Bug fix in PID object definition
[u/mrichter/AliRoot.git] / TRD / AliTRDseedV1.cxx
CommitLineData
e4f2f73d 1/**************************************************************************
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 **************************************************************************/
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
36#include "AliTRDseedV1.h"
37#include "AliTRDcluster.h"
0906e73e 38#include "AliTRDtrack.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 "AliTRDgeometry.h"
46#include "Cal/AliTRDCalPID.h"
e4f2f73d 47
e4f2f73d 48ClassImp(AliTRDseedV1)
49
50//____________________________________________________________________
eb38ed55 51AliTRDseedV1::AliTRDseedV1(Int_t plane)
e4f2f73d 52 :AliTRDseed()
eb38ed55 53 ,fPlane(plane)
0906e73e 54 ,fMom(0.)
bcb6fb78 55 ,fSnp(0.)
56 ,fTgl(0.)
57 ,fdX(0.)
e4f2f73d 58{
59 //
60 // Constructor
61 //
0906e73e 62 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.;
0906e73e 63 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
e4f2f73d 64}
65
66//____________________________________________________________________
0906e73e 67AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
e4f2f73d 68 :AliTRDseed((AliTRDseed&)ref)
0906e73e 69 ,fPlane(ref.fPlane)
0906e73e 70 ,fMom(ref.fMom)
bcb6fb78 71 ,fSnp(ref.fSnp)
72 ,fTgl(ref.fTgl)
73 ,fdX(ref.fdX)
e4f2f73d 74{
75 //
76 // Copy Constructor performing a deep copy
77 //
78
79 //AliInfo("");
0906e73e 80 for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice];
0906e73e 81 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec];
fbb2ea06 82}
d9950a5a 83
0906e73e 84
e4f2f73d 85//____________________________________________________________________
86AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
87{
88 //
89 // Assignment Operator using the copy function
90 //
91
92 //AliInfo("");
93 if(this != &ref){
94 ref.Copy(*this);
95 }
96 return *this;
97
98}
99
100//____________________________________________________________________
101AliTRDseedV1::~AliTRDseedV1()
102{
103 //
104 // Destructor. The RecoParam object belongs to the underlying tracker.
105 //
106
107 //AliInfo(Form("fOwner[%s]", fOwner?"YES":"NO"));
108
47d5d320 109 if(IsOwner())
0906e73e 110 for(int itb=0; itb<knTimebins; itb++){
111 if(!fClusters[itb]) continue;
112 //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
113 delete fClusters[itb];
114 fClusters[itb] = 0x0;
115 }
e4f2f73d 116}
117
118//____________________________________________________________________
119void AliTRDseedV1::Copy(TObject &ref) const
120{
121 //
122 // Copy function
123 //
124
125 //AliInfo("");
126 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
127
0906e73e 128 target.fPlane = fPlane;
129 target.fMom = fMom;
bcb6fb78 130 target.fSnp = fSnp;
131 target.fTgl = fTgl;
132 target.fdX = fdX;
0906e73e 133
134 for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice];
0906e73e 135 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec];
136
e4f2f73d 137 AliTRDseed::Copy(target);
138}
139
0906e73e 140
141//____________________________________________________________
142void AliTRDseedV1::Init(AliTRDtrack *track)
143{
144// Initialize this tracklet using the track information
145//
146// Parameters:
147// track - the TRD track used to initialize the tracklet
148//
149// Detailed description
150// The function sets the starting point and direction of the
151// tracklet according to the information from the TRD track.
152//
153// Caution
154// The TRD track has to be propagated to the beginning of the
155// chamber where the tracklet will be constructed
156//
157
158 Double_t y, z;
159 track->GetProlongation(fX0, y, z);
160 fYref[0] = y;
33f721e9 161 fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp());
0906e73e 162 fZref[0] = z;
33f721e9 163 fZref[1] = track->GetTgl();
0906e73e 164
165 //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());
166}
167
bcb6fb78 168
169//____________________________________________________________________
170void AliTRDseedV1::CookdEdx(Int_t nslices)
171{
172// Calculates average dE/dx for all slices and store them in the internal array fdEdx.
173//
174// Parameters:
175// nslices : number of slices for which dE/dx should be calculated
176// Output:
177// store results in the internal array fdEdx. This can be accessed with the method
178// AliTRDseedV1::GetdEdx()
179//
180// Detailed description
181// Calculates average dE/dx for all slices. Depending on the PID methode
182// the number of slices can be 3 (LQ) or 8(NN).
