propagate modifications from time container to the tracklet debug stream
[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){
e8037fda 371 AliTRDtrackingChamber ch(*chamber);
372 ch.SetOwner();
a8276d32 373 (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter"
e8037fda 374 << "chamber.=" << &ch
29b87567 375 << "tracklet.=" << this
29b87567 376 << "\n";
377 }
378
35c24814 379 Float_t tquality;
29b87567 380 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
381 Double_t kroadz = fPadLength * .5 + 1.;
35c24814 382
383 // initialize configuration parameters
384 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
385 Int_t niter = kZcorr ? 1 : 2;
386
29b87567 387 Double_t yexp, zexp;
388 Int_t ncl = 0;
35c24814 389 // start seed update
390 for (Int_t iter = 0; iter < niter; iter++) {
29b87567 391 ncl = 0;
392 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
393 if(!(layer = chamber->GetTB(iTime))) continue;
394 if(!Int_t(*layer)) continue;
395
396 // define searching configuration
397 Double_t dxlayer = layer->GetX() - fX0;
398 if(c){
399 zexp = c->GetZ();
400 //Try 2 pad-rows in second iteration
401 if (iter > 0) {
402 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
403 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
404 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
405 }
406 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
35c24814 407 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
29b87567 408
409 // Get and register cluster
410 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
411 if (index < 0) continue;
412 AliTRDcluster *cl = (*layer)[index];
35c24814 413
29b87567 414 fIndexes[iTime] = layer->GetGlobalIndex(index);
415 fClusters[iTime] = cl;
416 fY[iTime] = cl->GetY();
417 fZ[iTime] = cl->GetZ();
418 ncl++;
419 }
35c24814 420 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
29b87567 421
422 if(ncl>1){
423 // calculate length of the time bin (calibration aware)
424 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
425 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
426 if(!fClusters[iTime]) continue;
427 x[irp] = fClusters[iTime]->GetX();
428 tb[irp] = iTime;
429 irp++;
430 if(irp==2) break;
431 }
432 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
433
434 // update X0 from the clusters (calibration/alignment aware)
435 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
436 if(!(layer = chamber->GetTB(iTime))) continue;
437 if(!layer->IsT0()) continue;
438 if(fClusters[iTime]){
439 fX0 = fClusters[iTime]->GetX();
440 break;
441 } else { // we have to infere the position of the anode wire from the other clusters
442 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
443 if(!fClusters[jTime]) continue;
444 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
445 }
446 break;
447 }
448 }
449
450 // update YZ reference point
451 // TODO
452
453 // update x reference positions (calibration/alignment aware)
454 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
455 if(!fClusters[iTime]) continue;
456 fX[iTime] = fClusters[iTime]->GetX() - fX0;
457 }
458
459 AliTRDseed::Update();
460 }
35c24814 461 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
29b87567 462
463 if(IsOK()){
464 tquality = GetQuality(kZcorr);
465 if(tquality < quality) break;
466 else quality = tquality;
467 }
468 kroadz *= 2.;
469 } // Loop: iter
470 if (!IsOK()) return kFALSE;
471
804bb02e 472 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
29b87567 473 UpdateUsed();
474 return kTRUE;
e4f2f73d 475}
476
477//____________________________________________________________________
eb38ed55 478Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
29b87567 479 ,Bool_t kZcorr)
e4f2f73d 480{
481 //
482 // Projective algorithm to attach clusters to seeding tracklets
483 //
484 // Parameters
485 //
486 // Output
487 //
488 // Detailed description
489 // 1. Collapse x coordinate for the full detector plane
490 // 2. truncated mean on y (r-phi) direction
491 // 3. purge clusters
492 // 4. truncated mean on z direction
493 // 5. purge clusters
494 // 6. fit tracklet
495 //
496
29b87567 497 if(!fReconstructor->GetRecoParam() ){
498 AliError("Seed can not be used without a valid RecoParam.");
499 return kFALSE;
500 }
501
502 const Int_t kClusterCandidates = 2 * knTimebins;
503
504 //define roads
505 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
506 Double_t kroadz = fPadLength * 1.5 + 1.;
507 // correction to y for the tilting angle
508 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
509
510 // working variables
511 AliTRDcluster *clusters[kClusterCandidates];
