1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
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11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 ////////////////////////////////////////////////////////////////////////////
20 // The TRD offline tracklet
22 // The running horse of the TRD reconstruction. The following tasks are preformed:
23 // 1. Clusters attachment to tracks based on prior information stored at tracklet level (see AttachClusters)
24 // 2. Clusters position recalculation based on track information (see GetClusterXY and Fit)
25 // 3. Cluster error parametrization recalculation (see Fit)
26 // 4. Linear track approximation (Fit)
27 // 5. Optimal position (including z estimate for pad row cross tracklets) and covariance matrix of the track fit inside one TRD chamber (Fit)
28 // 6. Tilt pad correction and systematic effects (GetCovAt)
29 // 7. dEdx calculation (CookdEdx)
30 // 8. PID probabilities estimation (CookPID)
33 // Alex Bercuci <A.Bercuci@gsi.de> //
34 // Markus Fasel <M.Fasel@gsi.de> //
36 ////////////////////////////////////////////////////////////////////////////
39 #include "TLinearFitter.h"
40 #include "TClonesArray.h" // tmp
41 #include <TTreeStream.h>
44 #include "AliMathBase.h"
45 #include "AliCDBManager.h"
46 #include "AliTracker.h"
48 #include "AliTRDpadPlane.h"
49 #include "AliTRDcluster.h"
50 #include "AliTRDseedV1.h"
51 #include "AliTRDtrackV1.h"
52 #include "AliTRDcalibDB.h"
53 #include "AliTRDchamberTimeBin.h"
54 #include "AliTRDtrackingChamber.h"
55 #include "AliTRDtrackerV1.h"
56 #include "AliTRDReconstructor.h"
57 #include "AliTRDrecoParam.h"
58 #include "AliTRDCommonParam.h"
60 #include "Cal/AliTRDCalPID.h"
61 #include "Cal/AliTRDCalROC.h"
62 #include "Cal/AliTRDCalDet.h"
64 ClassImp(AliTRDseedV1)
66 //____________________________________________________________________
67 AliTRDseedV1::AliTRDseedV1(Int_t det)
94 for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1;
95 memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
96 memset(fPad, 0, 3*sizeof(Float_t));
97 fYref[0] = 0.; fYref[1] = 0.;
98 fZref[0] = 0.; fZref[1] = 0.;
99 fYfit[0] = 0.; fYfit[1] = 0.;
100 fZfit[0] = 0.; fZfit[1] = 0.;
101 memset(fdEdx, 0, kNslices*sizeof(Float_t));
102 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
103 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
104 fLabels[2]=0; // number of different labels for tracklet
105 memset(fRefCov, 0, 7*sizeof(Double_t));
106 // covariance matrix [diagonal]
107 // default sy = 200um and sz = 2.3 cm
108 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
109 SetStandAlone(kFALSE);
112 //____________________________________________________________________
113 AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
114 :AliTRDtrackletBase((AliTRDtrackletBase&)ref)
138 // Copy Constructor performing a deep copy
143 SetBit(kOwner, kFALSE);
144 SetStandAlone(ref.IsStandAlone());
148 //____________________________________________________________________
149 AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
152 // Assignment Operator using the copy function
158 SetBit(kOwner, kFALSE);
163 //____________________________________________________________________
164 AliTRDseedV1::~AliTRDseedV1()
167 // Destructor. The RecoParam object belongs to the underlying tracker.
170 //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
173 for(int itb=0; itb<kNclusters; itb++){
174 if(!fClusters[itb]) continue;
175 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
176 delete fClusters[itb];
177 fClusters[itb] = 0x0;
182 //____________________________________________________________________
183 void AliTRDseedV1::Copy(TObject &ref) const
190 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
192 target.fReconstructor = fReconstructor;
193 target.fClusterIter = 0x0;
197 target.fS2PRF = fS2PRF;
198 target.fDiffL = fDiffL;
199 target.fDiffT = fDiffT;
200 target.fClusterIdx = 0;
212 target.fChi2 = fChi2;
214 memcpy(target.fIndexes, fIndexes, kNclusters*sizeof(Int_t));
215 memcpy(target.fClusters, fClusters, kNclusters*sizeof(AliTRDcluster*));
216 memcpy(target.fPad, fPad, 3*sizeof(Float_t));
217 target.fYref[0] = fYref[0]; target.fYref[1] = fYref[1];
218 target.fZref[0] = fZref[0]; target.fZref[1] = fZref[1];
219 target.fYfit[0] = fYfit[0]; target.fYfit[1] = fYfit[1];
220 target.fZfit[0] = fZfit[0]; target.fZfit[1] = fZfit[1];
221 memcpy(target.fdEdx, fdEdx, kNslices*sizeof(Float_t));
222 memcpy(target.fProb, fProb, AliPID::kSPECIES*sizeof(Float_t));
223 memcpy(target.fLabels, fLabels, 3*sizeof(Int_t));
224 memcpy(target.fRefCov, fRefCov, 7*sizeof(Double_t));
225 memcpy(target.fCov, fCov, 3*sizeof(Double_t));
231 //____________________________________________________________
232 Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
234 // Initialize this tracklet using the track information
237 // track - the TRD track used to initialize the tracklet
239 // Detailed description
240 // The function sets the starting point and direction of the
241 // tracklet according to the information from the TRD track.
