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6d75e4b6 | 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 | // fast TPC cluster simulation // | |
21 | // // | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include <TParticle.h> | |
25 | ||
26 | #include "AliRunLoader.h" | |
27 | #include "AliRun.h" | |
28 | #include "AliMC.h" | |
29 | #include "AliTPC.h" | |
30 | #include "AliTPCParam.h" | |
31 | #include "AliTPCClustersArray.h" | |
32 | #include "AliTPCClustersRow.h" | |
33 | #include "AliTPCcluster.h" | |
34 | #include "AliComplexCluster.h" | |
35 | #include "AliTPCFast.h" | |
36 | ||
37 | ||
38 | ClassImp(AliTPCFast) | |
39 | ||
40 | ||
41 | //_____________________________________________________________________________ | |
42 | void AliTPCFast::Hits2Clusters(AliRunLoader* runLoader) const | |
43 | { | |
44 | //-------------------------------------------------------- | |
45 | // TPC simple cluster generator from hits | |
46 | // obtained from the TPC Fast Simulator | |
47 | // The point errors are taken from the parametrization | |
48 | //-------------------------------------------------------- | |
49 | ||
50 | //----------------------------------------------------------------- | |
51 | // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl | |
52 | //----------------------------------------------------------------- | |
53 | // Adopted to Marian's cluster data structure by I.Belikov, CERN, | |
54 | // Jouri.Belikov@cern.ch | |
55 | //---------------------------------------------------------------- | |
56 | ||
57 | ///////////////////////////////////////////////////////////////////////////// | |
58 | // | |
59 | //--------------------------------------------------------------------- | |
60 | // ALICE TPC Cluster Parameters | |
61 | //-------------------------------------------------------------------- | |
62 | ||
63 | ||
64 | ||
65 | // Cluster width in rphi | |
66 | const Float_t kACrphi=0.18322; | |
67 | const Float_t kBCrphi=0.59551e-3; | |
68 | const Float_t kCCrphi=0.60952e-1; | |
69 | // Cluster width in z | |
70 | const Float_t kACz=0.19081; | |
71 | const Float_t kBCz=0.55938e-3; | |
72 | const Float_t kCCz=0.30428; | |
73 | ||
74 | ||
75 | AliLoader* loader = runLoader->GetLoader("TPCLoader"); | |
76 | if (!loader) { | |
77 | Error("Hits2Clusters", "No TPC loader found"); | |
78 | return; | |
79 | } | |
80 | if (!runLoader->GetAliRun()) runLoader->LoadgAlice(); | |
81 | AliRun* aliRun = runLoader->GetAliRun(); | |
82 | if (!aliRun) { | |
83 | Error("Hits2Clusters", "Couldn't get AliRun object"); | |
84 | return; | |
85 | } | |
86 | AliTPC* tpc = (AliTPC*) aliRun->GetDetector("TPC"); | |
87 | if (!tpc) { | |
88 | Error("Hits2Clusters", "Couldn't get TPC detector"); | |
89 | return; | |
90 | } | |
91 | AliTPCParam* param = tpc->GetParam(); | |
92 | if (!param) { | |
93 | Error("Hits2Clusters", "No TPC parameters available"); | |
94 | return; | |
95 | } | |
96 | ||
97 | //if(fDefaults == 0) SetDefaults(); | |
