Clean up to correct for the mess introduced by my eratic branching !
[u/mrichter/AliRoot.git] / PHOS / AliPHOSTrackSegmentMakerv1.cxx
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d15a28e7 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//_________________________________________________________________________
9f616d61 17// Algorithm class to construct track segments connection RecPoints in
18// EMCA and Ppsd. Unfolds also the clusters in EMCA.
19//*-- Author : D. Peressounko SUBATECH
d15a28e7 20//////////////////////////////////////////////////////////////////////////////
21
22// --- ROOT system ---
23
24#include "TObjArray.h"
25#include "TClonesArray.h"
9f616d61 26#include "TObjectTable.h"
d15a28e7 27
28// --- Standard library ---
29
9f616d61 30#include <iostream>
31#include <cassert>
d15a28e7 32
33// --- AliRoot header files ---
34
35#include "AliPHOSTrackSegmentMakerv1.h"
36#include "AliPHOSTrackSegment.h"
37#include "AliPHOSLink.h"
38#include "AliPHOSv0.h"
39#include "AliRun.h"
40
9f616d61 41extern void UnfoldingChiSquare(Int_t &NPar, Double_t *Grad, Double_t & fret, Double_t *x, Int_t iflag) ;
42
d15a28e7 43ClassImp( AliPHOSTrackSegmentMakerv1)
44
45
46//____________________________________________________________________________
9f616d61 47 AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1()
d15a28e7 48{
9f616d61 49 // ctor
d15a28e7 50 fR0 = 4. ;
51 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
52 //clusters are sorted in "rows" and "columns" of width geom->GetCrystalSize(0),
53 fDelta = fR0 + geom->GetCrystalSize(0) ;
9f616d61 54 fMinuit = new TMinuit(100) ;
d15a28e7 55}
56
57//____________________________________________________________________________
9f616d61 58 AliPHOSTrackSegmentMakerv1::~AliPHOSTrackSegmentMakerv1()
59{
60 // dtor
61 delete fMinuit ;
62}
63//____________________________________________________________________________
d15a28e7 64Bool_t AliPHOSTrackSegmentMakerv1::FindFit(AliPHOSEmcRecPoint * emcRP, int * maxAt, Float_t * maxAtEnergy,
9f616d61 65 Int_t NPar, Float_t * FitParameters)
66{
67 // gObjectTable->Print() ;
68 // Calls TMinuit for fitting cluster with several maxima
d15a28e7 69 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
9f616d61 70 assert( NPar < 100 ) ;
d15a28e7 71
9f616d61 72 gMinuit->SetPrintLevel(-1) ; // No Printout
73 gMinuit->SetFCN(UnfoldingChiSquare) ; // To set the address of the minimization function
74 gMinuit->SetObjectFit(emcRP) ; // To tranfer pointer to UnfoldingChiSquare
75
76 // filling initial values for fit parameters
d15a28e7 77 AliPHOSDigit * digit ;
9f616d61 78
79 Int_t ierflg = 0;
80 Int_t index = 0 ;
d15a28e7 81 Int_t NDigits = (Int_t) NPar / 3 ;
9f616d61 82
d15a28e7 83 Int_t iDigit ;
9f616d61 84
85
86 for(iDigit = 0 ; iDigit < NDigits ; iDigit++){
d15a28e7 87 digit = (AliPHOSDigit *) maxAt[iDigit];
88
89 Int_t RelId[4] ;
90 Float_t x ;
91 Float_t z ;
9f616d61 92 geom->AbsToRelNumbering(digit->GetId(), RelId) ;
93 geom->RelPosInModule(RelId, x, z) ;
d15a28e7 94
95 Float_t Energy = maxAtEnergy[iDigit] ;
96
9f616d61 97 gMinuit->mnparm(index, "x", x, 0.1, 0, 0, ierflg) ;
98 index++ ;
d15a28e7 99 if(ierflg != 0){
100 cout << "PHOS Unfolding> Unable to set initial value for fit procedure : x = " << x << endl ;
101 return kFALSE;
102 }
9f616d61 103 gMinuit->mnparm(index, "z", z, 0.1, 0, 0, ierflg) ;
104 index++ ;
d15a28e7 105 if(ierflg != 0){
106 cout << "PHOS Unfolding> Unable to set initial value for fit procedure : z = " << z << endl ;
107 return kFALSE;
108 }
9f616d61 109 gMinuit->mnparm(index, "Energy", Energy , 0.05*Energy, 0., 4.*Energy, ierflg) ;
110 index++ ;
d15a28e7 111 if(ierflg != 0){
112 cout << "PHOS Unfolding> Unable to set initial value for fit procedure : Energy = " << Energy << endl ;
113 return kFALSE;
114}
115 }
116
9f616d61 117 Double_t p0 = 0.1 ; // "Tolerance" Evaluation stops when EDM = 0.0001*p0 ; The number of function call slightly
118 // depends on it.
