// //
///////////////////////////////////////////////////////////////////////////////
-// #include <Riostream.h>
-// #include <stdio.h>
-// #include <string.h>
-
#include <TBranch.h>
#include <TDirectory.h>
#include <TLinearFitter.h>
#include "AliTRDrecoParam.h"
#include "AliTRDcluster.h"
+#include "AliTRDdigitsParam.h"
#include "AliTRDseedV1.h"
#include "AliTRDtrackV1.h"
#include "AliTRDtrackerV1.h"
#include "AliTRDtrackingChamber.h"
#include "AliTRDchamberTimeBin.h"
-
-
ClassImp(AliTRDtrackerV1)
-
+ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
+ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
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,
+ 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
0.0474, 0.0408, 0.0335, 0.0335, 0.0335
-};
+};
+const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
+ 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
Int_t AliTRDtrackerV1::fgNTimeBins = 0;
-AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
-TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
-TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
+AliRieman* AliTRDtrackerV1::fgRieman = NULL;
+TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
+TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
//____________________________________________________________________
AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
:AliTracker()
- ,fReconstructor(0x0)
- ,fGeom(0x0)
- ,fClusters(0x0)
- ,fTracklets(0x0)
- ,fTracks(0x0)
+ ,fkReconstructor(NULL)
+ ,fGeom(NULL)
+ ,fClusters(NULL)
+ ,fTracklets(NULL)
+ ,fTracks(NULL)
,fSieveSeeding(0)
{
//
}
fGeom = new AliTRDgeometry();
fGeom->CreateClusterMatrixArray();
- TGeoHMatrix *matrix = 0x0;
+ TGeoHMatrix *matrix = NULL;
Double_t loc[] = {0., 0., 0.};
Double_t glb[] = {0., 0., 0.};
for(Int_t ily=kNPlanes; ily--;){
- if(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, 0)))){
- AliFatal(Form("Could not get matrix for chamber @ 0 2 %d.", ily));
+ Int_t ism = 0;
+ while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
+ if(!matrix){
+ AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
+ fR[ily] = fgkX0[ily];
continue;
}
matrix->LocalToMaster(loc, glb);
fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
}
- // initialize calibration values
- AliTRDcalibDB *trd = 0x0;
- if (!(trd = AliTRDcalibDB::Instance())) {
- AliFatal("Could not get calibration.");
- }
- if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
-
// initialize cluster containers
for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
// Destructor
//
- if(fgRieman) delete fgRieman; fgRieman = 0x0;
- if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
- if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
+ if(fgRieman) delete fgRieman; fgRieman = NULL;
+ if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
+ if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
if(fTracks) {fTracks->Delete(); delete fTracks;}
if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
// See AliTRDtrackerV1::Clusters2TracksSM() for details.
//
- if(!fReconstructor->GetRecoParam() ){
+ if(!fkReconstructor->GetRecoParam() ){
AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
return 0;
}
//AliInfo(Form("Processing supermodule %i ...", ism));
ntracks += Clusters2TracksSM(ism, esd);
}
- AliInfo(Form("Number of found tracks : %d", ntracks));
+ AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks));
return ntracks;
}
if (!tracklet) return kFALSE;
// get detector for this tracklet
- Int_t idet = tracklet->GetDetector();
-
+ Int_t det = tracklet->GetDetector();
+ Int_t sec = fGeom->GetSector(det);
+ Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
+ sinA = TMath::Sin(alpha),
+ cosA = TMath::Cos(alpha);
Double_t local[3];
- local[0] = tracklet->GetX0();
- local[1] = tracklet->GetYfit(0);
- local[2] = tracklet->GetZfit(0);
+ local[0] = tracklet->GetX();
+ local[1] = tracklet->GetY();
+ local[2] = tracklet->GetZ();
Double_t global[3];
- fGeom->RotateBack(idet, local, global);
- p.SetXYZ(global[0],global[1],global[2]);
-
+ fGeom->RotateBack(det, local, global);
+
+ Double_t cov2D[3]; Float_t cov[6];
+ tracklet->GetCovAt(local[0], cov2D);
+ cov[0] = cov2D[0]*sinA*sinA;
+ cov[1] =-cov2D[0]*sinA*cosA;
+ cov[2] =-cov2D[1]*sinA;
+ cov[3] = cov2D[0]*cosA*cosA;
+ cov[4] = cov2D[1]*cosA;
+ cov[5] = cov2D[2];
+ // store the global position of the tracklet and its covariance matrix in the track point
+ p.SetXYZ(global[0],global[1],global[2], cov);
// setting volume id
- AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
- switch (fGeom->GetLayer(idet)) {
- case 0:
- iLayer = AliGeomManager::kTRD1;
- break;
- case 1:
- iLayer = AliGeomManager::kTRD2;
- break;
- case 2:
- iLayer = AliGeomManager::kTRD3;
- break;
- case 3:
- iLayer = AliGeomManager::kTRD4;
- break;
- case 4:
- iLayer = AliGeomManager::kTRD5;
- break;
- case 5:
- iLayer = AliGeomManager::kTRD6;
- break;
- };
- Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
+ AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
+ Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
p.SetVolumeID(volid);
//_____________________________________________________________________________
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.
- //
-
- // Calibration monitor
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
+// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
+// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
+// covariance, PID, etc.) are than used to update the corresponding ESD track.
+// Each track seed is first propagated to the geometrical limit of the TRD detector.
+// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
+// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
+// Otherwise the ESD track is left unchanged.
+//
+// The following steps are performed:
+// 1. Selection of tracks based on the variance in the y-z plane.
+// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
+// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
+// the following status bits:
+// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
+// - AliESDtrack::kTRDStop - if the tracks fails propagation
+// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
+// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
+// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
+//
+
+ AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
if (!calibra) AliInfo("Could not get Calibra instance\n");
-
+ if(!fgNTimeBins) CookNTimeBins();
+
// Define scalers
Int_t nFound = 0, // number of tracks found
nSeeds = 0, // total number of ESD seeds
nTPCseeds= 0; // number of TPC seeds
Float_t foundMin = 20.0;
- Float_t *quality = 0x0;
- Int_t *index = 0x0;
+ Float_t *quality = NULL;
+ Int_t *index = NULL;
nSeeds = event->GetNumberOfTracks();
// Sort tracks according to quality
// (covariance in the yz plane)
seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
// prepare track and do propagation in the TRD
- track.SetReconstructor(fReconstructor);
+ track.SetReconstructor(fkReconstructor);
track.SetKink(Bool_t(seed->GetKinkIndex(0)));
expectedClr = FollowBackProlongation(track);
// check if track entered the TRD fiducial volume
// update calibration references using this track
if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
// save calibration object
- if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
+ if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
calibTrack->SetOwner();
seed->AddCalibObject(calibTrack);
//(with the help of Annalisa de Caro Mar-17-2009)
if(gGeoManager){
gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
- TGeoHMatrix *m = 0x0;
+ TGeoHMatrix *m = NULL;
Double_t loc[]={0., 0., -.5*29.05}, glob[3];
if((m=gGeoManager->GetCurrentMatrix())){
}
if(index) delete [] index;
if(quality) delete [] quality;
-
- AliInfo(Form("Number of TPC seeds: %d (%d)", nTRDseeds, nTPCseeds));
- AliInfo(Form("Number of propagated TRD tracks: %d", nFound));
-
+ AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
+ AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
+
// run stand alone tracking
- if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
+ if (fkReconstructor->IsSeeding()) Clusters2Tracks(event);
return 0;
}
}
// Update the friend track
- if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
- TObject *o = 0x0; Int_t ic = 0;
- AliTRDtrackV1 *calibTrack = 0x0;
+ if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
+ TObject *o = NULL; Int_t ic = 0;
+ AliTRDtrackV1 *calibTrack = NULL;
while((o = seed->GetCalibObject(ic++))){
if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
calibTrack->SetTrackHigh(track.GetTrackHigh());
if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
}
}
- AliInfo(Form("Number of loaded seeds: %d",nseed));
- AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
+ AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
+ AliInfo(Form("Number of tracks: TRDrefit[%d]", found));
return 0;
}
Bool_t kStoreIn = kTRUE;
Int_t nClustersExpected = 0;
for (Int_t iplane = kNPlanes; iplane--;) {
- Int_t index = 0;
+ Int_t index(-1);
AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
+ AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
if(!tracklet) continue;
- if(!tracklet->IsOK()) AliWarning("tracklet not OK");
-
+ if(!tracklet->IsOK()){
+ AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
+ continue;
+ }
Double_t x = tracklet->GetX();//GetX0();
// reject tracklets which are not considered for inward refit
if(x > t.GetX()+fgkMaxStep) continue;
kStoreIn = kFALSE;
}
- Double_t maxChi2 = t.GetPredictedChi2(tracklet);
- if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
+ Double_t cov[3]; tracklet->GetCovAt(x, cov);
+ Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
+ if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
nClustersExpected += tracklet->GetN();
}
}
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){
Int_t index;
for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
t.SetTracklet(tracklet, index);
}
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
- AliTRDtrackV1 track(t);
- track.SetOwner();
- cstreamer << "FollowProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &track
- << "\n";
+ if(fkReconstructor->IsDebugStreaming()){
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
+ AliTRDtrackV1 track(t);
+ track.SetOwner();
+ cstreamer << "FollowProlongation"
+ << "EventNumber=" << eventNumber
+ << "ncl=" << nClustersExpected
+ << "track.=" << &track
+ << "\n";
+ }
}
-
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/Build 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
+//
+// 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. Propagate track to the entrance of the next chamber:
+// - get chamber limits in the radial direction
+// - check crossing sectors
+// - check track inclination
+// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
+// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
+// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
+// 3. Fit tracklet using the information from the Kalman filter.