98 | ||
99 | Float_t sigmaRphi,sigmaZ,clRphi,clZ; | |
100 | // | |
101 | TParticle *particle; // pointer to a given particle | |
102 | AliTPChit *tpcHit; // pointer to a sigle TPC hit | |
103 | Int_t sector; | |
104 | Int_t ipart; | |
105 | Float_t xyz[5]; | |
106 | Float_t pl,pt,tanth,rpad,ratio; | |
107 | Float_t cph,sph; | |
108 | ||
109 | //--------------------------------------------------------------- | |
110 | // Get the access to the tracks | |
111 | //--------------------------------------------------------------- | |
112 | ||
113 | TTree *tH = loader->TreeH(); | |
114 | if (tH == 0x0) | |
115 | { | |
116 | Fatal("Hits2Clusters","Can not find TreeH in folder"); | |
117 | return; | |
118 | } | |
119 | tpc->SetTreeAddress(); | |
120 | ||
121 | Stat_t ntracks = tH->GetEntries(); | |
122 | ||
123 | //Switch to the output file | |
124 | ||
125 | if (loader->TreeR() == 0x0) loader->MakeTree("R"); | |
126 | ||
127 | cout<<"param->GetTitle() = "<<param->GetTitle()<<endl; | |
128 | ||
129 | runLoader->CdGAFile(); | |
130 | //param->Write(param->GetTitle()); | |
131 | ||
132 | AliTPCClustersArray carray; | |
133 | carray.Setup(param); | |
134 | carray.SetClusterType("AliTPCcluster"); | |
135 | carray.MakeTree(loader->TreeR()); | |
136 | ||
137 | Int_t nclusters=0; //cluster counter | |
138 | ||
139 | //------------------------------------------------------------ | |
140 | // Loop over all sectors (72 sectors for 20 deg | |
141 | // segmentation for both lower and upper sectors) | |
142 | // Sectors 0-35 are lower sectors, 0-17 z>0, 17-35 z<0 | |
143 | // Sectors 36-71 are upper sectors, 36-53 z>0, 54-71 z<0 | |
144 | // | |
145 | // First cluster for sector 0 starts at "0" | |
146 | //------------------------------------------------------------ | |
147 | ||
148 | for(Int_t isec=0;isec<param->GetNSector();isec++){ | |
149 | //MI change | |
150 | param->AdjustCosSin(isec,cph,sph); | |
151 | ||
152 | //------------------------------------------------------------ | |
153 | // Loop over tracks | |
154 | //------------------------------------------------------------ | |
155 | ||
156 | for(Int_t track=0;track<ntracks;track++){ | |
157 | tpc->ResetHits(); | |
158 | tH->GetEvent(track); | |
159 | // | |
160 | // Get number of the TPC hits | |
161 | // | |
162 | tpcHit = (AliTPChit*)tpc->FirstHit(-1); | |
163 | ||
164 | // Loop over hits | |
165 | // | |
166 | while(tpcHit){ | |
167 | ||
168 | if (tpcHit->fQ == 0.) { | |
169 | tpcHit = (AliTPChit*) tpc->NextHit(); | |
170 | continue; //information about track (I.Belikov) | |
171 | } | |
172 | sector=tpcHit->fSector; // sector number | |
173 | ||
174 | if(sector != isec){ | |
175 | tpcHit = (AliTPChit*) tpc->NextHit(); | |
176 | continue; | |
177 | } | |
178 | ipart=tpcHit->Track(); | |
179 | particle=aliRun->GetMCApp()->Particle(ipart); | |
180 | pl=particle->Pz(); | |
181 | pt=particle->Pt(); | |
182 | if(pt < 1.e-9) pt=1.e-9; | |
183 | tanth=pl/pt; | |
