[u/mrichter/AliRoot.git] / RICH / AliRICHClusterFinder.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/


#include "AliRICHClusterFinder.h"
#include "AliRICHMap.h"
#include <TMinuit.h>
#include <TParticle.h>
#include <TVector3.h>
#include <AliLoader.h>
#include <AliStack.h>
#include <AliRun.h>

void RICHMinMathieson(Int_t &npar, Double_t *gin, Double_t &chi2, Double_t *par, Int_t iflag);

ClassImp(AliRICHClusterFinder)
//__________________________________________________________________________________________________
AliRICHClusterFinder::AliRICHClusterFinder(AliRICH *pRICH)   
{//main ctor
  Info("main ctor","Start.");
  
  fRICH = pRICH;
  
  fHitMap = 0;  
  
}//main ctor
//__________________________________________________________________________________________________
void AliRICHClusterFinder::FindLocalMaxima()
{// Split the cluster according to the number of maxima inside
  Info("FindLocalMaxima","Start.");
  Int_t Nlocal = 0;
  Int_t localX[100],localY[100];
  for(Int_t iDig1=0;iDig1<fCurrentCluster.Size();iDig1++) {
    Int_t iNotMax = 0;
    AliRICHdigit *pDig1 = (AliRICHdigit *)fCurrentCluster.Digits()->At(iDig1);
    Int_t padX1 = pDig1->X();
    Int_t padY1 = pDig1->Y();
    Double_t padQ1 = pDig1->Q();
    for(Int_t iDig2=0;iDig2<fCurrentCluster.Size();iDig2++) {
      AliRICHdigit *pDig2 = (AliRICHdigit *)fCurrentCluster.Digits()->At(iDig2);
      Int_t padX2 = pDig2->X();
      Int_t padY2 = pDig2->Y();
      Double_t padQ2 = pDig2->Q();
      if(iDig1==iDig2) continue;
      Int_t diffx = TMath::Sign(padX1-padX2,1);
      Int_t diffy = TMath::Sign(padY1-padY2,1);
      if((diffx+diffy)<=1) {
         if(padQ2>padQ1) iNotMax++;
      }
    }
    if(iNotMax==0) {
    localX[Nlocal] = padX1;
    localY[Nlocal] = padY1;
    Nlocal++;
    }
  }   
}//FindLocalMaxima()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::Exec()
{
  Info("Exec","Start.");
  
  
  Rich()->GetLoader()->LoadDigits(); 
  
  Rich()->GetLoader()->GetRunLoader()->LoadHeader();
  Rich()->GetLoader()->GetRunLoader()->LoadKinematics();

  for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
    gAlice->GetRunLoader()->GetEvent(iEventN);
    
    Rich()->GetLoader()->MakeTree("R");  Rich()->MakeBranch("R");
    Rich()->ResetDigits();  Rich()->ResetClusters();
    
    Rich()->GetLoader()->TreeD()->GetEntry(0);
    for(Int_t iChamber=1;iChamber<=kNCH;iChamber++){//chambers loop
      FindClusters(iChamber);
    }//chambers loop
    Rich()->GetLoader()->TreeR()->Fill();
    Rich()->GetLoader()->WriteRecPoints("OVERWRITE");
  }//events loop  
  Rich()->GetLoader()->UnloadDigits(); Rich()->GetLoader()->UnloadRecPoints();  
  Rich()->ResetDigits();  Rich()->ResetClusters();
  
  Rich()->GetLoader()->GetRunLoader()->UnloadHeader();
  Rich()->GetLoader()->GetRunLoader()->UnloadKinematics();

  Info("Exec","Stop.");      
}//Exec()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::FindClusters(Int_t iChamber)
{
  //finds neighbours and fill the tree with raw clusters
  Int_t nDigits=Rich()->Digits(iChamber)->GetEntriesFast();
  Info("FindClusters","Start for Chamber %i with %i digits.",iChamber,nDigits);  
  if(nDigits==0)return;

  fHitMap=new AliRICHMap(Rich()->Digits(iChamber));//create digit map for the given chamber

  for(Int_t iDig=0;iDig<nDigits;iDig++){    
    AliRICHdigit *dig=(AliRICHdigit*)Rich()->Digits(iChamber)->At(iDig);
    Int_t i=dig->X();   Int_t j=dig->Y();
    if(fHitMap->TestHit(i,j)==kUsed) continue;
	