+// 4. Propagate and update track at reference radial position of the tracklet.
+// 5. Register tracklet with the tracker and track; update pulls monitoring.
+//
+// Observation
+// 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
+// - AliTRDtrackV1::kProlongation : track prolongation failed
+// - AliTRDtrackV1::kPropagation : track prolongation failed
+// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
+// - AliTRDtrackV1::kSnp : too large bending
+// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
+// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
+// - AliTRDtrackV1::kUnknown : anything which is not covered before
+// 2. By default the status of the track before first TRD update is saved.
+//
+// Debug level 2
+//
+// Author
+// Alexandru Bercuci <A.Bercuci@gsi.de>
+//
Int_t n = 0;
Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
- AliTRDtrackingChamber *chamber = 0x0;
+ AliTRDtrackingChamber *chamber = NULL;
- AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
+ Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
+ TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
+
+ AliTRDseedV1 tracklet, *ptrTracklet = NULL;
// in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
AliTRDseedV1 *tracklets[kNPlanes];
memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
tracklets[ip] = t.GetTracklet(ip);
t.UnsetTracklet(ip);
}
- Bool_t kStoreIn = kTRUE;
+ Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
// Loop through the TRD layers
- TGeoHMatrix *matrix = 0x0;
+ TGeoHMatrix *matrix = NULL;
Double_t x, y, z;
for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
+ AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
+
// rough estimate of the entry point
if (!t.GetProlongation(fR[ily], y, z)){
n=-1;
t.SetStatus(AliTRDtrackV1::kProlongation);
+ AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
break;
}
// TODO cross check with y value !
stk = fGeom->GetStack(z, ily);
det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
- matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
+ matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL;
+ AliDebug(3, Form("Propagate to det[%3d]", det));
// check if supermodule/chamber is installed
if( !fGeom->GetSMstatus(sm) ||
stk<0. ||
fGeom->IsHole(ily, stk, sm) ||
!matrix ){
+ AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
// propagate to the default radial position
if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
n=-1;
t.SetStatus(AliTRDtrackV1::kPropagation);
+ AliDebug(4, "Failed Propagation [Missing Geometry]");
break;
}
if(!AdjustSector(&t)){
n=-1;
t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
break;
}
if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
n=-1;
t.SetStatus(AliTRDtrackV1::kSnp);
+ AliDebug(4, "Failed Max Snp [Missing Geometry]");
break;
}
t.SetStatus(AliTRDtrackV1::kGeometry, ily);
if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
n=-1;
t.SetStatus(AliTRDtrackV1::kPropagation);
+ AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
break;
}
if(!AdjustSector(&t)){
n=-1;
t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ AliDebug(4, "Failed Adjust Sector Start");
break;
}
if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
n=-1;
t.SetStatus(AliTRDtrackV1::kSnp);
+ AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
break;
}
- Bool_t RECALCULATE = kFALSE;
+ Bool_t doRecalculate = kFALSE;
if(sm != t.GetSector()){
sm = t.GetSector();
- RECALCULATE = kTRUE;
+ doRecalculate = kTRUE;
}
if(stk != fGeom->GetStack(z, ily)){
stk = fGeom->GetStack(z, ily);
- RECALCULATE = kTRUE;
+ doRecalculate = kTRUE;
}
- if(RECALCULATE){
+ if(doRecalculate){
det = AliTRDgeometry::GetDetector(ily, stk, sm);
if(!(matrix = fGeom->GetClusterMatrix(det))){
t.SetStatus(AliTRDtrackV1::kGeometry, ily);
+ AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
continue;
}
matrix->LocalToMaster(loc, glb);
if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
n=-1;
t.SetStatus(AliTRDtrackV1::kProlongation);
+ AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z));
break;
}
if(fGeom->IsOnBoundary(det, y, z, .5)){
t.SetStatus(AliTRDtrackV1::kBoundary, ily);
+ AliDebug(4, "Failed Track on Boundary");
continue;
}
// mark track as entering the FIDUCIAL volume of TRD
ptrTracklet = tracklets[ily];
if(!ptrTracklet){ // BUILD TRACKLET
+ AliDebug(3, Form("Building tracklet det[%d]", det));
// check data in supermodule
if(!fTrSec[sm].GetNChambers()){
t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ AliDebug(4, "Failed NoClusters");
continue;
}
if(fTrSec[sm].GetX(ily) < 1.){
t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ AliDebug(4, "Failed NoX");
continue;
}
// check data in chamber
if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ AliDebug(4, "Failed No Detector");
continue;
}
- if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
+ if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ AliDebug(4, "Failed Not Enough Clusters in Detector");
continue;
}
// build tracklet
ptrTracklet = new(&tracklet) AliTRDseedV1(det);
- ptrTracklet->SetReconstructor(fReconstructor);
+ ptrTracklet->SetReconstructor(fkReconstructor);
ptrTracklet->SetKink(t.IsKink());
ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
ptrTracklet->SetX0(glb[0]+driftLength);
if(!tracklet.Init(&t)){
n=-1;
t.SetStatus(AliTRDtrackV1::kTrackletInit);
+ AliDebug(4, "Failed Tracklet Init");
break;
}
if(!tracklet.AttachClusters(chamber, kTRUE)){
t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
+ if(debugLevel>3){
+ AliTRDseedV1 trackletCp(*ptrTracklet);
+ UChar_t status(t.GetStatusTRD(ily));
+ (*cstreamer) << "FollowBackProlongation2"
+ <<"status=" << status
+ <<"tracklet.=" << &trackletCp
+ << "\n";
+ }
+ AliDebug(4, "Failed Attach Clusters");
continue;
}
- if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
+ AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN()));
+ if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){
t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
+ if(debugLevel>3){
+ AliTRDseedV1 trackletCp(*ptrTracklet);
+ UChar_t status(t.GetStatusTRD(ily));
+ (*cstreamer) << "FollowBackProlongation2"
+ <<"status=" << status
+ <<"tracklet.=" << &trackletCp
+ << "\n";
+ }
+ AliDebug(4, "Failed N Clusters Attached");
continue;
}
ptrTracklet->UpdateUsed();
- }
-
+ } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
// propagate track to the radial position of the tracklet
ptrTracklet->UseClusters(); // TODO ? do we need this here ?