119 Double_t p1 = 1.0 ;
120 Double_t p2 = 0.0 ;
121
122 gMinuit->mnexcm("SET STR", &p2, 0, ierflg) ; // force TgMinuit to reduce function calls
123 gMinuit->mnexcm("SET GRA", &p1, 1, ierflg) ; // force TMinuit to use my gradient
d15a28e7 124 gMinuit->SetMaxIterations(5);
9f616d61 125 gMinuit->mnexcm("SET NOW", &p2 , 0, ierflg) ; // No Warnings
126 gMinuit->mnexcm("MIGRAD", &p0, 0, ierflg) ; // minimize
127 if(ierflg == 4){ // Minimum not found
128 cout << "PHOS Unfolding> Fit not converged, cluster abandoned "<< endl ;
d15a28e7 129 return kFALSE ;
130 }
131 for(index = 0; index < NPar; index++){
132 Double_t err ;
133 Double_t val ;
9f616d61 134 gMinuit->GetParameter(index, val, err) ; // Returns value and error of parameter index
135 FitParameters[index] = val ;
d15a28e7 136 }
d15a28e7 137 return kTRUE;
9f616d61 138
d15a28e7 139}
9f616d61 140
d15a28e7 141//____________________________________________________________________________
142void AliPHOSTrackSegmentMakerv1::FillOneModule(DigitsList * Dl, RecPointsList * emcIn, TObjArray * emcOut,
143 RecPointsList * ppsdIn, TObjArray * ppsdOutUp,
9f616d61 144 TObjArray * ppsdOutLow, Int_t & PHOSMod, Int_t & emcStopedAt,
d15a28e7 145 Int_t & ppsdStopedAt)
9f616d61 146{
147 // Unfold clusters and fill xxxOut arrays with clusters from one PHOS module
148
149 AliPHOSEmcRecPoint * emcRecPoint ;
d15a28e7 150 AliPHOSPpsdRecPoint * ppsdRecPoint ;
151 Int_t index ;
9f616d61 152 cout << "Fill 1" << endl ;
d15a28e7 153 Int_t NemcUnfolded = emcIn->GetEntries() ;
154 for(index = emcStopedAt; index < NemcUnfolded; index++){
d15a28e7 155 emcRecPoint = (AliPHOSEmcRecPoint *) (*emcIn)[index] ;
9f616d61 156 cout << "Fill 2" << endl ;
157
d15a28e7 158 if(emcRecPoint->GetPHOSMod() != PHOSMod )
9f616d61 159 break ;
160
d15a28e7 161
162 Int_t NMultipl = emcRecPoint->GetMultiplicity() ;
163 int maxAt[NMultipl] ;
164 Float_t maxAtEnergy[NMultipl] ;
9f616d61 165 Int_t Nmax = emcRecPoint->GetNumberOfLocalMax(maxAt, maxAtEnergy) ;
166
167
d15a28e7 168
9f616d61 169 if(Nmax <= 1) // if cluster is very flat, so that no prononsed maximum, then Nmax = 0
d15a28e7 170 emcOut->Add(emcRecPoint) ;
171 else {
172 UnfoldClusters(Dl, emcIn, emcRecPoint, Nmax, maxAt, maxAtEnergy, emcOut) ;
173 emcIn->Remove(emcRecPoint);
9f616d61 174 cout << "Fill 3" << endl ;
d15a28e7 175 emcIn->Compress() ;
176 NemcUnfolded-- ;
177 index-- ;
178 }
179 }
180 emcStopedAt = index ;
181
182 for(index = ppsdStopedAt; index < ppsdIn->GetEntries(); index++){
183 ppsdRecPoint = (AliPHOSPpsdRecPoint *) (*ppsdIn)[index] ;
9f616d61 184 if(ppsdRecPoint->GetPHOSMod() != PHOSMod )
185 break ;
d15a28e7 186 if(ppsdRecPoint->GetUp() )
