- fix cluster ownership problems in time bin container
[u/mrichter/AliRoot.git] / TRD / AliTRDseedV1.cxx
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e4f2f73d 1/**************************************************************************
29b87567 2* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3* *
4* Author: The ALICE Off-line Project. *
5* Contributors are mentioned in the code where appropriate. *
6* *
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 *
10* copies and that both the copyright notice and this permission notice *
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**************************************************************************/
e4f2f73d 15
16/* $Id$ */
17
18////////////////////////////////////////////////////////////////////////////
19// //
20// The TRD track seed //
21// //
22// Authors: //
23// Alex Bercuci <A.Bercuci@gsi.de> //
24// Markus Fasel <M.Fasel@gsi.de> //
25// //
26////////////////////////////////////////////////////////////////////////////
27
28#include "TMath.h"
29#include "TLinearFitter.h"
eb38ed55 30#include "TClonesArray.h" // tmp
31#include <TTreeStream.h>
e4f2f73d 32
33#include "AliLog.h"
34#include "AliMathBase.h"
35
e4f2f73d 36#include "AliTRDcluster.h"
f3d3af1b 37#include "AliTRDseedV1.h"
38#include "AliTRDtrackV1.h"
e4f2f73d 39#include "AliTRDcalibDB.h"
eb38ed55 40#include "AliTRDchamberTimeBin.h"
41#include "AliTRDtrackingChamber.h"
42#include "AliTRDtrackerV1.h"
43#include "AliTRDReconstructor.h"
e4f2f73d 44#include "AliTRDrecoParam.h"
0906e73e 45#include "Cal/AliTRDCalPID.h"
e4f2f73d 46
e4f2f73d 47ClassImp(AliTRDseedV1)
48
49//____________________________________________________________________
ae4e8b84 50AliTRDseedV1::AliTRDseedV1(Int_t det)
e4f2f73d 51 :AliTRDseed()
3a039a31 52 ,fReconstructor(0x0)
ae4e8b84 53 ,fClusterIter(0x0)
54 ,fClusterIdx(0)
55 ,fDet(det)
0906e73e 56 ,fMom(0.)
bcb6fb78 57 ,fSnp(0.)
58 ,fTgl(0.)
59 ,fdX(0.)
e4f2f73d 60{
61 //
62 // Constructor
63 //
29b87567 64 //printf("AliTRDseedV1::AliTRDseedV1()\n");
e44586fb 65
29b87567 66 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.;
67 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
e4f2f73d 68}
69
70//____________________________________________________________________
0906e73e 71AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
e4f2f73d 72 :AliTRDseed((AliTRDseed&)ref)
43d6ad34 73 ,fReconstructor(ref.fReconstructor)
ae4e8b84 74 ,fClusterIter(0x0)
75 ,fClusterIdx(0)
76 ,fDet(ref.fDet)
0906e73e 77 ,fMom(ref.fMom)
bcb6fb78 78 ,fSnp(ref.fSnp)
79 ,fTgl(ref.fTgl)
80 ,fdX(ref.fdX)
e4f2f73d 81{
82 //
83 // Copy Constructor performing a deep copy
84 //
85
29b87567 86 //printf("AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &)\n");
87 SetBit(kOwner, kFALSE);
88 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice];
89 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec];
fbb2ea06 90}
d9950a5a 91
0906e73e 92
e4f2f73d 93//____________________________________________________________________
94AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
95{
96 //
97 // Assignment Operator using the copy function
98 //
99
29b87567 100 if(this != &ref){
101 ref.Copy(*this);
102 }
103 return *this;
e4f2f73d 104
105}
106
107//____________________________________________________________________
108AliTRDseedV1::~AliTRDseedV1()
109{
110 //
111 // Destructor. The RecoParam object belongs to the underlying tracker.