184 | tanth = TMath::Abs(tanth); | |
185 | rpad=TMath::Sqrt(tpcHit->X()*tpcHit->X() + tpcHit->Y()*tpcHit->Y()); | |
186 | ratio=0.001*rpad/pt; // pt must be in MeV/c - historical reason | |
187 | ||
188 | // space-point resolutions | |
189 | ||
190 | sigmaRphi=AliTPCcluster::SigmaY2(rpad,tanth,pt); | |
191 | sigmaZ =AliTPCcluster::SigmaZ2(rpad,tanth ); | |
192 | ||
193 | // cluster widths | |
194 | ||
195 | clRphi=kACrphi-kBCrphi*rpad*tanth+kCCrphi*ratio*ratio; | |
196 | clZ=kACz-kBCz*rpad*tanth+kCCz*tanth*tanth; | |
197 | ||
198 | // temporary protection | |
199 | ||
200 | if(sigmaRphi < 0.) sigmaRphi=0.4e-3; | |
201 | if(sigmaZ < 0.) sigmaZ=0.4e-3; | |
202 | if(clRphi < 0.) clRphi=2.5e-3; | |
203 | if(clZ < 0.) clZ=2.5e-5; | |
204 | ||
205 | // | |
206 | ||
207 | // | |
208 | // smearing --> rotate to the 1 (13) or to the 25 (49) sector, | |
209 | // then the inaccuracy in a X-Y plane is only along Y (pad row)! | |
210 | // | |
211 | Float_t xprim= tpcHit->X()*cph + tpcHit->Y()*sph; | |
212 | Float_t yprim=-tpcHit->X()*sph + tpcHit->Y()*cph; | |
213 | xyz[0]=gRandom->Gaus(yprim,TMath::Sqrt(sigmaRphi)); // y | |
214 | Float_t alpha=(isec < param->GetNInnerSector()) ? | |
215 | param->GetInnerAngle() : param->GetOuterAngle(); | |
216 | Float_t ymax=xprim*TMath::Tan(0.5*alpha); | |
217 | if (TMath::Abs(xyz[0])>ymax) xyz[0]=yprim; | |
218 | xyz[1]=gRandom->Gaus(tpcHit->Z(),TMath::Sqrt(sigmaZ)); // z | |
219 | if (TMath::Abs(xyz[1])>param->GetZLength()) xyz[1]=tpcHit->Z(); | |
220 | xyz[2]=sigmaRphi; // fSigmaY2 | |
221 | xyz[3]=sigmaZ; // fSigmaZ2 | |
222 | xyz[4]=tpcHit->fQ; // q | |
223 | ||
224 | AliTPCClustersRow *clrow=carray.GetRow(sector,tpcHit->fPadRow); | |
225 | if (!clrow) clrow=carray.CreateRow(sector,tpcHit->fPadRow); | |
226 | ||
227 | Int_t tracks[3]={tpcHit->Track(), -1, -1}; | |
228 | AliTPCcluster cluster(tracks,xyz); | |
229 | ||
230 | clrow->InsertCluster(&cluster); nclusters++; | |
231 | ||
232 | tpcHit = (AliTPChit*)tpc->NextHit(); | |
233 | ||
234 | ||
235 | } // end of loop over hits | |
236 | ||
237 | } // end of loop over tracks | |
238 | ||
239 | Int_t nrows=param->GetNRow(isec); | |
240 | for (Int_t irow=0; irow<nrows; irow++) { | |
241 | AliTPCClustersRow *clrow=carray.GetRow(isec,irow); | |
242 | if (!clrow) continue; | |
243 | carray.StoreRow(isec,irow); | |
244 | carray.ClearRow(isec,irow); | |
245 | } | |
246 | ||
247 | } // end of loop over sectors | |
248 | ||
249 | // cerr<<"Number of made clusters : "<<nclusters<<" \n"; | |
250 | loader->WriteRecPoints("OVERWRITE"); | |
251 | ||
252 | ||
253 | } // end of function | |
254 | ||
255 | //_________________________________________________________________ | |
256 | void AliTPCFast::Hits2ExactClustersSector(AliRunLoader* runLoader, | |
257 | AliTPCClustersArray* clustersArray, | |
258 | Int_t isec) const | |
259 | { | |
260 | //-------------------------------------------------------- | |
261 | //calculate exact cross point of track and given pad row | |
