more methods use the correction framework
[u/mrichter/AliRoot.git] / TRD / AliTRDseedV1.cxx
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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
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 "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//____________________________________________________________
f3d3af1b 142Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track)
0906e73e 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;
51863bc0 159 if(!track->GetProlongation(fX0, y, z)) return kFALSE;
0906e73e 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());
51863bc0 166 return kTRUE;
0906e73e 167}
168
bcb6fb78 169
170//____________________________________________________________________
171void AliTRDseedV1::CookdEdx(Int_t nslices)
172{
173// Calculates average dE/dx for all slices and store them in the internal array fdEdx.
174//
175// Parameters:
176// nslices : number of slices for which dE/dx should be calculated
177// Output:
178// store results in the internal array fdEdx. This can be accessed with the method
179// AliTRDseedV1::GetdEdx()
180//
181// Detailed description
182// Calculates average dE/dx for all slices. Depending on the PID methode
183// the number of slices can be 3 (LQ) or 8(NN).
184// The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e.
185//
186// dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2))
187//
188// The following effects are included in the calculation:
189// 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
190// 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
191// 3. cluster size
192//
193
194 Int_t nclusters[knSlices];
195 for(int i=0; i<knSlices; i++){
196 fdEdx[i] = 0.;
197 nclusters[i] = 0;
198 }
199 Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
200
201 AliTRDcluster *cluster = 0x0;
2985ffcb 202 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
bcb6fb78 203 if(!(cluster = fClusters[ic])) continue;
204 Float_t x = cluster->GetX();
205
206 // Filter clusters for dE/dx calculation
207
208 // 1.consider calibration effects for slice determination
209 Int_t slice;
210 if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength);
211 else slice = x < fX0 ? 0 : nslices-1;
212
213 // 2. take sharing into account
214 Float_t w = cluster->IsShared() ? .5 : 1.;
215
216 // 3. take into account large clusters TODO
217 //w *= c->GetNPads() > 3 ? .8 : 1.;
218
219 //CHECK !!!
220 fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
221 nclusters[slice]++;
222 } // End of loop over clusters
223
7e88424f 224 if(AliTRDReconstructor::GetRecoParam()->GetPIDMethod() == AliTRDrecoParam::kLQPID){
b83573da 225 // calculate mean charge per slice (only LQ PID)
226 for(int is=0; is<nslices; is++){
227 if(nclusters[is]) fdEdx[is] /= nclusters[is];
228 }
229 }
bcb6fb78 230}
231
b83573da 232
bcb6fb78 233//____________________________________________________________________
234Float_t AliTRDseedV1::GetdQdl(Int_t ic) const
235{
10f75631 236 return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.;
bcb6fb78 237}
238
0906e73e 239//____________________________________________________________________
240Double_t* AliTRDseedV1::GetProbability()
241{
242// Fill probability array for tracklet from the DB.