112 //
113
29b87567 114 //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
e4f2f73d 115
29b87567 116 if(IsOwner())
117 for(int itb=0; itb<knTimebins; itb++){
118 if(!fClusters[itb]) continue;
119 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
120 delete fClusters[itb];
121 fClusters[itb] = 0x0;
122 }
e4f2f73d 123}
124
125//____________________________________________________________________
126void AliTRDseedV1::Copy(TObject &ref) const
127{
128 //
129 // Copy function
130 //
131
29b87567 132 //AliInfo("");
133 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
134
ae4e8b84 135 target.fClusterIter = 0x0;
136 target.fClusterIdx = 0;
137 target.fDet = fDet;
29b87567 138 target.fMom = fMom;
139 target.fSnp = fSnp;
140 target.fTgl = fTgl;
141 target.fdX = fdX;
142 target.fReconstructor = fReconstructor;
143
144 for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice];
145 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec];
146
147 AliTRDseed::Copy(target);
e4f2f73d 148}
149
0906e73e 150
151//____________________________________________________________
f3d3af1b 152Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
0906e73e 153{
154// Initialize this tracklet using the track information
155//
156// Parameters:
157// track - the TRD track used to initialize the tracklet
158//
159// Detailed description
160// The function sets the starting point and direction of the
161// tracklet according to the information from the TRD track.
162//
163// Caution
164// The TRD track has to be propagated to the beginning of the
165// chamber where the tracklet will be constructed
166//
167
29b87567 168 Double_t y, z;
169 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
170 fYref[0] = y;
171 fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp());
172 fZref[0] = z;
173 fZref[1] = track->GetTgl();
0906e73e 174
29b87567 175 //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());
176 return kTRUE;
0906e73e 177}
178
bcb6fb78 179
180//____________________________________________________________________
181void AliTRDseedV1::CookdEdx(Int_t nslices)
182{
183// Calculates average dE/dx for all slices and store them in the internal array fdEdx.
184//
185// Parameters:
186// nslices : number of slices for which dE/dx should be calculated
187// Output:
188// store results in the internal array fdEdx. This can be accessed with the method
189// AliTRDseedV1::GetdEdx()
190//
191// Detailed description
192// Calculates average dE/dx for all slices. Depending on the PID methode
193// the number of slices can be 3 (LQ) or 8(NN).
194// The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e.
195//
196// dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2))
197//
198// The following effects are included in the calculation:
199// 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
200// 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
201// 3. cluster size
202//
203
29b87567 204 Int_t nclusters[knSlices];
205 for(int i=0; i<knSlices; i++){
206 fdEdx[i] = 0.;
207 nclusters[i] = 0;
208 }
209 Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
210
211 AliTRDcluster *cluster = 0x0;
212 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
213 if(!(cluster = fClusters[ic])) continue;
214 Float_t x = cluster->GetX();
215
216 // Filter clusters for dE/dx calculation
217
218 // 1.consider calibration effects for slice determination
219 Int_t slice;
220 if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength);
221 else slice = x < fX0 ? 0 : nslices-1;
222
223 // 2. take sharing into account
224 Float_t w = cluster->IsShared() ? .5 : 1.;
225
226 // 3. take into account large clusters TODO
227 //w *= c->GetNPads() > 3 ? .8 : 1.;
228
229 //CHECK !!!
230 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
231 nclusters[slice]++;
232 } // End of loop over clusters
233
cd40b287 234 //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){
235 if(nslices == AliTRDReconstructor::kLQslices){
29b87567 236 // calculate mean charge per slice (only LQ PID)
237 for(int is=0; is<nslices; is++){
238 if(nclusters[is]) fdEdx[is] /= nclusters[is];
239 }
240 }
bcb6fb78 241}
242
b83573da 243
bcb6fb78 244//____________________________________________________________________
245Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
246{
29b87567 247 return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.;
bcb6fb78 248}
249
0906e73e 250//____________________________________________________________________
251Double_t* AliTRDseedV1::GetProbability()
252{
253// Fill probability array for tracklet from the DB.
