ALIfied Pythia version for PYQUEN.
[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"
30
31#include "AliLog.h"
32#include "AliMathBase.h"
33
34#include "AliTRDseedV1.h"
35#include "AliTRDcluster.h"
36#include "AliTRDcalibDB.h"
37#include "AliTRDstackLayer.h"
38#include "AliTRDrecoParam.h"
39
40#define SEED_DEBUG
41
42ClassImp(AliTRDseedV1)
43
44//____________________________________________________________________
45AliTRDseedV1::AliTRDseedV1(Int_t layer, AliTRDrecoParam *p)
46 :AliTRDseed()
fbb2ea06 47 ,fLayer(layer)
48 ,fTimeBins(0)
e4f2f73d 49 ,fOwner(kFALSE)
50 ,fRecoParam(p)
51{
52 //
53 // Constructor
54 //
fbb2ea06 55
56 //AliInfo("");
57 AliTRDcalibDB *cal = AliTRDcalibDB::Instance();
58 fTimeBins = cal->GetNumberOfTimeBins();
59
e4f2f73d 60}
61
62//____________________________________________________________________
fbb2ea06 63AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref, Bool_t owner)
e4f2f73d 64 :AliTRDseed((AliTRDseed&)ref)
fbb2ea06 65 ,fLayer(ref.fLayer)
66 ,fTimeBins(ref.fTimeBins)
e4f2f73d 67 ,fOwner(kFALSE)
68 ,fRecoParam(ref.fRecoParam)
69{
70 //
71 // Copy Constructor performing a deep copy
72 //
73
74 //AliInfo("");
e4f2f73d 75
fbb2ea06 76 if(owner){
77 for(int ic=0; ic<fTimeBins; ic++){
78 if(!fClusters[ic]) continue;
79 fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
80 }
81 fOwner = kTRUE;
82 }
83
84}
d9950a5a 85
e4f2f73d 86//____________________________________________________________________
87AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
88{
89 //
90 // Assignment Operator using the copy function
91 //
92
93 //AliInfo("");
94 if(this != &ref){
95 ref.Copy(*this);
96 }
97 return *this;
98
99}
100
101//____________________________________________________________________
102AliTRDseedV1::~AliTRDseedV1()
103{
104 //
105 // Destructor. The RecoParam object belongs to the underlying tracker.
106 //
107
108 //AliInfo(Form("fOwner[%s]", fOwner?"YES":"NO"));
109
110 if(fOwner) delete [] fClusters;
111}
112
113//____________________________________________________________________
114void AliTRDseedV1::Copy(TObject &ref) const
115{
116 //
117 // Copy function
118 //
119
120 //AliInfo("");
121 AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
122
fbb2ea06 123 target.fLayer = fLayer;
124 target.fTimeBins = fTimeBins;
125 target.fRecoParam = fRecoParam;
e4f2f73d 126 AliTRDseed::Copy(target);
127}
128
129//____________________________________________________________________
130Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
131{
132 //
133 // Returns a quality measurement of the current seed
134 //
135
136 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
137 return .5 * (18.0 - fN2)
138 + 10.* TMath::Abs(fYfit[1] - fYref[1])
139 + 5.* TMath::Abs(fYfit[0] - fYref[0] + zcorr)
140 + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength;
141}
142
143//____________________________________________________________________
144Bool_t AliTRDseedV1::AttachClustersIter(AliTRDstackLayer *layer
145 , Float_t quality
146 , Bool_t kZcorr
147 , AliTRDcluster *c)
148{
149 //
150 // Iterative process to register clusters to the seed.