512 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
513 yres[kClusterCandidates], zres[kClusterCandidates];
514 Int_t ncl, *index = 0x0, tboundary[knTimebins];
515
516 // Do cluster projection
517 AliTRDchamberTimeBin *layer = 0x0;
518 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
519 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
520 if(!(layer = chamber->GetTB(iTime))) continue;
521 if(!Int_t(*layer)) continue;
522
523 fX[iTime] = layer->GetX() - fX0;
524 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
525 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
526
527 // build condition and process clusters
528 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
529 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
530 layer->GetClusters(cond, index, ncl);
531 for(Int_t ic = 0; ic<ncl; ic++){
532 AliTRDcluster *c = layer->GetCluster(index[ic]);
533 clusters[nYclusters] = c;
534 yres[nYclusters++] = c->GetY() - yexp[iTime];
535 if(nYclusters >= kClusterCandidates) {
536 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
537 kEXIT = kTRUE;
538 break;
539 }
540 }
541 tboundary[iTime] = nYclusters;
542 if(kEXIT) break;
543 }
544
545 // Evaluate truncated mean on the y direction
546 Double_t mean, sigma;
547 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
548 // purge cluster candidates
549 Int_t nZclusters = 0;
550 for(Int_t ic = 0; ic<nYclusters; ic++){
551 if(yres[ic] - mean > 4. * sigma){
552 clusters[ic] = 0x0;
553 continue;
554 }
555 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
556 }
557
558 // Evaluate truncated mean on the z direction
559 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
560 // purge cluster candidates
561 for(Int_t ic = 0; ic<nZclusters; ic++){
562 if(zres[ic] - mean > 4. * sigma){
563 clusters[ic] = 0x0;
564 continue;
565 }
566 }
567
568
569 // Select only one cluster/TimeBin
570 Int_t lastCluster = 0;
571 fN2 = 0;
572 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
573 ncl = tboundary[iTime] - lastCluster;
574 if(!ncl) continue;
575 Int_t iptr = lastCluster;
576 if(ncl > 1){
577 Float_t dold = 9999.;
578 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
579 if(!clusters[ic]) continue;
580 Float_t y = yexp[iTime] - clusters[ic]->GetY();
581 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
582 Float_t d = y * y + z * z;
583 if(d > dold) continue;
584 dold = d;
585 iptr = ic;
586 }
587 }
588 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
589 fClusters[iTime] = clusters[iptr];
590 fY[iTime] = clusters[iptr]->GetY();
591 fZ[iTime] = clusters[iptr]->GetZ();
592 lastCluster = tboundary[iTime];
593 fN2++;
594 }
595
596 // number of minimum numbers of clusters expected for the tracklet
597 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
e4f2f73d 598 if (fN2 < kClmin){
29b87567 599 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
e4f2f73d 600 fN2 = 0;
601 return kFALSE;
602 }
0906e73e 603
29b87567 604 // update used clusters
605 fNUsed = 0;
606 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
607 if(!fClusters[iTime]) continue;
608 if((fClusters[iTime]->IsUsed())) fNUsed++;
609 }
0906e73e 610
611 if (fN2-fNUsed < kClmin){
29b87567 612 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
0906e73e 613 fN2 = 0;
614 return kFALSE;
615 }
29b87567 616
617 return kTRUE;
e4f2f73d 618}
619
620//____________________________________________________________________
d2b9977a 621Bool_t AliTRDseedV1::Fit(Bool_t tilt)
e4f2f73d 622{
623 //
624 // Linear fit of the tracklet
625 //
626 // Parameters :
627 //
628 // Output :
629 // True if successful
630 //
631 // Detailed description
632 // 2. Check if tracklet crosses pad row boundary
633 // 1. Calculate residuals in the y (r-phi) direction
634 // 3. Do a Least Square Fit to the data
635 //
636
29b87567 637 const Int_t kClmin = 8;
ae4e8b84 638 const Float_t q0 = 100.;
639 const Float_t clSigma0 = 2.E-2; //[cm]
640 const Float_t clSlopeQ = -1.19E-2; //[1/cm]
641
2f7d6ac8 642 // get track direction
643 Double_t y0 = fYref[0];
644 Double_t dydx = fYref[1];
645 Double_t z0 = fZref[0];
646 Double_t dzdx = fZref[1];
647 Double_t yt, zt;
ae4e8b84 648
29b87567 649 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
650 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
651
652 // convertion factor from square to gauss distribution for sigma
653 Double_t convert = 1./TMath::Sqrt(12.);
ae4e8b84 654
29b87567 655 // book cluster information
2f7d6ac8 656 Double_t xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins], sz[knTimebins];
29b87567 657 Int_t zRow[knTimebins];
2f7d6ac8 658
659
660 fN = 0;