254//
255// Parameters
256//
257// Output
258// returns pointer to the probability array and 0x0 if missing DB access
259//
260// Detailed description
261
29b87567 262
263 // retrive calibration db
0906e73e 264 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
265 if (!calibration) {
266 AliError("No access to calibration data");
267 return 0x0;
268 }
269
3a039a31 270 if (!fReconstructor) {
271 AliError("Reconstructor not set.");
4ba1d6ae 272 return 0x0;
273 }
274
0906e73e 275 // Retrieve the CDB container class with the parametric detector response
3a039a31 276 const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod());
0906e73e 277 if (!pd) {
278 AliError("No access to AliTRDCalPID object");
279 return 0x0;
280 }
29b87567 281 //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName()));
10f75631 282
29b87567 283 // calculate tracklet length TO DO
0906e73e 284 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
285 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
286
287 //calculate dE/dx
3a039a31 288 CookdEdx(fReconstructor->GetNdEdxSlices());
0906e73e 289
290 // Sets the a priori probabilities
291 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
ae4e8b84 292 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane());
0906e73e 293 }
294
29b87567 295 return &fProb[0];
0906e73e 296}
297
298//____________________________________________________________________
e4f2f73d 299Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
300{
301 //
302 // Returns a quality measurement of the current seed
303 //
304
29b87567 305 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
306 return
307 .5 * TMath::Abs(18.0 - fN2)
308 + 10.* TMath::Abs(fYfit[1] - fYref[1])
309 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
310 + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength;
e4f2f73d 311}
312
313//____________________________________________________________________
0906e73e 314void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const
315{
316// Computes covariance in the y-z plane at radial point x
317
29b87567 318 Int_t ic = 0; while (!fClusters[ic]) ic++;
eb38ed55 319 AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance();
29b87567 320 Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1);
eb38ed55 321
29b87567 322 Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB);
323 Double_t sz2 = fPadLength/12.;
0906e73e 324
eb38ed55 325
29b87567 326 //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2);
0906e73e 327
29b87567 328 cov[0] = sy2;
329 cov[1] = fTilt*(sy2-sz2);
330 cov[2] = sz2;
3a039a31 331
332 // insert systematic uncertainties calibration and misalignment
333 Double_t sys[15];
334 fReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
335 cov[0] += (sys[0]*sys[0]);
336 cov[2] += (sys[1]*sys[1]);
0906e73e 337}
338
0906e73e 339
340//____________________________________________________________________
29b87567 341void AliTRDseedV1::SetOwner()
0906e73e 342{
29b87567 343 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
344
345 if(TestBit(kOwner)) return;
346 for(int ic=0; ic<knTimebins; ic++){
347 if(!fClusters[ic]) continue;
348 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
349 }
350 SetBit(kOwner);
0906e73e 351}
352
353//____________________________________________________________________
eb38ed55 354Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
e4f2f73d 355{
356 //
357 // Iterative process to register clusters to the seed.
358 // In iteration 0 we try only one pad-row and if quality not
359 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
360 //
29b87567 361 // debug level 7
362 //
363
364 if(!fReconstructor->GetRecoParam() ){
365 AliError("Seed can not be used without a valid RecoParam.");
366 return kFALSE;
367 }
368
369 AliTRDchamberTimeBin *layer = 0x0;
a8276d32 370 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){
a8276d32 371 AliTRDtrackingChamber *ch = new AliTRDtrackingChamber(*chamber);
372 (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter"
373 << "chamber.=" << ch
29b87567 374 << "tracklet.=" << this
29b87567 375 << "\n";
376 }
377
35c24814 378 Float_t tquality;
29b87567 379 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
380 Double_t kroadz = fPadLength * .5 + 1.;
35c24814 381
382 // initialize configuration parameters
383 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
384 Int_t niter = kZcorr ? 1 : 2;
385
