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[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){
371 AliTRDcluster *cl = c ? new AliTRDcluster(*c) : 0x0;
372 AliTRDtrackingChamber *ch = new AliTRDtrackingChamber(*chamber);
373 (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter"
374 << "chamber.=" << ch
29b87567 375 << "tracklet.=" << this
a8276d32 376 << "c.=" << cl
29b87567 377 << "\n";
378 }
379
380 Float_t tquality;
381 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
382 Double_t kroadz = fPadLength * .5 + 1.;
383
384 // initialize configuration parameters
385 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
386 Int_t niter = kZcorr ? 1 : 2;
387
388 Double_t yexp, zexp;
389 Int_t ncl = 0;
390 // start seed update
391 for (Int_t iter = 0; iter < niter; iter++) {
392 ncl = 0;
393 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
394 if(!(layer = chamber->GetTB(iTime))) continue;
395 if(!Int_t(*layer)) continue;
396
397 // define searching configuration
398 Double_t dxlayer = layer->GetX() - fX0;
399 if(c){
400 zexp = c->GetZ();
401 //Try 2 pad-rows in second iteration
402 if (iter > 0) {
403 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
404 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
405 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
406 }
407 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
408 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
409
410 // Get and register cluster
411 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
412 if (index < 0) continue;
413 AliTRDcluster *cl = (*layer)[index];
414
415 fIndexes[iTime] = layer->GetGlobalIndex(index);
416 fClusters[iTime] = cl;
417 fY[iTime] = cl->GetY();
418 fZ[iTime] = cl->GetZ();
419 ncl++;
420 }
ae4e8b84 421 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl));
29b87567 422
423 if(ncl>1){
424 // calculate length of the time bin (calibration aware)
425 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
426 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
427 if(!fClusters[iTime]) continue;
428 x[irp] = fClusters[iTime]->GetX();
429 tb[irp] = iTime;
430 irp++;
431 if(irp==2) break;
432 }
433 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
434
435 // update X0 from the clusters (calibration/alignment aware)
436 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
437 if(!(layer = chamber->GetTB(iTime))) continue;
438 if(!layer->IsT0()) continue;
439 if(fClusters[iTime]){
440 fX0 = fClusters[iTime]->GetX();
441 break;
442 } else { // we have to infere the position of the anode wire from the other clusters
443 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
444 if(!fClusters[jTime]) continue;
445 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
446 }
447 break;
448 }
449 }
450
451 // update YZ reference point
452 // TODO
453
454 // update x reference positions (calibration/alignment aware)
455 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
456 if(!fClusters[iTime]) continue;
457 fX[iTime] = fClusters[iTime]->GetX() - fX0;
458 }
459
460 AliTRDseed::Update();
461 }
ae4e8b84 462 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2));
29b87567 463
464 if(IsOK()){
465 tquality = GetQuality(kZcorr);
466 if(tquality < quality) break;
467 else quality = tquality;
468 }
469 kroadz *= 2.;
470 } // Loop: iter
471 if (!IsOK()) return kFALSE;
472
804bb02e 473 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels();
29b87567 474 UpdateUsed();
475 return kTRUE;
e4f2f73d 476}
477
478//____________________________________________________________________
eb38ed55 479Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
29b87567 480 ,Bool_t kZcorr)
e4f2f73d 481{
482 //
483 // Projective algorithm to attach clusters to seeding tracklets
484 //
485 // Parameters
486 //
487 // Output
488 //
489 // Detailed description
490 // 1. Collapse x coordinate for the full detector plane
491 // 2. truncated mean on y (r-phi) direction
492 // 3. purge clusters
493 // 4. truncated mean on z direction
494 // 5. purge clusters
495 // 6. fit tracklet
496 //
497
29b87567 498 if(!fReconstructor->GetRecoParam() ){
499 AliError("Seed can not be used without a valid RecoParam.");
500 return kFALSE;
501 }
502
503 const Int_t kClusterCandidates = 2 * knTimebins;
504
505 //define roads
506 Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y();
507 Double_t kroadz = fPadLength * 1.5 + 1.;
508 // correction to y for the tilting angle
509 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
510
511 // working variables
512 AliTRDcluster *clusters[kClusterCandidates];
513 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
514 yres[kClusterCandidates], zres[kClusterCandidates];
