs, kTRUE);
-// AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
-// AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
-// AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
+ TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
+ // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
+ // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
+ // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
return tconfig[configs[0]];
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
{
- //
- // Make tracklet seeds in the TRD stack.
- //
- // Parameters :
- // layers : Array of stack propagation layers containing clusters
- // sseed : Array of empty tracklet seeds. On exit they are filled.
- // ipar : Control parameters:
- // ipar[0] -> seeding chambers configuration
- // ipar[1] -> stack index
- // ipar[2] -> number of track candidates found so far
- //
- // Output :
- // Number of tracks candidates found.
- //
- // Detailed description
- //
- // The following steps are performed:
- // 1. Select seeding layers from seeding chambers
- // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
- // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
- // this order. The parameters controling the range of accepted clusters in
- // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
- // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
- // 4. Initialize seeding tracklets in the seeding chambers.
- // 5. Filter 0.
- // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
- // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
- // 6. Attach clusters to seeding tracklets and find linear approximation of
- // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
- // clusters used by current seeds should not exceed ... (25).
- // 7. Filter 1.
- // All 4 seeding tracklets should be correctly constructed (see
- // AliTRDseedV1::AttachClustersIter())
- // 8. Helix fit of the seeding tracklets
- // 9. Filter 2.
- // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
- // 10. Extrapolation of the helix fit to the other 2 chambers:
- // a) Initialization of extrapolation tracklet with fit parameters
- // b) Helix fit of tracklets
- // c) Attach clusters and linear interpolation to extrapolated tracklets
- // d) Helix fit of tracklets
- // 11. Improve seeding tracklets quality by reassigning clusters.
- // See AliTRDtrackerV1::ImproveSeedQuality() for details.
- // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
- // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
- // 14. Cooking labels for tracklets. Should be done only for MC
- // 15. Register seeds.
- //
+ //
+ // Make tracklet seeds in the TRD stack.
+ //
+ // Parameters :
+ // layers : Array of stack propagation layers containing clusters
+ // sseed : Array of empty tracklet seeds. On exit they are filled.
+ // ipar : Control parameters:
+ // ipar[0] -> seeding chambers configuration
+ // ipar[1] -> stack index
+ // ipar[2] -> number of track candidates found so far
+ //
+ // Output :
+ // Number of tracks candidates found.
+ //
+ // Detailed description
+ //
+ // The following steps are performed:
+ // 1. Select seeding layers from seeding chambers
+ // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
+ // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
+ // this order. The parameters controling the range of accepted clusters in
+ // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
+ // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
+ // 4. Initialize seeding tracklets in the seeding chambers.
+ // 5. Filter 0.
+ // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
+ // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
+ // 6. Attach clusters to seeding tracklets and find linear approximation of
+ // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
+ // clusters used by current seeds should not exceed ... (25).
+ // 7. Filter 1.
+ // All 4 seeding tracklets should be correctly constructed (see
+ // AliTRDseedV1::AttachClustersIter())
+ // 8. Helix fit of the seeding tracklets
+ // 9. Filter 2.
+ // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
+ // 10. Extrapolation of the helix fit to the other 2 chambers:
+ // a) Initialization of extrapolation tracklet with fit parameters
+ // b) Helix fit of tracklets
+ // c) Attach clusters and linear interpolation to extrapolated tracklets
+ // d) Helix fit of tracklets
+ // 11. Improve seeding tracklets quality by reassigning clusters.
+ // See AliTRDtrackerV1::ImproveSeedQuality() for details.
+ // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
+ // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
+ // 14. Cooking labels for tracklets. Should be done only for MC
+ // 15. Register seeds.