183// The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e.
184//
185// dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2))
186//
187// The following effects are included in the calculation:
188// 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
189// 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
190// 3. cluster size
191//
192
193 Int_t nclusters[knSlices];
194 for(int i=0; i<knSlices; i++){
195 fdEdx[i] = 0.;
196 nclusters[i] = 0;
197 }
198 Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
199
200 AliTRDcluster *cluster = 0x0;
2985ffcb 201 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
bcb6fb78 202 if(!(cluster = fClusters[ic])) continue;
203 Float_t x = cluster->GetX();
204
205 // Filter clusters for dE/dx calculation
206
207 // 1.consider calibration effects for slice determination
208 Int_t slice;
209 if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength);
210 else slice = x < fX0 ? 0 : nslices-1;
211
212 // 2. take sharing into account
213 Float_t w = cluster->IsShared() ? .5 : 1.;
214
215 // 3. take into account large clusters TODO
216 //w *= c->GetNPads() > 3 ? .8 : 1.;
217
218 //CHECK !!!
219 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
220 nclusters[slice]++;
221 } // End of loop over clusters
222
223 // calculate mean charge per slice
10f75631 224 for(int is=0; is<nslices; is++){
225 if(nclusters[is]) fdEdx[is] /= nclusters[is];
226 }
bcb6fb78 227}
228
229//____________________________________________________________________
230Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
231{
10f75631 232 return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.;
bcb6fb78 233}
234
0906e73e 235//____________________________________________________________________
236Double_t* AliTRDseedV1::GetProbability()
237{
238// Fill probability array for tracklet from the DB.
239//
240// Parameters
241//
242// Output
243// returns pointer to the probability array and 0x0 if missing DB access
244//
245// Detailed description
246
247
248 // retrive calibration db
249 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
250 if (!calibration) {
251 AliError("No access to calibration data");
252 return 0x0;
253 }
254
255 // Retrieve the CDB container class with the parametric detector response
eb38ed55 256 const AliTRDCalPID *pd = calibration->GetPIDObject(AliTRDReconstructor::RecoParam()->GetPIDMethod());
0906e73e 257 if (!pd) {
258 AliError("No access to AliTRDCalPID object");
259 return 0x0;
260 }
10f75631 261 //AliInfo(Form("Method[%d] : %s", AliTRDReconstructor::RecoParam()->GetPIDMethod(), pd->IsA()->GetName()));
262
0906e73e 263 // calculate tracklet length TO DO
264 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
265 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
266
267 //calculate dE/dx
eb38ed55 268 CookdEdx(AliTRDReconstructor::RecoParam()->GetNdEdxSlices());
0906e73e 269
270 // Sets the a priori probabilities
271 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
272 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, fPlane);
273 }
274
275 return &fProb[0];
276}
277
278//____________________________________________________________________
e4f2f73d 279Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
280{
281 //
282 // Returns a quality measurement of the current seed
283 //
284
285 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
eb38ed55 286 return
287 .5 * TMath::Abs(18.0 - fN2)
e4f2f73d 288 + 10.* TMath::Abs(fYfit[1] - fYref[1])
eb38ed55 289 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
e4f2f73d 290 + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength;
291}
292
293//____________________________________________________________________
0906e73e 294void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const
295{
296// Computes covariance in the y-z plane at radial point x
297
eb38ed55 298 Int_t ic = 0; while (!fClusters[ic]) ic++;
299 AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance();
300 Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1);
301
302 Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB);
0906e73e 303 Double_t sz2 = fPadLength/12.;
304
eb38ed55 305
0906e73e 306 //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2);
307
308 cov[0] = sy2;
309 cov[1] = fTilt*(sy2-sz2);
310 cov[2] = sz2;
311}
312
0906e73e 313
314//____________________________________________________________________
315void AliTRDseedV1::SetOwner(Bool_t own)
316{
317 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
318
319 if(own){
320 for(int ic=0; ic<knTimebins; ic++){
321 if(!fClusters[ic]) continue;
322 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
323 }
47d5d320 324 SetBit(1);
0906e73e 325 } else {
47d5d320 326 if(IsOwner()){
0906e73e 327 for(int ic=0; ic<knTimebins; ic++){
328 if(!fClusters[ic]) continue;
329 delete fClusters[ic];
330 //fClusters[ic] = tracker->GetClusters(index) TODO
331 }
332 }
47d5d320 333 SetBit(1, kFALSE);
0906e73e 334 }
335}
336
337//____________________________________________________________________
eb38ed55 338Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
e4f2f73d 339{
340 //
341 // Iterative process to register clusters to the seed.