244 // The TRD track has to be propagated to the beginning of the
245 // chamber where the tracklet will be constructed
249 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
255 //_____________________________________________________________________________
256 void AliTRDseedV1::Reset()
261 fExB=0.;fVD=0.;fT0=0.;fS2PRF=0.;
267 fdX=0.;fX0=0.; fX=0.; fY=0.; fZ=0.;
271 for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1;
272 memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
273 memset(fPad, 0, 3*sizeof(Float_t));
274 fYref[0] = 0.; fYref[1] = 0.;
275 fZref[0] = 0.; fZref[1] = 0.;
276 fYfit[0] = 0.; fYfit[1] = 0.;
277 fZfit[0] = 0.; fZfit[1] = 0.;
278 memset(fdEdx, 0, kNslices*sizeof(Float_t));
279 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
280 fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
281 fLabels[2]=0; // number of different labels for tracklet
282 memset(fRefCov, 0, 7*sizeof(Double_t));
283 // covariance matrix [diagonal]
284 // default sy = 200um and sz = 2.3 cm
285 fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
288 //____________________________________________________________________
289 void AliTRDseedV1::Update(const AliTRDtrackV1 *trk)
291 // update tracklet reference position from the TRD track
293 Double_t fSnp = trk->GetSnp();
294 Double_t fTgl = trk->GetTgl();
296 fYref[1] = fSnp/TMath::Sqrt(1. - fSnp*fSnp);
298 SetCovRef(trk->GetCovariance());
300 Double_t dx = trk->GetX() - fX0;
301 fYref[0] = trk->GetY() - dx*fYref[1];
302 fZref[0] = trk->GetZ() - dx*fZref[1];
305 //_____________________________________________________________________________
306 void AliTRDseedV1::UpdateUsed()
309 // Calculate number of used clusers in the tracklet
312 Int_t nused = 0, nshared = 0;
313 for (Int_t i = kNclusters; i--; ) {
314 if (!fClusters[i]) continue;
315 if(fClusters[i]->IsUsed()){
317 } else if(fClusters[i]->IsShared()){
318 if(IsStandAlone()) nused++;
326 //_____________________________________________________________________________
327 void AliTRDseedV1::UseClusters()
332 // In stand alone mode:
333 // Clusters which are marked as used or shared from another track are
334 // removed from the tracklet
337 // - Clusters which are used by another track become shared
338 // - Clusters which are attached to a kink track become shared
340 AliTRDcluster **c = &fClusters[0];
341 for (Int_t ic=kNclusters; ic--; c++) {
344 if((*c)->IsShared() || (*c)->IsUsed()){
345 if((*c)->IsShared()) SetNShared(GetNShared()-1);
346 else SetNUsed(GetNUsed()-1);
353 if((*c)->IsUsed() || IsKink()){
364 //____________________________________________________________________
365 void AliTRDseedV1::CookdEdx(Int_t nslices)
367 // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
370 // nslices : number of slices for which dE/dx should be calculated
372 // store results in the internal array fdEdx. This can be accessed with the method
373 // AliTRDseedV1::GetdEdx()
375 // Detailed description
376 // Calculates average dE/dx for all slices. Depending on the PID methode
377 // the number of slices can be 3 (LQ) or 8(NN).
378 // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t))
380 // The following effects are included in the calculation:
381 // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
382 // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
386 Int_t nclusters[kNslices];
387 memset(nclusters, 0, kNslices*sizeof(Int_t));
388 memset(fdEdx, 0, kNslices*sizeof(Float_t));
390 const Double_t kDriftLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
392 AliTRDcluster *c = 0x0;
393 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
394 if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue;
395 Float_t dx = TMath::Abs(fX0 - c->GetX());
397 // Filter clusters for dE/dx calculation
399 // 1.consider calibration effects for slice determination
401 if(dx<kDriftLength){ // TODO should be replaced by c->IsInChamber()
402 slice = Int_t(dx * nslices / kDriftLength);
403 } else slice = c->GetX() < fX0 ? nslices-1 : 0;
406 // 2. take sharing into account
407 Float_t w = /*c->IsShared() ? .5 :*/ 1.;
409 // 3. take into account large clusters TODO
410 //w *= c->GetNPads() > 3 ? .8 : 1.;
413 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
415 } // End of loop over clusters
417 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
418 if(nslices == AliTRDpidUtil::kLQslices){
419 // calculate mean charge per slice (only LQ PID)
420 for(int is=0; is<nslices; is++){
421 if(nclusters[is]) fdEdx[is] /= nclusters[is];
426 //_____________________________________________________________________________
427 void AliTRDseedV1::CookLabels()
430 // Cook 2 labels for seed
436 for (Int_t i = 0; i < kNclusters; i++) {
437 if (!fClusters[i]) continue;
438 for (Int_t ilab = 0; ilab < 3; ilab++) {
439 if (fClusters[i]->GetLabel(ilab) >= 0) {
440 labels[nlab] = fClusters[i]->GetLabel(ilab);
446 fLabels[2] = AliMathBase::Freq(nlab,labels,out,kTRUE);
448 if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2];
452 //____________________________________________________________________
453 Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
455 // Using the linear approximation of the track inside one TRD chamber (TRD tracklet)
456 // the charge per unit length can be written as:
458 // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dy}{dx}}^{2}_{ref}}}
460 // where qc is the total charge collected in the current time bin and dx is the length
461 // of the time bin. For the moment (Jan 20 2009) only pad row cross corrections are
462 // considered for the charge but none are applied for drift velocity variations along
463 // the drift region or assymetry of the TRF
465 // Author : Alex Bercuci <A.Bercuci@gsi.de>
468 if(fClusters[ic]) dq += TMath::Abs(fClusters[ic]->GetQ());
469 if(fClusters[ic+kNtb]) dq += TMath::Abs(fClusters[ic+kNtb]->GetQ());
470 if(dq<1.e-3 || fdX < 1.e-3) return 0.;
472 return dq/fdX/TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]);
475 //____________________________________________________________________
476 Float_t* AliTRDseedV1::GetProbability(Bool_t force)
478 if(!force) return &fProb[0];
479 if(!CookPID()) return 0x0;
483 //____________________________________________________________
484 Bool_t AliTRDseedV1::CookPID()
486 // Fill probability array for tracklet from the DB.