151 // In iteration 0 we try only one pad-row and if quality not
152 // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows)
153 //
154
155 if(!fRecoParam){
156 AliError("Seed can not be used without a valid RecoParam.");
157 return kFALSE;
158 }
fbb2ea06 159
e4f2f73d 160 Float_t tquality;
161 Double_t kroady = fRecoParam->GetRoad1y();
162 Double_t kroadz = fPadLength * .5 + 1.;
163
164 // initialize configuration parameters
165 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
166 Int_t niter = kZcorr ? 1 : 2;
167
168 Double_t yexp, zexp;
169 Int_t ncl = 0;
170 // start seed update
171 for (Int_t iter = 0; iter < niter; iter++) {
172 //AliInfo(Form("iter = %i", iter));
173 ncl = 0;
fbb2ea06 174 for (Int_t iTime = 0; iTime < fTimeBins; iTime++) {
e4f2f73d 175 // define searching configuration
176 Double_t dxlayer = layer[iTime].GetX() - fX0;
177 if(c){
178 zexp = c->GetZ();
179 //Try 2 pad-rows in second iteration
180 if (iter > 0) {
181 zexp = fZref[0] + fZref[1] * dxlayer - zcorr;
182 if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5;
183 if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5;
184 }
185 } else zexp = fZref[0];
186 yexp = fYref[0] + fYref[1] * dxlayer - zcorr;
187 // get cluster
188// printf("xexp = %3.3f ,yexp = %3.3f, zexp = %3.3f\n",layer[iTime].GetX(),yexp,zexp);
189// printf("layer[%i].GetNClusters() = %i\n", iTime, layer[iTime].GetNClusters());
190 Int_t index = layer[iTime].SearchNearestCluster(yexp, zexp, kroady, kroadz);
191// for(Int_t iclk = 0; iclk < layer[iTime].GetNClusters(); iclk++){
192// AliTRDcluster *testcl = layer[iTime].GetCluster(iclk);
fbb2ea06 193// printf("Cluster %i: x = %3.3f, y = %3.3f, z = %3.3f\n",iclk,testcl->GetX(), testcl->GetY(), testcl->GetZ());
e4f2f73d 194// }
195// printf("Index = %i\n",index);
196 if (index < 0) continue;
197
198 // Register cluster
199 AliTRDcluster *cl = (AliTRDcluster*) layer[iTime].GetCluster(index);
200
201 //printf("Cluster %i(0x%x): x = %3.3f, y = %3.3f, z = %3.3f\n", index, cl, cl->GetX(), cl->GetY(), cl->GetZ());
202
d76231c8 203 Int_t globalIndex = layer[iTime].GetGlobalIndex(index);
204 fIndexes[iTime] = globalIndex;
e4f2f73d 205 fClusters[iTime] = cl;
206 fX[iTime] = dxlayer;
207 fY[iTime] = cl->GetY();
208 fZ[iTime] = cl->GetZ();
209
210 // Debugging
211 ncl++;
212 }
213
214#ifdef SEED_DEBUG
215// Int_t nclusters = 0;
216// Float_t fD[iter] = 0.;
fbb2ea06 217// for(int ic=0; ic<fTimeBins+1; ic++){
e4f2f73d 218// AliTRDcluster *ci = fClusters[ic];
219// if(!ci) continue;
fbb2ea06 220// for(int jc=ic+1; jc<fTimeBins+1; jc++){
e4f2f73d 221// AliTRDcluster *cj = fClusters[jc];
222// if(!cj) continue;
223// fD[iter] += TMath::Sqrt((ci->GetY()-cj->GetY())*(ci->GetY()-cj->GetY())+
224// (ci->GetZ()-cj->GetZ())*(ci->GetZ()-cj->GetZ()));
225// nclusters++;
226// }
227// }
228// if(nclusters) fD[iter] /= float(nclusters);
229#endif
230
231 AliTRDseed::Update();
232
233 if(IsOK()){
234 tquality = GetQuality(kZcorr);
235 if(tquality < quality) break;
236 else quality = tquality;
237 }
238 kroadz *= 2.;
239 } // Loop: iter
240 if (!IsOK()) return kFALSE;
241
242 CookLabels();
243 UpdateUsed();
244 return kTRUE;
245}
246
247//____________________________________________________________________
fbb2ea06 248Bool_t AliTRDseedV1::AttachClustersProj(AliTRDstackLayer *layer
249 , Float_t /*quality*/
250 , Bool_t kZcorr
251 , AliTRDcluster *c)
e4f2f73d 252{