29b87567 386 Double_t yexp, zexp;
387 Int_t ncl = 0;
35c24814 388 // start seed update
389 for (Int_t iter = 0; iter < niter; iter++) {
29b87567 390 ncl = 0;
391 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
392 if(!(layer = chamber->GetTB(iTime))) continue;
393 if(!Int_t(*layer)) continue;
394
395 // define searching configuration
396 Double_t dxlayer = layer->GetX() - fX0;
397 if(c){
398 zexp = c->GetZ();
399 //Try 2 pad-rows in second iteration
400 if (iter > 0) {
401 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
402 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
403 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
404 }
405 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
35c24814 406 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
29b87567 407
408 // Get and register cluster
409 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
410 if (index < 0) continue;
411 AliTRDcluster *cl = (*layer)[index];
35c24814 412
29b87567 413 fIndexes[iTime] = layer->GetGlobalIndex(index);
414 fClusters[iTime] = cl;
415 fY[iTime] = cl->GetY();
416 fZ[iTime] = cl->GetZ();
417 ncl++;
418 }
35c24814 419 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
29b87567 420
421 if(ncl>1){
422 // calculate length of the time bin (calibration aware)
423 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
424 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
425 if(!fClusters[iTime]) continue;
426 x[irp] = fClusters[iTime]->GetX();
427 tb[irp] = iTime;
428 irp++;
429 if(irp==2) break;
430 }
431 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
432
433 // update X0 from the clusters (calibration/alignment aware)
434 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
435 if(!(layer = chamber->GetTB(iTime))) continue;
436 if(!layer->IsT0()) continue;
437 if(fClusters[iTime]){
438 fX0 = fClusters[iTime]->GetX();
439 break;
440 } else { // we have to infere the position of the anode wire from the other clusters
441 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
442 if(!fClusters[jTime]) continue;
443 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
444 }
445 break;
446 }
447 }
448
449 // update YZ reference point
450 // TODO
451
452 // update x reference positions (calibration/alignment aware)
453 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
454 if(!fClusters[iTime]) continue;
455 fX[iTime] = fClusters[iTime]->GetX() - fX0;
456 }
457
458 AliTRDseed::Update();
459 }
35c24814 460 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
29b87567 461
462 if(IsOK()){
463 tquality = GetQuality(kZcorr);
464 if(tquality < quality) break;
465 else quality = tquality;
466 }
467 kroadz *= 2.;
468 } // Loop: iter
469 if (!IsOK()) return kFALSE;
470
804bb02e 471 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
29b87567 472 UpdateUsed();
473 return kTRUE;
e4f2f73d 474}
475
476//____________________________________________________________________
eb38ed55 477Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
29b87567 478 ,Bool_t kZcorr)
e4f2f73d 479{
480 //
481 // Projective algorithm to attach clusters to seeding tracklets
482 //
483 // Parameters
484 //
485 // Output
486 //
487 // Detailed description
488 // 1. Collapse x coordinate for the full detector plane
489 // 2. truncated mean on y (r-phi) direction
490 // 3. purge clusters
491 // 4. truncated mean on z direction
492 // 5. purge clusters
493 // 6. fit tracklet
494 //
495
29b87567 496 if(!fReconstructor->GetRecoParam() ){
497 AliError("Seed can not be used without a valid RecoParam.");
498 return kFALSE;
499 }
500
501 const Int_t kClusterCandidates = 2 * knTimebins;
502
503 //define roads
504 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
505 Double_t kroadz = fPadLength * 1.5 + 1.;
506 // correction to y for the tilting angle
507 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
508
509 // working variables
510 AliTRDcluster *clusters[kClusterCandidates];
511 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
512 yres[kClusterCandidates], zres[kClusterCandidates];
513 Int_t ncl, *index = 0x0, tboundary[knTimebins];
514
515 // Do cluster projection
516 AliTRDchamberTimeBin *layer = 0x0;
517 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
518 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
519 if(!(layer = chamber->GetTB(iTime))) continue;
520 if(!Int_t(*layer)) continue;
521
522 fX[iTime] = layer->GetX() - fX0;