491 // returns pointer to the probability array and 0x0 if missing DB access
493 // Detailed description
496 // retrive calibration db
497 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
499 AliError("No access to calibration data");
503 if (!fReconstructor) {
504 AliError("Reconstructor not set.");
508 // Retrieve the CDB container class with the parametric detector response
509 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
511 AliError("No access to AliTRDCalPID object");
514 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
516 // calculate tracklet length TO DO
517 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
518 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
521 CookdEdx(fReconstructor->GetNdEdxSlices());
523 // Sets the a priori probabilities
524 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
525 fProb[ispec] = pd->GetProbability(ispec, GetMomentum(), &fdEdx[0], length, GetPlane());
531 //____________________________________________________________________
532 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
535 // Returns a quality measurement of the current seed
538 Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
540 .5 * TMath::Abs(18.0 - GetN())
541 + 10.* TMath::Abs(fYfit[1] - fYref[1])
542 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
543 + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength();
546 //____________________________________________________________________
547 void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const
549 // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
550 // and returns the results in the preallocated array cov[3] as :
557 // For the linear transformation
561 // The error propagation has the general form
563 // C_{Y} = T_{x} C_{X} T_{x}^{T}
565 // We apply this formula 2 times. First to calculate the covariance of the tracklet
566 // at point x we consider:
568 // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
570 // and secondly to take into account the tilt angle
572 // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
575 // using simple trigonometrics one can write for this last case
577 // C_{Y}=#frac{1}{1+tg^{2}#alpha} #(){#splitline{(#sigma_{y}^{2}+tg^{2}#alpha#sigma_{z}^{2}) __ tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2})}{tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2}) __ (#sigma_{z}^{2}+tg^{2}#alpha#sigma_{y}^{2})}}
579 // which can be aproximated for small alphas (2 deg) with
581 // C_{Y}=#(){#splitline{#sigma_{y}^{2} __ (#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha}{((#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha __ #sigma_{z}^{2}}}
584 // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
585 // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
586 // account for extra misalignment/miscalibration uncertainties.
589 // Alex Bercuci <A.Bercuci@gsi.de>
590 // Date : Jan 8th 2009
595 Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2];
597 //GetPadLength()*GetPadLength()/12.;
599 // insert systematic uncertainties
601 Double_t sys[15]; memset(sys, 0, 15*sizeof(Double_t));
602 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
606 // rotate covariance matrix
607 Double_t t2 = GetTilt()*GetTilt();
608 Double_t correction = 1./(1. + t2);
609 cov[0] = (sy2+t2*sz2)*correction;
610 cov[1] = GetTilt()*(sz2 - sy2)*correction;
611 cov[2] = (t2*sy2+sz2)*correction;
613 //printf("C(%6.1f %+6.3f %6.1f) [%s]\n", 1.e4*TMath::Sqrt(cov[0]), cov[1], 1.e4*TMath::Sqrt(cov[2]), IsRowCross()?" RC ":"-");
616 //____________________________________________________________
617 Double_t AliTRDseedV1::GetCovSqrt(Double_t *c, Double_t *d)
619 // Helper function to calculate the square root of the covariance matrix.
620 // The input matrix is stored in the vector c and the result in the vector d.
621 // Both arrays have to be initialized by the user with at least 3 elements. Return negative in case of failure.
623 // For calculating the square root of the symmetric matrix c
624 // the following relation is used:
626 // C^{1/2} = VD^{1/2}V^{-1}
628 // with V being the matrix with the n eigenvectors as columns.
629 // In case C is symmetric the followings are true:
630 // - matrix D is diagonal with the diagonal given by the eigenvalues of C
633 // Author A.Bercuci <A.Bercuci@gsi.de>
636 Double_t L[2], // eigenvalues
637 V[3]; // eigenvectors
638 // the secular equation and its solution :
639 // (c[0]-L)(c[2]-L)-c[1]^2 = 0
640 // L^2 - L*Tr(c)+DET(c) = 0
641 // L12 = [Tr(c) +- sqrt(Tr(c)^2-4*DET(c))]/2
642 Double_t Tr = c[0]+c[2], // trace
643 DET = c[0]*c[2]-c[1]*c[1]; // determinant
644 if(TMath::Abs(DET)<1.e-20) return -1.;
645 Double_t DD = TMath::Sqrt(Tr*Tr - 4*DET);
648 if(L[0]<0. || L[1]<0.) return -1.;
653 Double_t tmp = (L[0]-c[0])/c[1];
654 V[0] = TMath::Sqrt(1./(tmp*tmp+1));
656 V[2] = V[1]*c[1]/(L[1]-c[2]);
658 L[0] = TMath::Sqrt(L[0]); L[1] = TMath::Sqrt(L[1]);
659 d[0] = V[0]*V[0]*L[0]+V[1]*V[1]*L[1];
660 d[1] = V[0]*V[1]*L[0]+V[1]*V[2]*L[1];
661 d[2] = V[1]*V[1]*L[0]+V[2]*V[2]*L[1];
666 //____________________________________________________________
667 Double_t AliTRDseedV1::GetCovInv(Double_t *c, Double_t *d)
669 // Helper function to calculate the inverse of the covariance matrix.