+ //
AliTRDtrackingChamber *chamber = 0x0;
AliTRDcluster *c[4] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
Int_t kcl = 0;
while(kcl<mcl) {
- c[1] = (*layer[1])[jndex[kcl++]];
- if(!c[1]) continue;
- layer[2]->BuildCond(c[1], cond2, 2, theta, phi);
- c[2] = layer[2]->GetNearestCluster(cond2);
- //printf("Found c[1] candidate 2 %p\n", c[2]);
- if(!c[2]) continue;
+ c[1] = (*layer[1])[jndex[kcl++]];
+ if(!c[1]) continue;
+ layer[2]->BuildCond(c[1], cond2, 2, theta, phi);
+ c[2] = layer[2]->GetNearestCluster(cond2);
+ //printf("Found c[1] candidate 2 %p\n", c[2]);
+ if(!c[2]) continue;
-// AliInfo("Seeding clusters found. Building seeds ...");
-// 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());
+ // AliInfo("Seeding clusters found. Building seeds ...");
+ // 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());
- for (Int_t il = 0; il < 6; il++) cseed[il].Reset();
-
- FitRieman(c, chi2);
-
- AliTRDseedV1 *tseed = 0x0;
- for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
- Int_t jLayer = planes[iLayer];
- tseed = &cseed[jLayer];
- tseed->SetPlane(jLayer);
- tseed->SetTilt(hL[jLayer]);
- tseed->SetPadLength(padlength[jLayer]);
- tseed->SetX0(stack[jLayer]->GetX());
- tseed->Init(GetRiemanFitter());
- }
+ for (Int_t il = 0; il < 6; il++) cseed[il].Reset();
+
+ FitRieman(c, chi2);
+
+ AliTRDseedV1 *tseed = 0x0;
+ for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
+ Int_t jLayer = planes[iLayer];
+ tseed = &cseed[jLayer];
+ tseed->SetPlane(jLayer);
+ tseed->SetTilt(hL[jLayer]);
+ tseed->SetPadLength(padlength[jLayer]);
+ tseed->SetX0(stack[jLayer]->GetX());
+ tseed->Init(GetRiemanFitter());
+ }
- Bool_t isFake = kFALSE;
- if(AliTRDReconstructor::StreamLevel() >= 2){
- if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
- if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
- if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
-
- Double_t xpos[4];
- for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = layer[l]->GetX();
- Float_t yref[4];
- for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
- Int_t ll = c[3]->GetLabel(0);
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- AliRieman *rim = GetRiemanFitter();
- TTreeSRedirector &cs0 = *fgDebugStreamer;
- cs0 << "MakeSeeds0"
- <<"EventNumber=" << eventNumber
- <<"CandidateNumber=" << candidateNumber
- <<"isFake=" << isFake
- <<"config=" << config
- <<"label=" << ll
- <<"chi2z=" << chi2[0]
- <<"chi2y=" << chi2[1]
- <<"Y2exp=" << cond2[0]
- <<"Z2exp=" << cond2[1]
- <<"X0=" << xpos[0] //layer[sLayer]->GetX()
- <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
- <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
- <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
- <<"yref0=" << yref[0]
- <<"yref1=" << yref[1]
- <<"yref2=" << yref[2]
- <<"yref3=" << yref[3]
- <<"c0.=" << c[0]
- <<"c1.=" << c[1]
- <<"c2.=" << c[2]
- <<"c3.=" << c[3]
- <<"Seed0.=" << &cseed[planes[0]]
- <<"Seed1.=" << &cseed[planes[1]]
- <<"Seed2.=" << &cseed[planes[2]]
- <<"Seed3.=" << &cseed[planes[3]]
- <<"RiemanFitter.=" << rim
- <<"\n";
- }
+ Bool_t isFake = kFALSE;
+ if(AliTRDReconstructor::StreamLevel() >= 2){
+ if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+ if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+ if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+
+ Double_t xpos[4];
+ for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = layer[l]->GetX();
+ Float_t yref[4];
+ for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
+ Int_t ll = c[3]->GetLabel(0);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ AliRieman *rim = GetRiemanFitter();
+ TTreeSRedirector &cs0 = *fgDebugStreamer;
+ cs0 << "MakeSeeds0"
+ <<"EventNumber=" << eventNumber
+ <<"CandidateNumber=" << candidateNumber
+ <<"isFake=" << isFake
+ <<"config=" << config
+ <<"label=" << ll
+ <<"chi2z=" << chi2[0]
+ <<"chi2y=" << chi2[1]
+ <<"Y2exp=" << cond2[0]
+ <<"Z2exp=" << cond2[1]
+ <<"X0=" << xpos[0] //layer[sLayer]->GetX()
+ <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
+ <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
+ <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
+ <<"yref0=" << yref[0]
+ <<"yref1=" << yref[1]
+ <<"yref2=" << yref[2]
+ <<"yref3=" << yref[3]
+ <<"c0.=" << c[0]
+ <<"c1.=" << c[1]
+ <<"c2.=" << c[2]
+ <<"c3.=" << c[3]
+ <<"Seed0.=" << &cseed[planes[0]]
+ <<"Seed1.=" << &cseed[planes[1]]
+ <<"Seed2.=" << &cseed[planes[2]]
+ <<"Seed3.=" << &cseed[planes[3]]
+ <<"RiemanFitter.=" << rim
+ <<"\n";
+ }
- if(chi2[0] > AliTRDReconstructor::RecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
- //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- if(chi2[1] > AliTRDReconstructor::RecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
- //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo("Passed chi2 filter.");
-
- // try attaching clusters to tracklets
- Int_t nUsedCl = 0;
- Int_t nlayers = 0;
- for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
- Int_t jLayer = planes[iLayer];
- if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