523 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
524 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
525
526 // build condition and process clusters
527 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
528 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
529 layer->GetClusters(cond, index, ncl);
530 for(Int_t ic = 0; ic<ncl; ic++){
531 AliTRDcluster *c = layer->GetCluster(index[ic]);
532 clusters[nYclusters] = c;
533 yres[nYclusters++] = c->GetY() - yexp[iTime];
534 if(nYclusters >= kClusterCandidates) {
535 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
536 kEXIT = kTRUE;
537 break;
538 }
539 }
540 tboundary[iTime] = nYclusters;
541 if(kEXIT) break;
542 }
543
544 // Evaluate truncated mean on the y direction
545 Double_t mean, sigma;
546 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
547 // purge cluster candidates
548 Int_t nZclusters = 0;
549 for(Int_t ic = 0; ic<nYclusters; ic++){
550 if(yres[ic] - mean > 4. * sigma){
551 clusters[ic] = 0x0;
552 continue;
553 }
554 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
555 }
556
557 // Evaluate truncated mean on the z direction
558 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
559 // purge cluster candidates
560 for(Int_t ic = 0; ic<nZclusters; ic++){
561 if(zres[ic] - mean > 4. * sigma){
562 clusters[ic] = 0x0;
563 continue;
564 }
565 }
566
567
568 // Select only one cluster/TimeBin
569 Int_t lastCluster = 0;
570 fN2 = 0;
571 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
572 ncl = tboundary[iTime] - lastCluster;
573 if(!ncl) continue;
574 Int_t iptr = lastCluster;
575 if(ncl > 1){
576 Float_t dold = 9999.;
577 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
578 if(!clusters[ic]) continue;
579 Float_t y = yexp[iTime] - clusters[ic]->GetY();
580 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
581 Float_t d = y * y + z * z;
582 if(d > dold) continue;
583 dold = d;
584 iptr = ic;
585 }
586 }
587 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
588 fClusters[iTime] = clusters[iptr];
589 fY[iTime] = clusters[iptr]->GetY();
590 fZ[iTime] = clusters[iptr]->GetZ();
591 lastCluster = tboundary[iTime];
592 fN2++;
593 }
594
595 // number of minimum numbers of clusters expected for the tracklet
596 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
e4f2f73d 597 if (fN2 < kClmin){
29b87567 598 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
e4f2f73d 599 fN2 = 0;
600 return kFALSE;
601 }
0906e73e 602
29b87567 603 // update used clusters
604 fNUsed = 0;
605 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
606 if(!fClusters[iTime]) continue;
607 if((fClusters[iTime]->IsUsed())) fNUsed++;
608 }
0906e73e 609
610 if (fN2-fNUsed < kClmin){
29b87567 611 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
0906e73e 612 fN2 = 0;
613 return kFALSE;
614 }
29b87567 615
616 return kTRUE;
e4f2f73d 617}
618
619//____________________________________________________________________
d2b9977a 620Bool_t AliTRDseedV1::Fit(Bool_t tilt)
e4f2f73d 621{
622 //
623 // Linear fit of the tracklet
624 //
625 // Parameters :
626 //
627 // Output :
628 // True if successful
629 //
630 // Detailed description
631 // 2. Check if tracklet crosses pad row boundary
632 // 1. Calculate residuals in the y (r-phi) direction
633 // 3. Do a Least Square Fit to the data
634 //
635
29b87567 636 const Int_t kClmin = 8;
ae4e8b84 637 const Float_t q0 = 100.;
638 const Float_t clSigma0 = 2.E-2; //[cm]
639 const Float_t clSlopeQ = -1.19E-2; //[1/cm]
640
2f7d6ac8 641 // get track direction
642 Double_t y0 = fYref[0];
643 Double_t dydx = fYref[1];
644 Double_t z0 = fZref[0];
645 Double_t dzdx = fZref[1];
646 Double_t yt, zt;
ae4e8b84 647
29b87567 648 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
649 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
650
651 // convertion factor from square to gauss distribution for sigma
652 Double_t convert = 1./TMath::Sqrt(12.);
ae4e8b84 653
29b87567 654 // book cluster information
2f7d6ac8 655 Double_t xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins], sz[knTimebins];
29b87567 656 Int_t zRow[knTimebins];
2f7d6ac8 657
658
659 fN = 0;
9eb2d46c 660 AliTRDcluster *c=0x0, **jc = &fClusters[0];
9eb2d46c 661 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
29b87567 662 zRow[ic] = -1;
663 xc[ic] = -1.;
664 yc[ic] = 999.;
665 zc[ic] = 999.;
666 sy[ic] = 0.;
667 sz[ic] = 0.;