253 //
254 // Projective algorithm to attach clusters to seeding tracklets
255 //
256 // Parameters
257 //
258 // Output
259 //
260 // Detailed description
261 // 1. Collapse x coordinate for the full detector plane
262 // 2. truncated mean on y (r-phi) direction
263 // 3. purge clusters
264 // 4. truncated mean on z direction
265 // 5. purge clusters
266 // 6. fit tracklet
267 //
268
269 if(!fRecoParam){
270 AliError("Seed can not be used without a valid RecoParam.");
271 return kFALSE;
272 }
273
fbb2ea06 274 const Int_t knTimeBins = 35;
275 const Int_t kClusterCandidates = 2 * knTimeBins;
e4f2f73d 276
277 //define roads
278 Double_t kroady = fRecoParam->GetRoad1y();
279 Double_t kroadz = fPadLength * 1.5 + 1.;
280 // correction to y for the tilting angle
281 Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.;
282
283 // working variables
284 AliTRDcluster *clusters[kClusterCandidates];
fbb2ea06 285 Double_t cond[4], yexp[knTimeBins], zexp[knTimeBins],
e4f2f73d 286 yres[kClusterCandidates], zres[kClusterCandidates];
fbb2ea06 287 Int_t ncl, *index = 0x0, tboundary[knTimeBins];
e4f2f73d 288
289 // Do cluster projection
290 Int_t nYclusters = 0; Bool_t kEXIT = kFALSE;
fbb2ea06 291 for (Int_t iTime = 0; iTime < fTimeBins; iTime++) {
e4f2f73d 292 fX[iTime] = layer[iTime].GetX() - fX0;
293 zexp[iTime] = fZref[0] + fZref[1] * fX[iTime];
294 yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr;
295
296 // build condition and process clusters
297 cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady;
298 cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz;
299 layer[iTime].GetClusters(cond, index, ncl);
300 for(Int_t ic = 0; ic<ncl; ic++){
fbb2ea06 301 c = layer[iTime].GetCluster(index[ic]);
e4f2f73d 302 clusters[nYclusters] = c;
303 yres[nYclusters++] = c->GetY() - yexp[iTime];
304 if(nYclusters >= kClusterCandidates) {
305 AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates));
306 kEXIT = kTRUE;
307 break;
308 }
309 }
310 tboundary[iTime] = nYclusters;
311 if(kEXIT) break;
312 }
313
314 // Evaluate truncated mean on the y direction
315 Double_t mean, sigma;
316 AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2);
317 //purge cluster candidates
318 Int_t nZclusters = 0;
319 for(Int_t ic = 0; ic<nYclusters; ic++){
320 if(yres[ic] - mean > 4. * sigma){
321 clusters[ic] = 0x0;
322 continue;
323 }
324 zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()];
325 }
326
327 // Evaluate truncated mean on the z direction
328 AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2);
329 //purge cluster candidates
330 for(Int_t ic = 0; ic<nZclusters; ic++){
331 if(zres[ic] - mean > 4. * sigma){
332 clusters[ic] = 0x0;
333 continue;
334 }
335 }
336
337
338 // Select only one cluster/TimeBin
339 Int_t lastCluster = 0;
340 fN2 = 0;
fbb2ea06 341 for (Int_t iTime = 0; iTime < fTimeBins; iTime++) {
e4f2f73d 342 ncl = tboundary[iTime] - lastCluster;
343 if(!ncl) continue;
344 if(ncl == 1){
345 c = clusters[lastCluster];
346 } else if(ncl > 1){
347 Float_t dold = 9999.; Int_t iptr = lastCluster;
348 for(int ic=lastCluster; ic<tboundary[iTime]; ic++){
349 if(!clusters[ic]) continue;
350 Float_t y = yexp[iTime] - clusters[ic]->GetY();
351 Float_t z = zexp[iTime] - clusters[ic]->GetZ();
352 Float_t d = y * y + z * z;
353 if(d > dold) continue;
354 dold = d;
355 iptr = ic;
356 }
357 c = clusters[iptr];
358 }