- nUsedCl += cseed[jLayer].GetNUsed();
- if(nUsedCl > 25) break;
- nlayers++;
- }
- if(nlayers < kNSeedPlanes){
- //AliInfo(Form("Failed updating all seeds %d [%d].", nlayers, kNSeedPlanes));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- // fit tracklets and cook likelihood
- FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
- chi2[0] = GetChi2Y(&cseed[0]);
- chi2[1] = GetChi2Z(&cseed[0]);
- //Chi2 definitions in testing stage
- //chi2[0] = GetChi2YTest(&cseed[0]);
- //chi2[1] = GetChi2ZTest(&cseed[0]);
- Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked
-
- if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::RecoParam()->GetTrackLikelihood()){
- //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
-
- // book preliminary results
- seedQuality[ntracks] = like;
- fSeedLayer[ntracks] = config;/*sLayer;*/
-
- // attach clusters to the extrapolation seeds
- Int_t lextrap[2];
- GetExtrapolationConfig(config, lextrap);
- Int_t nusedf = 0; // debug value
- for(int iLayer=0; iLayer<2; iLayer++){
- Int_t jLayer = lextrap[iLayer];
- if(!(chamber = stack[jLayer])) continue;
+ if(chi2[0] > AliTRDReconstructor::RecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
+ //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ if(chi2[1] > AliTRDReconstructor::RecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
+ //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo("Passed chi2 filter.");
+
+ // try attaching clusters to tracklets
+ Int_t nUsedCl = 0;
+ Int_t nlayers = 0;
+ for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
+ Int_t jLayer = planes[iLayer];
+ if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
+ nUsedCl += cseed[jLayer].GetNUsed();
+ if(nUsedCl > 25) break;
+ nlayers++;
+ }
+ if(nlayers < kNSeedPlanes){
+ //AliInfo(Form("Failed updating all seeds %d [%d].", nlayers, kNSeedPlanes));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ // fit tracklets and cook likelihood
+ FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
+ chi2[0] = GetChi2Y(&cseed[0]);
+ chi2[1] = GetChi2Z(&cseed[0]);
+ //Chi2 definitions in testing stage
+ //chi2[0] = GetChi2YTest(&cseed[0]);
+ //chi2[1] = GetChi2ZTest(&cseed[0]);
+ Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked
+
+ if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::RecoParam()->GetTrackLikelihood()){
+ //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
+
+ // book preliminary results
+ seedQuality[ntracks] = like;
+ fSeedLayer[ntracks] = config;/*sLayer;*/
+
+ // attach clusters to the extrapolation seeds
+ Int_t lextrap[2];
+ GetExtrapolationConfig(config, lextrap);
+ Int_t nusedf = 0; // debug value
+ for(int iLayer=0; iLayer<2; iLayer++){
+ Int_t jLayer = lextrap[iLayer];
+ if(!(chamber = stack[jLayer])) continue;
- // prepare extrapolated seed
- cseed[jLayer].Reset();
- cseed[jLayer].SetPlane(jLayer);
- cseed[jLayer].SetTilt(hL[jLayer]);
- cseed[jLayer].SetX0(chamber->GetX());
- cseed[jLayer].SetPadLength(padlength[jLayer]);
-
- // fit extrapolated seed
- if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
- if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
- AliTRDseedV1 tseed = cseed[jLayer];
- if(!tseed.AttachClustersIter(chamber, 1000.)) continue;
- cseed[jLayer] = tseed;
- nusedf += cseed[jLayer].GetNUsed(); // debug value
- FitTiltedRieman(cseed, kTRUE);
- }
+ // prepare extrapolated seed
+ cseed[jLayer].Reset();
+ cseed[jLayer].SetPlane(jLayer);
+ cseed[jLayer].SetTilt(hL[jLayer]);
+ cseed[jLayer].SetX0(chamber->GetX());
+ cseed[jLayer].SetPadLength(padlength[jLayer]);
+
+ // fit extrapolated seed
+ if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
+ if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
+ AliTRDseedV1 tseed = cseed[jLayer];
+ if(!tseed.AttachClustersIter(chamber, 1000.)) continue;
+ cseed[jLayer] = tseed;
+ nusedf += cseed[jLayer].GetNUsed(); // debug value
+ FitTiltedRieman(cseed, kTRUE);
+ }
- // AliInfo("Extrapolation done.");
- // Debug Stream containing all the 6 tracklets
- if(AliTRDReconstructor::StreamLevel() >= 2){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- cstreamer << "MakeSeeds1"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "S0.=" << &cseed[0]
- << "S1.=" << &cseed[1]
- << "S2.=" << &cseed[2]
- << "S3.=" << &cseed[3]
- << "S4.=" << &cseed[4]
- << "S5.=" << &cseed[5]
- << "FitterT.=" << tiltedRieman
- << "\n";
- }
+ // AliInfo("Extrapolation done.");
+ // Debug Stream containing all the 6 tracklets
+ if(AliTRDReconstructor::StreamLevel() >= 2){
+ TTreeSRedirector &cstreamer = *fgDebugStreamer;
+ TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ cstreamer << "MakeSeeds1"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "S0.=" << &cseed[0]
+ << "S1.=" << &cseed[1]
+ << "S2.=" << &cseed[2]
+ << "S3.=" << &cseed[3]
+ << "S4.=" << &cseed[4]
+ << "S5.=" << &cseed[5]
+ << "FitterT.=" << tiltedRieman
+ << "\n";
+ }
- if(ImproveSeedQuality(stack, cseed) < 4){
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo("Improve seed quality done.");
-