    FormRawCluster(i,j);
	
    if(AliRICHParam::IsResolveClusters()) {
      ResolveCluster(); // ResolveCluster serialization will happen inside
    } else {
      WriteRawCluster(); // simply output of the RawCluster found without deconvolution
    }
    fCurrentCluster.Reset();
  }//digits loop

  delete fHitMap;
  Info("FindClusters","Stop.");
  
}//FindClusters()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::FindClusterContribs()
{
  //finds CombiPid for a given cluster
  Info("FindClusterContribs","Start");
  
  TObjArray *pDigits = fCurrentCluster.Digits();
  Int_t iNmips=0,iNckovs=0,iNfeeds=0;
  TArrayI contribs(3*fCurrentCluster.Size());
  Int_t *pindex = new Int_t[3*fCurrentCluster.Size()];
  for(Int_t iDigN=0;iDigN<fCurrentCluster.Size();iDigN++) {//loop on digits of a given cluster
    contribs[3*iDigN]  =((AliRICHdigit*)pDigits->At(iDigN))->Tid(0);
    contribs[3*iDigN+1]=((AliRICHdigit*)pDigits->At(iDigN))->Tid(1);
    contribs[3*iDigN+2]=((AliRICHdigit*)pDigits->At(iDigN))->Tid(2);
    cout << "TID1 " << contribs[3*iDigN] << " TID2 " << contribs[3*iDigN+1] << " TID3 " << contribs[3*iDigN+2] << endl;
  }//loop on digits of a given cluster
  TMath::Sort(contribs.GetSize(),contribs.GetArray(),pindex);
  for(Int_t iDigN=0;iDigN<3*fCurrentCluster.Size()-1;iDigN++) {//loop on digits to sort Tid
    cout << " contrib " << contribs[pindex[iDigN]] << " digit " << iDigN << 
            " contrib " << contribs[pindex[iDigN+1]] << " digit " << iDigN+1 << endl;
    if(contribs[pindex[iDigN]]!=contribs[pindex[iDigN+1]]) {
      Int_t code   = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPdgCode();
      Double_t charge = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPDG()->Charge();

      if(code==50000050) iNckovs++;
      else if(code==50000051) iNfeeds++;
      else if(charge!=0) iNmips++;
      if (contribs[pindex[iDigN+1]]==kBad) break;
    }
  }//loop on digits to sort Tid
  fCurrentCluster.SetCombiPid(iNckovs,iNfeeds,iNmips);
  fCurrentCluster.Print();
  delete [] pindex; 
}// FindClusterContribs()
//__________________________________________________________________________________________________
void  AliRICHClusterFinder::FormRawCluster(Int_t i, Int_t j)
{
  // Builder of the final Raw Cluster (before deconvolution)  
  Info("FormRawCluster","Start with digit(%i,%i)",i,j);
  
  fCurrentCluster.AddDigit((AliRICHdigit*) fHitMap->GetHit(i,j));
  fHitMap->FlagHit(i,j);// Flag hit as taken  

  Int_t listX[4], listY[4];    //  Now look recursively for all neighbours
  for (Int_t iNeighbour=0;iNeighbour<Rich()->Param()->PadNeighbours(i,j,listX,listY);iNeighbour++)
    if(fHitMap->TestHit(listX[iNeighbour],listY[iNeighbour])==kUnused) 
                      FormRawCluster(listX[iNeighbour],listY[iNeighbour]);    
}//AddDigit2Cluster()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::ResolveCluster()
{// Decluster algorithm
  Info("ResolveCluster","Start.");    

  fCurrentCluster.CoG(); // first initial approxmation of the CoG...to start minimization.
  fCurrentCluster.Print();
  switch (fCurrentCluster.Size()) {
  
  case 1:
    WriteRawCluster(); break;
  case 2:
    FitCoG();
    WriteRawCluster(); break;
    
  default:
    WriteRawCluster(); break;
  }     
}//ResolveCluster()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::WriteRawCluster()
{// out the current RawCluster
  Info("WriteRawCluster","Start.");
  
  FindClusterContribs();
  Rich()->AddCluster(fCurrentCluster);
  
}//WriteRawCluster()
//__________________________________________________________________________________________________
void AliRICHClusterFinder::FitCoG()
{// Fit cluster size 2 by single Mathieson
  Info("FitCoG","Start.");
  
  TMinuit *pMinuit = new TMinuit(2);
  
  Double_t arglist;
  Int_t ierflag = 0;

  static Double_t vstart[2];
  static Double_t lower[2], upper[2];
  static Double_t step[2]={0.001,0.001};

