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 *
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12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
18 ////////////////////////////////////////////////////////////////////////////
20 // The TRD track seed //
23 // Alex Bercuci <A.Bercuci@gsi.de> //
24 // Markus Fasel <M.Fasel@gsi.de> //
26 ////////////////////////////////////////////////////////////////////////////
29 #include "TLinearFitter.h"
30 #include "TClonesArray.h" // tmp
31 #include <TTreeStream.h>
34 #include "AliMathBase.h"
36 #include "AliTRDpadPlane.h"
37 #include "AliTRDcluster.h"
38 #include "AliTRDseedV1.h"
39 #include "AliTRDtrackV1.h"
40 #include "AliTRDcalibDB.h"
41 #include "AliTRDchamberTimeBin.h"
42 #include "AliTRDtrackingChamber.h"
43 #include "AliTRDtrackerV1.h"
44 #include "AliTRDReconstructor.h"
45 #include "AliTRDrecoParam.h"
46 #include "Cal/AliTRDCalPID.h"
48 ClassImp(AliTRDseedV1)
50 //____________________________________________________________________
51 AliTRDseedV1::AliTRDseedV1(Int_t det)
66 //printf("AliTRDseedV1::AliTRDseedV1()\n");
68 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.;
69 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
70 fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.;
73 //____________________________________________________________________
74 AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
75 :AliTRDseed((AliTRDseed&)ref)
76 ,fReconstructor(ref.fReconstructor)
87 // Copy Constructor performing a deep copy
90 //printf("AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &)\n");
91 SetBit(kOwner, kFALSE);
92 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice];
93 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec];
94 memcpy(fRefCov, ref.fRefCov, 3*sizeof(Double_t));
98 //____________________________________________________________________
99 AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
102 // Assignment Operator using the copy function
108 SetBit(kOwner, kFALSE);
114 //____________________________________________________________________
115 AliTRDseedV1::~AliTRDseedV1()
118 // Destructor. The RecoParam object belongs to the underlying tracker.
121 //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
124 for(int itb=0; itb<knTimebins; itb++){
125 if(!fClusters[itb]) continue;
126 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
127 delete fClusters[itb];
128 fClusters[itb] = 0x0;
132 //____________________________________________________________________
133 void AliTRDseedV1::Copy(TObject &ref) const
140 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
142 target.fClusterIter = 0x0;
143 target.fClusterIdx = 0;
149 target.fXref = fXref;
150 target.fReconstructor = fReconstructor;
152 for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice];
153 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec];
154 memcpy(target.fRefCov, fRefCov, 3*sizeof(Double_t));
156 AliTRDseed::Copy(target);
160 //____________________________________________________________
161 Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
163 // Initialize this tracklet using the track information
166 // track - the TRD track used to initialize the tracklet
168 // Detailed description
169 // The function sets the starting point and direction of the
170 // tracklet according to the information from the TRD track.
173 // The TRD track has to be propagated to the beginning of the
174 // chamber where the tracklet will be constructed
178 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
180 fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp());
182 fZref[1] = track->GetTgl();
184 const Double_t *cov = track->GetCovariance();
185 fRefCov[0] = cov[0]; // Var(y)
186 fRefCov[1] = cov[1]; // Cov(yz)
187 fRefCov[2] = cov[5]; // Var(z)
189 //printf("Tracklet ref x[%7.3f] y[%7.3f] z[%7.3f], snp[%f] tgl[%f]\n", fX0, fYref[0], fZref[0], track->GetSnp(), track->GetTgl());
194 //____________________________________________________________________
195 void AliTRDseedV1::CookdEdx(Int_t nslices)
197 // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
200 // nslices : number of slices for which dE/dx should be calculated
202 // store results in the internal array fdEdx. This can be accessed with the method
203 // AliTRDseedV1::GetdEdx()
205 // Detailed description
206 // Calculates average dE/dx for all slices. Depending on the PID methode
207 // the number of slices can be 3 (LQ) or 8(NN).
208 // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e.