515 Int_t ncl, *index = 0x0, tboundary[knTimebins];
516
517 // Do cluster projection
518 AliTRDchamberTimeBin *layer = 0x0;
519 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
520 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
521 if(!(layer = chamber->GetTB(iTime))) continue;
522 if(!Int_t(*layer)) continue;
523
524 fX[iTime] = layer->GetX() - fX0;
525 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
526 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
527
528 // build condition and process clusters
529 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
530 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
531 layer->GetClusters(cond, index, ncl);
532 for(Int_t ic = 0; ic<ncl; ic++){
533 AliTRDcluster *c = layer->GetCluster(index[ic]);
534 clusters[nYclusters] = c;
535 yres[nYclusters++] = c->GetY() - yexp[iTime];
536 if(nYclusters >= kClusterCandidates) {
537 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
538 kEXIT = kTRUE;
539 break;
540 }
541 }
542 tboundary[iTime] = nYclusters;
543 if(kEXIT) break;
544 }
545
546 // Evaluate truncated mean on the y direction
547 Double_t mean, sigma;
548 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
549 // purge cluster candidates
550 Int_t nZclusters = 0;
551 for(Int_t ic = 0; ic<nYclusters; ic++){
552 if(yres[ic] - mean > 4. * sigma){
553 clusters[ic] = 0x0;
554 continue;
555 }
556 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
557 }
558
559 // Evaluate truncated mean on the z direction
560 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
561 // purge cluster candidates
562 for(Int_t ic = 0; ic<nZclusters; ic++){
563 if(zres[ic] - mean > 4. * sigma){
564 clusters[ic] = 0x0;
565 continue;
566 }
567 }
568
569
570 // Select only one cluster/TimeBin
571 Int_t lastCluster = 0;
572 fN2 = 0;
573 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
574 ncl = tboundary[iTime] - lastCluster;
575 if(!ncl) continue;
576 Int_t iptr = lastCluster;
577 if(ncl > 1){
578 Float_t dold = 9999.;
579 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
580 if(!clusters[ic]) continue;
581 Float_t y = yexp[iTime] - clusters[ic]->GetY();
582 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
583 Float_t d = y * y + z * z;
584 if(d > dold) continue;
585 dold = d;
586 iptr = ic;
587 }
588 }
589 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
590 fClusters[iTime] = clusters[iptr];
591 fY[iTime] = clusters[iptr]->GetY();
592 fZ[iTime] = clusters[iptr]->GetZ();
593 lastCluster = tboundary[iTime];
594 fN2++;
595 }
596
597 // number of minimum numbers of clusters expected for the tracklet
598 Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
e4f2f73d 599 if (fN2 < kClmin){
29b87567 600 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
e4f2f73d 601 fN2 = 0;
602 return kFALSE;
603 }
0906e73e 604
29b87567 605 // update used clusters
606 fNUsed = 0;
607 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
608 if(!fClusters[iTime]) continue;
609 if((fClusters[iTime]->IsUsed())) fNUsed++;
610 }
0906e73e 611
612 if (fN2-fNUsed < kClmin){
29b87567 613 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
0906e73e 614 fN2 = 0;
615 return kFALSE;
616 }
29b87567 617
618 return kTRUE;
e4f2f73d 619}
620
621//____________________________________________________________________
d2b9977a 622Bool_t AliTRDseedV1::Fit(Bool_t tilt)
e4f2f73d 623{
624 //
625 // Linear fit of the tracklet
626 //
627 // Parameters :
628 //
629 // Output :
630 // True if successful
631 //
632 // Detailed description
633 // 2. Check if tracklet crosses pad row boundary
634 // 1. Calculate residuals in the y (r-phi) direction
635 // 3. Do a Least Square Fit to the data
636 //
637
29b87567 638 const Int_t kClmin = 8;
ae4e8b84 639 const Float_t q0 = 100.;
640 const Float_t clSigma0 = 2.E-2; //[cm]
641 const Float_t clSlopeQ = -1.19E-2; //[1/cm]
642
643
29b87567 644 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
645 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
646
647 // convertion factor from square to gauss distribution for sigma
648 Double_t convert = 1./TMath::Sqrt(12.);
ae4e8b84 649
29b87567 650 // book cluster information
651 Double_t xc[knTimebins+1], yc[knTimebins], zc[knTimebins+1], sy[knTimebins], sz[knTimebins+1];
652 Int_t zRow[knTimebins];
653 AliTRDcluster *c = 0x0;
654 Int_t nc = 0;
655 for (Int_t ic=0; ic<kNtb; ic++) {
656 zRow[ic] = -1;
657 xc[ic] = -1.;
658 yc[ic] = 999.;
659 zc[ic] = 999.;
660 sy[ic] = 0.;
661 sz[ic] = 0.;
662 if(!(c = fClusters[ic])) continue;
663 if(!c->IsInChamber()) continue;
664 Float_t w = 1.;
665 if(c->GetNPads()>4) w = .5;
666 if(c->GetNPads()>5) w = .2;
667 zRow[nc] = c->GetPadRow();