  TString chname;
  Int_t ierflg;
  
  pMinuit->SetObjectFit((TObject*)this);
  pMinuit->SetFCN(RICHMinMathieson);
  pMinuit->mninit(5,10,7);

  vstart[0] = fCurrentCluster.X();
  vstart[1] = fCurrentCluster.Y();

  lower[0] = vstart[0] - 2*AliRICHParam::PadSizeX();
  upper[0] = vstart[0] + 2*AliRICHParam::PadSizeX();
  lower[1] = vstart[1] - 2*AliRICHParam::PadSizeY();
  upper[1] = vstart[1] + 2*AliRICHParam::PadSizeY();


  pMinuit->mnparm(0," x position ",vstart[0],step[0],lower[0],upper[0],ierflag);
  pMinuit->mnparm(1," y position ",vstart[1],step[1],lower[1],upper[1],ierflag);

  arglist = -1;

  pMinuit->SetPrintLevel(-1);
  pMinuit->mnexcm("SET NOGR",&arglist, 1, ierflag);
  pMinuit->mnexcm("SET NOW",&arglist, 1, ierflag);
  arglist = 1;
  pMinuit->mnexcm("SET ERR", &arglist, 1,ierflg);
  arglist = -1;
  pMinuit->mnexcm("SIMPLEX",&arglist, 0, ierflag);
  pMinuit->mnexcm("MIGRAD",&arglist, 0, ierflag);
  pMinuit->mnexcm("EXIT" ,&arglist, 0, ierflag);  
  Double_t xCoG,yCoG;
  Double_t eps, b1, b2;
  pMinuit->mnpout(0,chname, xCoG, eps , b1, b2, ierflg);
  pMinuit->mnpout(1,chname, yCoG, eps , b1, b2, ierflg);
  delete pMinuit;
}
//__________________________________________________________________________________________________
void RICHMinMathieson(Int_t &, Double_t *, Double_t &chi2, Double_t *par, Int_t iflag)
{// Minimization function of Mathieson
  
  AliRICHcluster *pRawCluster = ((AliRICHClusterFinder*)gMinuit->GetObjectFit())->GetCurrentCluster();

  TVector3 centroid(par[0],par[1],0);
  