// fit tracklet no tilt correction
if(!ptrTracklet->Fit(kFALSE)){
t.SetStatus(AliTRDtrackV1::kNoFit, ily);
+ AliDebug(4, "Failed Tracklet Fit");
continue;
}
x = ptrTracklet->GetX(); //GetX0();
if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
n=-1;
t.SetStatus(AliTRDtrackV1::kPropagation);
+ AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
break;
}
if(!AdjustSector(&t)) {
n=-1;
t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ AliDebug(4, "Failed Adjust Sector");
break;
}
if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
n=-1;
t.SetStatus(AliTRDtrackV1::kSnp);
+ AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp));
break;
}
-
+ if(kPropagateIn){
+ t.SetTrackLow();
+ kPropagateIn = kFALSE;
+ }
+ Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
+ Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
// update Kalman with the TRD measurement
- Double_t chi2 = t.GetPredictedChi2(ptrTracklet);
- if(chi2>1e+10){
+ if(chi2>1e+10){ // TODO
t.SetStatus(AliTRDtrackV1::kChi2, ily);
+ if(debugLevel > 2){
+ UChar_t status(t.GetStatusTRD());
+ AliTRDseedV1 trackletCp(*ptrTracklet);
+ AliTRDtrackV1 trackCp(t);
+ trackCp.SetOwner();
+ (*cstreamer) << "FollowBackProlongation1"
+ << "status=" << status
+ << "tracklet.=" << &trackletCp
+ << "track.=" << &trackCp
+ << "\n";
+ }
+ AliDebug(4, Form("Failed Chi2[%f]", chi2));
continue;
}
- if(!t.Update(ptrTracklet, chi2)) {
+ if(!t.Update(p, cov, chi2)) {
n=-1;
t.SetStatus(AliTRDtrackV1::kUpdate);
+ if(debugLevel > 2){
+ UChar_t status(t.GetStatusTRD());
+ AliTRDseedV1 trackletCp(*ptrTracklet);
+ AliTRDtrackV1 trackCp(t);
+ trackCp.SetOwner();
+ (*cstreamer) << "FollowBackProlongation1"
+ << "status=" << status
+ << "tracklet.=" << &trackletCp
+ << "track.=" << &trackCp
+ << "\n";
+ }
+ AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1]));
break;
}
+ // fill residuals ?!
+ AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
+
// load tracklet to the tracker
- ptrTracklet->UpDate(&t);
+ ptrTracklet->Update(&t);
ptrTracklet = SetTracklet(ptrTracklet);
- t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
+ Int_t index(fTracklets->GetEntriesFast()-1);
+ t.SetTracklet(ptrTracklet, index);
n += ptrTracklet->GetN();
+ AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
// Reset material budget if 2 consecutive gold
// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
//printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
//for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ if(debugLevel > 1){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
AliTRDtrackV1 track(t);
track.SetOwner();
- cstreamer << "FollowBackProlongation"
+ (*cstreamer) << "FollowBackProlongation0"
<< "EventNumber=" << eventNumber
<< "ncl=" << n
<< "track.=" << &track
}
//_________________________________________________________________________
-Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
+Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const 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
//
AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
fitter->Reset();
- for(Int_t i = 0; i < 4; i++)
- fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
+ for(Int_t i = 0; i < 4; i++){
+ fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
+ }
fitter->Update();
TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
fitter->StoreData(kTRUE);
fitter->ClearPoints();
- AliTRDcluster *cl = 0x0;
+ AliTRDcluster *cl = NULL;
Float_t x, y, z, w, t, error, tilt;
Double_t uvt[2];
for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
if(!tracklets[ilr].IsUsable(itb)) continue;
cl = tracklets[ilr].GetClusters(itb);
+ if(!cl->IsInChamber()) continue;
x = cl->GetX();
y = cl->GetY();
z = cl->GetZ();
uvt[0] = 2. * x * t;
uvt[1] = 2. * x * t * tilt ;
w = 2. * (y + tilt * (z - zVertex)) * t;
- error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t;
+ error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
fitter->AddPoint(uvt, w, error);
nPoints++;
}
for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
tracklets[ip].SetC(curvature);
-/* if(fReconstructor->GetStreamLevel() >= 5){
+/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){
//Linear Model on z-direction
Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
Double_t slope = fitter->GetParameter(2);
Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
treeStreamer << "FitTiltedRiemanConstraint"
<< "EventNumber=" << eventNumber
<< "CandidateNumber=" << candidateNumber
fitter->StoreData(kTRUE);
fitter->ClearPoints();
AliTRDLeastSquare zfitter;
- AliTRDcluster *cl = 0x0;
+ AliTRDcluster *cl = NULL;
Double_t xref = CalculateReferenceX(tracklets);
- Double_t x, y, z, t, tilt, dx, w, we;
- Double_t uvt[4];
+ Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
+ Double_t uvt[4], sumPolY[5], sumPolZ[3];
+ memset(sumPolY, 0, sizeof(Double_t) * 5);
+ memset(sumPolZ, 0, sizeof(Double_t) * 3);
Int_t nPoints = 0;
// Containers for Least-square fitter
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
tilt = tracklets[ipl].GetTilt();
for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
+ if(!cl->IsInChamber()) continue;
if (!tracklets[ipl].IsUsable(itb)) continue;
x = cl->GetX();
y = cl->GetY();
w = 2. * (y + tilt*z) * t;
// error definition changes for the different calls
we = 2. * t;
- we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
+ we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
fitter->AddPoint(uvt, w, we);
zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ // adding points for covariance matrix estimation
+ erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
+ erry *= erry;
+ errz = 1./cl->GetSigmaZ2();
+ for(Int_t ipol = 0; ipol < 5; ipol++){
+ sumPolY[ipol] += erry;
+ erry *= x;
+ if(ipol < 3){
+ sumPolZ[ipol] += errz;
+ errz *= x;
+ }
+ }
nPoints++;
}
}
Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
+ // Prepare error calculation
+ TMatrixD covarPolY(3,3);
+ covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
+ covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
+ covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
+ covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
+ covarPolY.Invert();
+ TMatrixD covarPolZ(2,2);
+ covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
+ covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
+ covarPolZ.Invert();
+
// Update the tracklets
- Double_t dy, dz;
+ Double_t x1, dy, dz;
+ Double_t cov[15];
+ memset(cov, 0, sizeof(Double_t) * 15);
for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
x = tracklets[iLayer].GetX0();
+ x1 = x - xref;
y = 0;
z = 0;
dy = 0;
dz = 0;
-
+ memset(cov, 0, sizeof(Double_t) * 3);
+ TMatrixD transform(3,3);
+ transform(0,0) = 1;
+ transform(0,1) = x;
+ transform(0,2) = x*x;
+ transform(1,1) = 1;
+ transform(1,2) = x;
+ transform(2,2) = 1;
+ TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
+ covariance *= transform.T();
+ TMatrixD transformZ(2,2);
+ transformZ(0,0) = transformZ(1,1) = 1;
+ transformZ(0,1) = x;
+ TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
+ covarZ *= transformZ.T();
// y: R^2 = (x - x0)^2 + (y - y0)^2
// => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
// R = Sqrt() = 1/Curvature
res = TMath::Sqrt(res);
y = (1.0 - res) / a;
}
+ cov[0] = covariance(0,0);
+ cov[2] = covarZ(0,0);
+ cov[1] = 0.;
// dy: R^2 = (x - x0)^2 + (y - y0)^2
// => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
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(0, z);
tracklets[iLayer].SetZref(1, dz);
tracklets[iLayer].SetC(curvature);
+ tracklets[iLayer].SetCovRef(cov);
tracklets[iLayer].SetChi2(chi2track);
}
-/* if(fReconstructor->GetStreamLevel() >=5){
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
//____________________________________________________________________
Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
{
+ //
+ // Fit track with a staight line
+ // Fills an AliTrackPoint array with np points
+ // Function should be used to refit tracks when no magnetic field was on
+ //
AliTRDLeastSquare yfitter, zfitter;
- AliTRDcluster *cl = 0x0;
+ AliTRDcluster *cl = NULL;
- AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
+ AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
if(!tracklets){
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
if(!(tracklet = track->GetTracklet(ipl))) continue;
//_________________________________________________________________________
Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
{
- //
- // 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
+//
+// Paramters: - Array of tracklets (connected to the track candidate)
+// - Flag selecting the error definition
+// Output: - Chi2 values of the track (in Parameter list)
+//
+// The equations which has to be solved simultaneously are:
+// BEGIN_LATEX
+// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
+// y^{*} = y - tg(h)(z - z_{t})
+// z_{t} = z_{0}+dzdx*(x-x_{r})
+// END_LATEX
+// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
+// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
+// track in the x-z plane. Using the following transformations
+// BEGIN_LATEX
+// t = 1 / (x^{2} + y^{2})
+// u = 2 * x * t
+// v = 2 * tan(h) * t
+// w = 2 * tan(h) * (x - x_{r}) * t
+// END_LATEX
+// One gets the following linear equation
+// BEGIN_LATEX
+// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
+// END_LATEX
+// where the coefficients have the following meaning
+// BEGIN_LATEX