- // fit full track and cook likelihoods
-// Double_t curv = FitRieman(&cseed[0], chi2);
-// Double_t chi2ZF = chi2[0] / TMath::Max((nlayers - 3.), 1.);
-// Double_t chi2RF = chi2[1] / TMath::Max((nlayers - 3.), 1.);
-
- // do the final track fitting (Once with vertex constraint and once without vertex constraint)
- Double_t chi2Vals[3];
- chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
- chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
- chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((nlayers - 3.), 1.);
- // Chi2 definitions in testing stage
- //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
- fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
- //AliInfo("Hyperplane fit done\n");
-
- // finalize tracklets
- Int_t labels[12];
- Int_t outlab[24];
- Int_t nlab = 0;
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- if (!cseed[iLayer].IsOK()) continue;
-
- if (cseed[iLayer].GetLabels(0) >= 0) {
- labels[nlab] = cseed[iLayer].GetLabels(0);
- nlab++;
- }
+ if(ImproveSeedQuality(stack, cseed) < 4){
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo("Improve seed quality done.");
+
+ // fit full track and cook likelihoods
+ // Double_t curv = FitRieman(&cseed[0], chi2);
+ // Double_t chi2ZF = chi2[0] / TMath::Max((nlayers - 3.), 1.);
+ // Double_t chi2RF = chi2[1] / TMath::Max((nlayers - 3.), 1.);
+
+ // do the final track fitting (Once with vertex constraint and once without vertex constraint)
+ Double_t chi2Vals[3];
+ chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
+ chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
+ chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((nlayers - 3.), 1.);
+ // Chi2 definitions in testing stage
+ //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
+ fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
+ //AliInfo("Hyperplane fit done\n");
+
+ // finalize tracklets
+ Int_t labels[12];
+ Int_t outlab[24];
+ Int_t nlab = 0;
+ for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
+ if (!cseed[iLayer].IsOK()) continue;
+
+ if (cseed[iLayer].GetLabels(0) >= 0) {
+ labels[nlab] = cseed[iLayer].GetLabels(0);
+ nlab++;
+ }
- if (cseed[iLayer].GetLabels(1) >= 0) {
- labels[nlab] = cseed[iLayer].GetLabels(1);
- nlab++;
- }
- }
- Freq(nlab,labels,outlab,kFALSE);
- Int_t label = outlab[0];
- Int_t frequency = outlab[1];
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- cseed[iLayer].SetFreq(frequency);
- cseed[iLayer].SetChi2Z(chi2[1]);
- }
-
- if(AliTRDReconstructor::StreamLevel() >= 2){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
- TLinearFitter *fitterT = GetTiltedRiemanFitter();
- cstreamer << "MakeSeeds2"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Chi2TR=" << chi2Vals[0]
- << "Chi2TC=" << chi2Vals[1]
- << "Nlayers=" << nlayers
- << "NUsedS=" << nUsedCl
- << "NUsed=" << nusedf
- << "Like=" << like
- << "S0.=" << &cseed[0]
- << "S1.=" << &cseed[1]
- << "S2.=" << &cseed[2]
- << "S3.=" << &cseed[3]
- << "S4.=" << &cseed[4]
- << "S5.=" << &cseed[5]
- << "Label=" << label
- << "Freq=" << frequency
- << "FitterT.=" << fitterT
- << "FitterTC.=" << fitterTC
- << "\n";
- }
+ if (cseed[iLayer].GetLabels(1) >= 0) {
+ labels[nlab] = cseed[iLayer].GetLabels(1);
+ nlab++;
+ }
+ }
+ Freq(nlab,labels,outlab,kFALSE);
+ Int_t label = outlab[0];
+ Int_t frequency = outlab[1];
+ for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
+ cseed[iLayer].SetFreq(frequency);
+ cseed[iLayer].SetChi2Z(chi2[1]);
+ }
+
+ if(AliTRDReconstructor::StreamLevel() >= 2){
+ TTreeSRedirector &cstreamer = *fgDebugStreamer;
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
+ TLinearFitter *fitterT = GetTiltedRiemanFitter();
+ cstreamer << "MakeSeeds2"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Chi2TR=" << chi2Vals[0]
+ << "Chi2TC=" << chi2Vals[1]
+ << "Nlayers=" << nlayers
+ << "NUsedS=" << nUsedCl
+ << "NUsed=" << nusedf
+ << "Like=" << like
+ << "S0.=" << &cseed[0]
+ << "S1.=" << &cseed[1]
+ << "S2.=" << &cseed[2]
+ << "S3.=" << &cseed[3]
+ << "S4.=" << &cseed[4]
+ << "S5.=" << &cseed[5]
+ << "Label=" << label
+ << "Freq=" << frequency
+ << "FitterT.=" << fitterT
+ << "FitterTC.=" << fitterTC
+ << "\n";
+ }
- ntracks++;
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- if(ntracks == kMaxTracksStack){
- AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
- for(int isl=0; isl<4; isl++) delete layer[isl];
- return ntracks;
- }
- cseed += 6;
+ ntracks++;
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ if(ntracks == kMaxTracksStack){
+ AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
+ for(int isl=0; isl<4; isl++) delete layer[isl];
+ return ntracks;
+ }
+ cseed += 6;
}
}
}
//_____________________________________________________________________________
AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
{
- //
- // Build a TRD track out of tracklet candidates
- //
- // Parameters :
- // seeds : array of tracklets
- // params : track parameters (see MakeSeeds() function body for a detailed description)
- //
- // Output :
- // The TRD track.