262 | //resulting values are expressed in "digit" coordinata | |
263 | //-------------------------------------------------------- | |
264 | ||
265 | //----------------------------------------------------------------- | |
266 | // Origin: Marian Ivanov GSI Darmstadt, m.ivanov@gsi.de | |
267 | //----------------------------------------------------------------- | |
268 | // | |
269 | if (clustersArray==0){ | |
270 | return; | |
271 | } | |
272 | AliLoader* loader = runLoader->GetLoader("TPCLoader"); | |
273 | if (!loader) { | |
274 | Error("Hits2ExactClustersSector", "No TPC loader found"); | |
275 | return; | |
276 | } | |
277 | if (!runLoader->GetAliRun()) runLoader->LoadgAlice(); | |
278 | AliRun* aliRun = runLoader->GetAliRun(); | |
279 | if (!aliRun) { | |
280 | Error("Hits2ExactClustersSector", "Couldn't get AliRun object"); | |
281 | return; | |
282 | } | |
283 | AliTPC* tpc = (AliTPC*) aliRun->GetDetector("TPC"); | |
284 | if (!tpc) { | |
285 | Error("Hits2ExactClustersSector", "Couldn't get TPC detector"); | |
286 | return; | |
287 | } | |
288 | AliTPCParam* param = tpc->GetParam(); | |
289 | if (!param) { | |
290 | Error("Hits2ExactClustersSector", "No TPC parameters available"); | |
291 | return; | |
292 | } | |
293 | // | |
294 | TParticle *particle; // pointer to a given particle | |
295 | AliTPChit *tpcHit; // pointer to a sigle TPC hit | |
296 | // Int_t sector,nhits; | |
297 | Int_t ipart; | |
298 | const Int_t kcmaxhits=30000; | |
299 | AliTPCFastVector * xxxx = new AliTPCFastVector(kcmaxhits*4); | |
300 | AliTPCFastVector & xxx = *xxxx; | |
301 | Int_t maxhits = kcmaxhits; | |
302 | //construct array for each padrow | |
303 | for (Int_t i=0; i<param->GetNRow(isec);i++) | |
304 | clustersArray->CreateRow(isec,i); | |
305 | ||
306 | //--------------------------------------------------------------- | |
307 | // Get the access to the tracks | |
308 | //--------------------------------------------------------------- | |
309 | ||
310 | TTree *tH = loader->TreeH(); | |
311 | if (tH == 0x0) | |
312 | { | |
313 | Fatal("Hits2Clusters","Can not find TreeH in folder"); | |
314 | return; | |
315 | } | |
316 | tpc->SetTreeAddress(); | |
317 | ||
318 | Stat_t ntracks = tH->GetEntries(); | |
319 | Int_t npart = aliRun->GetMCApp()->GetNtrack(); | |
320 | //MI change | |
321 | TBranch * branch=0; | |
322 | if (tpc->GetHitType()>1) branch = tH->GetBranch("TPC2"); | |
323 | else branch = tH->GetBranch("TPC"); | |
324 | ||
325 | //------------------------------------------------------------ | |
326 | // Loop over tracks | |
327 | //------------------------------------------------------------ | |
328 | ||
329 | for(Int_t track=0;track<ntracks;track++){ | |
330 | Bool_t isInSector=kTRUE; | |
331 | tpc->ResetHits(); | |
332 | isInSector = tpc->TrackInVolume(isec,track); | |
333 | if (!isInSector) continue; | |
334 | //MI change | |
335 | branch->GetEntry(track); // get next track | |
336 | // | |
337 | // Get number of the TPC hits and a pointer | |