670 // The input matrix is stored in the vector c and the result in the vector d.
671 // Both arrays have to be initialized by the user with at least 3 elements
672 // The return value is the determinant or 0 in case of singularity.
674 // Author A.Bercuci <A.Bercuci@gsi.de>
677 Double_t Det = c[0]*c[2] - c[1]*c[1];
678 if(TMath::Abs(Det)<1.e-20) return 0.;
679 Double_t InvDet = 1./Det;
686 //____________________________________________________________________
687 UShort_t AliTRDseedV1::GetVolumeId() const
690 while(ic<kNclusters && !fClusters[ic]) ic++;
691 return fClusters[ic] ? fClusters[ic]->GetVolumeId() : 0;
695 //____________________________________________________________________
696 void AliTRDseedV1::Calibrate()
698 // Retrieve calibration and position parameters from OCDB.
699 // The following information are used
701 // - column and row position of first attached cluster. If no clusters are attached
702 // to the tracklet a random central chamber position (c=70, r=7) will be used.
704 // The following information is cached in the tracklet
705 // t0 (trigger delay)
708 // omega*tau = tg(a_L)
709 // diffusion coefficients (longitudinal and transversal)
712 // Alex Bercuci <A.Bercuci@gsi.de>
713 // Date : Jan 8th 2009
716 AliCDBManager *cdb = AliCDBManager::Instance();
717 if(cdb->GetRun() < 0){
718 AliError("OCDB manager not properly initialized");
722 AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
723 AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
724 *t0ROC = calib->GetT0ROC(fDet);;
725 const AliTRDCalDet *vdDet = calib->GetVdriftDet();
726 const AliTRDCalDet *t0Det = calib->GetT0Det();
728 Int_t col = 70, row = 7;
729 AliTRDcluster **c = &fClusters[0];
732 while (ic<kNclusters && !(*c)){ic++; c++;}
734 col = (*c)->GetPadCol();
735 row = (*c)->GetPadRow();
739 fT0 = t0Det->GetValue(fDet) + t0ROC->GetValue(col,row);
740 fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
741 fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
742 fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
743 AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
745 SetBit(kCalib, kTRUE);
748 //____________________________________________________________________
749 void AliTRDseedV1::SetOwner()
751 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
753 if(TestBit(kOwner)) return;
754 for(int ic=0; ic<kNclusters; ic++){
755 if(!fClusters[ic]) continue;
756 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
761 //____________________________________________________________
762 void AliTRDseedV1::SetPadPlane(AliTRDpadPlane *p)
764 // Shortcut method to initialize pad geometry.
766 SetTilt(TMath::Tan(TMath::DegToRad()*p->GetTiltingAngle()));
767 SetPadLength(p->GetLengthIPad());
768 SetPadWidth(p->GetWidthIPad());
772 //____________________________________________________________________
773 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt)
776 // Projective algorithm to attach clusters to seeding tracklets
782 // Detailed description
783 // 1. Collapse x coordinate for the full detector plane
784 // 2. truncated mean on y (r-phi) direction
786 // 4. truncated mean on z direction
790 Bool_t kPRINT = kFALSE;
791 if(!fReconstructor->GetRecoParam() ){
792 AliError("Seed can not be used without a valid RecoParam.");
795 // Initialize reco params for this tracklet
796 // 1. first time bin in the drift region
798 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
800 Double_t syRef = TMath::Sqrt(fRefCov[0]);
802 Double_t kroady = 1.;
803 //fReconstructor->GetRecoParam() ->GetRoad1y();
804 Double_t kroadz = GetPadLength() * 1.5 + 1.;
805 if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady);
808 const Int_t kNrows = 16;
809 AliTRDcluster *clst[kNrows][kNclusters];
810 Double_t cond[4], dx, dy, yt, zt,
811 yres[kNrows][kNclusters];
812 Int_t idxs[kNrows][kNclusters], ncl[kNrows], ncls = 0;
813 memset(ncl, 0, kNrows*sizeof(Int_t));
814 memset(clst, 0, kNrows*kNclusters*sizeof(AliTRDcluster*));
816 // Do cluster projection
817 AliTRDcluster *c = 0x0;
818 AliTRDchamberTimeBin *layer = 0x0;
819 Bool_t kBUFFER = kFALSE;
820 for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
821 if(!(layer = chamber->GetTB(it))) continue;
822 if(!Int_t(*layer)) continue;
824 dx = fX0 - layer->GetX();
825 yt = fYref[0] - fYref[1] * dx;
826 zt = fZref[0] - fZref[1] * dx;
827 if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt);
829 // select clusters on a 5 sigmaKalman level
830 cond[0] = yt; cond[2] = kroady;
831 cond[1] = zt; cond[3] = kroadz;
833 layer->GetClusters(cond, idx, n, 6);
834 for(Int_t ic = n; ic--;){
835 c = (*layer)[idx[ic]];
837 dy += tilt ? GetTilt() * (c->GetZ() - zt) : 0.;
838 // select clusters on a 3 sigmaKalman level
839 /* if(tilt && TMath::Abs(dy) > 3.*syRef){
840 printf("too large !!!\n");
843 Int_t r = c->GetPadRow();
844 if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r);
846 idxs[r][ncl[r]] = idx[ic];
847 yres[r][ncl[r]] = dy;
850 if(ncl[r] >= kNclusters) {
851 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kNclusters));
858 if(kPRINT) printf("Found %d clusters\n", ncls);
859 if(ncls<kClmin) return kFALSE;
861 // analyze each row individualy
862 Double_t mean, syDis;
863 Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1;
864 for(Int_t ir=kNrows; ir--;){
865 if(!(ncl[ir])) continue;
866 if(lr>0 && lr-ir != 1){
867 if(kPRINT) printf("W - gap in rows attached !!\n");
869 if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]);
870 // Evaluate truncated mean on the y direction
871 if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8));
873 mean = 0.; syDis = 0.;
876 // TODO check mean and sigma agains cluster resolution !!