9eb2d46c 668 if(!(c = (*jc))) continue;
29b87567 669 if(!c->IsInChamber()) continue;
670 Float_t w = 1.;
671 if(c->GetNPads()>4) w = .5;
672 if(c->GetNPads()>5) w = .2;
2f7d6ac8 673 zRow[fN] = c->GetPadRow();
674 xc[fN] = fX0 - c->GetX();
675 yc[fN] = c->GetY();
676 zc[fN] = c->GetZ();
677
678 // extrapolated y value for the track
679 yt = y0 - xc[fN]*dydx;
680 // extrapolated z value for the track
681 zt = z0 - xc[fN]*dzdx;
682 // tilt correction
683 if(tilt) yc[fN] -= fTilt*(zc[fN] - zt);
684
685 // elaborate cluster error
ae4e8b84 686 Float_t qr = c->GetQ() - q0;
2f7d6ac8 687 sy[fN] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0;
688
689 fitterY.AddPoint(&xc[fN], yc[fN]-yt, sy[fN]);
690
691 sz[fN] = fPadLength*convert;
692 fitterZ.AddPoint(&xc[fN], zc[fN], sz[fN]);
693 fN++;
29b87567 694 }
47d5d320 695 // to few clusters
2f7d6ac8 696 if (fN < kClmin) return kFALSE;
697
698 // fit XY plane
699 fitterY.Eval();
700 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
701 fYfit[1] = dydx-fitterY.GetFunctionParameter(1);
702
703 // check par row crossing
704 Int_t zN[2*AliTRDseed::knTimebins];
705 Int_t nz = AliTRDtrackerV1::Freq(fN, zRow, zN, kFALSE);
29b87567 706 // more than one pad row crossing
707 if(nz>2) return kFALSE;
9eb2d46c 708
29b87567 709
710 // determine z offset of the fit
2f7d6ac8 711 Float_t zslope = 0.;
29b87567 712 Int_t nchanges = 0, nCross = 0;
713 if(nz==2){ // tracklet is crossing pad row
714 // Find the break time allowing one chage on pad-rows
715 // with maximal number of accepted clusters
716 Int_t padRef = zRow[0];
2f7d6ac8 717 for (Int_t ic=1; ic<fN; ic++) {
29b87567 718 if(zRow[ic] == padRef) continue;
719
720 // debug
721 if(zRow[ic-1] == zRow[ic]){
722 printf("ERROR in pad row change!!!\n");
723 }
724
725 // evaluate parameters of the crossing point
726 Float_t sx = (xc[ic-1] - xc[ic])*convert;
2f7d6ac8 727 fCross[0] = .5 * (xc[ic-1] + xc[ic]);
728 fCross[2] = .5 * (zc[ic-1] + zc[ic]);
729 fCross[3] = TMath::Max(dzdx * sx, .01);
730 zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
731 padRef = zRow[ic];
732 nCross = ic;
29b87567 733 nchanges++;
734 }
735 }
736
737 // condition on nCross and reset nchanges TODO
738
739 if(nchanges==1){
2f7d6ac8 740 if(dzdx * zslope < 0.){
29b87567 741 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
742 }
743 SetBit(kRowCross, kTRUE); // mark pad row crossing
2f7d6ac8 744 fitterZ.AddPoint(&fCross[0], fCross[2], fCross[3]);
29b87567 745 fitterZ.Eval();
2f7d6ac8 746 //zc[nc] = fitterZ.GetFunctionParameter(0);
747 fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
748 fCross[0] = fX0 - fCross[0];
29b87567 749 } else if(nchanges > 1){ // debug
2389e96f 750 AliError("N pad row crossing > 1.");
29b87567 751 return kFALSE;
752 }
753
2389e96f 754 UpdateUsed();
755
29b87567 756 return kTRUE;
e4f2f73d 757}
758
e4f2f73d 759
760//___________________________________________________________________
47d5d320 761void AliTRDseedV1::Print(Option_t*) const
e4f2f73d 762{
763 //
764 // Printing the seedstatus
765 //
766
4dc4dc2e 767 AliInfo(Form("Tracklet X0[%7.2f] Det[%d]", fX0, fDet));
768 printf(" Tilt[%+6.2f] PadLength[%5.2f]\n", fTilt, fPadLength);
769 AliTRDcluster* const* jc = &fClusters[0];
770 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++, jc++) {
771 if(!(*jc)) continue;
772 printf(" %2d X[%7.2f] Y[%7.2f] Z[%7.2f] Idx[%d] c[%p] usable[%s]\n",
773 ic, (*jc)->GetX(), (*jc)->GetY(), (*jc)->GetZ(),
774 fIndexes[ic], (void*)(*jc), fUsable[ic]?"y":"n");
775 }
e4f2f73d 776
29b87567 777 printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]);
778 printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]);
779 printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]);
29b87567 780 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
29b87567 781 printf(" fSigmaY =%f\n", fSigmaY);
782 printf(" fSigmaY2=%f\n", fSigmaY2);
783 printf(" fMeanz =%f\n", fMeanz);
784 printf(" fZProb =%f\n", fZProb);
785 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
786 printf(" fN =%d\n", fN);
4dc4dc2e 787 printf(" fN2 =%d (>4 isOK - to be redesigned)\n",fN2);
29b87567 788 printf(" fNUsed =%d\n", fNUsed);
789 printf(" fFreq =%d\n", fFreq);
790 printf(" fNChange=%d\n", fNChange);
791 printf(" fMPads =%f\n", fMPads);
792
793 printf(" fC =%f\n", fC);
794 printf(" fCC =%f\n",fCC);
795 printf(" fChi2 =%f\n", fChi2);
796 printf(" fChi2Z =%f\n", fChi2Z);
e4f2f73d 797}
47d5d320 798