+// a = -1/y_{0}
+// b = x_{0}/y_{0}
+// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
+// d = z_{0}
+// e = dz/dx
+// END_LATEX
+// The error calculation for the free term is thus
+// BEGIN_LATEX
+// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
+// END_LATEX
+//
+// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
+// to the formula:
+// BEGIN_LATEX
+// C = 1/R = a/(1 + b^{2} + c*a)
+// END_LATEX
+//
+// Authors
+// M.Ivanov <M.Ivanov@gsi.de>
+// A.Bercuci <A.Bercuci@gsi.de>
+// M.Fasel <M.Fasel@gsi.de>
+
TLinearFitter *fitter = GetTiltedRiemanFitter();
fitter->StoreData(kTRUE);
fitter->ClearPoints();
AliTRDLeastSquare zfitter;
- AliTRDcluster *cl = 0x0;
+ AliTRDcluster *cl = NULL;
- AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
+ AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
if(!tracklets){
for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
if(!(tracklet = track->GetTracklet(ipl))) continue;
Double_t x0 = -b * y0;
Double_t tmp = y0*y0 + x0*x0 - c*y0;
if(tmp<=0.) return 1.E10;
- Double_t R = TMath::Sqrt(tmp);
- Double_t C = 1.0 + b*b - c*a;
- if (C > 0.0) C = a / TMath::Sqrt(C);
+ Double_t radius = TMath::Sqrt(tmp);
+ Double_t curvature = 1.0 + b*b - c*a;
+ if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
// Calculate chi2 of the fit
Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
if(!track){
for(Int_t ip = 0; ip < kNPlanes; ip++) {
x = tracklets[ip].GetX0();
- tmp = R*R-(x-x0)*(x-x0);
+ tmp = radius*radius-(x-x0)*(x-x0);
if(tmp <= 0.) continue;
tmp = TMath::Sqrt(tmp);
tracklets[ip].SetYref(1, (x - x0) / tmp);
tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
tracklets[ip].SetZref(1, dzdx);
- tracklets[ip].SetC(C);
+ tracklets[ip].SetC(curvature);
tracklets[ip].SetChi2(chi2);
}
}
Float_t xyz[3];
for(int ip=0; ip<np; ip++){
points[ip].GetXYZ(xyz);
- xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
+ xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
xyz[2] = z0 + dzdx * (xyz[0] - xref);
points[ip].SetXYZ(xyz);
}
//____________________________________________________________________
-Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
+Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
{
// Kalman filter implementation for the TRD.
// It returns the positions of the fit in the array "points"
//if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
- AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
+ AliTRDseedV1 tracklet, *ptrTracklet = NULL;
//Loop through the TRD planes
for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
if(!(ptrTracklet = &tracklets[iplane])) continue;
}else{
if(!(ptrTracklet = track->GetTracklet(iplane))){
- /*AliTRDtrackerV1 *tracker = 0x0;
- if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
+ /*AliTRDtrackerV1 *tracker = NULL;
+ if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue;
ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
if(!tracker->MakeTracklet(ptrTracklet, track)) */
continue;
if (!AdjustSector(track)) break;
//Update track
- Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
- if(chi2<1e+10) track->Update(ptrTracklet, chi2);
+ Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
+ Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
+ if(chi2<1e+10) track->Update(p, cov, chi2);
if(!up) continue;
//Reset material budget if 2 consecutive gold
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
- }
+ if(t.GetProlongation(x,y,z)<0) 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());
branch->SetAddress(&clusterArray);
if(!fClusters){
- Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
- if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
+ Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters();
+ if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
array->SetOwner(kTRUE);
}
Int_t nEntries = (Int_t) clusterTree->GetEntries();
Int_t nbytes = 0;
Int_t ncl = 0;
- AliTRDcluster *c = 0x0;
+ AliTRDcluster *c = NULL;
for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
// Import the tree
nbytes += clusterTree->GetEvent(iEntry);
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);
delete (clusterArray->RemoveAt(iCluster));
}
// Fills clusters into TRD tracking sectors
//
- if(!fReconstructor->IsWritingClusters()){
+ if(!fkReconstructor->IsWritingClusters()){
fClusters = AliTRDReconstructor::GetClusters();
} else {
if (ReadClusters(fClusters, cTree)) {
}
//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
+Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
{
//
// Fills clusters into TRD tracking sectors
while (icl--) {
AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
if(c->IsInChamber()) nin++;
+ if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
Int_t detector = c->GetDetector();
Int_t sector = fGeom->GetSector(detector);
Int_t stack = fGeom->GetStack(detector);
const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
if(!fTrSec[isector].GetNChambers()) continue;
- fTrSec[isector].Init(fReconstructor, cal);
+ fTrSec[isector].Init(fkReconstructor, cal);
}
return nin;
//____________________________________________________________________
void AliTRDtrackerV1::UnloadClusters()
{
- //
- // Clears the arrays of clusters and tracks. Resets sectors and timebins
- //
-
- if(fTracks) fTracks->Delete();
- if(fTracklets) fTracklets->Delete();
+//
+// Clears the arrays of clusters and tracks. Resets sectors and timebins
+// If option "force" is also set the containers are also deleted. This is useful
+// in case of HLT
+
+ if(fTracks){
+ fTracks->Delete();
+ if(HasRemoveContainers()){delete fTracks; fTracks = NULL;}
+ }
+ if(fTracklets){
+ fTracklets->Delete();
+ if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
+ }
if(fClusters){
if(IsClustersOwner()) fClusters->Delete();
// save clusters array in the reconstructor for further use.
- if(!fReconstructor->IsWritingClusters()){
+ if(!fkReconstructor->IsWritingClusters()){
AliTRDReconstructor::SetClusters(fClusters);
SetClustersOwner(kFALSE);
- } else AliTRDReconstructor::SetClusters(0x0);
+ } else AliTRDReconstructor::SetClusters(NULL);
}
for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
// if(!track) return;
//
-// AliTRDseedV1 *tracklet = 0x0;
+// AliTRDseedV1 *tracklet = NULL;
// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
// if(!(tracklet = track->GetTracklet(ily))) continue;
-// AliTRDcluster *c = 0x0;
+// AliTRDcluster *c = NULL;
// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
// if(!(c=tracklet->GetClusters(ic))) continue;
// c->Use();
//
//_____________________________________________________________________________
-Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
+Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track)
{
//
// Rotates the track when necessary
//____________________________________________________________________
-AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
+AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx)
{
// Find tracklet for TRD track <track>
// Parameters
// Detailed description
//
idx = track->GetTrackletIndex(p);
- AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
+ AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
return tracklet;
}
//____________________________________________________________________
-AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
+AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet)
{
// Add this tracklet to the list of tracklets stored in the tracker
//
}
//____________________________________________________________________
-AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
+void AliTRDtrackerV1::CookNTimeBins()
+{
+ // Initialize number of time bins
+
+ if(fgNTimeBins){
+ // first look if set by hand
+ AliDebug(2, Form("NTimeBins [%d] (set by user)", fgNTimeBins));
+ } else if(fkReconstructor && fkReconstructor->HasDigitsParam()) {
+ // second look into digits param to avoid DB query
+ fgNTimeBins = fkReconstructor->GetDigitsParam()->GetNTimeBins();
+ AliDebug(2, Form("NTimeBins [%d] (set from digits param)", fgNTimeBins));
+ } else { // third query DB
+ AliTRDcalibDB *trd(NULL);
+ if((trd = AliTRDcalibDB::Instance())) {
+ if((fgNTimeBins = trd->GetNumberOfTimeBinsDCS()) <= 0){
+ AliError("Corrupted DCS Object in OCDB");
+ fgNTimeBins = 24;
+ AliDebug(2, Form("NTimeBins [%d] (set to default)", fgNTimeBins));
+ } else AliDebug(2, Form("NTimeBins [%d] (set from DB)", fgNTimeBins));
+ } else AliFatal("Could not get DB.");
+ }
+ if(fgNTimeBins<=0){
+ AliFatal("Could not get number of time bins.");
+ }
+}
+
+//____________________________________________________________________
+AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track)
{
// Add this track to the list of tracks stored in the tracker
//
Int_t nTracks = 0;
Int_t nChambers = 0;
- AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
+ AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
if(!(stack = fTrSec[sector].GetStack(istack))) continue;
nChambers = 0;
for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
if(!(chamber = stack[ilayer])) continue;
- if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
+ if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
nChambers++;
//AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
}
}
//____________________________________________________________________
-Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
+Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList)
{
//
// Make tracks in one TRD stack.