9eb2d46c 661 AliTRDcluster *c=0x0, **jc = &fClusters[0];
9eb2d46c 662 for (Int_t ic=0; ic<kNtb; ic++, ++jc) {
29b87567 663 zRow[ic] = -1;
664 xc[ic] = -1.;
665 yc[ic] = 999.;
666 zc[ic] = 999.;
667 sy[ic] = 0.;
668 sz[ic] = 0.;
9eb2d46c 669 if(!(c = (*jc))) continue;
29b87567 670 if(!c->IsInChamber()) continue;
671 Float_t w = 1.;
672 if(c->GetNPads()>4) w = .5;
673 if(c->GetNPads()>5) w = .2;
2f7d6ac8 674 zRow[fN] = c->GetPadRow();
675 xc[fN] = fX0 - c->GetX();
676 yc[fN] = c->GetY();
677 zc[fN] = c->GetZ();
678
679 // extrapolated y value for the track
680 yt = y0 - xc[fN]*dydx;
681 // extrapolated z value for the track
682 zt = z0 - xc[fN]*dzdx;
683 // tilt correction
684 if(tilt) yc[fN] -= fTilt*(zc[fN] - zt);
685
686 // elaborate cluster error
ae4e8b84 687 Float_t qr = c->GetQ() - q0;
2f7d6ac8 688 sy[fN] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0;
689
690 fitterY.AddPoint(&xc[fN], yc[fN]-yt, sy[fN]);
691
692 sz[fN] = fPadLength*convert;
693 fitterZ.AddPoint(&xc[fN], zc[fN], sz[fN]);
694 fN++;
29b87567 695 }
47d5d320 696 // to few clusters
2f7d6ac8 697 if (fN < kClmin) return kFALSE;
698
699 // fit XY plane
700 fitterY.Eval();
701 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
702 fYfit[1] = dydx-fitterY.GetFunctionParameter(1);
703
704 // check par row crossing
705 Int_t zN[2*AliTRDseed::knTimebins];
706 Int_t nz = AliTRDtrackerV1::Freq(fN, zRow, zN, kFALSE);
29b87567 707 // more than one pad row crossing
708 if(nz>2) return kFALSE;
9eb2d46c 709
29b87567 710
711 // determine z offset of the fit
2f7d6ac8 712 Float_t zslope = 0.;
29b87567 713 Int_t nchanges = 0, nCross = 0;
714 if(nz==2){ // tracklet is crossing pad row
715 // Find the break time allowing one chage on pad-rows
716 // with maximal number of accepted clusters
717 Int_t padRef = zRow[0];
2f7d6ac8 718 for (Int_t ic=1; ic<fN; ic++) {
29b87567 719 if(zRow[ic] == padRef) continue;
720
721 // debug
722 if(zRow[ic-1] == zRow[ic]){
723 printf("ERROR in pad row change!!!\n");
724 }
725
726 // evaluate parameters of the crossing point
727 Float_t sx = (xc[ic-1] - xc[ic])*convert;
2f7d6ac8 728 fCross[0] = .5 * (xc[ic-1] + xc[ic]);
729 fCross[2] = .5 * (zc[ic-1] + zc[ic]);
730 fCross[3] = TMath::Max(dzdx * sx, .01);
731 zslope = zc[ic-1] > zc[ic] ? 1. : -1.;
732 padRef = zRow[ic];
733 nCross = ic;
29b87567 734 nchanges++;
735 }
736 }
737
738 // condition on nCross and reset nchanges TODO
739
740 if(nchanges==1){
2f7d6ac8 741 if(dzdx * zslope < 0.){
29b87567 742 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
743 }
744 SetBit(kRowCross, kTRUE); // mark pad row crossing
2f7d6ac8 745 fitterZ.AddPoint(&fCross[0], fCross[2], fCross[3]);
29b87567 746 fitterZ.Eval();
2f7d6ac8 747 //zc[nc] = fitterZ.GetFunctionParameter(0);
748 fCross[1] = fYfit[0] - fCross[0] * fYfit[1];
749 fCross[0] = fX0 - fCross[0];
29b87567 750 } else if(nchanges > 1){ // debug
2389e96f 751 AliError("N pad row crossing > 1.");
29b87567 752 return kFALSE;
753 }
754
2389e96f 755 UpdateUsed();
756
29b87567 757 return kTRUE;
e4f2f73d 758}
759
e4f2f73d 760
761//___________________________________________________________________
47d5d320 762void AliTRDseedV1::Print(Option_t*) const
e4f2f73d 763{
764 //
765 // Printing the seedstatus
766 //
767
4dc4dc2e 768 AliInfo(Form("Tracklet X0[%7.2f] Det[%d]", fX0, fDet));
769 printf(" Tilt[%+6.2f] PadLength[%5.2f]\n", fTilt, fPadLength);
770 AliTRDcluster* const* jc = &fClusters[0];
771 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++, jc++) {
772 if(!(*jc)) continue;
773 printf(" %2d X[%7.2f] Y[%7.2f] Z[%7.2f] Idx[%d] c[%p] usable[%s]\n",
774 ic, (*jc)->GetX(), (*jc)->GetY(), (*jc)->GetZ(),
775 fIndexes[ic], (void*)(*jc), fUsable[ic]?"y":"n");
776 }
e4f2f73d 777
29b87567 778 printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]);
779 printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]);
780 printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]);
29b87567 781 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
29b87567 782 printf(" fSigmaY =%f\n", fSigmaY);
783 printf(" fSigmaY2=%f\n", fSigmaY2);
784 printf(" fMeanz =%f\n", fMeanz);
785 printf(" fZProb =%f\n", fZProb);
786 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
787 printf(" fN =%d\n", fN);
4dc4dc2e 788 printf(" fN2 =%d (>4 isOK - to be redesigned)\n",fN2);
29b87567 789 printf(" fNUsed =%d\n", fNUsed);
790 printf(" fFreq =%d\n", fFreq);
791 printf(" fNChange=%d\n", fNChange);
792 printf(" fMPads =%f\n", fMPads);
793
794 printf(" fC =%f\n", fC);
795 printf(" fCC =%f\n",fCC);
796 printf(" fChi2 =%f\n", fChi2);
797 printf(" fChi2Z =%f\n", fChi2Z);
e4f2f73d 798}
47d5d320 799