- //
- // Detailed description
- //
- // To be discussed with Marian !!
- //
-
- Double_t alpha = AliTRDgeometry::GetAlpha();
- Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
- Double_t c[15];
-
- c[ 0] = 0.2;
- c[ 1] = 0.0; c[ 2] = 2.0;
- c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
- c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
- c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
-
- AliTRDtrackV1 *track = new AliTRDtrackV1(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
+ //
+ // Build a TRD track out of tracklet candidates
+ //
+ // Parameters :
+ // seeds : array of tracklets
+ // params : track parameters (see MakeSeeds() function body for a detailed description)
+ //
+ // Output :
+ // The TRD track.
+ //
+ // Detailed description
+ //
+ // To be discussed with Marian !!
+ //
+
+ AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
+ if (!calibra) AliInfo("Could not get Calibra instance\n");
+
+ Double_t alpha = AliTRDgeometry::GetAlpha();
+ Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
+ Double_t c[15];
+
+ c[ 0] = 0.2;
+ c[ 1] = 0.0; c[ 2] = 2.0;
+ c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
+ c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
+ c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
+
+ AliTRDtrackV1 *track = new AliTRDtrackV1(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
track->PropagateTo(params[0]-5.0);
- track->ResetCovariance(1);
- Int_t nc = FollowBackProlongation(*track);
+ track->ResetCovariance(1);
+ Int_t nc = FollowBackProlongation(*track);
//AliInfo(Form("N clusters for track %d", nc));
if (nc < 30) {
- delete track;
- track = 0x0;
- } else {
- track->CookdEdx();
- track->CookdEdxTimBin(-1);
- track->CookLabel(.9);
- }
-
- return track;
+ delete track;
+ track = 0x0;
+ } else {
+ track->CookdEdx();
+ track->CookdEdxTimBin(-1);
+ track->CookLabel(.9);
+ // computes PID for track
+ track->CookPID();
+ // update calibration references using this track
+ if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(track);
+ }
+
+ return track;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
{
- //
- // Sort tracklets according to "quality" and try to "improve" the first 4 worst
- //
- // Parameters :
- // layers : Array of propagation layers for a stack/supermodule
- // cseed : Array of 6 seeding tracklets which has to be improved
- //
- // Output :
- // cssed : Improved seeds
- //
- // Detailed description
- //
- // Iterative procedure in which new clusters are searched for each
- // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
- // can be maximized. If some optimization is found the old seeds are replaced.
- //
+ //
+ // Sort tracklets according to "quality" and try to "improve" the first 4 worst
+ //
+ // Parameters :
+ // layers : Array of propagation layers for a stack/supermodule
+ // cseed : Array of 6 seeding tracklets which has to be improved
+ //
+ // Output :
+ // cssed : Improved seeds
+ //
+ // Detailed description
+ //
+ // Iterative procedure in which new clusters are searched for each
+ // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
+ // can be maximized. If some optimization is found the old seeds are replaced.