877 if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis);
878 // select clusters on a 3 sigmaDistr level
879 Bool_t kFOUND = kFALSE;
880 for(Int_t ic = ncl[ir]; ic--;){
881 if(yres[ir][ic] - mean > 3. * syDis){
882 clst[ir][ic] = 0x0; continue;
884 nrow[nr]++; kFOUND = kTRUE;
888 lr = ir; if(nr>=3) break;
890 if(kPRINT) printf("lr[%d] nr[%d] nrow[0]=%d nrow[1]=%d nrow[2]=%d\n", lr, nr, nrow[0], nrow[1], nrow[2]);
892 // classify cluster rows
899 SetBit(kRowCross, kTRUE); // mark pad row crossing
900 if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;}
909 SetBit(kRowCross, kTRUE); // mark pad row crossing
912 if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]);
913 if(row<0) return kFALSE;
915 // Select and store clusters
916 // We should consider here :
917 // 1. How far is the chamber boundary
918 // 2. How big is the mean
920 for (Int_t ir = 0; ir < nr; ir++) {
921 Int_t jr = row + ir*lr;
922 if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr);
923 for (Int_t ic = 0; ic < ncl[jr]; ic++) {
924 if(!(c = clst[jr][ic])) continue;
925 Int_t it = c->GetPadTime();
926 // TODO proper indexing of clusters !!
927 fIndexes[it+kNtb*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]);
928 fClusters[it+kNtb*ir] = c;
930 //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]);
936 // number of minimum numbers of clusters expected for the tracklet
938 //AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", n, kClmin));
943 // Load calibration parameters for this tracklet
946 // calculate dx for time bins in the drift region (calibration aware)
947 Int_t irp = 0; Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
948 for (Int_t it = t0; it < AliTRDtrackerV1::GetNTimeBins(); it++) {
949 if(!fClusters[it]) continue;
950 x[irp] = fClusters[it]->GetX();
955 Int_t dtb = tb[1] - tb[0];
956 fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
961 //____________________________________________________________
962 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
964 // Fill in all derived information. It has to be called after recovery from file or HLT.
965 // The primitive data are
966 // - list of clusters
967 // - detector (as the detector will be removed from clusters)
968 // - position of anode wire (fX0) - temporary
969 // - track reference position and direction
970 // - momentum of the track
971 // - time bin length [cm]
973 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
975 fReconstructor = rec;
977 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
978 fPad[0] = pp->GetLengthIPad();
979 fPad[1] = pp->GetWidthIPad();
980 fPad[3] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
981 //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
983 Int_t n = 0, nshare = 0, nused = 0;
984 AliTRDcluster **cit = &fClusters[0];
985 for(Int_t ic = kNclusters; ic--; cit++){
988 if((*cit)->IsShared()) nshare++;
989 if((*cit)->IsUsed()) nused++;
991 SetN(n); SetNUsed(nused); SetNShared(nshare);
998 //____________________________________________________________________
999 Bool_t AliTRDseedV1::Fit(Bool_t tilt, Bool_t zcorr)
1002 // Linear fit of the clusters attached to the tracklet
1005 // - tilt : switch for tilt pad correction of cluster y position based on
1006 // the z, dzdx info from outside [default false].
1007 // - zcorr : switch for using z information to correct for anisochronity
1008 // and a finner error parametrization estimation [default false]
1010 // True if successful
1012 // Detailed description
1014 // Fit in the xy plane
1018 if(!IsCalibrated()) Calibrate();
1020 const Int_t kClmin = 8;
1023 // cluster error parametrization parameters
1024 // 1. sy total charge
1025 const Float_t sq0inv = 0.019962; // [1/q0]
1026 const Float_t sqb = 1.0281564; //[cm]
1027 // 2. sy for the PRF
1028 const Float_t scy[AliTRDgeometry::kNlayer][4] = {
1029 {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02},
1030 {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02},
1031 {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02},
1032 {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02},
1033 {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02},
1034 {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02},
1037 // get track direction
1038 Double_t y0 = fYref[0];
1039 Double_t dydx = fYref[1];
1040 Double_t z0 = fZref[0];
1041 Double_t dzdx = fZref[1];
1044 // calculation of tg^2(phi - a_L) and tg^2(a_L)
1045 Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg;
1046 //Double_t exb2= fExB*fExB;
1048 //AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
1049 TLinearFitter fitterY(1, "pol1");
1050 TLinearFitter fitterZ(1, "pol1");
1052 // book cluster information
1053 Double_t qc[kNclusters], xc[kNclusters], yc[kNclusters], zc[kNclusters], sy[kNclusters];
1055 Int_t ily = AliTRDgeometry::GetLayer(fDet);
1057 AliTRDcluster *c=0x0, **jc = &fClusters[0];
1058 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
1064 if(!(c = (*jc))) continue;
1065 if(!c->IsInChamber()) continue;
1068 if(c->GetNPads()>4) w = .5;
1069 if(c->GetNPads()>5) w = .2;
1070 Int_t tb = c->GetLocalTimeBin();
1072 qc[n] = TMath::Abs(c->GetQ());
1073 // Radial cluster position
1074 //Int_t jc = TMath::Max(fN-3, 0);
1075 //xc[fN] = c->GetXloc(fT0, fVD, &qc[jc], &xc[jc]/*, z0 - c->GetX()*dzdx*/);
1076 xc[n] = fX0 - c->GetX();
1078 //Double_t s2 = fS2PRF + fDiffL*fDiffL*xc[n]/(1.+2.*exb2)+tgg*xc[n]*xc[n]*exb2/12.;
1079 //yc[fN] = c->GetYloc(s2, GetPadWidth(), xc[fN], fExB);
1080 yc[n] = c->GetY()-AliTRDcluster::GetYcorr(ily, c->GetCenter());
1083 // extrapolated y value for the track
1084 yt = y0 - xc[n]*dydx;
1085 // extrapolated z value for the track
1086 zt = z0 - xc[n]*dzdx;
1088 if(tilt) yc[n] -= GetTilt()*(zc[n] - zt);
1090 // ELABORATE CLUSTER ERROR
1091 // basic y error (|| to track).