187 ppsdOutUp->Add(ppsdRecPoint) ;
188 else
189 ppsdOutLow->Add(ppsdRecPoint) ;
190 }
191 ppsdStopedAt = index ;
192
193 PHOSMod ++ ;
194
195 emcOut->Sort() ;
196 ppsdOutUp->Sort() ;
197 ppsdOutLow->Sort() ;
198
199}
200//____________________________________________________________________________
201Float_t AliPHOSTrackSegmentMakerv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * EmcClu,AliPHOSPpsdRecPoint * PpsdClu, Bool_t &TooFar)
202{
203 Float_t R = fR0 ;
204
205 TVector3 vecEmc ;
206 TVector3 vecPpsd ;
207
208 EmcClu->GetLocalPosition(vecEmc) ;
209 PpsdClu->GetLocalPosition(vecPpsd) ;
210 if(EmcClu->GetPHOSMod() == PpsdClu->GetPHOSMod()){
211 if(vecPpsd.X() >= vecEmc.X() - fDelta ){
212 if(vecPpsd.Z() >= vecEmc.Z() - fDelta ){
213 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
214 //Correct to difference in CPV and EMC position due to different distance to center.
215 //we assume, that particle moves from center
216 Float_t DCPV = geom->GetIPtoOuterCoverDistance();
217 Float_t DEMC = geom->GetIPtoCrystalSurface() ;
218 DEMC = DEMC / DCPV ;
219 vecPpsd = DEMC * vecPpsd - vecEmc ;
220 R = vecPpsd.Mag() ;
221 } // if zPpsd >= zEmc - fDelta
222 TooFar = kFALSE ;
223 } // if xPpsd >= xEmc - fDelta
224 else
225 TooFar = kTRUE ;
226 }
227 else
228 TooFar = kTRUE ;
229
230 return R ;
231}
232
233//____________________________________________________________________________
234void AliPHOSTrackSegmentMakerv1::MakeLinks(TObjArray * EmcRecPoints, TObjArray * PpsdRecPointsUp,
235 TObjArray * PpsdRecPointsLow, TClonesArray * LinkLowArray,
236 TClonesArray *LinkUpArray)
237{
238 //Finds distanses (links) between all EMC and PPSD clusters, which are not further from each other than fR0
239
240 TIter nextEmc(EmcRecPoints) ;
241 Int_t iEmcClu = 0 ;
242
243 AliPHOSPpsdRecPoint * PpsdLow ;
244 AliPHOSPpsdRecPoint * PpsdUp ;
245 AliPHOSEmcRecPoint * EmcClu ;
246
247 Int_t iLinkLow = 0 ;
248 Int_t iLinkUp = 0 ;
249
250 while( (EmcClu = (AliPHOSEmcRecPoint*)nextEmc() ) ) {
251 Bool_t TooFar ;
252 TIter nextPpsdLow(PpsdRecPointsLow ) ;
253 Int_t iPpsdLow = 0 ;
254
255 while( (PpsdLow = (AliPHOSPpsdRecPoint*)nextPpsdLow() ) ) {
256 Float_t R = GetDistanceInPHOSPlane(EmcClu, PpsdLow, TooFar) ;
257
258 if(TooFar)
259 break ;
260 if(R < fR0)
261 new( (*LinkLowArray)[iLinkLow++]) AliPHOSLink(R, iEmcClu, iPpsdLow) ;
262
263 iPpsdLow++ ;
264
265 }
266
267 TIter nextPpsdUp(PpsdRecPointsUp ) ;
268 Int_t iPpsdUp = 0 ;
269
270 while( (PpsdUp = (AliPHOSPpsdRecPoint*)nextPpsdUp() ) ) {
271 Float_t R = GetDistanceInPHOSPlane(EmcClu, PpsdUp, TooFar) ;
272
273 if(TooFar)
274 break ;