+ //
// debug level: 7
//
TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
TTreeSRedirector &cstreamer = *fgDebugStreamer;
cstreamer << "ImproveSeedQuality"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Iteration=" << iter
- << "S0.=" << &bseed[0]
- << "S1.=" << &bseed[1]
- << "S2.=" << &bseed[2]
- << "S3.=" << &bseed[3]
- << "S4.=" << &bseed[4]
- << "S5.=" << &bseed[5]
- << "FitterT.=" << tiltedRieman
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Iteration=" << iter
+ << "S0.=" << &bseed[0]
+ << "S1.=" << &bseed[1]
+ << "S2.=" << &bseed[2]
+ << "S3.=" << &bseed[3]
+ << "S4.=" << &bseed[4]
+ << "S5.=" << &bseed[5]
+ << "FitterT.=" << tiltedRieman
+ << "\n";
}
} // Loop: iter
//_________________________________________________________________________
Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
-//
-// Calculates the Track Likelihood value. This parameter serves as main quality criterion for
-// the track selection
-// The likelihood value containes:
-// - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
-// - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
-// For all Parameters an exponential dependency is used
-//
-// Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
-// - Array of chi2 values:
-// * Non-Constrained Tilted Riemann fit
-// * Vertex-Constrained Tilted Riemann fit
-// * z-Direction from Linear fit
-// Output: - The calculated track likelihood
-//
-// debug level 2
-//
+ //
+ // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
+ // the track selection
+ // The likelihood value containes:
+ // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
+ // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
+ // For all Parameters an exponential dependency is used
+ //
+ // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
+ // - Array of chi2 values:
+ // * Non-Constrained Tilted Riemann fit
+ // * Vertex-Constrained Tilted Riemann fit
+ // * z-Direction from Linear fit
+ // Output: - The calculated track likelihood
+ //
+ // debug level 2
+ //
Double_t sumdaf = 0, nLayers = 0;
for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
TTreeSRedirector &cstreamer = *fgDebugStreamer;
cstreamer << "CalculateTrackLikelihood0"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "LikeChi2Z=" << likeChi2Z
- << "LikeChi2TR=" << likeChi2TR
- << "LikeChi2TC=" << likeChi2TC
- << "LikeAF=" << likeAF
- << "TrackLikelihood=" << trackLikelihood
- << "\n";
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "LikeChi2Z=" << likeChi2Z
+ << "LikeChi2TR=" << likeChi2TR
+ << "LikeChi2TC=" << likeChi2TC
+ << "LikeAF=" << likeAF
+ << "TrackLikelihood=" << trackLikelihood
+ << "\n";
}
return trackLikelihood;
//____________________________________________________________________
Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]
- , Double_t *chi2)
+ , Double_t *chi2)
{
- //
- // Calculate the probability of this track candidate.
- //
- // Parameters :
- // cseeds : array of candidate tracklets
- // planes : array of seeding planes (see seeding configuration)
- // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
- //
- // Output :
- // likelihood value
- //
- // Detailed description
- //
- // The track quality is estimated based on the following 4 criteria:
- // 1. precision of the rieman fit on the Y direction (likea)
- // 2. chi2 on the Y direction (likechi2y)
- // 3. chi2 on the Z direction (likechi2z)
- // 4. number of attached clusters compared to a reference value
- // (see AliTRDrecoParam::fkFindable) (likeN)
- //
- // The distributions for each type of probabilities are given below as of
- // (date). They have to be checked to assure consistency of estimation.
- //
-
+ //
+ // Calculate the probability of this track candidate.
+ //
+ // Parameters :
+ // cseeds : array of candidate tracklets
+ // planes : array of seeding planes (see seeding configuration)
+ // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
+ //
+ // Output :
+ // likelihood value
+ //
+ // Detailed description
+ //
+ // The track quality is estimated based on the following 4 criteria:
+ // 1. precision of the rieman fit on the Y direction (likea)
+ // 2. chi2 on the Y direction (likechi2y)
+ // 3. chi2 on the Z direction (likechi2z)
+ // 4. number of attached clusters compared to a reference value
+ // (see AliTRDrecoParam::fkFindable) (likeN)
+ //
+ // The distributions for each type of probabilities are given below as of
+ // (date). They have to be checked to assure consistency of estimation.
+ //
+
// ratio of the total number of clusters/track which are expected to be found by the tracker.
Float_t fgFindable = AliTRDReconstructor::RecoParam()->GetFindableClusters();
Double_t like = likea * likechi2y * likechi2z * likeN;
-// 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));
+ // 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));
if(AliTRDReconstructor::StreamLevel() >= 2){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
// The Debug Stream contains the seed
TTreeSRedirector &cstreamer = *fgDebugStreamer;
cstreamer << "CookLikelihood"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "tracklet0.=" << &cseed[0]
- << "tracklet1.=" << &cseed[1]
- << "tracklet2.=" << &cseed[2]
- << "tracklet3.=" << &cseed[3]
- << "tracklet4.=" << &cseed[4]
- << "tracklet5.=" << &cseed[5]
- << "sumda=" << sumda
- << "chi0=" << chi2[0]
- << "chi1=" << chi2[1]
- << "likea=" << likea
- << "likechi2y=" << likechi2y
- << "likechi2z=" << likechi2z
- << "nclusters=" << nclusters
- << "likeN=" << likeN
- << "like=" << like
- << "\n";
- }
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "tracklet0.=" << &cseed[0]
+ << "tracklet1.=" << &cseed[1]
+ << "tracklet2.=" << &cseed[2]
+ << "tracklet3.=" << &cseed[3]
+ << "tracklet4.=" << &cseed[4]
+ << "tracklet5.=" << &cseed[5]
+ << "sumda=" << sumda
+ << "chi0=" << chi2[0]
+ << "chi1=" << chi2[1]
+ << "likea=" << likea
+ << "likechi2y=" << likechi2y
+ << "likechi2z=" << likechi2z
+ << "nclusters=" << nclusters
+ << "likeN=" << likeN
+ << "like=" << like
+ << "\n";
+ }
return like;
}
//____________________________________________________________________
void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
{
- //
- // Map seeding configurations to detector planes.