  chi2 = 0;
  Int_t qtot = pRawCluster->Q();
  for(Int_t i=0;i<pRawCluster->Size();i++) {
    Int_t    padX = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->X();
    Int_t    padY = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Y();
    Double_t padQ = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Q();
     chi2 += TMath::Power((qtot*AliRICHParam::Loc2PadFrac(centroid,padX,padY)-padQ),2)/padQ;
  }   
  if(iflag == 3)
    {
            cout << " --- end convergence...summary --- " << endl;
            cout << " x position " << par[0] << endl;
            cout << " y position " << par[1] << endl;
            cout << " chi2       " << chi2 << endl;
    }
}//RICHMinMathieson()
Commit	Line	Data
8265fa96	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
8265fa96	16
8265fa96	17	#include "AliRICHClusterFinder.h"
543d5224	18	#include "AliRICHMap.h"
9d6f9427	19	#include <TMinuit.h>
ed3ceb24	20	#include <TParticle.h>
9d6f9427	21	#include <TVector3.h>
cbaf35fb	22	#include <AliLoader.h>
ed3ceb24	23	#include <AliStack.h>
cbaf35fb	24	#include <AliRun.h>
8265fa96	25
9d6f9427	26	void RICHMinMathieson(Int_t &npar, Double_t gin, Double_t &chi2, Double_t par, Int_t iflag);
8265fa96	27
8265fa96	28	ClassImp(AliRICHClusterFinder)
543d5224	29	//__________________________________________________________________________________________________
	30	AliRICHClusterFinder::AliRICHClusterFinder(AliRICH *pRICH)
	31	{//main ctor
	32	Info("main ctor","Start.");
	33
cbaf35fb	34	fRICH = pRICH;
543d5224	35
cbaf35fb	36	fHitMap = 0;
543d5224	37
543d5224	38	}//main ctor
543d5224	39	//__________________________________________________________________________________________________
9d6f9427	40	void AliRICHClusterFinder::FindLocalMaxima()
543d5224	41	{// Split the cluster according to the number of maxima inside
9d6f9427	42	Info("FindLocalMaxima","Start.");
cbaf35fb	43	Int_t Nlocal = 0;
cbaf35fb	44	Int_t localX[100],localY[100];
9d6f9427	45	for(Int_t iDig1=0;iDig1<fCurrentCluster.Size();iDig1++) {
cbaf35fb	46	Int_t iNotMax = 0;
9d6f9427	47	AliRICHdigit pDig1 = (AliRICHdigit )fCurrentCluster.Digits()->At(iDig1);
cbaf35fb	48	Int_t padX1 = pDig1->X();
	49	Int_t padY1 = pDig1->Y();
	50	Double_t padQ1 = pDig1->Q();
9d6f9427	51	for(Int_t iDig2=0;iDig2<fCurrentCluster.Size();iDig2++) {
9d6f9427	52	AliRICHdigit pDig2 = (AliRICHdigit )fCurrentCluster.Digits()->At(iDig2);
cbaf35fb	53	Int_t padX2 = pDig2->X();
	54	Int_t padY2 = pDig2->Y();
	55	Double_t padQ2 = pDig2->Q();
	56	if(iDig1==iDig2) continue;
	57	Int_t diffx = TMath::Sign(padX1-padX2,1);
	58	Int_t diffy = TMath::Sign(padY1-padY2,1);
	59	if((diffx+diffy)<=1) {
	60	if(padQ2>padQ1) iNotMax++;
	61	}
8265fa96	62	}
cbaf35fb	63	if(iNotMax==0) {
	64	localX[Nlocal] = padX1;
	65	localY[Nlocal] = padY1;
	66	Nlocal++;
8265fa96	67	}
cbaf35fb	68	}
cbaf35fb	69	}//FindLocalMaxima()
543d5224	70	//__________________________________________________________________________________________________
543d5224	71	void AliRICHClusterFinder::Exec()
237c933d	72	{
543d5224	73	Info("Exec","Start.");
543d5224	74
cbaf35fb	75
543d5224	76	Rich()->GetLoader()->LoadDigits();
543d5224	77
ed3ceb24	78	Rich()->GetLoader()->GetRunLoader()->LoadHeader();
	79	Rich()->GetLoader()->GetRunLoader()->LoadKinematics();
	80
543d5224	81	for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
543d5224	82	gAlice->GetRunLoader()->GetEvent(iEventN);
237c933d	83
543d5224	84	Rich()->GetLoader()->MakeTree("R"); Rich()->MakeBranch("R");
cbaf35fb	85	Rich()->ResetDigits(); Rich()->ResetClusters();
543d5224	86
543d5224	87	Rich()->GetLoader()->TreeD()->GetEntry(0);
cbaf35fb	88	for(Int_t iChamber=1;iChamber<=kNCH;iChamber++){//chambers loop
ed3ceb24	89	FindClusters(iChamber);
543d5224	90	}//chambers loop
543d5224	91	Rich()->GetLoader()->TreeR()->Fill();
	92	Rich()->GetLoader()->WriteRecPoints("OVERWRITE");
	93	}//events loop
	94	Rich()->GetLoader()->UnloadDigits(); Rich()->GetLoader()->UnloadRecPoints();
cbaf35fb	95	Rich()->ResetDigits(); Rich()->ResetClusters();