275 if(R < fR0)
276 new( (*LinkUpArray)[iLinkUp++]) AliPHOSLink(R, iEmcClu, iPpsdUp) ;
277
278 iPpsdUp++ ;
279
280 }
281
282 iEmcClu++ ;
283
284 } // while nextEmC
285
286 LinkLowArray->Sort() ; //first links with smallest distances
287 LinkUpArray->Sort() ;
288}
289
290//____________________________________________________________________________
291void AliPHOSTrackSegmentMakerv1::MakePairs(TObjArray * EmcRecPoints, TObjArray * PpsdRecPointsUp,
292 TObjArray * PpsdRecPointsLow, TClonesArray * LinkLowArray,
293 TClonesArray * LinkUpArray, TrackSegmentsList * trsl)
294{ // Finds the smallest links and makes pairs of PPSD and EMC clusters with smallest distance
295 TIter nextLow(LinkLowArray) ;
296 TIter nextUp(LinkUpArray) ;
297
298 AliPHOSLink * linkLow ;
299 AliPHOSLink * linkUp ;
300
301 AliPHOSEmcRecPoint * emc ;
302 AliPHOSPpsdRecPoint * ppsdLow ;
303 AliPHOSPpsdRecPoint * ppsdUp ;
304
9f616d61 305 AliPHOSRecPoint * NullPointer = 0 ;
306
d15a28e7 307 while ( (linkLow = (AliPHOSLink *)nextLow() ) ){
308 emc = (AliPHOSEmcRecPoint *) EmcRecPoints->At(linkLow->GetEmc()) ;
309 ppsdLow = (AliPHOSPpsdRecPoint *) PpsdRecPointsLow->At(linkLow->GetPpsd()) ;
310 if((emc)&&(ppsdLow)){ // RecPoints not removed yet
311 ppsdUp = 0 ;
312
313 while ( (linkUp = (AliPHOSLink *)nextUp() ) ){
314 if(linkLow->GetEmc() == linkUp->GetEmc() ){
315 ppsdUp = (AliPHOSPpsdRecPoint *) PpsdRecPointsUp->At(linkUp->GetPpsd()) ;
316 break ;
317 }
318
319 } // while nextUp
320
321 nextUp.Reset();
322 AliPHOSTrackSegment * subtr = new AliPHOSTrackSegment(emc, ppsdUp, ppsdLow ) ;
323 trsl->Add(subtr) ;
9f616d61 324 EmcRecPoints->AddAt(NullPointer,linkLow->GetEmc()) ;
325 PpsdRecPointsLow->AddAt(NullPointer,linkLow->GetPpsd()) ;
d15a28e7 326
327 if(ppsdUp)
9f616d61 328 PpsdRecPointsUp->AddAt(NullPointer,linkUp->GetPpsd()) ;
d15a28e7 329
330 } // if NLocMax
331 }
332
333 TIter nextEmc(EmcRecPoints) ;
334 nextEmc.Reset() ;
335
336 while( (emc = (AliPHOSEmcRecPoint*)nextEmc()) ){ //to create pairs if no PpsdLow
9f616d61 337 ppsdLow = 0 ;
338 ppsdUp = 0 ;
d15a28e7 339
340 while ( (linkUp = (AliPHOSLink *)nextUp() ) ){
341
342 if(EmcRecPoints->IndexOf(emc) == linkUp->GetEmc() ){
343 ppsdUp = (AliPHOSPpsdRecPoint *) PpsdRecPointsUp->At(linkUp->GetPpsd()) ;
344 break ;
345 }
346
347 }
348 AliPHOSTrackSegment * subtr = new AliPHOSTrackSegment(emc, ppsdUp, ppsdLow ) ;
349 trsl->Add(subtr) ;
350
351 if(ppsdUp)
9f616d61 352 PpsdRecPointsUp->AddAt(NullPointer,linkUp->GetPpsd()) ;
d15a28e7 353 }
354
355}
356
357//____________________________________________________________________________
358void AliPHOSTrackSegmentMakerv1::MakeTrackSegments(DigitsList * DL, RecPointsList * emcl,