210 // dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2))
212 // The following effects are included in the calculation:
213 // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
214 // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
218 Int_t nclusters[knSlices];
219 for(int i=0; i<knSlices; i++){
223 Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
225 AliTRDcluster *cluster = 0x0;
226 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
227 if(!(cluster = fClusters[ic])) continue;
228 Float_t x = cluster->GetX();
230 // Filter clusters for dE/dx calculation
232 // 1.consider calibration effects for slice determination
234 if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength);
235 else slice = x < fX0 ? 0 : nslices-1;
237 // 2. take sharing into account
238 Float_t w = cluster->IsShared() ? .5 : 1.;
240 // 3. take into account large clusters TODO
241 //w *= c->GetNPads() > 3 ? .8 : 1.;
244 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
246 } // End of loop over clusters
248 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
249 if(nslices == AliTRDReconstructor::kLQslices){
250 // calculate mean charge per slice (only LQ PID)
251 for(int is=0; is<nslices; is++){
252 if(nclusters[is]) fdEdx[is] /= nclusters[is];
258 //____________________________________________________________________
259 Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
261 return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.;
264 //____________________________________________________________________
265 Double_t* AliTRDseedV1::GetProbability()
267 // Fill probability array for tracklet from the DB.
272 // returns pointer to the probability array and 0x0 if missing DB access
274 // Detailed description
277 // retrive calibration db
278 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
280 AliError("No access to calibration data");
284 if (!fReconstructor) {
285 AliError("Reconstructor not set.");
289 // Retrieve the CDB container class with the parametric detector response
290 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
292 AliError("No access to AliTRDCalPID object");
295 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
297 // calculate tracklet length TO DO
298 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
299 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
302 CookdEdx(fReconstructor->GetNdEdxSlices());
304 // Sets the a priori probabilities
305 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
306 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane());
312 //____________________________________________________________________
313 Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
316 // Returns a quality measurement of the current seed
319 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
321 .5 * TMath::Abs(18.0 - fN2)
322 + 10.* TMath::Abs(fYfit[1] - fYref[1])
323 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
324 + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength;
327 //____________________________________________________________________
328 void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const
330 // Computes covariance in the y-z plane at radial point x
332 Int_t ic = 0; while (!fClusters[ic]) ic++;
333 AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance();
334 Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1);
336 Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB);
337 Double_t sz2 = fPadLength/12.;
340 //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2);
343 cov[1] = fTilt*(sy2-sz2);
346 // insert systematic uncertainties calibration and misalignment
348 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
349 cov[0] += (sys[0]*sys[0]);
350 cov[2] += (sys[1]*sys[1]);
354 //____________________________________________________________________
355 void AliTRDseedV1::SetOwner()
357 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
359 if(TestBit(kOwner)) return;
360 for(int ic=0; ic<knTimebins; ic++){
361 if(!fClusters[ic]) continue;
362 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
367 //____________________________________________________________________
368 Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
371 // Iterative process to register clusters to the seed.
372 // In iteration 0 we try only one pad-row and if quality not
373 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
378 if(!fReconstructor->GetRecoParam() ){
379 AliError("Seed can not be used without a valid RecoParam.");
383 AliTRDchamberTimeBin *layer = 0x0;
384 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){
385 AliTRDtrackingChamber ch(*chamber);
387 (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter"
388 << "chamber.=" << &ch
389 << "tracklet.=" << this
394 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
395 Double_t kroadz = fPadLength * .5 + 1.;
397 // initialize configuration parameters
398 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
399 Int_t niter = kZcorr ? 1 : 2;
404 for (Int_t iter = 0; iter < niter; iter++) {
406 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
407 if(!(layer = chamber->GetTB(iTime))) continue;
408 if(!Int_t(*layer)) continue;
410 // define searching configuration
411 Double_t dxlayer = layer->GetX() - fX0;
414 //Try 2 pad-rows in second iteration
416 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
417 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
418 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
420 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