338 | // to the particles | |
339 | // Loop over hits | |
340 | // | |
341 | Int_t currentIndex=0; | |
342 | Int_t lastrow=-1; //last writen row | |
343 | ||
344 | //M.I. changes | |
345 | ||
346 | tpcHit = (AliTPChit*)tpc->FirstHit(-1); | |
347 | while(tpcHit){ | |
348 | ||
349 | Int_t sector=tpcHit->fSector; // sector number | |
350 | if(sector != isec){ | |
351 | tpcHit = (AliTPChit*) tpc->NextHit(); | |
352 | continue; | |
353 | } | |
354 | ||
355 | ipart=tpcHit->Track(); | |
356 | if (ipart<npart) particle=aliRun->GetMCApp()->Particle(ipart); | |
357 | ||
358 | //find row number | |
359 | ||
360 | Float_t x[3]={tpcHit->X(),tpcHit->Y(),tpcHit->Z()}; | |
361 | Int_t index[3]={1,isec,0}; | |
362 | Int_t currentrow = param->GetPadRow(x,index) ; | |
363 | if (currentrow<0) {tpcHit = (AliTPChit*)tpc->NextHit(); continue;} | |
364 | if (lastrow<0) lastrow=currentrow; | |
365 | if (currentrow==lastrow){ | |
366 | if ( currentIndex>=maxhits){ | |
367 | maxhits+=kcmaxhits; | |
368 | xxx.ResizeTo(4*maxhits); | |
369 | } | |
370 | xxx(currentIndex*4)=x[0]; | |
371 | xxx(currentIndex*4+1)=x[1]; | |
372 | xxx(currentIndex*4+2)=x[2]; | |
373 | xxx(currentIndex*4+3)=tpcHit->fQ; | |
374 | currentIndex++; | |
375 | } | |
376 | else | |
377 | if (currentIndex>2){ | |
378 | Float_t sumx=0; | |
379 | Float_t sumx2=0; | |
380 | Float_t sumx3=0; | |
381 | Float_t sumx4=0; | |
382 | Float_t sumy=0; | |
383 | Float_t sumxy=0; | |
384 | Float_t sumx2y=0; | |
385 | Float_t sumz=0; | |
386 | Float_t sumxz=0; | |
387 | Float_t sumx2z=0; | |
388 | Float_t sumq=0; | |
389 | for (Int_t index=0;index<currentIndex;index++){ | |
390 | Float_t x,x2,x3,x4; | |
391 | x=x2=x3=x4=xxx(index*4); | |
392 | x2*=x; | |
393 | x3*=x2; | |
394 | x4*=x3; | |
395 | sumx+=x; | |
396 | sumx2+=x2; | |
397 | sumx3+=x3; | |
398 | sumx4+=x4; | |
399 | sumy+=xxx(index*4+1); | |
400 | sumxy+=xxx(index*4+1)*x; | |
401 | sumx2y+=xxx(index*4+1)*x2; | |
402 | sumz+=xxx(index*4+2); | |
403 | sumxz+=xxx(index*4+2)*x; | |
404 | sumx2z+=xxx(index*4+2)*x2; | |
405 | sumq+=xxx(index*4+3); | |
406 | } | |
407 | Float_t centralPad = (param->GetNPads(isec,lastrow)-1)/2; | |
408 | Float_t det=currentIndex*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumx*sumx4-sumx2*sumx3)+ | |
409 | sumx2*(sumx*sumx3-sumx2*sumx2); | |
410 | ||
411 | Float_t detay=sumy*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxy*sumx4-sumx2y*sumx3)+ | |
412 | sumx2*(sumxy*sumx3-sumx2y*sumx2); | |
413 | Float_t detaz=sumz*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxz*sumx4-sumx2z*sumx3)+ | |
414 | sumx2*(sumxz*sumx3-sumx2z*sumx2); | |
415 | ||
416 | Float_t detby=currentIndex*(sumxy*sumx4-sumx2y*sumx3)-sumy*(sumx*sumx4-sumx2*sumx3)+ | |
417 | sumx2*(sumx*sumx2y-sumx2*sumxy); | |
418 | Float_t detbz=currentIndex*(sumxz*sumx4-sumx2z*sumx3)-sumz*(sumx*sumx4-sumx2*sumx3)+ | |
419 | sumx2*(sumx*sumx2z-sumx2*sumxz); | |
420 | ||
421 | if (TMath::Abs(det)<0.00001){ | |