243//
244// Parameters
245//
246// Output
247// returns pointer to the probability array and 0x0 if missing DB access
248//
249// Detailed description
250
251
252 // retrive calibration db
253 AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
254 if (!calibration) {
255 AliError("No access to calibration data");
256 return 0x0;
257 }
258
7e88424f 259 const AliTRDrecoParam *rec = AliTRDReconstructor::GetRecoParam();
4ba1d6ae 260 if (!rec) {
261 AliError("No TRD reco param.");
262 return 0x0;
263 }
264
0906e73e 265 // Retrieve the CDB container class with the parametric detector response
4ba1d6ae 266 const AliTRDCalPID *pd = calibration->GetPIDObject(rec->GetPIDMethod());
0906e73e 267 if (!pd) {
268 AliError("No access to AliTRDCalPID object");
269 return 0x0;
270 }
7e88424f 271 //AliInfo(Form("Method[%d] : %s", AliTRDReconstructor::GetRecoParam()->GetPIDMethod(), pd->IsA()->GetName()));
10f75631 272
0906e73e 273 // calculate tracklet length TO DO
274 Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
275 /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane]));
276
277 //calculate dE/dx
4ba1d6ae 278 CookdEdx(rec->GetNdEdxSlices());
0906e73e 279
280 // Sets the a priori probabilities
281 for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) {
282 fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, fPlane);
283 }
284
285 return &fProb[0];
286}
287
288//____________________________________________________________________
e4f2f73d 289Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
290{
291 //
292 // Returns a quality measurement of the current seed
293 //
294
295 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
eb38ed55 296 return
297 .5 * TMath::Abs(18.0 - fN2)
e4f2f73d 298 + 10.* TMath::Abs(fYfit[1] - fYref[1])
eb38ed55 299 + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
e4f2f73d 300 + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength;
301}
302
303//____________________________________________________________________
0906e73e 304void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const
305{
306// Computes covariance in the y-z plane at radial point x
307
eb38ed55 308 Int_t ic = 0; while (!fClusters[ic]) ic++;
309 AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance();
310 Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1);
311
312 Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB);
0906e73e 313 Double_t sz2 = fPadLength/12.;
314
eb38ed55 315
0906e73e 316 //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2);
317
318 cov[0] = sy2;
319 cov[1] = fTilt*(sy2-sz2);
320 cov[2] = sz2;
321}
322
0906e73e 323
324//____________________________________________________________________
325void AliTRDseedV1::SetOwner(Bool_t own)
326{
327 //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
328
329 if(own){
330 for(int ic=0; ic<knTimebins; ic++){
331 if(!fClusters[ic]) continue;
332 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
333 }
47d5d320 334 SetBit(1);
0906e73e 335 } else {
47d5d320 336 if(IsOwner()){
0906e73e 337 for(int ic=0; ic<knTimebins; ic++){
338 if(!fClusters[ic]) continue;
339 delete fClusters[ic];
340 //fClusters[ic] = tracker->GetClusters(index) TODO
341 }
342 }
47d5d320 343 SetBit(1, kFALSE);
0906e73e 344 }
345}
346
347//____________________________________________________________________
eb38ed55 348Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c)
e4f2f73d 349{
350 //
351 // Iterative process to register clusters to the seed.
352 // In iteration 0 we try only one pad-row and if quality not
353 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
354 //
eb38ed55 355 // debug level 7
356 //
e4f2f73d 357
7e88424f 358 if(!AliTRDReconstructor::GetRecoParam()){
e4f2f73d 359 AliError("Seed can not be used without a valid RecoParam.");