359 RecPointsList * ppsdl, TrackSegmentsList * trsl)
360{
9f616d61 361 // main function, does the job
d15a28e7 362
9f616d61 363 Int_t PHOSMod = 1 ;
364 Int_t emcStopedAt = 0 ;
d15a28e7 365 Int_t ppsdStopedAt = 0 ;
366
9f616d61 367 TObjArray * EmcRecPoints = new TObjArray(100) ; // these arrays keep pointers
368 TObjArray * PpsdRecPointsUp = new TObjArray(100) ; // to RecPoints, which are
369 TObjArray * PpsdRecPointsLow = new TObjArray(100) ; // kept in TClonesArray's emcl and ppsdl
d15a28e7 370
371
372 TClonesArray * LinkLowArray = new TClonesArray("AliPHOSLink", 100);
373 TClonesArray * LinkUpArray = new TClonesArray("AliPHOSLink", 100);
374
375 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
376
377 while(PHOSMod <= geom->GetNModules() ){
9f616d61 378
379 cout << PHOSMod << " Track1 " << endl ;
d15a28e7 380
381 FillOneModule(DL, emcl, EmcRecPoints, ppsdl, PpsdRecPointsUp, PpsdRecPointsLow, PHOSMod , emcStopedAt, ppsdStopedAt) ;
9f616d61 382 cout << PHOSMod << " Track2 " << endl ;
383 MakeLinks(EmcRecPoints, PpsdRecPointsUp, PpsdRecPointsLow, LinkLowArray, LinkUpArray) ;
d15a28e7 384
9f616d61 385 cout << PHOSMod << " Track3 " << endl ;
386 MakePairs(EmcRecPoints, PpsdRecPointsUp, PpsdRecPointsLow, LinkLowArray, LinkUpArray, trsl) ;
d15a28e7 387
388 EmcRecPoints->Clear() ;
9f616d61 389
d15a28e7 390 PpsdRecPointsUp->Clear() ;
9f616d61 391
d15a28e7 392 PpsdRecPointsLow->Clear() ;
9f616d61 393
394 LinkUpArray->Clear();
395
396 LinkLowArray->Clear();
397
d15a28e7 398 }
9f616d61 399 delete EmcRecPoints ;
400 EmcRecPoints = 0 ;
401
402 delete PpsdRecPointsUp ;
403 PpsdRecPointsUp = 0 ;
404
405 delete PpsdRecPointsLow ;
406 PpsdRecPointsLow = 0 ;
407
408 delete LinkUpArray ;
409 LinkUpArray = 0 ;
410
411 delete LinkLowArray ;
412 LinkLowArray = 0 ;
d15a28e7 413}
414
415//____________________________________________________________________________
9f616d61 416Double_t AliPHOSTrackSegmentMakerv1::ShowerShape(Double_t r)
417{
d15a28e7 418// If you change this function, change also gradiend evaluation in ChiSquare()
419 Double_t r4 = r*r*r*r ;
420 Double_t r295 = TMath::Power(r, 2.95) ;
421 Double_t shape = TMath::Exp( -r4 * (1. / (2.32 + 0.26 * r4) + 0.0316 / (1 + 0.0652 * r295) ) ) ;
422 return shape ;
423}
424
425//____________________________________________________________________________
426void AliPHOSTrackSegmentMakerv1::UnfoldClusters(DigitsList * DL, RecPointsList * emcIn, AliPHOSEmcRecPoint * iniEmc,
427 Int_t Nmax, int * maxAt, Float_t * maxAtEnergy, TObjArray * emcList)
428{
9f616d61 429 // fits cluster with Nmax overlapping showers