1092 sy[n] = AliTRDcluster::GetSY(tb, zcorr?zt:-1.);
1093 //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4);
1094 // y error due to total charge
1095 sy[n] += sqb*(1./qc[n] - sq0inv);
1096 //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4);
1097 // y error due to PRF
1098 sy[n] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3];
1099 //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4);
1104 // error of drift length parallel to the track
1105 Double_t sx = AliTRDcluster::GetSX(tb, zcorr?zt:-1.); // [cm]
1106 //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4);
1107 sx *= sx; // square sx
1109 // add error from ExB
1110 sy[n] += fExB*fExB*sx;
1111 //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8);
1113 // global radial error due to misalignment/miscalibration
1114 Double_t sx0 = 0.; sx0 *= sx0;
1115 // add sx contribution to sy due to track angle
1116 sy[n] += tgg*(sx+sx0);
1117 // TODO we should add tilt pad correction here
1118 //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8);
1119 c->SetSigmaY2(sy[n]);
1121 sy[n] = TMath::Sqrt(sy[n]);
1122 fitterY.AddPoint(&xc[n], yc[n], sy[n]);
1123 fitterZ.AddPoint(&xc[n], qc[n], 1.);
1127 if (n < kClmin) return kFALSE;
1131 fYfit[0] = fitterY.GetParameter(0);
1132 fYfit[1] = -fitterY.GetParameter(1);
1134 Double_t *p = fitterY.GetCovarianceMatrix();
1135 fCov[0] = p[0]; // variance of y0
1136 fCov[1] = p[1]; // covariance of y0, dydx
1137 fCov[2] = p[3]; // variance of dydx
1138 // the ref radial position is set at the minimum of
1139 // the y variance of the tracklet
1140 fX = -fCov[1]/fCov[2];
1144 Int_t ic=n=kNclusters-1; jc = &fClusters[ic];
1145 for(; ic>kNtb; ic--, --jc){
1146 if(!(c = (*jc))) continue;
1147 if(!c->IsInChamber()) continue;
1148 qc[n] = TMath::Abs(c->GetQ());
1149 xc[n] = fX0 - c->GetX();
1151 fitterZ.AddPoint(&xc[n], -qc[n], 1.);
1156 if(fitterZ.GetParameter(1)!=0.){
1157 fX = -fitterZ.GetParameter(0)/fitterZ.GetParameter(1);
1159 Float_t dl = .5*AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght();
1161 fX-=.055; // TODO to be understood
1164 fZfit[0] = .5*(zc[0]+zc[kNclusters-1]); fZfit[1] = 0.;
1165 // temporary external error parameterization
1166 fS2Z = 0.05+0.4*TMath::Abs(fZref[1]); fS2Z *= fS2Z;
1167 // TODO correct formula
1168 //fS2Z = sigma_x*TMath::Abs(fZref[1]);
1170 fZfit[0] = zc[0]; fZfit[1] = 0.;
1171 fS2Z = GetPadLength()*GetPadLength()/12.;
1173 fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2];
1175 // // determine z offset of the fit
1176 // Float_t zslope = 0.;
1177 // Int_t nchanges = 0, nCross = 0;
1178 // if(nz==2){ // tracklet is crossing pad row
1179 // // Find the break time allowing one chage on pad-rows
1180 // // with maximal number of accepted clusters
1181 // Int_t padRef = zRow[0];
1182 // for (Int_t ic=1; ic<fN; ic++) {
1183 // if(zRow[ic] == padRef) continue;
1186 // if(zRow[ic-1] == zRow[ic]){
1187 // printf("ERROR in pad row change!!!\n");
1190 // // evaluate parameters of the crossing point
1191 // Float_t sx = (xc[ic-1] - xc[ic])*convert;
1192 // fCross[0] = .5 * (xc[ic-1] + xc[ic]);
1193 // fCross[2] = .5 * (zc[ic-1] + zc[ic]);
1194 // fCross[3] = TMath::Max(dzdx * sx, .01);
1195 // zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
1196 // padRef = zRow[ic];
1202 // // condition on nCross and reset nchanges TODO
1205 // if(dzdx * zslope < 0.){
1206 // AliInfo("Tracklet-Track mismatch in dzdx. TODO.");
1210 // //zc[nc] = fitterZ.GetFunctionParameter(0);
1211 // fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
1212 // fCross[0] = fX0 - fCross[0];
1218 //_____________________________________________________________________________
1219 void AliTRDseedV1::FitMI()
1223 // Marian Ivanov's version
1225 // linear fit on the y direction with respect to the reference direction.