342 // In iteration 0 we try only one pad-row and if quality not
343 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
344 //
eb38ed55 345 // debug level 7
346 //
e4f2f73d 347
eb38ed55 348 if(!AliTRDReconstructor::RecoParam()){
e4f2f73d 349 AliError("Seed can not be used without a valid RecoParam.");
350 return kFALSE;
351 }
0906e73e 352
eb38ed55 353 AliTRDchamberTimeBin *layer = 0x0;
354 if(AliTRDReconstructor::StreamLevel()>=7 && c){
355 TClonesArray clusters("AliTRDcluster", 24);
356 clusters.SetOwner(kTRUE);
357 AliTRDcluster *cc = 0x0;
358 Int_t det=-1, ncl, ncls = 0;
2985ffcb 359 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 360 if(!(layer = chamber->GetTB(iTime))) continue;
361 if(!(ncl = Int_t(*layer))) continue;
362 for(int ic=0; ic<ncl; ic++){
363 cc = (*layer)[ic];
364 det = cc->GetDetector();
365 new(clusters[ncls++]) AliTRDcluster(*cc);
366 }
367 }
368 AliInfo(Form("N clusters[%d] = %d", fPlane, ncls));
369
370 Int_t ref = c ? 1 : 0;
371 TTreeSRedirector &cstreamer = *AliTRDtrackerV1::DebugStreamer();
372 cstreamer << "AttachClustersIter"
373 << "det=" << det
374 << "ref=" << ref
375 << "clusters.=" << &clusters
376 << "tracklet.=" << this
377 << "cl.=" << c
378 << "\n";
379 }
0906e73e 380
e4f2f73d 381 Float_t tquality;
eb38ed55 382 Double_t kroady = AliTRDReconstructor::RecoParam()->GetRoad1y();
e4f2f73d 383 Double_t kroadz = fPadLength * .5 + 1.;
384
385 // initialize configuration parameters
386 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
387 Int_t niter = kZcorr ? 1 : 2;
388
389 Double_t yexp, zexp;
390 Int_t ncl = 0;
391 // start seed update
392 for (Int_t iter = 0; iter < niter; iter++) {
e4f2f73d 393 ncl = 0;
2985ffcb 394 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 395 if(!(layer = chamber->GetTB(iTime))) continue;
396 if(!Int_t(*layer)) continue;
397
e4f2f73d 398 // define searching configuration
eb38ed55 399 Double_t dxlayer = layer->GetX() - fX0;
e4f2f73d 400 if(c){
401 zexp = c->GetZ();
402 //Try 2 pad-rows in second iteration
403 if (iter > 0) {
404 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
405 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
406 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
407 }
eb38ed55 408 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
e4f2f73d 409 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
bcb6fb78 410
411 // Get and register cluster
eb38ed55 412 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
e4f2f73d 413 if (index < 0) continue;
eb38ed55 414 AliTRDcluster *cl = (*layer)[index];
e4f2f73d 415
eb38ed55 416 fIndexes[iTime] = layer->GetGlobalIndex(index);
e4f2f73d 417 fClusters[iTime] = cl;
e4f2f73d 418 fY[iTime] = cl->GetY();
419 fZ[iTime] = cl->GetZ();
e4f2f73d 420 ncl++;
421 }
eb38ed55 422 if(AliTRDReconstructor::StreamLevel()>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fPlane, ncl));
bcb6fb78 423
eb38ed55 424 if(ncl>1){
bcb6fb78 425 // calculate length of the time bin (calibration aware)
426 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
2985ffcb 427 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
bcb6fb78 428 if(!fClusters[iTime]) continue;
429 x[irp] = fClusters[iTime]->GetX();
430 tb[irp] = iTime;
431 irp++;
432 if(irp==2) break;
433 }
434 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
435
436 // update X0 from the clusters (calibration/alignment aware)
2985ffcb 437 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 438 if(!(layer = chamber->GetTB(iTime))) continue;
439 if(!layer->IsT0()) continue;
bcb6fb78 440 if(fClusters[iTime]){
441 fX0 = fClusters[iTime]->GetX();
442 break;
443 } else { // we have to infere the position of the anode wire from the other clusters
2985ffcb 444 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