421 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
423 // Get and register cluster
424 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
425 if (index < 0) continue;
426 AliTRDcluster *cl = (*layer)[index];
428 fIndexes[iTime] = layer->GetGlobalIndex(index);
429 fClusters[iTime] = cl;
430 fY[iTime] = cl->GetY();
431 fZ[iTime] = cl->GetZ();
434 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
437 // calculate length of the time bin (calibration aware)
438 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
439 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
440 if(!fClusters[iTime]) continue;
441 x[irp] = fClusters[iTime]->GetX();
446 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
448 // update X0 from the clusters (calibration/alignment aware)
449 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
450 if(!(layer = chamber->GetTB(iTime))) continue;
451 if(!layer->IsT0()) continue;
452 if(fClusters[iTime]){
453 fX0 = fClusters[iTime]->GetX();
455 } else { // we have to infere the position of the anode wire from the other clusters
456 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
457 if(!fClusters[jTime]) continue;
458 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
464 // update YZ reference point
467 // update x reference positions (calibration/alignment aware)
468 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
469 if(!fClusters[iTime]) continue;
470 fX[iTime] = fClusters[iTime]->GetX() - fX0;
473 AliTRDseed::Update();
475 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
478 tquality = GetQuality(kZcorr);
479 if(tquality < quality) break;
480 else quality = tquality;
484 if (!IsOK()) return kFALSE;
486 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
491 //____________________________________________________________________
492 Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
496 // Projective algorithm to attach clusters to seeding tracklets
502 // Detailed description
503 // 1. Collapse x coordinate for the full detector plane
504 // 2. truncated mean on y (r-phi) direction
506 // 4. truncated mean on z direction
511 if(!fReconstructor->GetRecoParam() ){
512 AliError("Seed can not be used without a valid RecoParam.");
516 const Int_t kClusterCandidates = 2 * knTimebins;
519 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
520 Double_t kroadz = fPadLength * 1.5 + 1.;
521 // correction to y for the tilting angle
522 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
525 AliTRDcluster *clusters[kClusterCandidates];
526 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
527 yres[kClusterCandidates], zres[kClusterCandidates];
528 Int_t ncl, *index = 0x0, tboundary[knTimebins];
530 // Do cluster projection
531 AliTRDchamberTimeBin *layer = 0x0;
532 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
533 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
534 if(!(layer = chamber->GetTB(iTime))) continue;
535 if(!Int_t(*layer)) continue;
537 fX[iTime] = layer->GetX() - fX0;
538 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
539 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
541 // build condition and process clusters
542 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
543 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
544 layer->GetClusters(cond, index, ncl);
545 for(Int_t ic = 0; ic<ncl; ic++){
546 AliTRDcluster *c = layer->GetCluster(index[ic]);
547 clusters[nYclusters] = c;
548 yres[nYclusters++] = c->GetY() - yexp[iTime];
549 if(nYclusters >= kClusterCandidates) {
550 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
555 tboundary[iTime] = nYclusters;
559 // Evaluate truncated mean on the y direction
560 Double_t mean, sigma;
561 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
562 // purge cluster candidates
563 Int_t nZclusters = 0;
564 for(Int_t ic = 0; ic<nYclusters; ic++){
565 if(yres[ic] - mean > 4. * sigma){
569 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
572 // Evaluate truncated mean on the z direction
573 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
574 // purge cluster candidates
575 for(Int_t ic = 0; ic<nZclusters; ic++){
576 if(zres[ic] - mean > 4. * sigma){
583 // Select only one cluster/TimeBin
584 Int_t lastCluster = 0;
586 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
587 ncl = tboundary[iTime] - lastCluster;
589 Int_t iptr = lastCluster;
591 Float_t dold = 9999.;
592 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
593 if(!clusters[ic]) continue;
594 Float_t y = yexp[iTime] - clusters[ic]->GetY();
595 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
596 Float_t d = y * y + z * z;
597 if(d > dold) continue;
602 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
603 fClusters[iTime] = clusters[iptr];
604 fY[iTime] = clusters[iptr]->GetY();
605 fZ[iTime] = clusters[iptr]->GetZ();
606 lastCluster = tboundary[iTime];
610 // number of minimum numbers of clusters expected for the tracklet
611 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
613 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
618 // update used clusters
620 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
621 if(!fClusters[iTime]) continue;
622 if((fClusters[iTime]->IsUsed())) fNUsed++;
625 if (fN2-fNUsed < kClmin){
626 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
634 //____________________________________________________________
635 void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
637 // Fill in all derived information. It has to be called after recovery from file or HLT.