422 | tpcHit = (AliTPChit*)tpc->NextHit(); | |
423 | continue; | |
424 | } | |
425 | ||
426 | Float_t y=detay/det+centralPad; | |
427 | Float_t z=detaz/det; | |
428 | Float_t by=detby/det; //y angle | |
429 | Float_t bz=detbz/det; //z angle | |
430 | sumy/=Float_t(currentIndex); | |
431 | sumz/=Float_t(currentIndex); | |
432 | ||
433 | AliTPCClustersRow * row = (clustersArray->GetRow(isec,lastrow)); | |
434 | if (row!=0) { | |
435 | AliComplexCluster* cl = new((AliComplexCluster*)row->Append()) AliComplexCluster ; | |
436 | // AliComplexCluster cl; | |
437 | cl->fX=z; | |
438 | cl->fY=y; | |
439 | cl->fQ=sumq; | |
440 | cl->fSigmaX2=bz; | |
441 | cl->fSigmaY2=by; | |
442 | cl->fTracks[0]=ipart; | |
443 | } | |
444 | currentIndex=0; | |
445 | lastrow=currentrow; | |
446 | } //end of calculating cluster for given row | |
447 | ||
448 | ||
449 | tpcHit = (AliTPChit*)tpc->NextHit(); | |
450 | } // end of loop over hits | |
451 | } // end of loop over tracks | |
452 | //write padrows to tree | |
453 | for (Int_t ii=0; ii<param->GetNRow(isec);ii++) { | |
454 | clustersArray->StoreRow(isec,ii); | |
455 | clustersArray->ClearRow(isec,ii); | |
456 | } | |
457 | xxxx->Delete(); | |
458 | ||
459 | } | |
460 | ||
461 | ||
462 | void AliTPCFast::FindTrackHitsIntersection(AliRunLoader* runLoader, | |
463 | AliTPCClustersArray* clustersArray) const | |
464 | { | |
465 | ||
466 | // | |
467 | //fill clones array with intersection of current point with the | |
468 | //middle of the row | |
469 | AliLoader* loader = runLoader->GetLoader("TPCLoader"); | |
470 | if (!loader) { | |
471 | Error("FindTrackHitsIntersection", "No TPC loader found"); | |
472 | return; | |
473 | } | |
474 | if (!runLoader->GetAliRun()) runLoader->LoadgAlice(); | |
475 | AliRun* aliRun = runLoader->GetAliRun(); | |
476 | if (!aliRun) { | |
477 | Error("FindTrackHitsIntersection", "Couldn't get AliRun object"); | |
478 | return; | |
479 | } | |
480 | AliTPC* tpc = (AliTPC*) aliRun->GetDetector("TPC"); | |
481 | if (!tpc) { | |
482 | Error("FindTrackHitsIntersection", "Couldn't get TPC detector"); | |
483 | return; | |
484 | } | |
485 | AliTPCParam* param = tpc->GetParam(); | |
486 | if (!param) { | |
487 | Error("FindTrackHitsIntersection", "No TPC parameters available"); | |
488 | return; | |
489 | } | |
490 | ||
491 | Int_t sector; | |
492 | Int_t ipart; | |
493 | ||
494 | const Int_t kcmaxhits=30000; | |
495 | AliTPCFastVector * xxxx = new AliTPCFastVector(kcmaxhits*4); | |
496 | AliTPCFastVector & xxx = *xxxx; | |
497 | Int_t maxhits = kcmaxhits; | |
498 | ||
499 | // | |
500 | AliTPChit * tpcHit=0; | |
501 | tpcHit = (AliTPChit*)tpc->FirstHit2(-1); | |
502 | Int_t currentIndex=0; | |
503 | Int_t lastrow=-1; //last writen row | |
504 | ||
505 | while (tpcHit){ | |
506 | if (tpcHit==0) continue; | |
507 | sector=tpcHit->fSector; // sector number | |
508 | ipart=tpcHit->Track(); | |
509 | ||
510 | //find row number | |
511 | ||
512 | Float_t x[3]={tpcHit->X(),tpcHit->Y(),tpcHit->Z()}; | |
