/************************************************************************** * 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. * **************************************************************************/ /* $Id$ */ //_________________________________________________________________________ // Implementation version 1 of algorithm class to construct PHOS track segments // Associates EMC and PPSD clusters // Unfolds the EMC cluster // //*-- Author: Dmitri Peressounko (RRC Ki & SUBATECH) // // --- ROOT system --- #include "TObjArray.h" #include "TClonesArray.h" #include "TObjectTable.h" // --- Standard library --- #include // --- AliRoot header files --- #include "AliPHOSTrackSegmentMakerv1.h" #include "AliPHOSIndexToObject.h" #include "AliPHOSTrackSegment.h" #include "AliPHOSLink.h" #include "AliPHOSv0.h" #include "AliRun.h" extern void UnfoldingChiSquare(Int_t &nPar, Double_t *Grad, Double_t & fret, Double_t *x, Int_t iflag) ; ClassImp( AliPHOSTrackSegmentMakerv1) //____________________________________________________________________________ AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1() : AliPHOSTrackSegmentMaker() { // ctor fR0 = 10. ; //clusters are sorted in "rows" and "columns" of width geom->GetCrystalSize(0), fDelta = fR0 + fGeom->GetCrystalSize(0) ; if(!gMinuit) gMinuit = new TMinuit(100) ; fUnfoldFlag = kTRUE ; } //____________________________________________________________________________ AliPHOSTrackSegmentMakerv1::~AliPHOSTrackSegmentMakerv1() { // dtor delete gMinuit ; gMinuit = 0 ; } //____________________________________________________________________________ Bool_t AliPHOSTrackSegmentMakerv1::FindFit(AliPHOSEmcRecPoint * emcRP, int * maxAt, Float_t * maxAtEnergy, Int_t nPar, Float_t * fitparameters) { // Calls TMinuit to fit the energy distribution of a cluster with several maxima gMinuit->SetPrintLevel(-1) ; // No Printout gMinuit->SetFCN(UnfoldingChiSquare) ; // To set the address of the minimization function gMinuit->SetObjectFit(emcRP) ; // To tranfer pointer to UnfoldingChiSquare // filling initial values for fit parameters AliPHOSDigit * digit ; Int_t ierflg = 0; Int_t index = 0 ; Int_t nDigits = (Int_t) nPar / 3 ; Int_t iDigit ; for(iDigit = 0; iDigit < nDigits; iDigit++){ digit = (AliPHOSDigit *) maxAt[iDigit]; Int_t relid[4] ; Float_t x ; Float_t z ; fGeom->AbsToRelNumbering(digit->GetId(), relid) ; fGeom->RelPosInModule(relid, x, z) ; Float_t energy = maxAtEnergy[iDigit] ; gMinuit->mnparm(index, "x", x, 0.1, 0, 0, ierflg) ; index++ ; if(ierflg != 0){ cout << "PHOS Unfolding> Unable to set initial value for fit procedure : x = " << x << endl ; return kFALSE; } gMinuit->mnparm(index, "z", z, 0.1, 0, 0, ierflg) ; index++ ; if(ierflg != 0){ cout << "PHOS Unfolding> Unable to set initial value for fit procedure : z = " << z << endl ; return kFALSE; } gMinuit->mnparm(index, "Energy", energy , 0.05*energy, 0., 4.