ed3ceb24	96
	97	Rich()->GetLoader()->GetRunLoader()->UnloadHeader();
	98	Rich()->GetLoader()->GetRunLoader()->UnloadKinematics();
	99
543d5224	100	Info("Exec","Stop.");
	101	}//Exec()
	102	//__________________________________________________________________________________________________
ed3ceb24	103	void AliRICHClusterFinder::FindClusters(Int_t iChamber)
	104	{
	105	//finds neighbours and fill the tree with raw clusters
cbaf35fb	106	Int_t nDigits=Rich()->Digits(iChamber)->GetEntriesFast();
ed3ceb24	107	Info("FindClusters","Start for Chamber %i with %i digits.",iChamber,nDigits);
cbaf35fb	108	if(nDigits==0)return;
cbaf35fb	109
eaf390d9	110	fHitMap=new AliRICHMap(Rich()->Digits(iChamber));//create digit map for the given chamber
cbaf35fb	111
cbaf35fb	112	for(Int_t iDig=0;iDig<nDigits;iDig++){
e33758d8	113	AliRICHdigit dig=(AliRICHdigit)Rich()->Digits(iChamber)->At(iDig);
cbaf35fb	114	Int_t i=dig->X(); Int_t j=dig->Y();
	115	if(fHitMap->TestHit(i,j)==kUsed) continue;
	116
9d6f9427	117	FormRawCluster(i,j);
cbaf35fb	118
cbaf35fb	119	if(AliRICHParam::IsResolveClusters()) {
9d6f9427	120	ResolveCluster(); // ResolveCluster serialization will happen inside
cbaf35fb	121	} else {
9d6f9427	122	WriteRawCluster(); // simply output of the RawCluster found without deconvolution
ed3ceb24	123	}
9d6f9427	124	fCurrentCluster.Reset();
cbaf35fb	125	}//digits loop
	126
	127	delete fHitMap;
ed3ceb24	128	Info("FindClusters","Stop.");
cbaf35fb	129
ed3ceb24	130	}//FindClusters()
	131	//__________________________________________________________________________________________________
	132	void AliRICHClusterFinder::FindClusterContribs()
	133	{
	134	//finds CombiPid for a given cluster
	135	Info("FindClusterContribs","Start");
	136
	137	TObjArray *pDigits = fCurrentCluster.Digits();
	138	Int_t iNmips=0,iNckovs=0,iNfeeds=0;
	139	TArrayI contribs(3*fCurrentCluster.Size());
	140	Int_t pindex = new Int_t[3fCurrentCluster.Size()];
	141	for(Int_t iDigN=0;iDigN<fCurrentCluster.Size();iDigN++) {//loop on digits of a given cluster
	142	contribs[3iDigN] =((AliRICHdigit)pDigits->At(iDigN))->Tid(0);
	143	contribs[3iDigN+1]=((AliRICHdigit)pDigits->At(iDigN))->Tid(1);
	144	contribs[3iDigN+2]=((AliRICHdigit)pDigits->At(iDigN))->Tid(2);
	145	cout << "TID1 " << contribs[3iDigN] << " TID2 " << contribs[3iDigN+1] << " TID3 " << contribs[3*iDigN+2] << endl;
	146	}//loop on digits of a given cluster
	147	TMath::Sort(contribs.GetSize(),contribs.GetArray(),pindex);
	148	for(Int_t iDigN=0;iDigN<3*fCurrentCluster.Size()-1;iDigN++) {//loop on digits to sort Tid
	149	cout << " contrib " << contribs[pindex[iDigN]] << " digit " << iDigN <<
	150	" contrib " << contribs[pindex[iDigN+1]] << " digit " << iDigN+1 << endl;
	151	if(contribs[pindex[iDigN]]!=contribs[pindex[iDigN+1]]) {
	152	Int_t code = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPdgCode();
	153	Double_t charge = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPDG()->Charge();
	154
	155	if(code==50000050) iNckovs++;
	156	else if(code==50000051) iNfeeds++;
	157	else if(charge!=0) iNmips++;
	158	if (contribs[pindex[iDigN+1]]==kBad) break;
	159	}
	160	}//loop on digits to sort Tid
	161	fCurrentCluster.SetCombiPid(iNckovs,iNfeeds,iNmips);
	162	fCurrentCluster.Print();
	163	delete [] pindex;
	164	}// FindClusterContribs()
cbaf35fb	165	//__________________________________________________________________________________________________
9d6f9427	166	void AliRICHClusterFinder::FormRawCluster(Int_t i, Int_t j)
ed3ceb24	167	{
ed3ceb24	168	// Builder of the final Raw Cluster (before deconvolution)
cbaf35fb	169	Info("FormRawCluster","Start with digit(%i,%i)",i,j);
cbaf35fb	170
9d6f9427	171	fCurrentCluster.AddDigit((AliRICHdigit*) fHitMap->GetHit(i,j));
cbaf35fb	172	fHitMap->FlagHit(i,j);// Flag hit as taken
	173
	174	Int_t listX[4], listY[4]; // Now look recursively for all neighbours
	175	for (Int_t iNeighbour=0;iNeighbour<Rich()->Param()->PadNeighbours(i,j,listX,listY);iNeighbour++)