bcb6fb78 445 if(!fClusters[jTime]) continue;
446 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
447 }
448 break;
449 }
450 }
451
452 // update YZ reference point
453 // TODO
454
455 // update x reference positions (calibration/alignment aware)
2985ffcb 456 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
bcb6fb78 457 if(!fClusters[iTime]) continue;
458 fX[iTime] = fClusters[iTime]->GetX() - fX0;
459 }
460
461 AliTRDseed::Update();
462 }
eb38ed55 463 if(AliTRDReconstructor::StreamLevel()>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fPlane, fN2));
bcb6fb78 464
e4f2f73d 465 if(IsOK()){
466 tquality = GetQuality(kZcorr);
467 if(tquality < quality) break;
468 else quality = tquality;
469 }
470 kroadz *= 2.;
471 } // Loop: iter
472 if (!IsOK()) return kFALSE;
473
474 CookLabels();
475 UpdateUsed();
476 return kTRUE;
477}
478
479//____________________________________________________________________
eb38ed55 480Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
0906e73e 481 ,Bool_t kZcorr)
e4f2f73d 482{
483 //
484 // Projective algorithm to attach clusters to seeding tracklets
485 //
486 // Parameters
487 //
488 // Output
489 //
490 // Detailed description
491 // 1. Collapse x coordinate for the full detector plane
492 // 2. truncated mean on y (r-phi) direction
493 // 3. purge clusters
494 // 4. truncated mean on z direction
495 // 5. purge clusters
496 // 6. fit tracklet
497 //
498
eb38ed55 499 if(!AliTRDReconstructor::RecoParam()){
e4f2f73d 500 AliError("Seed can not be used without a valid RecoParam.");
501 return kFALSE;
502 }
503
0906e73e 504 const Int_t kClusterCandidates = 2 * knTimebins;
e4f2f73d 505
506 //define roads
eb38ed55 507 Double_t kroady = AliTRDReconstructor::RecoParam()->GetRoad1y();
e4f2f73d 508 Double_t kroadz = fPadLength * 1.5 + 1.;
509 // correction to y for the tilting angle
510 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
511
512 // working variables
513 AliTRDcluster *clusters[kClusterCandidates];
0906e73e 514 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
e4f2f73d 515 yres[kClusterCandidates], zres[kClusterCandidates];
0906e73e 516 Int_t ncl, *index = 0x0, tboundary[knTimebins];
e4f2f73d 517
518 // Do cluster projection
eb38ed55 519 AliTRDchamberTimeBin *layer = 0x0;
e4f2f73d 520 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
2985ffcb 521 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 522 if(!(layer = chamber->GetTB(iTime))) continue;
523 if(!Int_t(*layer)) continue;
524
525 fX[iTime] = layer->GetX() - fX0;
e4f2f73d 526 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
527 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
528
529 // build condition and process clusters
530 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
531 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
eb38ed55 532 layer->GetClusters(cond, index, ncl);
e4f2f73d 533 for(Int_t ic = 0; ic<ncl; ic++){
eb38ed55 534 AliTRDcluster *c = layer->GetCluster(index[ic]);
e4f2f73d 535 clusters[nYclusters] = c;
536 yres[nYclusters++] = c->GetY() - yexp[iTime];
537 if(nYclusters >= kClusterCandidates) {
538 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
539 kEXIT = kTRUE;
540 break;
541 }
542 }
543 tboundary[iTime] = nYclusters;
544 if(kEXIT) break;
545 }
546
547 // Evaluate truncated mean on the y direction
548 Double_t mean, sigma;
549 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
eb38ed55 550 // purge cluster candidates
e4f2f73d 551 Int_t nZclusters = 0;
552 for(Int_t ic = 0; ic<nYclusters; ic++){
553 if(yres[ic] - mean > 4. * sigma){
554 clusters[ic] = 0x0;
555 continue;
556 }
557 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
558 }
559
560 // Evaluate truncated mean on the z direction
561 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