*energy, ierflg) ; index++ ; if(ierflg != 0){ cout << "PHOS Unfolding> Unable to set initial value for fit procedure : energy = " << energy << endl ; return kFALSE; } } Double_t p0 = 0.1 ; // "Tolerance" Evaluation stops when EDM = 0.0001*p0 ; The number of function call slightly // depends on it. Double_t p1 = 1.0 ; Double_t p2 = 0.0 ; gMinuit->mnexcm("SET STR", &p2, 0, ierflg) ; // force TMinuit to reduce function calls gMinuit->mnexcm("SET GRA", &p1, 1, ierflg) ; // force TMinuit to use my gradient gMinuit->SetMaxIterations(5); gMinuit->mnexcm("SET NOW", &p2 , 0, ierflg) ; // No Warnings gMinuit->mnexcm("MIGRAD", &p0, 0, ierflg) ; // minimize if(ierflg == 4){ // Minimum not found cout << "PHOS Unfolding> Fit not converged, cluster abandoned "<< endl ; return kFALSE ; } for(index = 0; index < nPar; index++){ Double_t err ; Double_t val ; gMinuit->GetParameter(index, val, err) ; // Returns value and error of parameter index fitparameters[index] = val ; } return kTRUE; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::FillOneModule(AliPHOSRecPoint::RecPointsList * emcIn, TArrayI * emcOut, AliPHOSRecPoint::RecPointsList * ppsdIn, TArrayI * ppsdOutUp, TArrayI * ppsdOutLow, Int_t & phosmod, Int_t & emcStopedAt, Int_t & ppsdStopedAt) { // Fill xxxOut arrays with clusters from one PHOS module AliPHOSEmcRecPoint * emcRecPoint ; AliPHOSPpsdRecPoint * ppsdRecPoint ; Int_t index ; Int_t nEmcUnfolded = emcIn->GetEntries() ; emcOut->Set(nEmcUnfolded); Int_t inEmcOut = 0 ; for(index = emcStopedAt; index < nEmcUnfolded; index++){ emcRecPoint = (AliPHOSEmcRecPoint *) emcIn->At(index) ; if(emcRecPoint->GetPHOSMod() != phosmod ) break ; emcOut->AddAt(emcRecPoint->GetIndexInList(),inEmcOut) ; inEmcOut++ ; } emcOut->Set(inEmcOut) ; emcStopedAt = index ; ppsdOutLow->Set(ppsdIn->GetEntries()) ; ppsdOutUp->Set(ppsdIn->GetEntries()) ; Int_t inPpsdLow = 0; Int_t inPpsdUp = 0; for(index = ppsdStopedAt; index < ppsdIn->GetEntries(); index++){ ppsdRecPoint = (AliPHOSPpsdRecPoint *) ppsdIn->At(index) ; if(ppsdRecPoint->GetPHOSMod() != phosmod ) break ; if(ppsdRecPoint->GetUp() ) ppsdOutUp->AddAt(index,inPpsdUp++) ; else ppsdOutLow->AddAt(index,inPpsdLow++) ; } ppsdOutLow->Set(inPpsdLow); ppsdOutUp->Set(inPpsdUp); ppsdStopedAt = index ; } //____________________________________________________________________________ Float_t AliPHOSTrackSegmentMakerv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcclu,AliPHOSPpsdRecPoint * PpsdClu, Bool_t &toofar) { // Calculates the distance between the EMC RecPoint and the PPSD RecPoint Float_t r = fR0 ; TVector3 vecEmc ; TVector3 vecPpsd ; emcclu->GetLocalPosition(vecEmc) ; PpsdClu->GetLocalPosition(vecPpsd) ; if(emcclu->GetPHOSMod() == PpsdClu->GetPHOSMod()){ // if(vecPpsd.X() >= vecEmc.X() - fDelta ){ // if(vecPpsd.Z() >= vecEmc.Z() - fDelta ){ // Correct to difference in CPV and EMC position due to different distance to center. // we assume, that particle moves from center Float_t dCPV = fGeom->GetIPtoOuterCoverDistance(); Float_t dEMC = fGeom->GetIPtoCrystalSurface() ; dEMC = dEMC / dCPV ; vecPpsd = dEMC * vecPpsd - vecEmc ; r = vecPpsd.Mag() ; // } // if zPpsd >= zEmc - fDelta toofar = kFALSE ; //} // if xPpsd >= xEmc - fDelta // else //toofar = kTRUE ; } else toofar = kTRUE ; //toofar = kFALSE ; return r ; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::MakeLinks(TArrayI * emcRecPoints, TArrayI * ppsdRecPointsUp, TArrayI * ppsdRecPointsLow, TClonesArray * linklowArray, TClonesArray *linkupArray) { // Finds distances (links) between all EMC and PPSD clusters, which are not further apart from each other than fR0 AliPHOSPpsdRecPoint * ppsdlow ; AliPHOSPpsdRecPoint * ppsdup ; AliPHOSEmcRecPoint * emcclu ; Int_t iLinkLow = 0 ; Int_t iLinkUp = 0 ; Int_t iEmcRP; for(iEmcRP = 0; iEmcRP < emcRecPoints->GetSize(); iEmcRP++ ) { emcclu = (AliPHOSEmcRecPoint *) fPlease->GimeRecPoint(emcRecPoints->At(iEmcRP),"emc") ; Bool_t toofar ; Int_t iPpsdLow ; for(iPpsdLow = 0; iPpsdLow < ppsdRecPointsLow->GetSize();iPpsdLow++ ) { ppsdlow = (AliPHOSPpsdRecPoint *) fPlease->GimeRecPoint(ppsdRecPointsLow->At(iPpsdLow),"ppsd") ; Float_t r = GetDistanceInPHOSPlane(emcclu, ppsdlow, toofar) ; if(toofar) break ; if(r < fR0){ new( (*linklowArray)[iLinkLow++]) AliPHOSLink(r, iEmcRP, iPpsdLow) ; } } Int_t iPpsdUp = 0 ; for(iPpsdUp = 0; iPpsdUp < ppsdRecPointsUp->GetSize();iPpsdUp++ ) { ppsdup = (AliPHOSPpsdRecPoint *)fPlease->GimeRecPoint(ppsdRecPointsUp->At(iPpsdUp),"ppsd") ; Float_t r = GetDistanceInPHOSPlane(emcclu, ppsdup, toofar) ; if(toofar) break ; if(r < fR0) { new( (*linkupArray)[iLinkUp++]) AliPHOSLink(r, iEmcRP, iPpsdUp) ; } } } linklowArray->Sort() ; //first links with smallest distances linkupArray->Sort() ; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::MakePairs(TArrayI * emcRecPoints, TArrayI * ppsdRecPointsUp, TArrayI * ppsdRecPointsLow, TClonesArray * linklowArray, TClonesArray * linkupArray, AliPHOSTrackSegment::TrackSegmentsList * trsl) { // Finds the smallest links and makes pairs of PPSD and EMC clusters with smallest distance TIter nextLow(linklowArray) ; TIter nextUp(linkupArray) ; AliPHOSLink * linkLow ; AliPHOSLink * linkUp ; Int_t emc ; Int_t ppsdLow ; Int_t ppsdUp ; AliPHOSPpsdRecPoint * nullpointer = 0 ; ppsdUp = 0 ; while ( (linkLow = (AliPHOSLink *)nextLow() ) ){ emc = emcRecPoints->At(linkLow->GetEmc()) ; ppsdLow = ppsdRecPointsLow->At(linkLow->GetPpsd()) ; if( (emc >= 0) && (ppsdLow >= 0) ){ // RecPoints not removed yet new( (*trsl)[fNTrackSegments] ) AliPHOSTrackSegment((AliPHOSEmcRecPoint *)fPlease->GimeRecPoint(emc,"emc"), nullpointer, (AliPHOSPpsdRecPoint *)fPlease->GimeRecPoint(ppsdLow,"ppsd") ) ; ((AliPHOSTrackSegment* )trsl->At(fNTrackSegments))->SetIndexInList(fNTrackSegments); //replace index of emc to negative and shifted index of TS emcRecPoints->AddAt(-2 - fNTrackSegments,linkLow->GetEmc()) ; //replace index of PPSD Low to negative and shifted index of TS ppsdRecPointsLow->AddAt(-2 - fNTrackSegments,linkLow->GetPpsd()) ; fNTrackSegments++ ; } } while ( (linkUp = (AliPHOSLink *)nextUp() ) ){ emc = emcRecPoints->At(linkUp->GetEmc()) ; if(emc != -1){ //without ppsd Up yet ppsdUp = ppsdRecPointsUp->At(linkUp->GetPpsd()) ; if(ppsdUp >= 0){ //ppsdUp still exist if(emc >= 0){ //without ppsd Low => create new TS fNTrackSegments = trsl->GetEntries() ; new( (*trsl)[fNTrackSegments] ) AliPHOSTrackSegment((AliPHOSEmcRecPoint *) fPlease->GimeRecPoint(emc,"emc"), (AliPHOSPpsdRecPoint *)fPlease->GimeRecPoint(ppsdUp,"ppsd"), nullpointer) ; ((AliPHOSTrackSegment *) trsl->At(fNTrackSegments))->SetIndexInList(fNTrackSegments); fNTrackSegments++ ; } else{ // append ppsd Up to existing TS ((AliPHOSTrackSegment *)trsl->At(-2-emc))->SetPpsdUpRecPoint((AliPHOSPpsdRecPoint *)fPlease->GimeRecPoint(ppsdUp,"ppsd")); } emcRecPoints->AddAt(-1,linkUp->GetEmc()) ; //Mark that PPSD Up found //replace index of PPSD Up to negative and shifted index of TS ppsdRecPointsUp->AddAt(-2 - fNTrackSegments,linkUp->GetPpsd()) ; } //if ppsdUp