d2b9977a 668 xc[nc] = c->GetX() - fX0;
29b87567 669 yc[nc] = c->GetY();
670 zc[nc] = c->GetZ();
ae4e8b84 671 Float_t qr = c->GetQ() - q0;
672 sy[nc] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0;
2eafa911 673 sz[nc] = fPadLength*convert;
674 fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]);
29b87567 675 nc++;
676 }
47d5d320 677 // to few clusters
29b87567 678 if (nc < kClmin) return kFALSE;
679
e4f2f73d 680
29b87567 681 Int_t zN[2*35];
47d5d320 682 Int_t nz = AliTRDtrackerV1::Freq(nc, zRow, zN, kFALSE);
29b87567 683 // more than one pad row crossing
684 if(nz>2) return kFALSE;
685
686 // estimate reference parameter at average x
687 Double_t y0 = fYref[0];
688 Double_t dydx = fYref[1];
689 Double_t dzdx = fZref[1];
690 zc[nc] = fZref[0];
691
692 // determine z offset of the fit
693 Int_t nchanges = 0, nCross = 0;
694 if(nz==2){ // tracklet is crossing pad row
695 // Find the break time allowing one chage on pad-rows
696 // with maximal number of accepted clusters
697 Int_t padRef = zRow[0];
698 for (Int_t ic=1; ic<nc; ic++) {
699 if(zRow[ic] == padRef) continue;
700
701 // debug
702 if(zRow[ic-1] == zRow[ic]){
703 printf("ERROR in pad row change!!!\n");
704 }
705
706 // evaluate parameters of the crossing point
707 Float_t sx = (xc[ic-1] - xc[ic])*convert;
708 xc[nc] = .5 * (xc[ic-1] + xc[ic]);
709 zc[nc] = .5 * (zc[ic-1] + zc[ic]);
710 sz[nc] = TMath::Max(dzdx * sx, .01);
711 dzdx = zc[ic-1] > zc[ic] ? 1. : -1.;
712 padRef = zRow[ic];
713 nCross = ic;
714 nchanges++;
715 }
716 }
717
718 // condition on nCross and reset nchanges TODO
719
720 if(nchanges==1){
721 if(dzdx * fZref[1] < 0.){
722 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
723 }
724 SetBit(kRowCross, kTRUE); // mark pad row crossing
725 fCross[0] = xc[nc]; fCross[2] = zc[nc]; fCross[3] = sz[nc];
726 fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]);
727 fitterZ.Eval();
728 dzdx = fZref[1]; // we don't trust Parameter[1] ??;
729 zc[nc] = fitterZ.GetFunctionParameter(0);
730 } else if(nchanges > 1){ // debug
731 AliInfo("ERROR in n changes!!!");
732 return kFALSE;
733 }
734
735
736 // estimate deviation from reference direction
737 dzdx *= fTilt;
738 for (Int_t ic=0; ic<nc; ic++) {
d2b9977a 739 yc[ic] -= (y0 + xc[ic]*dydx);
740 if(tilt) yc[ic] -= (xc[ic]*dzdx + fTilt * (zc[ic] - zc[nc]));
29b87567 741 fitterY.AddPoint(&xc[ic], yc[ic], sy[ic]);
742 }
743 fitterY.Eval();
744 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
745 fYfit[1] = dydx+fitterY.GetFunctionParameter(1);
d2b9977a 746
29b87567 747 if(nchanges) fCross[1] = fYfit[0] + fCross[0] * fYfit[1];
e4f2f73d 748
47d5d320 749// printf("\nnz = %d\n", nz);
750// for(int ic=0; ic<35; ic++) printf("%d row[%d]\n", ic, zRow[ic]);
751//
752// for(int ic=0; ic<nz; ic++) printf("%d n[%d]\n", ic, zN[ic]);
e4f2f73d 753
29b87567 754 return kTRUE;
e4f2f73d 755}
756
47d5d320 757//___________________________________________________________________
758void AliTRDseedV1::Draw(Option_t*)
759{
760}
e4f2f73d 761
762//___________________________________________________________________
47d5d320 763void AliTRDseedV1::Print(Option_t*) const
e4f2f73d 764{
765 //
766 // Printing the seedstatus
767 //
768
29b87567 769 printf("Seed status :\n");
770 printf(" fTilt = %f\n", fTilt);
771 printf(" fPadLength = %f\n", fPadLength);
772 printf(" fX0 = %f\n", fX0);
773 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++) {
e4f2f73d 774 const Char_t *isUsable = fUsable[ic]?"Yes":"No";
29b87567 775 printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%p] usable[%s]\n"
e4f2f73d 776 , ic
777 , fX[ic]
778 , fY[ic]
779 , fZ[ic]
780 , fIndexes[ic]
0906e73e 781 , ((void*) fClusters[ic])
e4f2f73d 782 , isUsable);
783 }
784
29b87567 785 printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]);
786 printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]);
787 printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]);
788 printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]);
789 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
790 printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]);
791 printf(" fSigmaY =%f\n", fSigmaY);
792 printf(" fSigmaY2=%f\n", fSigmaY2);
793 printf(" fMeanz =%f\n", fMeanz);
794 printf(" fZProb =%f\n", fZProb);
795 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
796 printf(" fN =%d\n", fN);
797 printf(" fN2 =%d (>8 isOK)\n",fN2);
798 printf(" fNUsed =%d\n", fNUsed);
799 printf(" fFreq =%d\n", fFreq);
800 printf(" fNChange=%d\n", fNChange);
801 printf(" fMPads =%f\n", fMPads);
802
803 printf(" fC =%f\n", fC);
804 printf(" fCC =%f\n",fCC);
805 printf(" fChi2 =%f\n", fChi2);
806 printf(" fChi2Z =%f\n", fChi2Z);
e4f2f73d 807}
47d5d320 808