638 // The primitive data are
639 // - list of clusters
640 // - detector (as the detector will be removed from clusters)
641 // - position of anode wire (fX0) - temporary
642 // - track reference position and direction
643 // - momentum of the track
644 // - time bin length [cm]
646 // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
648 fReconstructor = rec;
650 AliTRDpadPlane *pp = g.GetPadPlane(fDet);
651 fTilt = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
652 fPadLength = pp->GetLengthIPad();
653 fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
655 fN = 0; fN2 = 0; fMPads = 0.;
656 AliTRDcluster **cit = &fClusters[0];
657 for(Int_t ic = knTimebins; ic--; cit++){
660 fX[ic] = (*cit)->GetX() - fX0;
661 fY[ic] = (*cit)->GetY();
662 fZ[ic] = (*cit)->GetZ();
670 //____________________________________________________________________
671 Bool_t AliTRDseedV1::Fit(Bool_t tilt)
674 // Linear fit of the tracklet
679 // True if successful
681 // Detailed description
682 // 2. Check if tracklet crosses pad row boundary
683 // 1. Calculate residuals in the y (r-phi) direction
684 // 3. Do a Least Square Fit to the data
687 const Int_t kClmin = 8;
688 const Float_t q0 = 100.;
689 const Float_t clSigma0 = 2.E-2; //[cm]
690 const Float_t clSlopeQ = -1.19E-2; //[1/cm]
692 // get track direction
693 Double_t y0 = fYref[0];
694 Double_t dydx = fYref[1];
695 Double_t z0 = fZref[0];
696 Double_t dzdx = fZref[1];
699 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
700 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
702 // convertion factor from square to gauss distribution for sigma
703 Double_t convert = 1./TMath::Sqrt(12.);
705 // book cluster information
706 Double_t xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins], sz[knTimebins];
707 Int_t zRow[knTimebins];
711 AliTRDcluster *c=0x0, **jc = &fClusters[0];
712 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
719 if(!(c = (*jc))) continue;
720 if(!c->IsInChamber()) continue;
722 if(c->GetNPads()>4) w = .5;
723 if(c->GetNPads()>5) w = .2;
724 zRow[fN] = c->GetPadRow();
725 xc[fN] = fX0 - c->GetX();
729 // extrapolated y value for the track
730 yt = y0 - xc[fN]*dydx;
731 // extrapolated z value for the track
732 zt = z0 - xc[fN]*dzdx;
734 if(tilt) yc[fN] -= fTilt*(zc[fN] - zt);
736 // elaborate cluster error
737 Float_t qr = c->GetQ() - q0;
738 sy[fN] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0;
740 fitterY.AddPoint(&xc[fN], yc[fN]-yt, sy[fN]);
742 sz[fN] = fPadLength*convert;
743 fitterZ.AddPoint(&xc[fN], zc[fN], sz[fN]);
747 if (fN < kClmin) return kFALSE;
751 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
752 fYfit[1] = dydx-fitterY.GetFunctionParameter(1);
754 // check par row crossing
755 Int_t zN[2*AliTRDseed::knTimebins];
756 Int_t nz = AliTRDtrackerV1::Freq(fN, zRow, zN, kFALSE);
757 // more than one pad row crossing
758 if(nz>2) return kFALSE;
761 // determine z offset of the fit
763 Int_t nchanges = 0, nCross = 0;
764 if(nz==2){ // tracklet is crossing pad row
765 // Find the break time allowing one chage on pad-rows
766 // with maximal number of accepted clusters
767 Int_t padRef = zRow[0];
768 for (Int_t ic=1; ic<fN; ic++) {
769 if(zRow[ic] == padRef) continue;
772 if(zRow[ic-1] == zRow[ic]){
773 printf("ERROR in pad row change!!!\n");
776 // evaluate parameters of the crossing point
777 Float_t sx = (xc[ic-1] - xc[ic])*convert;
778 fCross[0] = .5 * (xc[ic-1] + xc[ic]);
779 fCross[2] = .5 * (zc[ic-1] + zc[ic]);
780 fCross[3] = TMath::Max(dzdx * sx, .01);
781 zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
788 // condition on nCross and reset nchanges TODO
791 if(dzdx * zslope < 0.){
792 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
794 SetBit(kRowCross, kTRUE); // mark pad row crossing
795 fitterZ.AddPoint(&fCross[0], fCross[2], fCross[3]);
797 //zc[nc] = fitterZ.GetFunctionParameter(0);