1226 // The residuals for each x (x = xc - x0) are deduced from:
1228 // the tilting correction is written :
1229 // y = yc + h*(zc-zt) (2)
1230 // yt = y0+dy/dx*x (3)
1231 // zt = z0+dz/dx*x (4)
1232 // from (1),(2),(3) and (4)
1233 // dy = yc - y0 - (dy/dx + h*dz/dx)*x + h*(zc-z0)
1234 // the last term introduces the correction on y direction due to tilting pads. There are 2 ways to account for this:
1235 // 1. use tilting correction for calculating the y
1236 // 2. neglect tilting correction here and account for it in the error parametrization of the tracklet.
1237 const Float_t kRatio = 0.8;
1238 const Int_t kClmin = 5;
1239 const Float_t kmaxtan = 2;
1241 if (TMath::Abs(fYref[1]) > kmaxtan){
1242 //printf("Exit: Abs(fYref[1]) = %3.3f, kmaxtan = %3.3f\n", TMath::Abs(fYref[1]), kmaxtan);
1243 return; // Track inclined too much
1246 Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
1247 Float_t ycrosscor = GetPadLength() * GetTilt() * 0.5; // Y correction for crossing
1258 // Buffering: Leave it constant fot Performance issues
1259 Int_t zints[kNtb]; // Histograming of the z coordinate
1260 // Get 1 and second max probable coodinates in z
1261 Int_t zouts[2*kNtb];
1262 Float_t allowedz[kNtb]; // Allowed z for given time bin
1263 Float_t yres[kNtb]; // Residuals from reference
1264 //Float_t anglecor = GetTilt() * fZref[1]; // Correction to the angle
1266 Float_t pos[3*kNtb]; memset(pos, 0, 3*kNtb*sizeof(Float_t));
1267 Float_t *fX = &pos[0], *fY = &pos[kNtb], *fZ = &pos[2*kNtb];
1269 Int_t fN = 0; AliTRDcluster *c = 0x0;
1271 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1273 if (!(c = fClusters[i])) continue;
1274 if(!c->IsInChamber()) continue;
1276 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1277 fX[i] = fX0 - c->GetX();
1280 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1281 zints[fN] = Int_t(fZ[i]);
1286 //printf("Exit fN < kClmin: fN = %d\n", fN);
1289 Int_t nz = AliTRDtrackerV1::Freq(fN, zints, zouts, kFALSE);
1290 Float_t fZProb = zouts[0];
1291 if (nz <= 1) zouts[3] = 0;
1292 if (zouts[1] + zouts[3] < kClmin) {
1293 //printf("Exit zouts[1] = %d, zouts[3] = %d\n",zouts[1],zouts[3]);
1297 // Z distance bigger than pad - length
1298 if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) zouts[3] = 0;
1300 Int_t breaktime = -1;
1301 Bool_t mbefore = kFALSE;
1302 Int_t cumul[kNtb][2];
1303 Int_t counts[2] = { 0, 0 };
1305 if (zouts[3] >= 3) {
1308 // Find the break time allowing one chage on pad-rows
1309 // with maximal number of accepted clusters
1312 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1313 cumul[i][0] = counts[0];
1314 cumul[i][1] = counts[1];
1315 if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++;
1316 if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++;
1319 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins(); i++) {
1320 Int_t after = cumul[AliTRDtrackerV1::GetNTimeBins()][0] - cumul[i][0];
1321 Int_t before = cumul[i][1];
1322 if (after + before > maxcount) {
1323 maxcount = after + before;
1327 after = cumul[AliTRDtrackerV1::GetNTimeBins()-1][1] - cumul[i][1];
1328 before = cumul[i][0];
1329 if (after + before > maxcount) {
1330 maxcount = after + before;
1338 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1339 if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0];
1340 if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0];
1343 if (((allowedz[0] > allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] < 0)) ||
1344 ((allowedz[0] < allowedz[AliTRDtrackerV1::GetNTimeBins()]) && (fZref[1] > 0))) {
1346 // Tracklet z-direction not in correspondance with track z direction
1349 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1350 allowedz[i] = zouts[0]; // Only longest taken
1356 // Cross pad -row tracklet - take the step change into account
1358 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1359 if (!fClusters[i]) continue;
1360 if(!fClusters[i]->IsInChamber()) continue;
1361 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1363 //yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i] + GetTilt()*(fZ[i] - fZref[0]);
1364 yres[i] = fY[i] - GetTilt()*(fZ[i] - (fZref[0] - fX[i]*fZref[1]));
1365 // if (TMath::Abs(fZ[i] - fZProb) > 2) {
1366 // if (fZ[i] > fZProb) yres[i] += GetTilt() * GetPadLength();
1367 // if (fZ[i] < fZProb) yres[i] -= GetTilt() * GetPadLength();
1372 Double_t yres2[kNtb];
1375 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1376 if (!fClusters[i]) continue;
1377 if(!fClusters[i]->IsInChamber()) continue;
1378 if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue;
1379 yres2[fN2] = yres[i];
1383 //printf("Exit fN2 < kClmin: fN2 = %d\n", fN2);
1387 AliMathBase::EvaluateUni(fN2,yres2,mean,sigma, Int_t(fN2*kRatio-2.));
1388 if (sigma < sigmaexp * 0.8) {
1391 //Float_t fSigmaY = sigma;
1406 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1407 if (!fClusters[i]) continue;
1408 if (!fClusters[i]->IsInChamber()) continue;
1409 if (TMath::Abs(fZ[i] - allowedz[i]) > 2){fClusters[i] = 0x0; continue;}