360 return kFALSE;
361 }
0906e73e 362
eb38ed55 363 AliTRDchamberTimeBin *layer = 0x0;
7e88424f 364 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel()>=7 && c){
eb38ed55 365 TClonesArray clusters("AliTRDcluster", 24);
366 clusters.SetOwner(kTRUE);
367 AliTRDcluster *cc = 0x0;
368 Int_t det=-1, ncl, ncls = 0;
2985ffcb 369 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 370 if(!(layer = chamber->GetTB(iTime))) continue;
371 if(!(ncl = Int_t(*layer))) continue;
372 for(int ic=0; ic<ncl; ic++){
373 cc = (*layer)[ic];
374 det = cc->GetDetector();
375 new(clusters[ncls++]) AliTRDcluster(*cc);
376 }
377 }
378 AliInfo(Form("N clusters[%d] = %d", fPlane, ncls));
379
380 Int_t ref = c ? 1 : 0;
381 TTreeSRedirector &cstreamer = *AliTRDtrackerV1::DebugStreamer();
382 cstreamer << "AttachClustersIter"
383 << "det=" << det
384 << "ref=" << ref
385 << "clusters.=" << &clusters
386 << "tracklet.=" << this
387 << "cl.=" << c
388 << "\n";
389 }
0906e73e 390
e4f2f73d 391 Float_t tquality;
7e88424f 392 Double_t kroady = AliTRDReconstructor::GetRecoParam()->GetRoad1y();
e4f2f73d 393 Double_t kroadz = fPadLength * .5 + 1.;
394
395 // initialize configuration parameters
396 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
397 Int_t niter = kZcorr ? 1 : 2;
398
399 Double_t yexp, zexp;
400 Int_t ncl = 0;
401 // start seed update
402 for (Int_t iter = 0; iter < niter; iter++) {
e4f2f73d 403 ncl = 0;
2985ffcb 404 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 405 if(!(layer = chamber->GetTB(iTime))) continue;
406 if(!Int_t(*layer)) continue;
407
e4f2f73d 408 // define searching configuration
eb38ed55 409 Double_t dxlayer = layer->GetX() - fX0;
e4f2f73d 410 if(c){
411 zexp = c->GetZ();
412 //Try 2 pad-rows in second iteration
413 if (iter > 0) {
414 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
415 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
416 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
417 }
eb38ed55 418 } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.);
e4f2f73d 419 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
bcb6fb78 420
421 // Get and register cluster
eb38ed55 422 Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz);
e4f2f73d 423 if (index < 0) continue;
eb38ed55 424 AliTRDcluster *cl = (*layer)[index];
e4f2f73d 425
eb38ed55 426 fIndexes[iTime] = layer->GetGlobalIndex(index);
e4f2f73d 427 fClusters[iTime] = cl;
e4f2f73d 428 fY[iTime] = cl->GetY();
429 fZ[iTime] = cl->GetZ();
e4f2f73d 430 ncl++;
431 }
7e88424f 432 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel()>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fPlane, ncl));
bcb6fb78 433
eb38ed55 434 if(ncl>1){
bcb6fb78 435 // calculate length of the time bin (calibration aware)
436 Int_t irp = 0; Float_t x[2]; Int_t tb[2];
2985ffcb 437 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
bcb6fb78 438 if(!fClusters[iTime]) continue;
439 x[irp] = fClusters[iTime]->GetX();
440 tb[irp] = iTime;
441 irp++;
442 if(irp==2) break;
443 }
444 fdX = (x[1] - x[0]) / (tb[0] - tb[1]);
445
446 // update X0 from the clusters (calibration/alignment aware)
2985ffcb 447 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 448 if(!(layer = chamber->GetTB(iTime))) continue;
449 if(!layer->IsT0()) continue;
bcb6fb78 450 if(fClusters[iTime]){
451 fX0 = fClusters[iTime]->GetX();
452 break;
453 } else { // we have to infere the position of the anode wire from the other clusters
2985ffcb 454 for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) {
bcb6fb78 455 if(!fClusters[jTime]) continue;
456 fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime);
457 }
458 break;
459 }
460 }
461
462 // update YZ reference point
463 // TODO
464
465 // update x reference positions (calibration/alignment aware)