- //
- // Parameters :
- // iconfig : configuration index
- // planes : member planes of this configuration. On input empty.
- //
- // Output :
- // planes : contains the planes which are defining the configuration
- //
- // Detailed description
- //
- // Here is the list of seeding planes configurations together with
- // their topological classification:
- //
- // 0 - 5432 TQ 0
- // 1 - 4321 TQ 0
- // 2 - 3210 TQ 0
- // 3 - 5321 TQ 1
- // 4 - 4210 TQ 1
- // 5 - 5431 TQ 1
- // 6 - 4320 TQ 1
- // 7 - 5430 TQ 2
- // 8 - 5210 TQ 2
- // 9 - 5421 TQ 3
- // 10 - 4310 TQ 3
- // 11 - 5410 TQ 4
- // 12 - 5420 TQ 5
- // 13 - 5320 TQ 5
- // 14 - 5310 TQ 5
- //
- // The topologic quality is modeled as follows:
- // 1. The general model is define by the equation:
- // p(conf) = exp(-conf/2)
- // 2. According to the topologic classification, configurations from the same
- // class are assigned the agerage value over the model values.
- // 3. Quality values are normalized.
- //
- // The topologic quality distribution as function of configuration is given below:
- //Begin_Html
- // <img src="gif/topologicQA.gif">
- //End_Html
- //
+ //
+ // Map seeding configurations to detector planes.
+ //
+ // Parameters :
+ // iconfig : configuration index
+ // planes : member planes of this configuration. On input empty.
+ //
+ // Output :
+ // planes : contains the planes which are defining the configuration
+ //
+ // Detailed description
+ //
+ // Here is the list of seeding planes configurations together with
+ // their topological classification:
+ //
+ // 0 - 5432 TQ 0
+ // 1 - 4321 TQ 0
+ // 2 - 3210 TQ 0
+ // 3 - 5321 TQ 1
+ // 4 - 4210 TQ 1
+ // 5 - 5431 TQ 1
+ // 6 - 4320 TQ 1
+ // 7 - 5430 TQ 2
+ // 8 - 5210 TQ 2
+ // 9 - 5421 TQ 3
+ // 10 - 4310 TQ 3
+ // 11 - 5410 TQ 4
+ // 12 - 5420 TQ 5
+ // 13 - 5320 TQ 5
+ // 14 - 5310 TQ 5
+ //
+ // The topologic quality is modeled as follows:
+ // 1. The general model is define by the equation:
+ // p(conf) = exp(-conf/2)
+ // 2. According to the topologic classification, configurations from the same
+ // class are assigned the agerage value over the model values.
+ // 3. Quality values are normalized.
+ //
+ // The topologic quality distribution as function of configuration is given below:
+ //Begin_Html
+
// <img src="gif/topologicQA.gif">
+ //End_Html
+ //
switch(iconfig){
case 0: // 5432 TQ 0
//____________________________________________________________________
void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
{
- //
- // Returns the extrapolation planes for a seeding configuration.
- //
- // Parameters :
- // iconfig : configuration index
- // planes : planes which are not in this configuration. On input empty.
- //
- // Output :
- // planes : contains the planes which are not in the configuration
- //
- // Detailed description
- //
+ //
+ // Returns the extrapolation planes for a seeding configuration.
+ //
+ // Parameters :
+ // iconfig : configuration index
+ // planes : planes which are not in this configuration. On input empty.
+ //
+ // Output :
+ // planes : contains the planes which are not in the configuration
+ //
+ // Detailed description
+ //
switch(iconfig){
case 0: // 5432 TQ 0
//____________________________________________________________________
Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
-//
-// Calculates the reference x-position for the tilted Rieman fit defined as middle
-// of the stack (middle between layers 2 and 3). For the calculation all the tracklets
-// are taken into account
-//
-// Parameters: - Array of tracklets(AliTRDseedV1)
-//
-// Output: - The reference x-position(Float_t)
-//
+ //
+ // Calculates the reference x-position for the tilted Rieman fit defined as middle
+ // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
+ // are taken into account
+ //
+ // Parameters: - Array of tracklets(AliTRDseedV1)
+ //
+ // Output: - The reference x-position(Float_t)
+ //
Int_t nDistances = 0;
Float_t meanDistance = 0.;
Int_t startIndex = 5;
// Strategy avoids a division by 0;
for(Int_t il = 5; il >= 0; il--){
if(tracklets[il].IsOK()){
- xpos[iok] = tracklets[il].GetX0();
- iok++;
- startIndex = il;
+ xpos[iok] = tracklets[il].GetX0();
+ iok++;
+ startIndex = il;
}
if(iok) idiff++; // to get the right difference;
if(iok > 1) break;
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
- , Int_t *outlist, Bool_t down)
+ , Int_t *outlist, Bool_t down)
{
- //
- // Sort eleements according occurancy
- // The size of output array has is 2*n
- //
-
- if (n <= 0) {
- return 0;
- }
-
- Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
- Int_t *sindexF = new Int_t[2*n];
- for (Int_t i = 0; i < n; i++) {