fbb2ea06 359 //Int_t globalIndex = layer[iTime].GetGlobalIndex(index);
360 //fIndexes[iTime] = globalIndex;
e4f2f73d 361 fClusters[iTime] = c;
362 fY[iTime] = c->GetY();
363 fZ[iTime] = c->GetZ();
364 lastCluster = tboundary[iTime];
365 fN2++;
366 }
367
368 // number of minimum numbers of clusters expected for the tracklet
fbb2ea06 369 Int_t kClmin = Int_t(fRecoParam->GetFindableClusters()*fTimeBins);
e4f2f73d 370 if (fN2 < kClmin){
371 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
372 fN2 = 0;
373 return kFALSE;
374 }
fbb2ea06 375 AliTRDseed::Update();
e4f2f73d 376
fbb2ea06 377// // fit tracklet and update clusters
378// if(!FitTracklet()) return kFALSE;
379// UpdateUsed();
e4f2f73d 380 return kTRUE;
381}
382
383//____________________________________________________________________
fbb2ea06 384Bool_t AliTRDseedV1::FitTracklet()
e4f2f73d 385{
386 //
387 // Linear fit of the tracklet
388 //
389 // Parameters :
390 //
391 // Output :
392 // True if successful
393 //
394 // Detailed description
395 // 2. Check if tracklet crosses pad row boundary
396 // 1. Calculate residuals in the y (r-phi) direction
397 // 3. Do a Least Square Fit to the data
398 //
399
400 //Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction
401 Float_t ycrosscor = fPadLength * fTilt * 0.5; // Y correction for crossing
402 Float_t anglecor = fTilt * fZref[1]; // Correction to the angle
403
404 // calculate residuals
fbb2ea06 405 const Int_t knTimeBins = 35;
406 Float_t yres[knTimeBins]; // y (r-phi) residuals
407 Int_t zint[knTimeBins], // Histograming of the z coordinate
408 zout[2*knTimeBins];//
e4f2f73d 409
410 fN = 0;
fbb2ea06 411 for (Int_t iTime = 0; iTime < fTimeBins; iTime++) {
e4f2f73d 412 if (!fClusters[iTime]) continue;
413 yres[iTime] = fY[iTime] - fYref[0] - (fYref[1] + anglecor) * fX[iTime];
fbb2ea06 414 zint[fN++] = Int_t(fZ[iTime]);
e4f2f73d 415 }
416
417 // calculate pad row boundary crosses
fbb2ea06 418 Int_t kClmin = Int_t(fRecoParam->GetFindableClusters()*fTimeBins);
e4f2f73d 419 Int_t nz = AliMathBase::Freq(fN, zint, zout, kFALSE);
420 fZProb = zout[0];
421 if(nz <= 1) zout[3] = 0;
422 if(zout[1] + zout[3] < kClmin) {
423 AliWarning(Form("Not enough clusters to fit the cross boundary tracklet %d [%d].", zout[1]+zout[3], kClmin));
424 return kFALSE;
425 }
426 // Z distance bigger than pad - length
427 if (TMath::Abs(zout[0]-zout[2]) > fPadLength) zout[3]=0;
428
429
430 Double_t sumw = 0.,
431 sumwx = 0.,
432 sumwx2 = 0.,
433 sumwy = 0.,
434 sumwxy = 0.,
435 sumwz = 0.,
436 sumwxz = 0.;
437 Int_t npads;
438 fMPads = 0;
439 fMeanz = 0.;
fbb2ea06 440 for(int iTime=0; iTime<fTimeBins; iTime++){
e4f2f73d 441 fUsable[iTime] = kFALSE;
442 if (!fClusters[iTime]) continue;
443 npads = fClusters[iTime]->GetNPads();
444
445 fUsable[iTime] = kTRUE;
446 fN2++;
447 fMPads += npads;
448 Float_t weight = 1.0;
449 if(npads > 5) weight = 0.2;
450 else if(npads > 4) weight = 0.5;
451 sumw += weight;
452 sumwx += fX[iTime] * weight;
453 sumwx2 += fX[iTime] * fX[iTime] * weight;
454 sumwy += weight * yres[iTime];
455 sumwxy += weight * yres[iTime] * fX[iTime];
456 sumwz += weight * fZ[iTime];
457 sumwxz += weight * fZ[iTime] * fX[iTime];
458 }
459 if (fN2 < kClmin){
460 AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin));
461 fN2 = 0;
462 return kFALSE;
463 }
464 fMeanz = sumwz / sumw;
465 fNChange = 0;
466
467 // Tracklet on boundary
468 Float_t correction = 0;
469 if (fNChange > 0) {