2985ffcb 466 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
bcb6fb78 467 if(!fClusters[iTime]) continue;
468 fX[iTime] = fClusters[iTime]->GetX() - fX0;
469 }
470
471 AliTRDseed::Update();
472 }
7e88424f 473 if(AliTRDReconstructor::GetRecoParam()->GetStreamLevel()>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fPlane, fN2));
bcb6fb78 474
e4f2f73d 475 if(IsOK()){
476 tquality = GetQuality(kZcorr);
477 if(tquality < quality) break;
478 else quality = tquality;
479 }
480 kroadz *= 2.;
481 } // Loop: iter
482 if (!IsOK()) return kFALSE;
483
484 CookLabels();
485 UpdateUsed();
486 return kTRUE;
487}
488
489//____________________________________________________________________
eb38ed55 490Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber
0906e73e 491 ,Bool_t kZcorr)
e4f2f73d 492{
493 //
494 // Projective algorithm to attach clusters to seeding tracklets
495 //
496 // Parameters
497 //
498 // Output
499 //
500 // Detailed description
501 // 1. Collapse x coordinate for the full detector plane
502 // 2. truncated mean on y (r-phi) direction
503 // 3. purge clusters
504 // 4. truncated mean on z direction
505 // 5. purge clusters
506 // 6. fit tracklet
507 //
508
7e88424f 509 if(!AliTRDReconstructor::GetRecoParam()){
e4f2f73d 510 AliError("Seed can not be used without a valid RecoParam.");
511 return kFALSE;
512 }
513
0906e73e 514 const Int_t kClusterCandidates = 2 * knTimebins;
e4f2f73d 515
516 //define roads
7e88424f 517 Double_t kroady = AliTRDReconstructor::GetRecoParam()->GetRoad1y();
e4f2f73d 518 Double_t kroadz = fPadLength * 1.5 + 1.;
519 // correction to y for the tilting angle
520 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
521
522 // working variables
523 AliTRDcluster *clusters[kClusterCandidates];
0906e73e 524 Double_t cond[4], yexp[knTimebins], zexp[knTimebins],
e4f2f73d 525 yres[kClusterCandidates], zres[kClusterCandidates];
0906e73e 526 Int_t ncl, *index = 0x0, tboundary[knTimebins];
e4f2f73d 527
528 // Do cluster projection
eb38ed55 529 AliTRDchamberTimeBin *layer = 0x0;
e4f2f73d 530 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
2985ffcb 531 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
eb38ed55 532 if(!(layer = chamber->GetTB(iTime))) continue;
533 if(!Int_t(*layer)) continue;
534
535 fX[iTime] = layer->GetX() - fX0;
e4f2f73d 536 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
537 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
538
539 // build condition and process clusters
540 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
541 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
eb38ed55 542 layer->GetClusters(cond, index, ncl);
e4f2f73d 543 for(Int_t ic = 0; ic<ncl; ic++){
eb38ed55 544 AliTRDcluster *c = layer->GetCluster(index[ic]);
e4f2f73d 545 clusters[nYclusters] = c;
546 yres[nYclusters++] = c->GetY() - yexp[iTime];
547 if(nYclusters >= kClusterCandidates) {
548 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
549 kEXIT = kTRUE;
550 break;
551 }
552 }
553 tboundary[iTime] = nYclusters;
554 if(kEXIT) break;
555 }
556
557 // Evaluate truncated mean on the y direction
558 Double_t mean, sigma;
559 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
eb38ed55 560 // purge cluster candidates
e4f2f73d 561 Int_t nZclusters = 0;
562 for(Int_t ic = 0; ic<nYclusters; ic++){
563 if(yres[ic] - mean > 4. * sigma){
564 clusters[ic] = 0x0;
565 continue;
566 }
567 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
568 }
569
570 // Evaluate truncated mean on the z direction
571 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
eb38ed55 572 // purge cluster candidates
e4f2f73d 573 for(Int_t ic = 0; ic<nZclusters; ic++){
574 if(zres[ic] - mean > 4. * sigma){
575 clusters[ic] = 0x0;
576 continue;
577 }
578 }
579