798 fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
799 fCross[0] = fX0 - fCross[0];
800 } else if(nchanges > 1){ // debug
801 AliError("N pad row crossing > 1.");
811 //___________________________________________________________________
812 void AliTRDseedV1::Print(Option_t *o) const
815 // Printing the seedstatus
818 AliInfo(Form("Det[%3d] Tilt[%+6.2f] Pad[%5.2f]", fDet, fTilt, fPadLength));
819 AliInfo(Form("Nattach[%2d] Nfit[%2d] Nuse[%2d] pads[%f]", fN, fN2, fNUsed, fMPads));
820 AliInfo(Form("x[%7.2f] y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fX0, fYfit[0], fZfit[0], fYfit[1], fZfit[1]));
821 AliInfo(Form("Ref y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fYref[0], fZref[0], fYref[1], fZref[1]))
824 if(strcmp(o, "a")!=0) return;
826 AliTRDcluster* const* jc = &fClusters[0];
827 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++, jc++) {
832 /* printf(" fSigmaY =%f\n", fSigmaY);
833 printf(" fSigmaY2=%f\n", fSigmaY2);
834 printf(" fMeanz =%f\n", fMeanz);
835 printf(" fZProb =%f\n", fZProb);
836 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);*/
838 /* printf(" fC =%f\n", fC);
839 printf(" fCC =%f\n",fCC);
840 printf(" fChi2 =%f\n", fChi2);
841 printf(" fChi2Z =%f\n", fChi2Z);*/
845 //___________________________________________________________________
846 Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
848 // Checks if current instance of the class has the same essential members
851 if(!o) return kFALSE;
852 const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
853 if(!inTracklet) return kFALSE;
855 for (Int_t i = 0; i < 2; i++){
856 if ( fYref[i] != inTracklet->GetYref(i) ) return kFALSE;
857 if ( fZref[i] != inTracklet->GetZref(i) ) return kFALSE;
860 if ( fSigmaY != inTracklet->GetSigmaY() ) return kFALSE;
861 if ( fSigmaY2 != inTracklet->GetSigmaY2() ) return kFALSE;
862 if ( fTilt != inTracklet->GetTilt() ) return kFALSE;
863 if ( fPadLength != inTracklet->GetPadLength() ) return kFALSE;
865 for (Int_t i = 0; i < knTimebins; i++){
866 if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
867 if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
868 if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
869 if ( fIndexes[i] != inTracklet->GetIndexes(i) ) return kFALSE;
870 if ( fUsable[i] != inTracklet->IsUsable(i) ) return kFALSE;
873 for (Int_t i=0; i < 2; i++){
874 if ( fYfit[i] != inTracklet->GetYfit(i) ) return kFALSE;
875 if ( fZfit[i] != inTracklet->GetZfit(i) ) return kFALSE;
876 if ( fYfitR[i] != inTracklet->GetYfitR(i) ) return kFALSE;
877 if ( fZfitR[i] != inTracklet->GetZfitR(i) ) return kFALSE;
878 if ( fLabels[i] != inTracklet->GetLabels(i) ) return kFALSE;
881 if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
882 if ( fZProb != inTracklet->GetZProb() ) return kFALSE;
883 if ( fN2 != inTracklet->GetN2() ) return kFALSE;
884 if ( fNUsed != inTracklet->GetNUsed() ) return kFALSE;
885 if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
886 if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
887 if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
889 if ( fC != inTracklet->GetC() ) return kFALSE;
890 if ( fCC != inTracklet->GetCC() ) return kFALSE;
891 if ( fChi2 != inTracklet->GetChi2() ) return kFALSE;
892 // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
894 if ( fDet != inTracklet->GetDetector() ) return kFALSE;
895 if ( fMom != inTracklet->GetMomentum() ) return kFALSE;
896 if ( fdX != inTracklet->GetdX() ) return kFALSE;
898 for (Int_t iCluster = 0; iCluster < knTimebins; iCluster++){
899 AliTRDcluster *curCluster = fClusters[iCluster];
900 AliTRDcluster *inCluster = inTracklet->GetClusters(iCluster);
901 if (curCluster && inCluster){
902 if (! curCluster->IsEqual(inCluster) ) {
908 // if one cluster exists, and corresponding
909 // in other tracklet doesn't - return kFALSE
910 if(curCluster || inCluster) return kFALSE;