still exist } } Int_t iEmcRP ; for(iEmcRP = 0; iEmcRP GetSize() ; iEmcRP++ ){ emc = emcRecPoints->At(iEmcRP) ; if(emc >=0 ){ ppsdUp = 0; ppsdLow = 0; new( (*trsl)[fNTrackSegments] ) AliPHOSTrackSegment((AliPHOSEmcRecPoint *) fPlease->GimeRecPoint(emc,"emc"), nullpointer, nullpointer ) ; ((AliPHOSTrackSegment *) trsl->At(fNTrackSegments))->SetIndexInList(fNTrackSegments); fNTrackSegments++; } } } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::MakeTrackSegments(DigitsList * dl, AliPHOSRecPoint::RecPointsList * emcl, AliPHOSRecPoint::RecPointsList * ppsdl, AliPHOSRecPoint::RecPointsList * cpvl, AliPHOSTrackSegment::TrackSegmentsList * trsl) { // Makes the track segments out of the list of EMC and PPSD Recpoints and stores them in a list Int_t emcStopedAt = 0 ; Int_t ppsdStopedAt = 0 ; fNTrackSegments = 0 ; TArrayI * emcRecPoints = new TArrayI(1000) ; // these arrays keep indexes TArrayI * ppsdRecPointsUp = new TArrayI(1000) ; // of RecPoints, which are TArrayI * ppsdRecPointsLow = new TArrayI(1000) ; // kept in TClonesArray's emcl, ppsdl, cpv TClonesArray * linklowArray = new TClonesArray("AliPHOSLink", 1000); TClonesArray * linkupArray = new TClonesArray("AliPHOSLink", 1000); if(fUnfoldFlag){ UnfoldAll(dl, emcl) ; // Unfolds all EMC clusters UnfoldAll(dl, cpvl) ; // Unfolds all CPV clusters } Int_t phosmod = fGeom->GetNCPVModules() + 1 ; while(phosmod <= fGeom->GetNModules() ){ FillOneModule(emcl, emcRecPoints, ppsdl, ppsdRecPointsUp, ppsdRecPointsLow, phosmod, emcStopedAt, ppsdStopedAt) ; MakeLinks(emcRecPoints, ppsdRecPointsUp, ppsdRecPointsLow, linklowArray, linkupArray) ; MakePairs(emcRecPoints, ppsdRecPointsUp, ppsdRecPointsLow, linklowArray, linkupArray, trsl) ; emcRecPoints->Reset() ; ppsdRecPointsUp->Reset() ; ppsdRecPointsLow->Reset() ; linkupArray->Clear() ; linklowArray->Clear() ; phosmod++ ; } delete emcRecPoints ; emcRecPoints = 0 ; delete ppsdRecPointsUp ; ppsdRecPointsUp = 0 ; delete ppsdRecPointsLow ; ppsdRecPointsLow = 0 ; delete linkupArray ; linkupArray = 0 ; delete linklowArray ; linklowArray = 0 ; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::MakeTrackSegmentsCPV(DigitsList * dl, AliPHOSRecPoint::RecPointsList * emcl, AliPHOSRecPoint::RecPointsList * cpvl) { // Unfold clusters in EMC and CPV and refill reconstructed point lists emcl and ppsdl // Yuri Kharlov. 19 October 2000 fNTrackSegments = 0 ; TArrayI * emcRecPoints = new TArrayI(1000) ; // these arrays keep indexes TArrayI * cpvRecPoints = new TArrayI(1000) ; // of RecPoints, which are kept in emcl and ppsdl if(fUnfoldFlag){ UnfoldAll(dl, emcl) ; // Unfolds all EMC clusters UnfoldAll(dl, cpvl) ; // Unfolds all CPV clusters } // Int_t phosmod = 1 ; // Int_t emcStopedAt = 0 ; // Int_t cpvStopedAt = 0 ; // while(phosmod <= fGeom->GetNModules() ){ // FillOneModule(emcl, emcRecPoints, ppsdl, cpvRecPoints, phosmod, emcStopedAt, cpvStopedAt) ; // emcRecPoints->Reset() ; // cpvRecPoints->Reset() ; // phosmod++ ; // } delete emcRecPoints ; emcRecPoints = 0 ; delete cpvRecPoints ; cpvRecPoints = 0 ; } //____________________________________________________________________________ Double_t AliPHOSTrackSegmentMakerv1::ShowerShape(Double_t r) { // Shape of the shower (see PHOS TDR) // If you change this function, change also the gradien evaluation in