470 if (fMeanz < fZProb) correction = ycrosscor;
471 if (fMeanz > fZProb) correction = -ycrosscor;
472 }
473
474 Double_t det = sumw * sumwx2 - sumwx * sumwx;
475 fYfitR[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det;
476 fYfitR[1] = (sumw * sumwxy - sumwx * sumwy) / det;
477
478 fSigmaY2 = 0;
fbb2ea06 479 for (Int_t i = 0; i < fTimeBins+1; i++) {
e4f2f73d 480 if (!fUsable[i]) continue;
481 Float_t delta = yres[i] - fYfitR[0] - fYfitR[1] * fX[i];
482 fSigmaY2 += delta*delta;
483 }
484 fSigmaY2 = TMath::Sqrt(fSigmaY2 / Float_t(fN2-2));
485
486 fZfitR[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
487 fZfitR[1] = (sumw * sumwxz - sumwx * sumwz) / det;
488 fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det;
489 fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det;
490 fYfitR[0] += fYref[0] + correction;
491 fYfitR[1] += fYref[1];
492 fYfit[0] = fYfitR[0];
493 fYfit[1] = fYfitR[1];
494
495 return kTRUE;
496}
497
498//_____________________________________________________________________________
499Float_t AliTRDseedV1::FitRiemanTilt(AliTRDseedV1 *cseed, Bool_t terror)
500{
501 //
502 // Fit the Rieman tilt
503 //
504
505 // Fitting with tilting pads - kz not fixed
506 AliTRDcalibDB *cal = AliTRDcalibDB::Instance();
507 Int_t nTimeBins = cal->GetNumberOfTimeBins();
508 TLinearFitter fitterT2(4,"hyp4");
509 fitterT2.StoreData(kTRUE);
510 Float_t xref2 = (cseed[2].fX0 + cseed[3].fX0) * 0.5; // Reference x0 for z
511
512 Int_t npointsT = 0;
513 fitterT2.ClearPoints();
514
515 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
516// printf("\nLayer %d\n", iLayer);
517// cseed[iLayer].Print();
518 if (!cseed[iLayer].IsOK()) continue;
519 Double_t tilt = cseed[iLayer].fTilt;
520
521 for (Int_t itime = 0; itime < nTimeBins+1; itime++) {
522// printf("\ttime %d\n", itime);
523 if (!cseed[iLayer].fUsable[itime]) continue;
524 // x relative to the midle chamber
525 Double_t x = cseed[iLayer].fX[itime] + cseed[iLayer].fX0 - xref2;
526 Double_t y = cseed[iLayer].fY[itime];
527 Double_t z = cseed[iLayer].fZ[itime];
528
529 //
530 // Tilted rieman
531 //
532 Double_t uvt[6];
533 Double_t x2 = cseed[iLayer].fX[itime] + cseed[iLayer].fX0; // Global x
534 Double_t t = 1.0 / (x2*x2 + y*y);
535 uvt[1] = t;
536 uvt[0] = 2.0 * x2 * uvt[1];
537 uvt[2] = 2.0 * tilt * uvt[1];
538 uvt[3] = 2.0 * tilt *uvt[1] * x;
539 uvt[4] = 2.0 * (y + tilt * z) * uvt[1];
540
541 Double_t error = 2.0 * uvt[1];
542 if (terror) {
543 error *= cseed[iLayer].fSigmaY;
544 }
545 else {
546 error *= 0.2; //Default error
547 }
548// printf("\tadd point :\n");
549// for(int i=0; i<5; i++) printf("%f ", uvt[i]);
550// printf("\n");
551 fitterT2.AddPoint(uvt,uvt[4],error);
552 npointsT++;
553
554 }
555
556 }
557 fitterT2.Eval();
558 Double_t rpolz0 = fitterT2.GetParameter(3);
559 Double_t rpolz1 = fitterT2.GetParameter(4);
560
561 //
562 // Linear fitter - not possible to make boundaries
563 // non accept non possible z and dzdx combination
564 //
565 Bool_t acceptablez = kTRUE;
566 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
567 if (cseed[iLayer].IsOK()) {
568 Double_t zT2 = rpolz0 + rpolz1 * (cseed[iLayer].fX0 - xref2);
569 if (TMath::Abs(cseed[iLayer].fZProb - zT2) > cseed[iLayer].fPadLength * 0.5 + 1.0) {
570 acceptablez = kFALSE;
571 }
572 }
573 }
574 if (!acceptablez) {
575 Double_t zmf = cseed[2].fZref[0] + cseed[2].fZref[1] * (xref2 - cseed[2].fX0);