1410 if (TMath::Abs(yres[i] - mean) > 4.0 * sigma){fClusters[i] = 0x0; continue;}
1413 fMPads += fClusters[i]->GetNPads();
1414 Float_t weight = 1.0;
1415 if (fClusters[i]->GetNPads() > 4) weight = 0.5;
1416 if (fClusters[i]->GetNPads() > 5) weight = 0.2;
1420 //printf("x = %7.3f dy = %7.3f fit %7.3f\n", x, yres[i], fY[i]-yres[i]);
1423 sumwx += x * weight;
1424 sumwx2 += x*x * weight;
1425 sumwy += weight * yres[i];
1426 sumwxy += weight * (yres[i]) * x;
1427 sumwz += weight * fZ[i];
1428 sumwxz += weight * fZ[i] * x;
1433 //printf("Exit fN2 < kClmin(2): fN2 = %d\n",fN2);
1437 fMeanz = sumwz / sumw;
1438 Float_t correction = 0;
1440 // Tracklet on boundary
1441 if (fMeanz < fZProb) correction = ycrosscor;
1442 if (fMeanz > fZProb) correction = -ycrosscor;
1445 Double_t det = sumw * sumwx2 - sumwx * sumwx;
1446 fYfit[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
1447 fYfit[1] = (sumw * sumwxy - sumwx * sumwy) / det;
1450 for (Int_t i = 0; i < AliTRDtrackerV1::GetNTimeBins()+1; i++) {
1451 if (!TESTBIT(fUsable,i)) continue;
1452 Float_t delta = yres[i] - fYfit[0] - fYfit[1] * fX[i];
1453 fS2Y += delta*delta;
1455 fS2Y = TMath::Sqrt(fS2Y / Float_t(fN2-2));
1456 // TEMPORARY UNTIL covariance properly calculated
1457 fS2Y = TMath::Max(fS2Y, Float_t(.1));
1459 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
1460 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
1461 // fYfitR[0] += fYref[0] + correction;
1462 // fYfitR[1] += fYref[1];
1463 // fYfit[0] = fYfitR[0];
1464 fYfit[1] = -fYfit[1];
1469 //___________________________________________________________________
1470 void AliTRDseedV1::Print(Option_t *o) const
1473 // Printing the seedstatus
1476 AliInfo(Form("Det[%3d] X0[%7.2f] Pad{L[%5.2f] W[%5.2f] Tilt[%+6.2f]}", fDet, fX0, GetPadLength(), GetPadWidth(), GetTilt()));
1477 AliInfo(Form("N[%2d] Nused[%2d] Nshared[%2d] [%d]", GetN(), GetNUsed(), GetNShared(), fN));
1478 AliInfo(Form("FLAGS : RC[%c] Kink[%c] SA[%c]", IsRowCross()?'y':'n', IsKink()?'y':'n', IsStandAlone()?'y':'n'));
1480 Double_t cov[3], x=GetX();
1482 AliInfo(" | x[cm] | y[cm] | z[cm] | dydx | dzdx |");
1483 AliInfo(Form("Fit | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | ----- |", x, GetY(), TMath::Sqrt(cov[0]), GetZ(), TMath::Sqrt(cov[2]), fYfit[1]));
1484 AliInfo(Form("Ref | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | %5.2f |", x, fYref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[0]), fZref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[2]), fYref[1], fZref[1]))
1487 if(strcmp(o, "a")!=0) return;
1489 AliTRDcluster* const* jc = &fClusters[0];
1490 for(int ic=0; ic<kNclusters; ic++, jc++) {
1491 if(!(*jc)) continue;
1497 //___________________________________________________________________
1498 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
1500 // Checks if current instance of the class has the same essential members
1503 if(!o) return kFALSE;
1504 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
1505 if(!inTracklet) return kFALSE;
1507 for (Int_t i = 0; i < 2; i++){
1508 if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
1509 if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
1512 if ( fS2Y != inTracklet->fS2Y ) return kFALSE;
1513 if ( GetTilt() != inTracklet->GetTilt() ) return kFALSE;
1514 if ( GetPadLength() != inTracklet->GetPadLength() ) return kFALSE;
1516 for (Int_t i = 0; i < kNclusters; i++){
1517 // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
1518 // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
1519 // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
1520 if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
1522 // if ( fUsable != inTracklet->fUsable ) return kFALSE;
1524 for (Int_t i=0; i < 2; i++){
1525 if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
1526 if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
1527 if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
1530 /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
1531 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
1532 if ( fN != inTracklet->fN ) return kFALSE;
1533 //if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
1534 //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
1535 //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
1537 if ( fC != inTracklet->fC ) return kFALSE;
1538 //if ( fCC != inTracklet->GetCC() ) return kFALSE;
1539 if ( fChi2 != inTracklet->fChi2 ) return kFALSE;
1540 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
1542 if ( fDet != inTracklet->fDet ) return kFALSE;
1543 if ( fPt != inTracklet->fPt ) return kFALSE;
1544 if ( fdX != inTracklet->fdX ) return kFALSE;
1546 for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){
1547 AliTRDcluster *curCluster = fClusters[iCluster];
1548 AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
1549 if (curCluster && inCluster){
1550 if (! curCluster->IsEqual(inCluster) ) {
1551 curCluster->Print();
1556 // if one cluster exists, and corresponding
1557 // in other tracklet doesn't - return kFALSE
1558 if(curCluster || inCluster) return kFALSE;