d15a28e7 430
431 Int_t NPar = 3 * Nmax ;
432 Float_t FitParameters[NPar] ;
433 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
9f616d61 434
435 Bool_t rv = FindFit(iniEmc, maxAt, maxAtEnergy, NPar, FitParameters) ;
436 if( !rv ) // Fit failed, return and remove cluster
d15a28e7 437 return ;
438
439 Float_t xDigit ;
440 Float_t zDigit ;
441 Int_t RelId[4] ;
442
443 Int_t Ndigits = iniEmc->GetMultiplicity() ;
444 Float_t xpar ;
445 Float_t zpar ;
446 Float_t Epar ;
447 Float_t Distance ;
448 Float_t Ratio ;
449 Float_t Efit[Ndigits] ;
450 Int_t iparam ;
451 Int_t iDigit ;
452
453 AliPHOSDigit * digit ;
454 AliPHOSEmcRecPoint * emcRP ;
455 int * emcDigits = iniEmc->GetDigitsList() ;
456 Float_t * emcEnergies = iniEmc->GetEnergiesList() ;
457
458 Int_t iRecPoint = emcIn->GetEntries() ;
459
460 for(iDigit = 0 ; iDigit < Ndigits ; iDigit ++){
461 digit = (AliPHOSDigit *) emcDigits[iDigit];
462 geom->AbsToRelNumbering(digit->GetId(), RelId) ;
463 geom->RelPosInModule(RelId, xDigit, zDigit) ;
464 Efit[iDigit] = 0;
465 iparam = 0 ;
466
467 while(iparam < NPar ){
468 xpar = FitParameters[iparam] ;
469 zpar = FitParameters[iparam+1] ;
470 Epar = FitParameters[iparam+2] ;
471 iparam += 3 ;
472 Distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ;
473 Distance = TMath::Sqrt(Distance) ;
474 Efit[iDigit] += Epar * ShowerShape(Distance) ;
475 }
476
477 }
478
479 iparam = 0 ;
480 Float_t eDigit ;
481
482 while(iparam < NPar ){
483 xpar = FitParameters[iparam] ;
484 zpar = FitParameters[iparam+1] ;
485 Epar = FitParameters[iparam+2] ;
486 iparam += 3 ;
487 new ((*emcIn)[iRecPoint]) AliPHOSEmcRecPoint( iniEmc->GetLogWeightCut(), iniEmc->GetLocMaxCut() ) ;
488 emcRP = (AliPHOSEmcRecPoint *) emcIn->At(iRecPoint++);
489
490 for(iDigit = 0 ; iDigit < Ndigits ; iDigit ++){
491 digit = (AliPHOSDigit *) emcDigits[iDigit];
492 geom->AbsToRelNumbering(digit->GetId(), RelId) ;
493 geom->RelPosInModule(RelId, xDigit, zDigit) ;
494 Distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ;
495 Distance = TMath::Sqrt(Distance) ;
496 Ratio = Epar * ShowerShape(Distance) / Efit[iDigit] ;
497 eDigit = emcEnergies[iDigit] * Ratio ;
9f616d61 498 emcRP->AddDigit( *digit, eDigit ) ;
d15a28e7 499 }
500
501 emcList->Add(emcRP) ;
502
503 }
504}
505//______________________________________________________________________________
9f616d61 506void UnfoldingChiSquare(Int_t &NPar, Double_t *Grad, Double_t & fret, Double_t *x, Int_t iflag)
d15a28e7 507{
9f616d61 508
509// Number of paramters, Gradient , Chi squared, parameters, what to do
510
d15a28e7 511 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
d15a28e7 512