- sindexF[i] = 0;
- }
-
- TMath::Sort(n,inlist,sindexS,down);
-
- Int_t last = inlist[sindexS[0]];
- Int_t val = last;
- sindexF[0] = 1;
- sindexF[0+n] = last;
- Int_t countPos = 0;
-
- // Find frequency
- for (Int_t i = 1; i < n; i++) {
- val = inlist[sindexS[i]];
- if (last == val) {
- sindexF[countPos]++;
- }
- else {
- countPos++;
- sindexF[countPos+n] = val;
- sindexF[countPos]++;
- last = val;
- }
- }
- if (last == val) {
- countPos++;
- }
-
- // Sort according frequency
- TMath::Sort(countPos,sindexF,sindexS,kTRUE);
-
- for (Int_t i = 0; i < countPos; i++) {
- outlist[2*i ] = sindexF[sindexS[i]+n];
- outlist[2*i+1] = sindexF[sindexS[i]];
- }
-
- delete [] sindexS;
- delete [] sindexF;
-
- return countPos;
+ //
+ // Sort eleements according occurancy
+ // The size of output array has is 2*n
+ //
+
+ if (n <= 0) {
+ return 0;
+ }
+
+ Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
+ Int_t *sindexF = new Int_t[2*n];
+ for (Int_t i = 0; i < n; i++) {
+ sindexF[i] = 0;
+ }
+
+ TMath::Sort(n,inlist,sindexS,down);
+
+ Int_t last = inlist[sindexS[0]];
+ Int_t val = last;
+ sindexF[0] = 1;
+ sindexF[0+n] = last;
+ Int_t countPos = 0;
+
+ // Find frequency
+ for (Int_t i = 1; i < n; i++) {
+ val = inlist[sindexS[i]];
+ if (last == val) {
+ sindexF[countPos]++;
+ }
+ else {
+ countPos++;
+ sindexF[countPos+n] = val;
+ sindexF[countPos]++;
+ last = val;
+ }
+ }
+ if (last == val) {
+ countPos++;
+ }
+
+ // Sort according frequency
+ TMath::Sort(countPos,sindexF,sindexS,kTRUE);
+
+ for (Int_t i = 0; i < countPos; i++) {
+ outlist[2*i ] = sindexF[sindexS[i]+n];
+ outlist[2*i+1] = sindexF[sindexS[i]];
+ }
+
+ delete [] sindexS;
+ delete [] sindexF;
+
+ return countPos;
}
//_____________________________________________________________________________
Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
{
-// Chi2 definition on y-direction
+ // Chi2 definition on y-direction
Float_t chi2 = 0;
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
//_____________________________________________________________________________
Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
{
-// Chi2 definition on z-direction
+ // Chi2 definition on z-direction
Float_t chi2 = 0;
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
}
return chi2;
}
+
+///////////////////////////////////////////////////////
+// //
+// Resources of class AliTRDLeastSquare //
+// //
+///////////////////////////////////////////////////////
+
+//_____________________________________________________________________________
+AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
+ //
+ // Constructor of the nested class AliTRDtrackFitterLeastSquare
+ //
+ memset(fParams, 0, sizeof(Double_t) * 2);
+ memset(fSums, 0, sizeof(Double_t) * 5);
+ memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
+
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
+ //
+ // Adding Point to the fitter
+ //
+ Double_t weight = 1/(sigmaY * sigmaY);
+ Double_t &xpt = *x;
+ // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
+ fSums[0] += weight;
+ fSums[1] += weight * xpt;
+ fSums[2] += weight * y;
+ fSums[3] += weight * xpt * y;
+ fSums[4] += weight * xpt * xpt;
+ fSums[5] += weight * y * y;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
+ //
+ // Remove Point from the sample
+ //
+ Double_t weight = 1/(sigmaY * sigmaY);
+ Double_t &xpt = *x;
+ fSums[0] -= weight;
+ fSums[1] -= weight * xpt;
+ fSums[2] -= weight * y;
+ fSums[3] -= weight * xpt * y;
+ fSums[4] -= weight * xpt * xpt;
+ fSums[5] -= weight * y * y;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
+ //
+ // Evaluation of the fit:
+ // Calculation of the parameters
+ // Calculation of the covariance matrix
+ //
+
+ Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
+ // for(Int_t isum = 0; isum < 5; isum++)
+ // printf("fSums[%d] = %f\n", isum, fSums[isum]);
+ // printf("denominator = %f\n", denominator);
+ fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
+ fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
+ // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
+
+ // Covariance matrix
+ fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
+ fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
+ fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
+ //
+ // Returns the Function value of the fitted function at a given x-position
+ //
+ return fParams[0] + fParams[1] * (*xpos);
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
+ //
+ // Copies the values of the covariance matrix into the storage
+ //
+ memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
+}
+
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