//
const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDtrackingChamber **ci = 0x0;
+ AliTRDtrackingChamber *chamber = NULL;
+ AliTRDtrackingChamber **ci = NULL;
AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
Int_t pars[4]; // MakeSeeds parameters
// Build initial seeding configurations
Double_t quality = BuildSeedingConfigs(stack, configs);
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
AliInfo(Form("Plane config %d %d %d Quality %f"
, configs[0], configs[1], configs[2], quality));
}
pars[1] = ntracks;
pars[2] = istack;
ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
+ //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
if(ntracks == kMaxTracksStack) break;
}
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
+ AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
if(!ntracks) break;
// Sieve clusters in decreasing order of track quality
Double_t trackParams[7];
- // AliTRDseedV1 *lseed = 0x0;
+ // AliTRDseedV1 *lseed = NULL;
Int_t jSieve = 0, candidates;
do{
//AliInfo(Form("\t\tITER = %i ", jSieve));
Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
//AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
AliTRDseedV1 *dseed[6];
for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
//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 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
cstreamer << "Clusters2TracksStack"
<< "EventNumber=" << eventNumber
<< "TrackNumber=" << trackNumber
AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
if(!track){
- AliWarning("Fail to build a TRD Track.");
+ AliDebug(1, "Track building failed.");
continue;
}
esdTrack->SetLabel(track->GetLabel());
track->UpdateESDtrack(esdTrack);
// write ESD-friends if neccessary
- if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
+ if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){
AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
calibTrack->SetOwner();
esdTrack->AddCalibObject(calibTrack);
// increment counters
ntracks2 += ntracks1;
- if(fReconstructor->IsHLT()) break;
+ if(fkReconstructor->IsHLT()) break;
fSieveSeeding++;
// Rebuild plane configurations and indices taking only unused clusters into account
quality = BuildSeedingConfigs(stack, configs);
- if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
+ if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
for(Int_t ip = 0; ip < kNPlanes; ip++){
if(!(chamber = stack[ip])) continue;
chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
}
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){
AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
}
} while(fSieveSeeding<10); // end stack clusters sieve
//
Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
- AliTRDtrackingChamber *chamber = 0x0;
+ AliTRDtrackingChamber *chamber = NULL;
for(int iplane=0; iplane<kNPlanes; iplane++){
if(!(chamber = stack[iplane])) continue;
chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
}
//____________________________________________________________________
-Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
+Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const 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.
- //
-
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
+//
+// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
+// either missed by TPC prolongation or conversions inside the TRD volume.
+// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
+//
+// 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.
+//
+// The following steps are performed:
+// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
+// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
+// is described in AliTRDtrackerV1::Clusters2TracksStack().
+// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
+// - for each seeding cluster in the lower seeding layer find
+// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
+// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
+// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
+// reco params
+// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
+// seeding clusters.
+// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
+// and AliTRDchamberTimeBin::GetClusters().
+// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
+// performed at this level
+// 4. Initialize seeding tracklets in the seeding chambers.
+// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
+// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
+// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
+// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
+// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
+// approximation of the track.
+// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
+// checked against the Riemann fit:
+// - position resolution in y
+// - angular resolution in the bending plane
+// - likelihood of the number of clusters attached to the tracklet
+// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
+// - Initialization of extrapolation tracklets with the fit parameters
+// - Attach clusters to extrapolated tracklets
+// - Helix fit of tracklets
+// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
+// 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.
+//
+// Authors:
+// Marian Ivanov <M.Ivanov@gsi.de>
+// Alexandru Bercuci <A.Bercuci@gsi.de>
+// Markus Fasel <M.Fasel@gsi.de>
+
+ AliTRDtrackingChamber *chamber = NULL;
+ AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters
AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
Int_t ncl, mcl; // working variable for looping over clusters
Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
// chi2[1] = tracklet chi2 on the R direction
Double_t chi2[4];
- // this should be data member of AliTRDtrack
+ // this should be data member of AliTRDtrack TODO
Double_t seedQuality[kMaxTracksStack];
// unpack control parameters
Int_t ntracks = ipar[1];
Int_t istack = ipar[2];
Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
- Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
+ Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
// Init chambers geometry
Double_t hL[kNPlanes]; // Tilting angle
Float_t padlength[kNPlanes]; // pad lenghts
Float_t padwidth[kNPlanes]; // pad widths
- AliTRDpadPlane *pp = 0x0;
+ AliTRDpadPlane *pp = NULL;
for(int iplane=0; iplane<kNPlanes; iplane++){
pp = fGeom->GetPadPlane(iplane, istack);
hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
}
// Init anode wire position for chambers
- Double_t x0[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2}, // anode wire position
+ Double_t x0[kNPlanes], // anode wire position
driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
- TGeoHMatrix *matrix = 0x0;
+ TGeoHMatrix *matrix = NULL;
Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
Double_t glb[] = {0., 0., 0.};
AliTRDtrackingChamber **cIter = &stack[0];
- for(int iLayer=kNPlanes; iLayer--; cIter++){
+ for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
if(!(*cIter)) continue;
- if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))) continue;
+ if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
+ continue;
+ x0[iLayer] = fgkX0[iLayer];
+ }
matrix->LocalToMaster(loc, glb);
x0[iLayer] = glb[0];
}
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
- AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
- }
+ AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
// Build seeding layers
ResetSeedTB();
Int_t nlayers = 0;
for(int isl=0; isl<kNSeedPlanes; isl++){
if(!(chamber = stack[planes[isl]])) continue;
- if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
+ if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue;
nlayers++;
}
if(nlayers < kNSeedPlanes) return ntracks;
c[0] = (*fSeedTB[0])[index[jcl++]];
if(!c[0]) continue;
Double_t dx = c[3]->GetX() - c[0]->GetX();
- Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
- Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
- fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
+ Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
+ Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
+ fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
fSeedTB[1]->GetClusters(cond1, jndex, mcl);
//printf("Found c[0] candidates 1 %d\n", mcl);
while(kcl<mcl) {
c[1] = (*fSeedTB[1])[jndex[kcl++]];
if(!c[1]) continue;
- fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
+ fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
c[2] = fSeedTB[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());
+
+ AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].",
+ c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
+ c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
+ c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
+ c[3]->GetX(), c[3]->GetY(), c[3]->GetZ()));
for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
FitRieman(c, chi2);
AliTRDseedV1 *tseed = &cseed[0];
- AliTRDtrackingChamber **cIter1 = &stack[0];
- for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter1++){
- Int_t det = (*cIter1) ? (*cIter1)->GetDetector() : -1;
+ cIter = &stack[0];
+ for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
+ Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
tseed->SetDetector(det);
tseed->SetTilt(hL[iLayer]);
tseed->SetPadLength(padlength[iLayer]);
tseed->SetPadWidth(padwidth[iLayer]);
- tseed->SetReconstructor(fReconstructor);
+ tseed->SetReconstructor(fkReconstructor);
tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
tseed->Init(GetRiemanFitter());
tseed->SetStandAlone(kTRUE);
}
Bool_t isFake = kFALSE;
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
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;
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
AliRieman *rim = GetRiemanFitter();
- TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
cs0 << "MakeSeeds0"
<<"EventNumber=" << eventNumber
<<"CandidateNumber=" << candidateNumber
<<"RiemanFitter.=" << rim
<<"\n";
}
- if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
-// //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
+ if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
+ AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
continue;
}
- if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
-// //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
+ if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
+ AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1]));
AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
continue;
}
//AliInfo("Passed chi2 filter.");
// try attaching clusters to tracklets
- Int_t mlayers = 0;
+ Int_t mlayers = 0;
+ AliTRDcluster *cl = NULL;
for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
Int_t jLayer = planes[iLayer];
+ Int_t nNotInChamber = 0;
if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
- cseed[jLayer].UpdateUsed();
- if(!cseed[jLayer].IsOK()) continue;
+ if(/*fkReconstructor->IsHLT()*/kFALSE){
+ cseed[jLayer].UpdateUsed();
+ if(!cseed[jLayer].IsOK()) continue;
+ }else{
+ cseed[jLayer].Fit();
+ cseed[jLayer].UpdateUsed();
+ cseed[jLayer].ResetClusterIter();
+ while((cl = cseed[jLayer].NextCluster())){
+ if(!cl->IsInChamber()) nNotInChamber++;
+ }
+ //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
+ if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data
+ }
mlayers++;
}
if(mlayers < kNSeedPlanes){
- //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
+ AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
continue;
}
// temporary exit door for the HLT
- if(fReconstructor->IsHLT()){
+ if(fkReconstructor->IsHLT()){
// attach clusters to extrapolation chambers
for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
Int_t jLayer = planesExt[iLayer];
if(!(chamber = stack[jLayer])) continue;
- cseed[jLayer].AttachClusters(chamber, kTRUE);
+ if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
+ cseed[jLayer].Fit();
}
fTrackQuality[ntracks] = 1.; // dummy value
ntracks++;
}
Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
- if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
- //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
+ if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){
+ AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
continue;
}
fSeedLayer[ntracks] = config;/*sLayer;*/
// attach clusters to the extrapolation seeds
+ Int_t elayers(0);
for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
Int_t jLayer = planesExt[iLayer];
if(!(chamber = stack[jLayer])) continue;
cseed[jLayer] = pseed;
FitTiltedRieman(cseed, kTRUE);
cseed[jLayer].Fit(kTRUE);
+ elayers++;
}
// AliInfo("Extrapolation done.");
// Debug Stream containing all the 6 tracklets
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
<< "\n";
}
- if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
+ if(fkReconstructor->GetRecoParam()->HasImproveTracklets()){
+ AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer] = cseed[jLayer];
+
+ if(ImproveSeedQuality(stack, cseed) < mlayers+elayers){
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ AliDebug(3, "Filter on improve seeds.");
+ } else {
+ // store results
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer] = bseed[jLayer];
+ }
}
//AliInfo("Improve seed quality done.");
// do the final track fitting (Once with vertex constraint and once without vertex constraint)
Double_t chi2Vals[3];
- chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
- if(fReconstructor->GetRecoParam()->IsVertexConstrained())
+ chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
+ if(fkReconstructor->GetRecoParam()->IsVertexConstrained())
chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
else
chi2Vals[1] = 1.;
fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
//AliInfo("Hyperplane fit done\n");
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
}
//_____________________________________________________________________________
-AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
+AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const 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 !!