580
581 // Select only one cluster/TimeBin
582 Int_t lastCluster = 0;
583 fN2 = 0;
2985ffcb 584 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
e4f2f73d 585 ncl = tboundary[iTime] - lastCluster;
586 if(!ncl) continue;
eb38ed55 587 Int_t iptr = lastCluster;
588 if(ncl > 1){
589 Float_t dold = 9999.;
e4f2f73d 590 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
591 if(!clusters[ic]) continue;
592 Float_t y = yexp[iTime] - clusters[ic]->GetY();
593 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
594 Float_t d = y * y + z * z;
595 if(d > dold) continue;
596 dold = d;
597 iptr = ic;
598 }
e4f2f73d 599 }
eb38ed55 600 fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr);
601 fClusters[iTime] = clusters[iptr];
602 fY[iTime] = clusters[iptr]->GetY();
603 fZ[iTime] = clusters[iptr]->GetZ();
0906e73e 604 lastCluster = tboundary[iTime];
e4f2f73d 605 fN2++;
606 }
607
608 // number of minimum numbers of clusters expected for the tracklet
7e88424f 609 Int_t kClmin = Int_t(AliTRDReconstructor::GetRecoParam()->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
e4f2f73d 610 if (fN2 < kClmin){
611 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
612 fN2 = 0;
613 return kFALSE;
614 }
0906e73e 615
616 // update used clusters
617 fNUsed = 0;
2985ffcb 618 for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) {
0906e73e 619 if(!fClusters[iTime]) continue;
620 if((fClusters[iTime]->IsUsed())) fNUsed++;
621 }
622
623 if (fN2-fNUsed < kClmin){
624 AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2));
625 fN2 = 0;
626 return kFALSE;
627 }
e4f2f73d 628
e4f2f73d 629 return kTRUE;
630}
631
632//____________________________________________________________________
0906e73e 633Bool_t AliTRDseedV1::Fit()
e4f2f73d 634{
635 //
636 // Linear fit of the tracklet
637 //
638 // Parameters :
639 //
640 // Output :
641 // True if successful
642 //
643 // Detailed description
644 // 2. Check if tracklet crosses pad row boundary
645 // 1. Calculate residuals in the y (r-phi) direction
646 // 3. Do a Least Square Fit to the data
647 //
648
47d5d320 649 const Int_t kClmin = 8;
650 const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins();
8acca6a3 651 AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ;
47d5d320 652
653 // convertion factor from square to gauss distribution for sigma
654 Double_t convert = 1./TMath::Sqrt(12.);
655
656 // book cluster information
8acca6a3 657 Double_t xc[knTimebins+1], yc[knTimebins], zc[knTimebins+1], sy[knTimebins], sz[knTimebins+1];
47d5d320 658 Int_t zRow[knTimebins];
659 AliTRDcluster *c = 0x0;
660 Int_t nc = 0;
661 for (Int_t ic=0; ic<kNtb; ic++) {
662 zRow[ic] = -1;
663 xc[ic] = -1.;
664 yc[ic] = 999.;
665 zc[ic] = 999.;
666 sy[ic] = 0.;
667 sz[ic] = 0.;
668 if(!(c = fClusters[ic])) continue;
669 if(!c->IsInChamber()) continue;
670 Float_t w = 1.;
671 if(c->GetNPads()>4) w = .5;
672 if(c->GetNPads()>5) w = .2;
673 zRow[nc] = c->GetPadRow();
674 xc[nc] = fX0 - c->GetX();
675 yc[nc] = c->GetY();
676 zc[nc] = c->GetZ();
677 sy[ic] = w; // all clusters have the same sigma
678 sz[ic] = fPadLength*convert;
8acca6a3 679 fitterZ.AddPoint(&xc[ic], zc[ic], sz[ic]);
47d5d320 680 nc++;
681 }
682 // to few clusters
683 if (nc < kClmin) return kFALSE;
684
e4f2f73d 685
47d5d320 686 Int_t zN[2*35];
687 Int_t nz = AliTRDtrackerV1::Freq(nc, zRow, zN, kFALSE);
688 // more than one pad row crossing
689 if(nz>2) return kFALSE;
e4f2f73d 690
47d5d320 691 // estimate reference parameter at average x
692 Double_t y0 = fYref[0];
693 Double_t dydx = fYref[1];
694 Double_t dzdx = fZref[1];
695 zc[nc] = fZref[0];
696
697 // determine z offset of the fit
698 Int_t nchanges = 0, nCross = 0;
699 if(nz==2){ // tracklet is crossing pad row
700 // Find the break time allowing one chage on pad-rows