eb38ed55 562 // purge cluster candidates
e4f2f73d 563 for(Int_t ic = 0; ic<nZclusters; ic++){
564 if(zres[ic] - mean > 4. * sigma){
565 clusters[ic] = 0x0;
566 continue;
567 }
568 }
569
570
571 // Select only one cluster/TimeBin
572 Int_t lastCluster = 0;
573 fN2 = 0;
2985ffcb 574 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
e4f2f73d 575 ncl = tboundary[iTime] - lastCluster;
576 if(!ncl) continue;
eb38ed55 577 Int_t iptr = lastCluster;
578 if(ncl > 1){
579 Float_t dold = 9999.;
e4f2f73d 580 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
581 if(!clusters[ic]) continue;
582 Float_t y = yexp[iTime] - clusters[ic]->GetY();
583 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
584 Float_t d = y * y + z * z;
585 if(d > dold) continue;
586 dold = d;
587 iptr = ic;
588 }
e4f2f73d 589 }
eb38ed55 590 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
591 fClusters[iTime] = clusters[iptr];
592 fY[iTime] = clusters[iptr]->GetY();
593 fZ[iTime] = clusters[iptr]->GetZ();
0906e73e 594 lastCluster = tboundary[iTime];
e4f2f73d 595 fN2++;
596 }
597
598 // number of minimum numbers of clusters expected for the tracklet
2985ffcb 599 Int_t kClmin = Int_t(AliTRDReconstructor::RecoParam()->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
e4f2f73d 600 if (fN2 < kClmin){
601 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
602 fN2 = 0;
603 return kFALSE;
604 }
0906e73e 605
606 // update used clusters
607 fNUsed = 0;
2985ffcb 608 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
0906e73e 609 if(!fClusters[iTime]) continue;
610 if((fClusters[iTime]->IsUsed())) fNUsed++;
611 }
612
613 if (fN2-fNUsed < kClmin){
614 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
615 fN2 = 0;
616 return kFALSE;
617 }
e4f2f73d 618
e4f2f73d 619 return kTRUE;
620}
621
622//____________________________________________________________________
0906e73e 623Bool_t AliTRDseedV1::Fit()
e4f2f73d 624{
625 //
626 // Linear fit of the tracklet
627 //
628 // Parameters :
629 //
630 // Output :
631 // True if successful
632 //
633 // Detailed description
634 // 2. Check if tracklet crosses pad row boundary
635 // 1. Calculate residuals in the y (r-phi) direction
636 // 3. Do a Least Square Fit to the data
637 //
638
47d5d320 639 const Int_t kClmin = 8;
640 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
8acca6a3 641 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
47d5d320 642
643 // convertion factor from square to gauss distribution for sigma
644 Double_t convert = 1./TMath::Sqrt(12.);
645
646 // book cluster information
8acca6a3 647 Double_t xc[knTimebins+1], yc[knTimebins], zc[knTimebins+1], sy[knTimebins], sz[knTimebins+1];
47d5d320 648 Int_t zRow[knTimebins];
649 AliTRDcluster *c = 0x0;
650 Int_t nc = 0;
651 for (Int_t ic=0; ic<kNtb; ic++) {
652 zRow[ic] = -1;
653 xc[ic] = -1.;
654 yc[ic] = 999.;
655 zc[ic] = 999.;
656 sy[ic] = 0.;
657 sz[ic] = 0.;
658 if(!(c = fClusters[ic])) continue;
659 if(!c->IsInChamber()) continue;
660 Float_t w = 1.;
661 if(c->GetNPads()>4) w = .5;
662 if(c->GetNPads()>5) w = .2;
663 zRow[nc] = c->GetPadRow();
664 xc[nc] = fX0 - c->GetX();
665 yc[nc] = c->GetY();
666 zc[nc] = c->GetZ();
667 sy[ic] = w; // all clusters have the same sigma
668 sz[ic] = fPadLength*convert;
8acca6a3 669 fitterZ.AddPoint(&xc[ic], zc[ic], sz[ic]);
47d5d320 670 nc++;
671 }
672 // to few clusters
673 if (nc < kClmin) return kFALSE;
674
e4f2f73d 675
47d5d320 676 Int_t zN[2*35];
677 Int_t nz = AliTRDtrackerV1::Freq(nc, zRow, zN, kFALSE);
678 // more than one pad row crossing
679 if(nz>2) return kFALSE;
e4f2f73d 680
47d5d320 681 // estimate reference parameter at average x
682 Double_t y0 = fYref[0];
683 Double_t dydx = fYref[1];
684 Double_t dzdx = fZref[1];
685 zc[nc] = fZref[0];
686