ChiSquare() Double_t r4 = r*r*r*r ; Double_t r295 = TMath::Power(r, 2.95) ; Double_t shape = TMath::Exp( -r4 * (1. / (2.32 + 0.26 * r4) + 0.0316 / (1 + 0.0652 * r295) ) ) ; return shape ; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::UnfoldAll(DigitsList * dl, AliPHOSRecPoint::RecPointsList * emcIn) { // Performs unfolding of all EMC clusters, sorts them and resets indexes in RecPoints AliPHOSEmcRecPoint * emcRecPoint ; Int_t index ; Int_t nEmcUnfolded = emcIn->GetEntries() ; for(index = 0 ; index < nEmcUnfolded; index++){ emcRecPoint = (AliPHOSEmcRecPoint *) emcIn->At(index) ; Int_t nMultipl = emcRecPoint->GetMultiplicity() ; Int_t * maxAt = new Int_t[nMultipl] ; Float_t * maxAtEnergy = new Float_t[nMultipl] ; Int_t nMax = emcRecPoint->GetNumberOfLocalMax(maxAt, maxAtEnergy) ; if( nMax > 1 ) { // if cluster is very flat (no pronounced maximum) then nMax = 0 UnfoldClusters(dl, emcIn, emcRecPoint, nMax, maxAt, maxAtEnergy) ; emcIn->Remove(emcRecPoint); emcIn->Compress() ; index-- ; nEmcUnfolded-- ; } delete[] maxAt ; delete[] maxAtEnergy ; } //Unfolding finished emcIn->Sort() ; // to set index to new and correct index of old RecPoints for( index = 0 ; index < emcIn->GetEntries() ; index++){ ((AliPHOSEmcRecPoint *) emcIn->At(index))->SetIndexInList(index) ; } emcIn->Sort() ; } //____________________________________________________________________________ void AliPHOSTrackSegmentMakerv1::UnfoldClusters(DigitsList * dl, AliPHOSRecPoint::RecPointsList * emcIn, AliPHOSEmcRecPoint * iniEmc, Int_t nMax, int * maxAt, Float_t * maxAtEnergy) { // Performs the unfolding of a cluster with nMax overlapping showers // This is time consuming (use the (Un)SetUnfolFlag() ) Int_t nPar = 3 * nMax ; Float_t * fitparameters = new Float_t[nPar] ; Bool_t rv = FindFit(iniEmc, maxAt, maxAtEnergy, nPar, fitparameters) ; if( !rv ) { // Fit failed, return and remove cluster delete[] fitparameters ; return ; } Float_t xDigit ; Float_t zDigit ; Int_t relid[4] ; Int_t nDigits = iniEmc->GetMultiplicity() ; Float_t xpar ; Float_t zpar ; Float_t epar ; Float_t distance ; Float_t ratio ; Float_t * efit = new Float_t[nDigits] ; Int_t iparam ; Int_t iDigit ; AliPHOSDigit * digit ; AliPHOSEmcRecPoint * emcRP ; Int_t * emcDigits = iniEmc->GetDigitsList() ; Float_t * emcEnergies = iniEmc->GetEnergiesList() ; Int_t iRecPoint = emcIn->GetEntries() ; for(iDigit = 0 ; iDigit < nDigits ; iDigit ++){ digit = fPlease->GimeDigit( emcDigits[iDigit] ) ; fGeom->AbsToRelNumbering(digit->GetId(), relid) ; fGeom->RelPosInModule(relid, xDigit, zDigit) ; efit[iDigit] = 0; iparam = 0 ; while(iparam < nPar ){ xpar = fitparameters[iparam] ; zpar = fitparameters[iparam+1] ; epar = fitparameters[iparam+2] ; iparam += 3 ; distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ; distance = TMath::Sqrt(distance) ; efit[iDigit] += epar * AliPHOSTrackSegmentMakerv1::ShowerShape(distance) ; } } iparam = 0 ; Float_t eDigit ; while(iparam < nPar ){ xpar = fitparameters[iparam] ; zpar = fitparameters[iparam+1] ; epar = fitparameters[iparam+2] ; iparam += 3 ; if(iRecPoint >= emcIn->GetSize()) emcIn->Expand(2*iRecPoint) ; (*emcIn)[iRecPoint] = new AliPHOSEmcRecPoint( iniEmc->GetLogWeightCut(), iniEmc->GetLocMaxCut() ) ; emcRP = (AliPHOSEmcRecPoint *) emcIn->At(iRecPoint); iRecPoint++ ; for(iDigit = 0 ; iDigit < nDigits ; iDigit ++){ digit = fPlease->GimeDigit( emcDigits[iDigit] ) ; fGeom->AbsToRelNumbering(digit->GetId(), relid) ; fGeom->RelPosInModule(relid, xDigit, zDigit) ; distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ; distance = TMath::Sqrt(distance) ; ratio = epar * AliPHOSTrackSegmentMakerv1::ShowerShape(distance) / efit[iDigit] ; eDigit = emcEnergies[iDigit] * ratio ; emcRP->AddDigit( *digit, eDigit ) ; } } delete[] fitparameters ; delete[] efit ; } //______________________________________________________________________________ void UnfoldingChiSquare(Int_t & nPar, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag) { // Calculates th Chi square for the cluster unfolding minimization // Number of parameters, Gradient, Chi squared, parameters, what to do AliPHOSEmcRecPoint * emcRP = (AliPHOSEmcRecPoint *) gMinuit->GetObjectFit() ; // EmcRecPoint to fit Int_t * emcDigits = emcRP->GetDigitsList() ; Int_t nOfDigits = emcRP->GetDigitsMultiplicity() ; Float_t * emcEnergies = emcRP->GetEnergiesList() ; AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ; AliPHOSIndexToObject * please = AliPHOSIndexToObject::GetInstance() ; fret = 0. ; Int_t iparam ; if(iflag == 2) for(iparam = 0 ; iparam < nPar ; iparam++) Grad[iparam] = 0 ; // Will evaluate gradient Double_t efit ; AliPHOSDigit * digit ; Int_t iDigit ; for( iDigit = 0 ; iDigit < nOfDigits ; iDigit++) { digit = please->GimeDigit( emcDigits[iDigit] ) ; Int_t relid[4] ; Float_t xDigit ; Float_t zDigit ; geom->AbsToRelNumbering(digit->GetId(), relid) ; geom->RelPosInModule(relid, xDigit, zDigit) ; if(iflag == 2){ // calculate gradient Int_t iParam = 0 ; efit = 0 ; while(iParam < nPar ){ Double_t distance = (xDigit - x[iParam]) * (xDigit - x[iParam]) ; iParam++ ; distance += (zDigit - x[iParam]) * (zDigit - x[iParam]) ; distance = TMath::Sqrt( distance ) ; iParam++ ; efit += x[iParam] * AliPHOSTrackSegmentMakerv1::ShowerShape(distance) ; iParam++ ; } Double_t sum = 2. * (efit - emcEnergies[iDigit]) / emcEnergies[iDigit] ; // Here we assume, that sigma = sqrt(E) iParam = 0 ; while(iParam < nPar ){ Double_t xpar = x[iParam] ; Double_t zpar = x[iParam+1] ; Double_t epar = x[iParam+2] ; Double_t dr = TMath::Sqrt( (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ); Double_t shape = sum * AliPHOSTrackSegmentMakerv1::ShowerShape(dr) ; Double_t r4 = dr*dr*dr*dr ; Double_t r295 = TMath::Power(dr,2.95) ; Double_t deriv =-4. * dr*dr * ( 2.32 / ( (2.32 + 0.26 * r4) * (2.32 + 0.26 * r4) ) + 0.0316 * (1. + 0.0171 * r295) / ( ( 1. + 0.0652 * r295) * (1. + 0.0652 * r295) ) ) ; Grad[iParam] += epar * shape * deriv * (xpar - xDigit) ; // Derivative over x iParam++ ; Grad[iParam] += epar * shape * deriv * (zpar - zDigit) ; // Derivative over z iParam++ ; Grad[iParam] += shape ; // Derivative over energy iParam++ ; } } efit = 0; iparam = 0 ; while(iparam < nPar ){ Double_t xpar = x[iparam] ; Double_t zpar = x[iparam+1] ; Double_t epar = x[iparam+2] ; iparam += 3 ; Double_t distance = (xDigit - xpar) * (xDigit - xpar) + (zDigit - zpar) * (zDigit - zpar) ; distance = TMath::Sqrt(distance) ; efit += epar * AliPHOSTrackSegmentMakerv1::ShowerShape(distance) ; } fret += (efit-emcEnergies[iDigit])*(efit-emcEnergies[iDigit])/emcEnergies[iDigit] ; // Here we assume, that sigma = sqrt(E) } }