701 // with maximal number of accepted clusters
702 Int_t padRef = zRow[0];
703 for (Int_t ic=1; ic<nc; ic++) {
704 if(zRow[ic] == padRef) continue;
705
706 // debug
707 if(zRow[ic-1] == zRow[ic]){
708 printf("ERROR in pad row change!!!\n");
709 }
710
711 // evaluate parameters of the crossing point
712 Float_t sx = (xc[ic-1] - xc[ic])*convert;
713 xc[nc] = .5 * (xc[ic-1] + xc[ic]);
714 zc[nc] = .5 * (zc[ic-1] + zc[ic]);
715 sz[nc] = TMath::Max(dzdx * sx, .01);
716 dzdx = zc[ic-1] > zc[ic] ? 1. : -1.;
717 padRef = zRow[ic];
718 nCross = ic;
719 nchanges++;
720 }
e4f2f73d 721 }
722
47d5d320 723 // condition on nCross and reset nchanges TODO
724
47d5d320 725 if(nchanges==1){
726 if(dzdx * fZref[1] < 0.){
727 AliInfo("tracklet direction does not correspond to the track direction. TODO.");
728 }
729 SetBit(2, kTRUE); // mark pad row crossing
730 fCross[0] = xc[nc]; fCross[2] = zc[nc]; fCross[3] = sz[nc];
8acca6a3 731 fitterZ.AddPoint(&xc[nc], zc[nc], sz[nc]);
732 fitterZ.Eval();
733 dzdx = fZref[1]; // we don't trust Parameter[1] ??;
734 zc[nc] = fitterZ.GetFunctionParameter(0);
47d5d320 735 } else if(nchanges > 1){ // debug
736 AliInfo("ERROR in n changes!!!");
e4f2f73d 737 return kFALSE;
738 }
47d5d320 739
740
741 // estimate deviation from reference direction
742 dzdx *= fTilt;
743 for (Int_t ic=0; ic<nc; ic++) {
744 yc[ic] -= y0 + xc[ic]*(dydx + dzdx) + fTilt * (zc[ic] - zc[nc]);
8acca6a3 745 fitterY.AddPoint(&xc[ic], yc[ic], sy[ic]);
e4f2f73d 746 }
8acca6a3 747 fitterY.Eval();
748 fYfit[0] = y0+fitterY.GetFunctionParameter(0);
749 fYfit[1] = dydx+fitterY.GetFunctionParameter(1);
47d5d320 750 if(nchanges) fCross[1] = fYfit[0] + fCross[0] * fYfit[1];
e4f2f73d 751
47d5d320 752// printf("\nnz = %d\n", nz);
753// for(int ic=0; ic<35; ic++) printf("%d row[%d]\n", ic, zRow[ic]);
754//
755// for(int ic=0; ic<nz; ic++) printf("%d n[%d]\n", ic, zN[ic]);
e4f2f73d 756
757 return kTRUE;
758}
759
47d5d320 760//___________________________________________________________________
761void AliTRDseedV1::Draw(Option_t*)
762{
763}
e4f2f73d 764
765//___________________________________________________________________
47d5d320 766void AliTRDseedV1::Print(Option_t*) const
e4f2f73d 767{
768 //
769 // Printing the seedstatus
770 //
771
e4f2f73d 772 printf("Seed status :\n");
773 printf(" fTilt = %f\n", fTilt);
774 printf(" fPadLength = %f\n", fPadLength);
775 printf(" fX0 = %f\n", fX0);
2985ffcb 776 for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++) {
e4f2f73d 777 const Char_t *isUsable = fUsable[ic]?"Yes":"No";
0906e73e 778 printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%p] usable[%s]\n"
e4f2f73d 779 , ic
780 , fX[ic]
781 , fY[ic]
782 , fZ[ic]
783 , fIndexes[ic]
0906e73e 784 , ((void*) fClusters[ic])
e4f2f73d 785 , isUsable);
786 }
787
788 printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]);
789 printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]);
790 printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]);
791 printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]);
792 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
793 printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]);
794 printf(" fSigmaY =%f\n", fSigmaY);
795 printf(" fSigmaY2=%f\n", fSigmaY2);
796 printf(" fMeanz =%f\n", fMeanz);
797 printf(" fZProb =%f\n", fZProb);
798 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
799 printf(" fN =%d\n", fN);
800 printf(" fN2 =%d (>8 isOK)\n",fN2);
801 printf(" fNUsed =%d\n", fNUsed);
802 printf(" fFreq =%d\n", fFreq);
803 printf(" fNChange=%d\n", fNChange);
804 printf(" fMPads =%f\n", fMPads);
805
806 printf(" fC =%f\n", fC);
807 printf(" fCC =%f\n",fCC);
808 printf(" fChi2 =%f\n", fChi2);
809 printf(" fChi2Z =%f\n", fChi2Z);
e4f2f73d 810}
47d5d320 811