- //
-
+//
+// Build a TRD track out of tracklet candidates
+//
+// Parameters :
+// seeds : array of tracklets
+// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
+// [0] - radial position of the track at reference point
+// [1] - y position of the fit at [0]
+// [2] - z position of the fit at [0]
+// [3] - snp of the first tracklet
+// [4] - tgl of the first tracklet
+// [5] - curvature of the Riemann fit - 1/pt
+// [6] - sector rotation angle
+//
+// Output :
+// The TRD track.
+//
+// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
+// (diagonal with constant variance terms TODO - correct parameterization)
+//
+// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
+// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
+// for details). Do also MC label calculation and PID if propagation successfully.
+
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;
+ c[ 0] = 0.2; // s^2_y
+ c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
+ c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
+ c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
+ c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt
AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
track.PropagateTo(params[0]-5.0);
- AliTRDseedV1 *ptrTracklet = 0x0;
- // Sign clusters
- for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
- ptrTracklet = &seeds[jLayer];
- if(!ptrTracklet->IsOK()) continue;
- if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
- }
- //
- if(fReconstructor->IsHLT()){
- for(Int_t ip=0; ip<kNPlanes; ip++){
- track.UnsetTracklet(ip);
- ptrTracklet = SetTracklet(&seeds[ip]);
+ AliTRDseedV1 *ptrTracklet = NULL;
+
+ // skip Kalman filter for HLT
+ if(/*fkReconstructor->IsHLT()*/kFALSE){
+ for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
+ track.UnsetTracklet(jLayer);
+ ptrTracklet = &seeds[jLayer];
+ if(!ptrTracklet->IsOK()) continue;
+ if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
+ ptrTracklet = SetTracklet(ptrTracklet);
ptrTracklet->UseClusters();
track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
}
AliTRDtrackV1 *ptrTrack = SetTrack(&track);
- ptrTrack->SetReconstructor(fReconstructor);
+ ptrTrack->CookPID();
+ ptrTrack->CookLabel(.9);
+ ptrTrack->SetReconstructor(fkReconstructor);
return ptrTrack;
}
+ if(TMath::Abs(track.GetY())>1000)
+ return NULL;
+
track.ResetCovariance(1);
Int_t nc = TMath::Abs(FollowBackProlongation(track));
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
Double_t p[5]; // Track Params for the Debug Stream
track.GetExternalParameters(params[0], p);
- TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
cs << "MakeTrack"
<< "EventNumber=" << eventNumber
<< "CandidateNumber=" << candidateNumber
<< "track.=" << &track
<< "\n";
}
- if (nc < 30) return 0x0;
+ if (nc < 30) return NULL;
AliTRDtrackV1 *ptrTrack = SetTrack(&track);
- ptrTrack->SetReconstructor(fReconstructor);
+ ptrTrack->SetReconstructor(fkReconstructor);
ptrTrack->CookLabel(.9);
// computes PID for track
//
// make a local working copy
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDseedV1 bseed[6];
- Int_t nLayers = 0;
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
-
- Float_t lastquality = 10000.0;
- Float_t lastchi2 = 10000.0;
- Float_t chi2 = 1000.0;
+ AliTRDtrackingChamber *chamber = NULL;
+ AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
+
+ Float_t quality(0.),
+ lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
+ Int_t rLayers(0);
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
+ bseed[jLayer] = cseed[jLayer];
+ if(!bseed[jLayer].IsOK()) continue;
+ rLayers++;
+ lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
+ quality += lQuality[jLayer];
+ }
+ Float_t chi2 = FitTiltedRieman(bseed, kTRUE);
for (Int_t iter = 0; iter < 4; iter++) {
- Float_t sumquality = 0.0;
- Float_t squality[6];
- Int_t sortindexes[6];
-
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
- squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
- sumquality += squality[jLayer];
- }
- if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
-
- nLayers = 0;
- lastquality = sumquality;
- lastchi2 = chi2;
- if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
-
- TMath::Sort(6, squality, sortindexes, kFALSE);
- for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
- Int_t bLayer = sortindexes[jLayer];
+ AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
+
+ // Try better cluster set
+ Int_t nLayers(0); Float_t qualitynew(0.);
+ Int_t indexes[6];
+ TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
+ Int_t bLayer = indexes[jLayer];
+ bseed[bLayer].Reset("c");
if(!(chamber = stack[bLayer])) continue;
- bseed[bLayer].AttachClusters(chamber, kTRUE);
+ if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
bseed[bLayer].Fit(kTRUE);
- if(bseed[bLayer].IsOK()) nLayers++;
+ if(!bseed[bLayer].IsOK()) continue;
+ nLayers++;
+ lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
+ qualitynew += lQuality[jLayer];
}
+ if(rLayers > nLayers){
+ AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
+ break;
+ } else rLayers=nLayers;
+
+ if(qualitynew >= quality){
+ AliDebug(4, Form("Quality worsen in iter[%d].", iter));
+ break;
+ } else quality = qualitynew;
+
+ // try improve track parameters
+ AliTRDseedV1 tseed[AliTRDgeometry::kNlayer];
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) tseed[jLayer]=bseed[jLayer];
+ Float_t chi2new = FitTiltedRieman(tseed, kTRUE);
+ if(chi2new > chi2){
+ AliDebug(4, Form("Chi2 worsen in iter[%d].", iter));
+ break;
+ } else chi2 = chi2new;
- chi2 = FitTiltedRieman(bseed, kTRUE);
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
+ // store better tracklets
+ for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer]=tseed[jLayer];
+
+
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
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
// we are sure that at least 2 tracklets are OK !
- return nLayers+2;
+ return rLayers;
}
//_________________________________________________________________________
-Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
+Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){
//
// Calculates the Track Likelihood value. This parameter serves as main quality criterion for
// the track selection
chi2phi /= Float_t (nLayers - 2.0);
Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
- Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
+ Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ?
TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
- Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
- Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);
+ Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
+ Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
cstreamer << "CalculateTrackLikelihood0"
<< "EventNumber=" << eventNumber
<< "CandidateNumber=" << candidateNumber
<< "TrackLikelihood=" << trackLikelihood
<< "\n";
}
-
+
return trackLikelihood;
}
//
// ratio of the total number of clusters/track which are expected to be found by the tracker.
- const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
+ const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam();
Double_t chi2y = GetChi2Y(&cseed[0]);
Double_t chi2z = GetChi2Z(&cseed[0]);
Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
Double_t likechi2y = 0.0000000001;
- if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
+ if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
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));
- if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){
Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- Int_t nTracklets = 0; Float_t mean_ncls = 0;
+ Int_t nTracklets = 0; Float_t meanNcls = 0;
for(Int_t iseed=0; iseed < kNPlanes; iseed++){
if(!cseed[iseed].IsOK()) continue;
nTracklets++;
- mean_ncls += cseed[iseed].GetN2();
+ meanNcls += cseed[iseed].GetN2();
}
- if(nTracklets) mean_ncls /= nTracklets;
+ if(nTracklets) meanNcls /= nTracklets;
// The Debug Stream contains the seed
- TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
cstreamer << "CookLikelihood"
<< "EventNumber=" << eventNumber
<< "CandidateNumber=" << candidateNumber
<< "nclusters=" << nclusters
<< "likeN=" << likeN
<< "like=" << like
- << "meanncls=" << mean_ncls
+ << "meanncls=" << meanNcls
<< "\n";
}
AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
{
Int_t ncls = fClusters->GetEntriesFast();
- return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
+ return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL;
}
//____________________________________________________________________
AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
{
Int_t ntrklt = fTracklets->GetEntriesFast();
- return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
+ return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL;
}
//____________________________________________________________________
AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
{
Int_t ntrk = fTracks->GetEntriesFast();
- return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
+ return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL;
}
-//____________________________________________________________________
-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)
- //
- Int_t nDistances = 0;
- Float_t meanDistance = 0.;
- Int_t startIndex = 5;
- for(Int_t il =5; il > 0; il--){
- if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
- Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
- meanDistance += xdiff;
- nDistances++;
- }
- if(tracklets[il].IsOK()) startIndex = il;
- }
- if(tracklets[0].IsOK()) startIndex = 0;
- if(!nDistances){
- // We should normally never get here
- Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
- Int_t iok = 0, idiff = 0;
- // This attempt is worse and should be avoided:
- // check for two chambers which are OK and repeat this without taking the mean value
- // 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;
- }
- if(iok) idiff++; // to get the right difference;
- if(iok > 1) break;
- }
- if(iok > 1){
- meanDistance = (xpos[0] - xpos[1])/idiff;
- }
- else{
- // we have do not even have 2 layers which are OK? The we do not need to fit at all
- return 331.;
- }
- }
- else{
- meanDistance /= nDistances;
- }
- return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
-}
+
// //_____________________________________________________________________________
// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
//_____________________________________________________________________________
-Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
+Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const
{
// Calculates normalized chi2 in y-direction
// chi2 = Sum chi2 / n_tracklets
}
//_____________________________________________________________________________
-Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
+Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const
{
// Calculates normalized chi2 in z-direction
// chi2 = Sum chi2 / n_tracklets
return n ? chi2/n : 0.;
}
+//____________________________________________________________________
+Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const 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)
+ // Only kept for compatibility with the old code
+ //
+ Int_t nDistances = 0;
+ Float_t meanDistance = 0.;
+ Int_t startIndex = 5;
+ for(Int_t il =5; il > 0; il--){
+ if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
+ Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
+ meanDistance += xdiff;
+ nDistances++;
+ }
+ if(tracklets[il].IsOK()) startIndex = il;
+ }
+ if(tracklets[0].IsOK()) startIndex = 0;
+ if(!nDistances){
+ // We should normally never get here
+ Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
+ Int_t iok = 0, idiff = 0;
+ // This attempt is worse and should be avoided:
+ // check for two chambers which are OK and repeat this without taking the mean value
+ // 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;
+ }
+ if(iok) idiff++; // to get the right difference;
+ if(iok > 1) break;
+ }
+ if(iok > 1){
+ meanDistance = (xpos[0] - xpos[1])/idiff;
+ }
+ else{
+ // we have do not even have 2 layers which are OK? The we do not need to fit at all
+ return 331.;
+ }
+ }
+ else{
+ meanDistance /= nDistances;
+ }
+ return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){
+ //
+ // Track Fitter Function using the new class implementation of
+ // the Rieman fit
+ //
+ AliTRDtrackFitterRieman fitter;
+ fitter.SetRiemanFitter(GetTiltedRiemanFitter());
+ fitter.Reset();
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]);
+ Double_t chi2 = fitter.Eval();
+ // Update the tracklets
+ Double_t cov[15]; Double_t x0;
+ memset(cov, 0, sizeof(Double_t) * 15);
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){
+ x0 = tracklets[il].GetX0();
+ tracklets[il].SetYref(0, fitter.GetYat(x0));
+ tracklets[il].SetZref(0, fitter.GetZat(x0));
+ tracklets[il].SetYref(1, fitter.GetDyDxAt(x0));
+ tracklets[il].SetZref(1, fitter.GetDzDx());
+ tracklets[il].SetC(fitter.GetCurvature());
+ fitter.GetCovAt(x0, cov);
+ tracklets[il].SetCovRef(cov);
+ tracklets[il].SetChi2(chi2);
+ }
+ return chi2;
+}
+
///////////////////////////////////////////////////////
// //
// Resources of class AliTRDLeastSquare //
//_____________________________________________________________________________
AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
- //
- // Constructor of the nested class AliTRDtrackFitterLeastSquare
- //
+//
+// Constructor of the nested class AliTRDtrackFitterLeastSquare
+//
+// Fast solving linear regresion in 2D
+// y=a + bx
+// The data members have the following meaning
+// fParams[0] : a
+// fParams[1] : b
+//
+// fSums[0] : S
+// fSums[1] : Sx
+// fSums[2] : Sy
+// fSums[3] : Sxy
+// fSums[4] : Sxx
+// fSums[5] : Syy
+//
+// fCovarianceMatrix[0] : s2a
+// fCovarianceMatrix[1] : s2b
+// fCovarianceMatrix[2] : cov(ab)
+
memset(fParams, 0, sizeof(Double_t) * 2);
- memset(fSums, 0, sizeof(Double_t) * 5);
+ memset(fSums, 0, sizeof(Double_t) * 6);
memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
}
//_____________________________________________________________________________
-void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
+void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){
//
// Adding Point to the fitter
//
- Double_t weight = 1/(sigmaY * sigmaY);
- Double_t &xpt = *x;
+
+ Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
+ weight *= weight;
+ const Double_t &xpt = *x;
// printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
fSums[0] += weight;
fSums[1] += weight * xpt;
}
//_____________________________________________________________________________
-void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
+void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){
//
// Remove Point from the sample
//
- Double_t weight = 1/(sigmaY * sigmaY);
- Double_t &xpt = *x;
+
+ Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
+ weight *= weight;
+ const Double_t &xpt = *x;
fSums[0] -= weight;
fSums[1] -= weight * xpt;
fSums[2] -= weight * y;
}
//_____________________________________________________________________________
-void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
+Bool_t 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];
- if(denominator==0) return;
+ Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1];
+ if(det==0) return kFALSE;
// 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;
+ fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det;
+ fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det;
// 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 den = fSums[0]*fSums[4] - fSums[1]*fSums[1];
+ fCovarianceMatrix[0] = fSums[4] / den;
+ fCovarianceMatrix[1] = fSums[0] / den;
+ fCovarianceMatrix[2] = -fSums[1] / den;
+/* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]);
+ fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]);
+ fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/
+
+
+
+ return kTRUE;
}
//_____________________________________________________________________________
-Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
+Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const {
//
// Returns the Function value of the fitted function at a given x-position
//
memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
}
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){
+ //
+ // Reset the fitter
+ //
+ memset(fParams, 0, sizeof(Double_t) * 2);
+ memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
+ memset(fSums, 0, sizeof(Double_t) * 6);
+}
+
+///////////////////////////////////////////////////////
+// //
+// Resources of class AliTRDtrackFitterRieman //
+// //
+///////////////////////////////////////////////////////
+
+//_____________________________________________________________________________
+AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman():
+ fTrackFitter(NULL),
+ fZfitter(NULL),
+ fCovarPolY(NULL),
+ fCovarPolZ(NULL),
+ fXref(0.),
+ fSysClusterError(0.)