687 // determine z offset of the fit
688 Int_t nchanges = 0, nCross = 0;
689 if(nz==2){ // tracklet is crossing pad row
690 // Find the break time allowing one chage on pad-rows
691 // with maximal number of accepted clusters
692 Int_t padRef = zRow[0];
693 for (Int_t ic=1; ic<nc; ic++) {
694 if(zRow[ic] == padRef) continue;
695
696 // debug
697 if(zRow[ic-1] == zRow[ic]){
698 printf("ERROR in pad row change!!!\n");
699 }
700
701 // evaluate parameters of the crossing point
702 Float_t sx = (xc[ic-1] - xc[ic])*convert;
703 xc[nc] = .5 * (xc[ic-1] + xc[ic]);
704 zc[nc] = .5 * (zc[ic-1] + zc[ic]);
705 sz[nc] = TMath::Max(dzdx * sx, .01);
706 dzdx = zc[ic-1] > zc[ic] ? 1. : -1.;
707 padRef = zRow[ic];
708 nCross = ic;
709 nchanges++;
710 }
e4f2f73d 711 }
712
47d5d320 713 // condition on nCross and reset nchanges TODO
714
47d5d320 715 if(nchanges==1){
716 if(dzdx * fZref[1] < 0.){
717 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
718 }
719 SetBit(2, kTRUE); // mark pad row crossing
720 fCross[0] = xc[nc]; fCross[2] = zc[nc]; fCross[3] = sz[nc];
8acca6a3 721 fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]);
722 fitterZ.Eval();
723 dzdx = fZref[1]; // we don't trust Parameter[1] ??;
724 zc[nc] = fitterZ.GetFunctionParameter(0);
47d5d320 725 } else if(nchanges > 1){ // debug
726 AliInfo("ERROR in n changes!!!");
e4f2f73d 727 return kFALSE;
728 }
47d5d320 729
730
731 // estimate deviation from reference direction
732 dzdx *= fTilt;
733 for (Int_t ic=0; ic<nc; ic++) {
734 yc[ic] -= y0 + xc[ic]*(dydx + dzdx) + fTilt * (zc[ic] - zc[nc]);
8acca6a3 735 fitterY.AddPoint(&xc[ic], yc[ic], sy[ic]);
e4f2f73d 736 }
8acca6a3 737 fitterY.Eval();
738 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
739 fYfit[1] = dydx+fitterY.GetFunctionParameter(1);
47d5d320 740 if(nchanges) fCross[1] = fYfit[0] + fCross[0] * fYfit[1];
e4f2f73d 741
47d5d320 742// printf("\nnz = %d\n", nz);
743// for(int ic=0; ic<35; ic++) printf("%d row[%d]\n", ic, zRow[ic]);
744//
745// for(int ic=0; ic<nz; ic++) printf("%d n[%d]\n", ic, zN[ic]);
e4f2f73d 746
747 return kTRUE;
748}
749
47d5d320 750//___________________________________________________________________
751void AliTRDseedV1::Draw(Option_t*)
752{
753}
e4f2f73d 754
755//___________________________________________________________________
47d5d320 756void AliTRDseedV1::Print(Option_t*) const
e4f2f73d 757{
758 //
759 // Printing the seedstatus
760 //
761
e4f2f73d 762 printf("Seed status :\n");
763 printf(" fTilt = %f\n", fTilt);
764 printf(" fPadLength = %f\n", fPadLength);
765 printf(" fX0 = %f\n", fX0);
2985ffcb 766 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++) {
e4f2f73d 767 const Char_t *isUsable = fUsable[ic]?"Yes":"No";
0906e73e 768 printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%p] usable[%s]\n"
e4f2f73d 769 , ic
770 , fX[ic]
771 , fY[ic]
772 , fZ[ic]
773 , fIndexes[ic]
0906e73e 774 , ((void*) fClusters[ic])
e4f2f73d 775 , isUsable);
776 }
777
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]);
781 printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]);
782 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
783 printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]);
784 printf(" fSigmaY =%f\n", fSigmaY);
785 printf(" fSigmaY2=%f\n", fSigmaY2);
786 printf(" fMeanz =%f\n", fMeanz);
787 printf(" fZProb =%f\n", fZProb);
788 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
789 printf(" fN =%d\n", fN);
790 printf(" fN2 =%d (>8 isOK)\n",fN2);
791 printf(" fNUsed =%d\n", fNUsed);
792 printf(" fFreq =%d\n", fFreq);
793 printf(" fNChange=%d\n", fNChange);
794 printf(" fMPads =%f\n", fMPads);
795
796 printf(" fC =%f\n", fC);
797 printf(" fCC =%f\n",fCC);
798 printf(" fChi2 =%f\n", fChi2);
799 printf(" fChi2Z =%f\n", fChi2Z);
e4f2f73d 800}
47d5d320 801