	176	if(fHitMap->TestHit(listX[iNeighbour],listY[iNeighbour])==kUnused)
9d6f9427	177	FormRawCluster(listX[iNeighbour],listY[iNeighbour]);
cbaf35fb	178	}//AddDigit2Cluster()
cbaf35fb	179	//__________________________________________________________________________________________________
9d6f9427	180	void AliRICHClusterFinder::ResolveCluster()
cbaf35fb	181	{// Decluster algorithm
cbaf35fb	182	Info("ResolveCluster","Start.");
9d6f9427	183
	184	fCurrentCluster.CoG(); // first initial approxmation of the CoG...to start minimization.
	185	fCurrentCluster.Print();
	186	switch (fCurrentCluster.Size()) {
cbaf35fb	187
9d6f9427	188	case 1:
	189	WriteRawCluster(); break;
	190	case 2:
	191	FitCoG();
	192	WriteRawCluster(); break;
	193
	194	default:
	195	WriteRawCluster(); break;
	196	}
cbaf35fb	197	}//ResolveCluster()
cbaf35fb	198	//__________________________________________________________________________________________________
9d6f9427	199	void AliRICHClusterFinder::WriteRawCluster()
cbaf35fb	200	{// out the current RawCluster
eaf390d9	201	Info("WriteRawCluster","Start.");
cbaf35fb	202
ed3ceb24	203	FindClusterContribs();
9d6f9427	204	Rich()->AddCluster(fCurrentCluster);
cbaf35fb	205
	206	}//WriteRawCluster()
	207	//__________________________________________________________________________________________________
9d6f9427	208	void AliRICHClusterFinder::FitCoG()
	209	{// Fit cluster size 2 by single Mathieson
	210	Info("FitCoG","Start.");
	211
	212	TMinuit *pMinuit = new TMinuit(2);
	213
	214	Double_t arglist;
	215	Int_t ierflag = 0;
	216
	217	static Double_t vstart[2];
	218	static Double_t lower[2], upper[2];
	219	static Double_t step[2]={0.001,0.001};
	220
	221	TString chname;
	222	Int_t ierflg;
	223
	224	pMinuit->SetObjectFit((TObject*)this);
	225	pMinuit->SetFCN(RICHMinMathieson);
	226	pMinuit->mninit(5,10,7);
	227
	228	vstart[0] = fCurrentCluster.X();
	229	vstart[1] = fCurrentCluster.Y();
	230
	231	lower[0] = vstart[0] - 2*AliRICHParam::PadSizeX();
	232	upper[0] = vstart[0] + 2*AliRICHParam::PadSizeX();
	233	lower[1] = vstart[1] - 2*AliRICHParam::PadSizeY();
	234	upper[1] = vstart[1] + 2*AliRICHParam::PadSizeY();
	235
	236
	237	pMinuit->mnparm(0," x position ",vstart[0],step[0],lower[0],upper[0],ierflag);
	238	pMinuit->mnparm(1," y position ",vstart[1],step[1],lower[1],upper[1],ierflag);
	239
	240	arglist = -1;
	241
	242	pMinuit->SetPrintLevel(-1);
	243	pMinuit->mnexcm("SET NOGR",&arglist, 1, ierflag);
	244	pMinuit->mnexcm("SET NOW",&arglist, 1, ierflag);
	245	arglist = 1;
	246	pMinuit->mnexcm("SET ERR", &arglist, 1,ierflg);
	247	arglist = -1;
	248	pMinuit->mnexcm("SIMPLEX",&arglist, 0, ierflag);
	249	pMinuit->mnexcm("MIGRAD",&arglist, 0, ierflag);
	250	pMinuit->mnexcm("EXIT" ,&arglist, 0, ierflag);
	251	Double_t xCoG,yCoG;
	252	Double_t eps, b1, b2;
	253	pMinuit->mnpout(0,chname, xCoG, eps , b1, b2, ierflg);
	254	pMinuit->mnpout(1,chname, yCoG, eps , b1, b2, ierflg);
	255	delete pMinuit;
	256	}
	257	//__________________________________________________________________________________________________
	258	void RICHMinMathieson(Int_t &, Double_t , Double_t &chi2, Double_t par, Int_t iflag)
	259	{// Minimization function of Mathieson
	260
	261	AliRICHcluster pRawCluster = ((AliRICHClusterFinder)gMinuit->GetObjectFit())->GetCurrentCluster();
	262
	263	TVector3 centroid(par[0],par[1],0);
	264
	265	chi2 = 0;
	266	Int_t qtot = pRawCluster->Q();
	267	for(Int_t i=0;i<pRawCluster->Size();i++) {
	268	Int_t padX = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->X();
	269	Int_t padY = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Y();
	270	Double_t padQ = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Q();
	271	chi2 += TMath::Power((qtot*AliRICHParam::Loc2PadFrac(centroid,padX,padY)-padQ),2)/padQ;
272	}
273	if(iflag == 3)
274	{
275	cout << " --- end convergence...summary --- " << endl;
276	cout << " x position " << par[0] << endl;
277	cout << " y position " << par[1] << endl;
278	cout << " chi2 " << chi2 << endl;
279	}
280	}//RICHMinMathieson()