9f616d61 513 AliPHOSEmcRecPoint * emcRP = (AliPHOSEmcRecPoint *) gMinuit->GetObjectFit() ; // EmcRecPoint to fit
d15a28e7 514 int * emcDigits = emcRP->GetDigitsList() ;
515 Float_t * emcEnergies = emcRP->GetEnergiesList() ;
516 fret = 0. ;
517 Int_t iparam ;
518
9f616d61 519 if(iflag == 2)
520 for(iparam = 0 ; iparam < NPar ; iparam++)
521 Grad[iparam] = 0 ; // Will evaluate gradient
522
d15a28e7 523 Double_t Efit ;
9f616d61 524
d15a28e7 525 AliPHOSDigit * digit ;
526 Int_t iDigit = 0 ;
9f616d61 527
d15a28e7 528 while ( (digit = (AliPHOSDigit *)emcDigits[iDigit] )){
529 Int_t RelId[4] ;
530 Float_t xDigit ;
531 Float_t zDigit ;
532 geom->AbsToRelNumbering(digit->GetId(), RelId) ;
533 geom->RelPosInModule(RelId, xDigit, zDigit) ;
534
9f616d61 535 if(iflag == 2){ // calculate gradient
536 Int_t iParam = 0 ;
537 Efit = 0 ;
538 while(iParam < NPar ){
539 Double_t Distance = (xDigit - x[iParam]) * (xDigit - x[iParam]) ;
540 iParam++ ;
541 Distance += (zDigit - x[iParam]) * (zDigit - x[iParam]) ;
542 Distance = TMath::Sqrt( Distance ) ;
543 iParam++ ;
544 Efit += x[iParam] * AliPHOSTrackSegmentMakerv1::ShowerShape(Distance) ;
545 iParam++ ;
546 }
547 Double_t sum = 2. * (Efit - emcEnergies[iDigit]) / emcEnergies[iDigit] ; // Here we assume, that sigma = sqrt(E)
548 iParam = 0 ;
549 while(iParam < NPar ){
550 Double_t xpar = x[iParam] ;
551 Double_t zpar = x[iParam+1] ;
552 Double_t Epar = x[iParam+2] ;
553 Double_t dr = TMath::Sqrt( (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) );
554 Double_t shape = sum * AliPHOSTrackSegmentMakerv1::ShowerShape(dr) ;
555 Double_t r4 = dr*dr*dr*dr ;
556 Double_t r295 = TMath::Power(dr,2.95) ;
557 Double_t deriv =-4. * dr*dr * ( 2.32 / ( (2.32 + 0.26 * r4) * (2.32 + 0.26 * r4) ) +
558 0.0316 * (1. + 0.0171 * r295) / ( ( 1. + 0.0652 * r295) * (1. + 0.0652 * r295) ) ) ;
559
560 Grad[iParam] += Epar * shape * deriv * (xpar - xDigit) ; // Derivative over x
561 iParam++ ;
562 Grad[iParam] += Epar * shape * deriv * (zpar - zDigit) ; // Derivative over z
563 iParam++ ;
564 Grad[iParam] += shape ; // Derivative over energy
565 iParam++ ;
566 }
567 }
568 Efit = 0;
569 iparam = 0 ;
570 while(iparam < NPar ){
571 Double_t xpar = x[iparam] ;
572 Double_t zpar = x[iparam+1] ;
573 Double_t Epar = x[iparam+2] ;
574 iparam += 3 ;
575 Double_t Distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ;
576 Distance = TMath::Sqrt(Distance) ;
577 Efit += Epar * AliPHOSTrackSegmentMakerv1::ShowerShape(Distance) ;
578 }
579 fret += (Efit-emcEnergies[iDigit])*(Efit-emcEnergies[iDigit])/emcEnergies[iDigit] ;
580 // Here we assume, that sigma = sqrt(E)
581 iDigit++ ;
d15a28e7 582 }
583}