513 | Int_t index[3]={1,sector,0}; | |
514 | Int_t currentrow = param->GetPadRow(x,index) ; | |
515 | if (currentrow<0) continue; | |
516 | if (lastrow<0) lastrow=currentrow; | |
517 | if (currentrow==lastrow){ | |
518 | if ( currentIndex>=maxhits){ | |
519 | maxhits+=kcmaxhits; | |
520 | xxx.ResizeTo(4*maxhits); | |
521 | } | |
522 | xxx(currentIndex*4)=x[0]; | |
523 | xxx(currentIndex*4+1)=x[1]; | |
524 | xxx(currentIndex*4+2)=x[2]; | |
525 | xxx(currentIndex*4+3)=tpcHit->fQ; | |
526 | currentIndex++; | |
527 | } | |
528 | else | |
529 | if (currentIndex>2){ | |
530 | Float_t sumx=0; | |
531 | Float_t sumx2=0; | |
532 | Float_t sumx3=0; | |
533 | Float_t sumx4=0; | |
534 | Float_t sumy=0; | |
535 | Float_t sumxy=0; | |
536 | Float_t sumx2y=0; | |
537 | Float_t sumz=0; | |
538 | Float_t sumxz=0; | |
539 | Float_t sumx2z=0; | |
540 | Float_t sumq=0; | |
541 | for (Int_t index=0;index<currentIndex;index++){ | |
542 | Float_t x,x2,x3,x4; | |
543 | x=x2=x3=x4=xxx(index*4); | |
544 | x2*=x; | |
545 | x3*=x2; | |
546 | x4*=x3; | |
547 | sumx+=x; | |
548 | sumx2+=x2; | |
549 | sumx3+=x3; | |
550 | sumx4+=x4; | |
551 | sumy+=xxx(index*4+1); | |
552 | sumxy+=xxx(index*4+1)*x; | |
553 | sumx2y+=xxx(index*4+1)*x2; | |
554 | sumz+=xxx(index*4+2); | |
555 | sumxz+=xxx(index*4+2)*x; | |
556 | sumx2z+=xxx(index*4+2)*x2; | |
557 | sumq+=xxx(index*4+3); | |
558 | } | |
559 | Float_t centralPad = (param->GetNPads(sector,lastrow)-1)/2; | |
560 | Float_t det=currentIndex*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumx*sumx4-sumx2*sumx3)+ | |
561 | sumx2*(sumx*sumx3-sumx2*sumx2); | |
562 | ||
563 | Float_t detay=sumy*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxy*sumx4-sumx2y*sumx3)+ | |
564 | sumx2*(sumxy*sumx3-sumx2y*sumx2); | |
565 | Float_t detaz=sumz*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxz*sumx4-sumx2z*sumx3)+ | |
566 | sumx2*(sumxz*sumx3-sumx2z*sumx2); | |
567 | ||
568 | Float_t detby=currentIndex*(sumxy*sumx4-sumx2y*sumx3)-sumy*(sumx*sumx4-sumx2*sumx3)+ | |
569 | sumx2*(sumx*sumx2y-sumx2*sumxy); | |
570 | Float_t detbz=currentIndex*(sumxz*sumx4-sumx2z*sumx3)-sumz*(sumx*sumx4-sumx2*sumx3)+ | |
571 | sumx2*(sumx*sumx2z-sumx2*sumxz); | |
572 | ||
573 | Float_t y=detay/det+centralPad; | |
574 | Float_t z=detaz/det; | |
575 | Float_t by=detby/det; //y angle | |
576 | Float_t bz=detbz/det; //z angle | |
577 | sumy/=Float_t(currentIndex); | |
578 | sumz/=Float_t(currentIndex); | |
579 | ||
580 | AliComplexCluster cl; | |
581 | cl.fX=z; | |
582 | cl.fY=y; | |
583 | cl.fQ=sumq; | |
584 | cl.fSigmaX2=bz; | |
585 | cl.fSigmaY2=by; | |
586 | cl.fTracks[0]=ipart; | |
587 | ||
588 | AliTPCClustersRow * row = (clustersArray->GetRow(sector,lastrow)); | |
589 | if (row!=0) row->InsertCluster(&cl); | |
590 | currentIndex=0; | |
591 | lastrow=currentrow; | |
592 | } //end of calculating cluster for given row | |
593 | ||
594 | } // end of loop over hits | |
595 | xxxx->Delete(); | |
596 | ||
597 | } | |
598 |