576 Double_t dzmf = (cseed[2].fZref[1] + cseed[3].fZref[1]) * 0.5;
577 fitterT2.FixParameter(3,zmf);
578 fitterT2.FixParameter(4,dzmf);
579 fitterT2.Eval();
580 fitterT2.ReleaseParameter(3);
581 fitterT2.ReleaseParameter(4);
582 rpolz0 = fitterT2.GetParameter(3);
583 rpolz1 = fitterT2.GetParameter(4);
584 }
585
586 Double_t chi2TR = fitterT2.GetChisquare() / Float_t(npointsT);
587 Double_t params[3];
588 params[0] = fitterT2.GetParameter(0);
589 params[1] = fitterT2.GetParameter(1);
590 params[2] = fitterT2.GetParameter(2);
591 Double_t curvature = 1.0 + params[1] * params[1] - params[2] * params[0];
592
593 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
594
595 Double_t x = cseed[iLayer].fX0;
596 Double_t y = 0;
597 Double_t dy = 0;
598 Double_t z = 0;
599 Double_t dz = 0;
600
601 // y
602 Double_t res2 = (x * params[0] + params[1]);
603 res2 *= res2;
604 res2 = 1.0 - params[2]*params[0] + params[1]*params[1] - res2;
605 if (res2 >= 0) {
606 res2 = TMath::Sqrt(res2);
607 y = (1.0 - res2) / params[0];
608 }
609
610 //dy
611 Double_t x0 = -params[1] / params[0];
612 if (-params[2]*params[0] + params[1]*params[1] + 1 > 0) {
613 Double_t rm1 = params[0] / TMath::Sqrt(-params[2]*params[0] + params[1]*params[1] + 1);
614 if (1.0/(rm1*rm1) - (x-x0) * (x-x0) > 0.0) {
615 Double_t res = (x - x0) / TMath::Sqrt(1.0 / (rm1*rm1) - (x-x0)*(x-x0));
616 if (params[0] < 0) res *= -1.0;
617 dy = res;
618 }
619 }
620 z = rpolz0 + rpolz1 * (x - xref2);
621 dz = rpolz1;
622 cseed[iLayer].fYref[0] = y;
623 cseed[iLayer].fYref[1] = dy;
624 cseed[iLayer].fZref[0] = z;
625 cseed[iLayer].fZref[1] = dz;
626 cseed[iLayer].fC = curvature;
627
628 }
629
630 return chi2TR;
631
632}
633
634//___________________________________________________________________
635void AliTRDseedV1::Print()
636{
637 //
638 // Printing the seedstatus
639 //
640
641 AliTRDcalibDB *cal = AliTRDcalibDB::Instance();
642 Int_t nTimeBins = cal->GetNumberOfTimeBins();
643
644 printf("Seed status :\n");
645 printf(" fTilt = %f\n", fTilt);
646 printf(" fPadLength = %f\n", fPadLength);
647 printf(" fX0 = %f\n", fX0);
648 for(int ic=0; ic<nTimeBins; ic++) {
649 const Char_t *isUsable = fUsable[ic]?"Yes":"No";
fbb2ea06 650 printf(" %d X[%f] Y[%f] Z[%f] Indexes[%d] clusters[%#x] usable[%s]\n"
e4f2f73d 651 , ic
652 , fX[ic]
653 , fY[ic]
654 , fZ[ic]
655 , fIndexes[ic]
fbb2ea06 656 , ((void *) fClusters[ic])
e4f2f73d 657 , isUsable);
658 }
659
660 printf(" fYref[0] =%f fYref[1] =%f\n", fYref[0], fYref[1]);
661 printf(" fZref[0] =%f fZref[1] =%f\n", fZref[0], fZref[1]);
662 printf(" fYfit[0] =%f fYfit[1] =%f\n", fYfit[0], fYfit[1]);
663 printf(" fYfitR[0]=%f fYfitR[1]=%f\n", fYfitR[0], fYfitR[1]);
664 printf(" fZfit[0] =%f fZfit[1] =%f\n", fZfit[0], fZfit[1]);
665 printf(" fZfitR[0]=%f fZfitR[1]=%f\n", fZfitR[0], fZfitR[1]);
666 printf(" fSigmaY =%f\n", fSigmaY);
667 printf(" fSigmaY2=%f\n", fSigmaY2);
668 printf(" fMeanz =%f\n", fMeanz);
669 printf(" fZProb =%f\n", fZProb);
670 printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);
671 printf(" fN =%d\n", fN);
672 printf(" fN2 =%d (>8 isOK)\n",fN2);
673 printf(" fNUsed =%d\n", fNUsed);
674 printf(" fFreq =%d\n", fFreq);
675 printf(" fNChange=%d\n", fNChange);
676 printf(" fMPads =%f\n", fMPads);
677
678 printf(" fC =%f\n", fC);
679 printf(" fCC =%f\n",fCC);
680 printf(" fChi2 =%f\n", fChi2);
681 printf(" fChi2Z =%f\n", fChi2Z);
682
683}