+{
+ //
+ // Default constructor
+ //
+ fZfitter = new AliTRDLeastSquare;
+ fCovarPolY = new TMatrixD(3,3);
+ fCovarPolZ = new TMatrixD(2,2);
+ memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6);
+ memset(fParameters, 0, sizeof(Double_t) * 5);
+ memset(fSumPolY, 0, sizeof(Double_t) * 5);
+ memset(fSumPolZ, 0, sizeof(Double_t) * 2);
+}
+
+//_____________________________________________________________________________
+AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){
+ //
+ // Destructor
+ //
+ if(fZfitter) delete fZfitter;
+ if(fCovarPolY) delete fCovarPolY;
+ if(fCovarPolZ) delete fCovarPolZ;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){
+ //
+ // Reset the Fitter
+ //
+ if(fTrackFitter){
+ fTrackFitter->StoreData(kTRUE);
+ fTrackFitter->ClearPoints();
+ }
+ if(fZfitter){
+ fZfitter->Reset();
+ }
+ fXref = 0.;
+ memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer);
+ memset(fParameters, 0, sizeof(Double_t) * 5);
+ memset(fSumPolY, 0, sizeof(Double_t) * 5);
+ memset(fSumPolZ, 0, sizeof(Double_t) * 2);
+ for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++)
+ for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){
+ (*fCovarPolY)(irow, icol) = 0.;
+ if(irow < 2 && icol < 2)
+ (*fCovarPolZ)(irow, icol) = 0.;
+ }
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){
+ //
+ // Add tracklet into the fitter
+ //
+ if(itr >= AliTRDgeometry::kNlayer) return;
+ fTracklets[itr] = tracklet;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){
+ //
+ // Perform the fit
+ // 1. Apply linear transformation and store points in the fitter
+ // 2. Evaluate the fit
+ // 3. Check if the result of the fit in z-direction is reasonable
+ // if not
+ // 3a. Fix the parameters 3 and 4 with the results of a simple least
+ // square fit
+ // 3b. Redo the fit with the fixed parameters
+ // 4. Store fit results (parameters and errors)
+ //
+ if(!fTrackFitter){
+ return 1e10;
+ }
+ fXref = CalculateReferenceX();
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]);
+ if(!fTrackFitter->GetNpoints()) return 1e10;
+ // perform the fit
+ fTrackFitter->Eval();
+ fZfitter->Eval();
+ fParameters[3] = fTrackFitter->GetParameter(3);
+ fParameters[4] = fTrackFitter->GetParameter(4);
+ if(!CheckAcceptable(fParameters[3], fParameters[4])) {
+ fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref));
+ fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1));
+ fTrackFitter->Eval();
+ fTrackFitter->ReleaseParameter(3);
+ fTrackFitter->ReleaseParameter(4);
+ fParameters[3] = fTrackFitter->GetParameter(3);
+ fParameters[4] = fTrackFitter->GetParameter(4);
+ }
+ // Update the Fit Parameters and the errors
+ fParameters[0] = fTrackFitter->GetParameter(0);
+ fParameters[1] = fTrackFitter->GetParameter(1);
+ fParameters[2] = fTrackFitter->GetParameter(2);
+
+ // Prepare Covariance estimation
+ (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4];
+ (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1];
+ (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2];
+ (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3];
+ fCovarPolY->Invert();
+ (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2];
+ (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1];
+ fCovarPolZ->Invert();
+ return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints();
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(AliTRDseedV1 * const tracklet){
+ //
+ // Does the transformations and updates the fitters
+ // The following transformation is applied
+ //
+ AliTRDcluster *cl = NULL;
+ Double_t x, y, z, dx, t, w, we, yerr, zerr;
+ Double_t uvt[4];
+ if(!tracklet || !tracklet->IsOK()) return;
+ Double_t tilt = tracklet->GetTilt();
+ for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
+ if(!(cl = tracklet->GetClusters(itb))) continue;
+ if(!cl->IsInChamber()) continue;
+ if (!tracklet->IsUsable(itb)) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ dx = x - fXref;
+ // Transformation
+ t = 1./(x*x + y*y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = 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
+ we = 2. * t;
+ we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2());
+ // Update sums for error calculation
+ yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError);
+ yerr *= yerr;
+ zerr = 1./cl->GetSigmaZ2();
+ for(Int_t ipol = 0; ipol < 5; ipol++){
+ fSumPolY[ipol] += yerr;
+ yerr *= x;
+ if(ipol < 3){
+ fSumPolZ[ipol] += zerr;
+ zerr *= x;
+ }
+ }
+ fTrackFitter->AddPoint(uvt, w, we);
+ fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ }
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){
+ //
+ // Check whether z-results are acceptable
+ // Definition: Distance between tracklet fit and track fit has to be
+ // less then half a padlength
+ // Point of comparision is at the anode wire
+ //
+ Bool_t acceptablez = kTRUE;
+ Double_t zref = 0.0;
+ for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
+ if(!fTracklets[iLayer]->IsOK()) continue;
+ zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref);
+ if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0)
+ acceptablez = kFALSE;
+ }
+ return acceptablez;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const {
+ //
+ // Calculate y position out of the track parameters
+ // y: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
+ // R = Sqrt() = 1/Curvature
+ // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
+ //
+ Double_t y = 0;
+ Double_t disc = (x * fParameters[0] + fParameters[1]);
+ disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc;
+ if (disc >= 0) {
+ disc = TMath::Sqrt(disc);
+ y = (1.0 - disc) / fParameters[0];
+ }
+ return y;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const {
+ //
+ // Return z position for a given x position
+ // Simple linear function
+ //
+ return fParameters[3] + fParameters[4] * (x - fXref);
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const {
+ //
+ // Calculate dydx at a given radial position out of the track parameters
+ // dy: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
+ // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
+ // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
+ // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
+ //
+ Double_t x0 = -fParameters[1] / fParameters[0];
+ Double_t curvature = GetCurvature();
+ Double_t dy = 0;
+ if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 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 (fParameters[0] < 0) yderiv *= -1.0;
+ dy = yderiv;
+ }
+ }
+ return dy;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const {
+ //
+ // Calculate track curvature
+ //
+ //
+ Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0];
+ if (curvature > 0.0)
+ curvature = fParameters[0] / TMath::Sqrt(curvature);
+ return curvature;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const {
+ //
+ // Error Definition according to gauss error propagation
+ //
+ TMatrixD transform(3,3);
+ transform(0,0) = transform(1,1) = transform(2,2) = 1;
+ transform(0,1) = transform(1,2) = x;
+ transform(0,2) = x*x;
+ TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY);
+ covariance *= transform.T();
+ cov[0] = covariance(0,0);
+ TMatrixD transformZ(2,2);
+ transformZ(0,0) = transformZ(1,1) = 1;
+ transformZ(0,1) = x;
+ TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ);
+ covarZ *= transformZ.T();
+ cov[1] = covarZ(0,0);
+ cov[2] = 0;
+}
+
+//____________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){
+ //
+ // 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;
+ for(Int_t il =5; il > 0; il--){
+ if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){
+ Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0();
+ meanDistance += xdiff;
+ nDistances++;
+ }
+ if(fTracklets[il]->IsOK()) startIndex = il;
+ }
+ if(fTracklets[0]->IsOK()) startIndex = 0;
+ if(!nDistances){
+ // We should normally never get here
+ Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
+ Int_t iok = 0, idiff = 0;
+ // This attempt is worse and should be avoided:
+ // check for two chambers which are OK and repeat this without taking the mean value
+ // Strategy avoids a division by 0;
+ for(Int_t il = 5; il >= 0; il--){
+ if(fTracklets[il]->IsOK()){
+ xpos[iok] = fTracklets[il]->GetX0();
+ iok++;
+ startIndex = il;
+ }
+ if(iok) idiff++; // to get the right difference;
+ if(iok > 1) break;
+ }
+ if(iok > 1){
+ meanDistance = (xpos[0] - xpos[1])/idiff;
+ }
+ else{
+ // we have do not even have 2 layers which are OK? The we do not need to fit at all
+ return 331.;
+ }
+ }
+ else{
+ meanDistance /= nDistances;
+ }
+ return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff