[u/mrichter/AliRoot.git] / ITS / AliITSclusterSSD.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.                  *
 **************************************************************************/

/* $Id$ */
////////////////////////////////////////////////////////////////////////////
//Piotr Krzysztof Skowronski                                              //
//Warsaw University of Technology                                         // 
//skowron@if.pw.edu.pl                                                    //
//                                                                        // 
// Describes set of neighbouring digits on one side of detector,          //
// that are supposed to be generated by one particle.                     //
// includes information about clusters on other side that it crosses with //
////////////////////////////////////////////////////////////////////////////

#include "TArrayI.h"
#include "TClonesArray.h"
#include "AliITSdigitSSD.h"
#include "AliITSclusterSSD.h"

ClassImp(AliITSclusterSSD)

//______________________________________________________________________
AliITSclusterSSD::AliITSclusterSSD():
fSide(kTRUE),
fDigits(0),
fNDigits(0),
fDigitsIndex(0),
fNCrosses(0),
fCrossedClusterIndexes(0),
fLeftNeighbour(kFALSE),
fRightNeighbour(kFALSE),
fConsumed(kFALSE),
fTotalSignal(-1),
fNTracks(-1){
    // default constructor
}
//______________________________________________________________________
AliITSclusterSSD::AliITSclusterSSD(Int_t ndigits, Int_t *DigitIndexes, 
				   TObjArray *Digits, Bool_t side):
fSide(side),
fDigits(Digits),
fNDigits(ndigits),
fDigitsIndex(0),
fNCrosses(0),
fCrossedClusterIndexes(0),
fLeftNeighbour(kFALSE),
fRightNeighbour(kFALSE),
fConsumed(kFALSE),
fTotalSignal(-1),
fNTracks(-1){
    // non-default constructor

    fDigitsIndex = new TArrayI(fNDigits,DigitIndexes );	
    fCrossedClusterIndexes = new TArrayI(300);
}
//______________________________________________________________________
AliITSclusterSSD::~AliITSclusterSSD(){
    // destructor

    delete fDigitsIndex;
    delete fCrossedClusterIndexes;
}
//______________________________________________________________________
AliITSclusterSSD::AliITSclusterSSD(const AliITSclusterSSD &OneSCluster) : 
TObject(OneSCluster),
fSide(OneSCluster.fSide),
fDigits(OneSCluster.fDigits),
fNDigits(OneSCluster.fNDigits),
fDigitsIndex(0),
fNCrosses(OneSCluster.fNCrosses),
fCrossedClusterIndexes(0),
fLeftNeighbour(OneSCluster.fLeftNeighbour),
fRightNeighbour(OneSCluster.fRightNeighbour),
fConsumed(OneSCluster.fConsumed),
fTotalSignal(-1),
fNTracks(-1){
    // copy constructor

    fDigitsIndex = new TArrayI(fNDigits);
    fTotalSignal =-1;
    fNTracks     = -1;
    Int_t i;
    for (i = 0; i< fNCrosses ; i++){
	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
    }
    for (i = 0; i< fNDigits ; i++){
	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
    }
    return;
}
//______________________________________________________________________
AliITSclusterSSD& AliITSclusterSSD::operator=(const AliITSclusterSSD 
					      &OneSCluster){
    // assignment operator

    if (this == &OneSCluster) return *this;
    fNDigits = OneSCluster.fNDigits;
    fSide=OneSCluster.fSide;
    fDigits=OneSCluster.fDigits;
    fDigitsIndex = new TArrayI(fNDigits);
    fLeftNeighbour  = OneSCluster.fLeftNeighbour;
    fRightNeighbour = OneSCluster.fRightNeighbour;
    fTotalSignal =-1;
    fNTracks     = -1;
    fNCrosses = OneSCluster.fNCrosses;
    fConsumed = OneSCluster.fConsumed;
    Int_t i;
    for (i = 0; i< fNCrosses ; i++){
	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
    }
    for (i = 0; i< fNDigits ; i++){
	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
    }
    return *this;
}
//______________________________________________________________________
Int_t AliITSclusterSSD::SplitCluster(Int_t where, Int_t *outdigits){
    //This methods generate data necessery to make new object of this class
    //I choosen this way, because methods TClonesArray::Add* dont work
    //so I have to use constraction: new (a[i]) Creator(params...);
    //where 'a' is a TClonesArray 
    //This method generate params - see AliITSmoduleSSD::SplitCluster;
    Int_t tmp = fNDigits;
    Int_t ind = 0;

    outdigits[ind++]=(*fDigitsIndex)[where];
    //coping border strip (it is shared by this two clusters)
    for (Int_t i = (where+1); i < tmp; i++) {
	outdigits[ind++]=(*fDigitsIndex)[i];  
	//"moving" strips from this to the new one 
	(*fDigitsIndex)[i]=-1;   
	fNDigits--;   //deleting strips from this cluster
    } 
    return ind;		
}
//______________________________________________________________________
Int_t AliITSclusterSSD::GetDigitStripNo(Int_t digit){
    // return strip no of a digit
    if (digit<0) return -1;
    return (digit>(fNDigits-1)) ? -1 :
	((AliITSdigitSSD*)(fDigits->At((*fDigitsIndex)[digit])))->GetStripNumber();
}
//______________________________________________________________________
Int_t AliITSclusterSSD::GetDigitSignal(Int_t digit){
    // returns digit signal
    Int_t index,signal;
    if (digit<0||digit>=fNDigits) return -1;
    index  = (*fDigitsIndex)[digit];
    signal = ((AliITSdigitSSD*)(fDigits->At(index)))->GetSignal();
    /*
      if(signal>1.e5) printf("GetDigitSignal: digit %d index %d signal %d\n",
      digit,index, signal);
    */
    return  signal;
}
//______________________________________________________________________
void  AliITSclusterSSD::AddCross(Int_t clIndex){
    // add cluster cross to list of cluster crosses
  
    (*fCrossedClusterIndexes)[fNCrosses++] = clIndex;
}
//______________________________________________________________________
Int_t AliITSclusterSSD::GetCross(Int_t crIndex) const {
    // return crossing cluster

    return ((crIndex>-1)&&(crIndex<fNCrosses))?(*fCrossedClusterIndexes)[crIndex]:-1;
}
//______________________________________________________________________
Double_t AliITSclusterSSD::CentrOfGravity(){
    // return center of gravity of the cluster
    Float_t ret=0;
  
    if (fLeftNeighbour) ret+=(GetDigitStripNo(0)*0.5*GetDigitSignal(0));
    else ret+=(GetDigitStripNo(0)*GetDigitSignal(0));
    if (fRightNeighbour) ret+=(GetDigitStripNo(fNDigits -1)*0.5*GetDigitSignal(fNDigits -1));
    else ret+=(GetDigitStripNo(fNDigits -1)*GetDigitSignal(fNDigits-1));
    for (Int_t i=1;i<fNDigits-1;i++){
	ret +=GetDigitStripNo(i)*GetDigitSignal(i);
    }// end for i
  
    if (fTotalSignal<0) GetTotalSignal();
	
    return (ret/fTotalSignal);
}
//______________________________________________________________________
Float_t AliITSclusterSSD::GetTotalSignal(){
    // return total signal
  
    if(fTotalSignal <0){
	fTotalSignal=0;
	if (fNDigits ==1)  {
	    fTotalSignal = (Float_t)GetDigitSignal(0);
	    //printf("1 digit: signal %d \n",GetDigitSignal(0)); 
	    return fTotalSignal;
	}
	if (fLeftNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(0));
	else fTotalSignal += (Float_t) GetDigitSignal(0);
	//printf("GetTotalSignal :i DigitSignal %d %d \n",0,GetDigitSignal(0));
	if (fRightNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(
                                                                 fNDigits -1));
      else fTotalSignal += (Float_t)GetDigitSignal(fNDigits-1);
	//printf("GetTotalSignal :i  DigitSignal %d %d \n",fNDigits -1,GetDigitSignal(fNDigits -1));
	for (Int_t i = 1;i<fNDigits -1;i++){
	    fTotalSignal += (Float_t)GetDigitSignal(i);
	    //printf("GetTotalSignal :i  DigitSignal %d %d \n",i,GetDigitSignal(i)); 
      	}
	//printf("GetTotalSignal: fNDigits %d fTotalSignal %.0f \n",fNDigits,fTotalSignal); 
    }
    return fTotalSignal;
}
//______________________________________________________________________
Float_t  AliITSclusterSSD::GetTotalSignalError(){
    // return the error on the signal
    Float_t err =0;
    for (Int_t i =1; i<fNDigits -1; i++){
	err+=0.1*GetDigitSignal(i);   
    } 
    if (GetLeftNeighbour()){
	err+=GetDigitSignal(0);
    }else{
	err+=0.1*GetDigitSignal(0);
    } 
    if (GetRightNeighbour()){
	err+=GetDigitSignal(fNDigits -1);
    }else{
	err+=0.1*GetDigitSignal(fNDigits -1);
    }
    return err;
}
//______________________________________________________________________
void AliITSclusterSSD::DelCross(Int_t index){
    // remove cross clusters from the list of cross clusters
    Int_t i,j; //iterators

    for (i =0;i<fNCrosses;i++){
	if ((*fCrossedClusterIndexes)[i] == index){
	    for (j=i;j<fNCrosses-1;j++){
		(*fCrossedClusterIndexes)[j]=(*fCrossedClusterIndexes)[j+1];
	    }
	    fNCrosses--;
	    return; 
	}
    }
}
//______________________________________________________________________
Int_t  *AliITSclusterSSD::GetTracks(Int_t &nt){
    // return the track number of the cluster
    Int_t ntrk = GetDigit(0)->GetNTracks();
    Int_t ndig = GetNumOfDigits();
    Int_t *idig = new Int_t[ndig];
    Int_t *sdig = new Int_t[ndig];
    Int_t *itrk = new Int_t[ndig*ntrk];
    Int_t i,j,k,l,trk;
    Bool_t b;

    for(i=0;i<ndig;i++){idig[i] = i;sdig[i] = GetDigit(i)->GetSignal();}
    TMath::Sort(ndig,sdig,idig,kTRUE);
    for(i=0;i<ndig*ntrk;i++) itrk[i] = -3;
    j = k = l = 0;
    for(i=0;i<ndig;i++){ // fill itrk with track numbers in order of digit size
	j = idig[i];
	for(k=0;k<ntrk;k++) if((trk = GetDigit(j)->GetTrack(k))>=0) {
	    itrk[l] = trk;
	    l++;
	} // end for k/if
    } // end for i
    for(i=0;i<10;i++) fTrack[i] = -3;
    fTrack[0] = itrk[0]; // first element
    k = 1;
    b = kTRUE;
    for(i=1;i<l;i++){
	for(j=0;j<k;j++) if(fTrack[j]==itrk[i]) b = kFALSE;
	if(b){fTrack[k] = itrk[i]; k++;}
	if(k>9) break;
    } // end for i
    nt = k;

    delete[] idig;
    delete[] sdig;
    delete[] itrk;

    return fTrack;
/*
    Int_t *tidx=0;
    Int_t i, j,n;
    Int_t bit =0;
    Int_t ntracks=0;
    nt=0;

    for (i=0;i<10;i++) fTrack[i] = -3;
   
    //cout<<"GetTrack start -------: fNDigits ="<<fNDigits<<endl;

    for (i = 0; i<fNDigits; i++) {
	tidx = GetDigit(i)->GetTracks();
	n    = GetDigit(i)->GetNTracks();
	for (j = 0; j<n && j<10;j++) {
	    if (tidx[j] >= 0) {
		if(ntracks == 0){
		    fTrack[ntracks] = tidx[j];
		    ntracks++; 
		}else if(tidx[j] != fTrack[ntracks-1]){
		    ntracks++; 
		    if(ntracks > 9) {
			bit = 1;
			break;
		    } // end if ntracks > 9
		    fTrack[ntracks-1] = tidx[j];
		} // end if ntracke == 0
	    } // end if tidx[j] >=0
	} // 3-tracks loop for the digit 
	if(bit == 1) break;
    } // digit loop

    SetNTracks(ntracks); 
    nt = ntracks;
    return &(fTrack[0]);
*/
}
//______________________________________________________________________
Double_t AliITSclusterSSD::GetPosition(){
    // return position of the cluster
    Float_t ret;

    switch(fNDigits){
    case  1:
	ret = GetDigitStripNo(0);
	break;
    case  2:
	ret = EtaAlgorithm();
	break;       
    default:
	ret = CentrOfGravity();   
    }
    return ret;
}
//______________________________________________________________________
Double_t AliITSclusterSSD::EtaAlgorithm(){
    // algorithm for determing cluster position
    if (fNDigits != 2) return -1;

    Int_t strip1  = GetDigit(0)->GetStripNumber(); 
    Int_t strip2  = GetDigit(1)->GetStripNumber();
    Int_t signal1 = GetDigit(0)->GetSignal();
    Int_t signal2 = GetDigit(1)->GetSignal();

    Double_t eta;
  
 
    if (strip1<strip2){
	eta = ((Double_t)signal2)/((Double_t)(signal1+signal2));
	if (eta<0.04) return strip1;
	if (eta>0.96) return strip2;
	return (strip1 + 0.43478261*eta + 0.2826087);   
    } else{
	eta = ((Double_t)signal1)/((Double_t)(signal1+signal2));
	if (eta<0.04) return strip2;
	if (eta>0.96) return strip1;
	return (strip2 + 0.43478261*eta + 0.2826087);   
    }
}
//______________________________________________________________________
Double_t  AliITSclusterSSD::GetPositionError() const {
    // return the position error
    return (GetNumOfDigits()+1)/2;
}
//______________________________________________________________________
Bool_t AliITSclusterSSD::IsCrossingWith(Int_t idx) const{
    // return the cluster to which he crosses

    for (Int_t i =0; i< fNCrosses;i++){
	if (GetCross(i) == idx) return kTRUE;
    }
    return kFALSE;
}
Commit	Line	Data
ee86d557	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
88cb7938	16	/* $Id$ */
7d62fb64	17	////////////////////////////////////////////////////////////////////////////
	18	//Piotr Krzysztof Skowronski //
	19	//Warsaw University of Technology //
	20	//skowron@if.pw.edu.pl //
	21	// //
	22	// Describes set of neighbouring digits on one side of detector, //
	23	// that are supposed to be generated by one particle. //
	24	// includes information about clusters on other side that it crosses with //
	25	////////////////////////////////////////////////////////////////////////////
ee86d557	26
ee86d557	27	#include "TArrayI.h"
ee86d557	28	#include "TClonesArray.h"
e869281d	29	#include "AliITSdigitSSD.h"
b0f5e3fc	30	#include "AliITSclusterSSD.h"
	31
	32	ClassImp(AliITSclusterSSD)
	33
ee86d557	34	//______________________________________________________________________
e56160b8	35	AliITSclusterSSD::AliITSclusterSSD():
	36	fSide(kTRUE),
	37	fDigits(0),
	38	fNDigits(0),
	39	fDigitsIndex(0),
	40	fNCrosses(0),
	41	fCrossedClusterIndexes(0),
	42	fLeftNeighbour(kFALSE),
	43	fRightNeighbour(kFALSE),
	44	fConsumed(kFALSE),
	45	fTotalSignal(-1),
	46	fNTracks(-1){
ee86d557	47	// default constructor
b0f5e3fc	48	}
ee86d557	49	//______________________________________________________________________
ee86d557	50	AliITSclusterSSD::AliITSclusterSSD(Int_t ndigits, Int_t *DigitIndexes,
e56160b8	51	TObjArray *Digits, Bool_t side):
	52	fSide(side),
	53	fDigits(Digits),
	54	fNDigits(ndigits),
	55	fDigitsIndex(0),
	56	fNCrosses(0),
	57	fCrossedClusterIndexes(0),
	58	fLeftNeighbour(kFALSE),
	59	fRightNeighbour(kFALSE),
	60	fConsumed(kFALSE),
	61	fTotalSignal(-1),
	62	fNTracks(-1){
ee86d557	63	// non-default constructor
b0f5e3fc	64
ee86d557	65	fDigitsIndex = new TArrayI(fNDigits,DigitIndexes );
ee86d557	66	fCrossedClusterIndexes = new TArrayI(300);
b0f5e3fc	67	}
ee86d557	68	//______________________________________________________________________
	69	AliITSclusterSSD::~AliITSclusterSSD(){
	70	// destructor
f239b2fe	71
ee86d557	72	delete fDigitsIndex;
	73	delete fCrossedClusterIndexes;
	74	}
	75	//______________________________________________________________________
ac74f489	76	AliITSclusterSSD::AliITSclusterSSD(const AliITSclusterSSD &OneSCluster) :
e56160b8	77	TObject(OneSCluster),
	78	fSide(OneSCluster.fSide),
	79	fDigits(OneSCluster.fDigits),
	80	fNDigits(OneSCluster.fNDigits),
	81	fDigitsIndex(0),
	82	fNCrosses(OneSCluster.fNCrosses),
	83	fCrossedClusterIndexes(0),
	84	fLeftNeighbour(OneSCluster.fLeftNeighbour),
	85	fRightNeighbour(OneSCluster.fRightNeighbour),
	86	fConsumed(OneSCluster.fConsumed),
	87	fTotalSignal(-1),
	88	fNTracks(-1){
ee86d557	89	// copy constructor
b0f5e3fc	90
ee86d557	91	fDigitsIndex = new TArrayI(fNDigits);
ee86d557	92	fTotalSignal =-1;
ee86d557	93	fNTracks = -1;
ee86d557	94	Int_t i;
	95	for (i = 0; i< fNCrosses ; i++){
	96	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	97	}
	98	for (i = 0; i< fNDigits ; i++){
	99	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	100	}
	101	return;
	102	}
	103	//______________________________________________________________________
	104	AliITSclusterSSD& AliITSclusterSSD::operator=(const AliITSclusterSSD
	105	&OneSCluster){
	106	// assignment operator
f239b2fe	107
ee86d557	108	if (this == &OneSCluster) return *this;
	109	fNDigits = OneSCluster.fNDigits;
	110	fSide=OneSCluster.fSide;
	111	fDigits=OneSCluster.fDigits;
	112	fDigitsIndex = new TArrayI(fNDigits);
	113	fLeftNeighbour = OneSCluster.fLeftNeighbour;
	114	fRightNeighbour = OneSCluster.fRightNeighbour;
	115	fTotalSignal =-1;
	116	fNTracks = -1;
	117	fNCrosses = OneSCluster.fNCrosses;
	118	fConsumed = OneSCluster.fConsumed;
	119	Int_t i;
	120	for (i = 0; i< fNCrosses ; i++){
	121	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	122	}
	123	for (i = 0; i< fNDigits ; i++){
	124	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	125	}
	126	return *this;
	127	}
	128	//______________________________________________________________________
	129	Int_t AliITSclusterSSD::SplitCluster(Int_t where, Int_t *outdigits){
	130	//This methods generate data necessery to make new object of this class
	131	//I choosen this way, because methods TClonesArray::Add* dont work
	132	//so I have to use constraction: new (a[i]) Creator(params...);
	133	//where 'a' is a TClonesArray
	134	//This method generate params - see AliITSmoduleSSD::SplitCluster;
	135	Int_t tmp = fNDigits;
	136	Int_t ind = 0;
b0f5e3fc	137
b0f5e3fc	138	outdigits[ind++]=(*fDigitsIndex)[where];
ee86d557	139	//coping border strip (it is shared by this two clusters)
	140	for (Int_t i = (where+1); i < tmp; i++) {
	141	outdigits[ind++]=(*fDigitsIndex)[i];
	142	//"moving" strips from this to the new one
	143	(*fDigitsIndex)[i]=-1;
	144	fNDigits--; //deleting strips from this cluster
	145	}
	146	return ind;
b0f5e3fc	147	}
ee86d557	148	//______________________________________________________________________
	149	Int_t AliITSclusterSSD::GetDigitStripNo(Int_t digit){
	150	// return strip no of a digit
	151	if (digit<0) return -1;
	152	return (digit>(fNDigits-1)) ? -1 :
	153	((AliITSdigitSSD)(fDigits->At((fDigitsIndex)[digit])))->GetStripNumber();
b0f5e3fc	154	}
ee86d557	155	//______________________________________________________________________
	156	Int_t AliITSclusterSSD::GetDigitSignal(Int_t digit){
	157	// returns digit signal
	158	Int_t index,signal;
	159	if (digit<0\|\|digit>=fNDigits) return -1;
	160	index = (*fDigitsIndex)[digit];
	161	signal = ((AliITSdigitSSD*)(fDigits->At(index)))->GetSignal();
	162	/*
	163	if(signal>1.e5) printf("GetDigitSignal: digit %d index %d signal %d\n",
	164	digit,index, signal);
	165	*/
	166	return signal;
b0f5e3fc	167	}
ee86d557	168	//______________________________________________________________________
	169	void AliITSclusterSSD::AddCross(Int_t clIndex){
	170	// add cluster cross to list of cluster crosses
766ef0c8	171
ee86d557	172	(*fCrossedClusterIndexes)[fNCrosses++] = clIndex;
b0f5e3fc	173	}
ee86d557	174	//______________________________________________________________________
7d62fb64	175	Int_t AliITSclusterSSD::GetCross(Int_t crIndex) const {
ee86d557	176	// return crossing cluster
b0f5e3fc	177
ee86d557	178	return ((crIndex>-1)&&(crIndex<fNCrosses))?(*fCrossedClusterIndexes)[crIndex]:-1;
b0f5e3fc	179	}
ee86d557	180	//______________________________________________________________________
	181	Double_t AliITSclusterSSD::CentrOfGravity(){
	182	// return center of gravity of the cluster
	183	Float_t ret=0;
b0f5e3fc	184
ee86d557	185	if (fLeftNeighbour) ret+=(GetDigitStripNo(0)0.5GetDigitSignal(0));
	186	else ret+=(GetDigitStripNo(0)*GetDigitSignal(0));
	187	if (fRightNeighbour) ret+=(GetDigitStripNo(fNDigits -1)0.5GetDigitSignal(fNDigits -1));
	188	else ret+=(GetDigitStripNo(fNDigits -1)*GetDigitSignal(fNDigits-1));
	189	for (Int_t i=1;i<fNDigits-1;i++){
	190	ret +=GetDigitStripNo(i)*GetDigitSignal(i);
	191	}// end for i
b0f5e3fc	192
ee86d557	193	if (fTotalSignal<0) GetTotalSignal();
b0f5e3fc	194
	195	return (ret/fTotalSignal);
	196	}
ee86d557	197	//______________________________________________________________________
	198	Float_t AliITSclusterSSD::GetTotalSignal(){
	199	// return total signal
766ef0c8	200
ee86d557	201	if(fTotalSignal <0){
	202	fTotalSignal=0;
	203	if (fNDigits ==1) {
	204	fTotalSignal = (Float_t)GetDigitSignal(0);
	205	//printf("1 digit: signal %d \n",GetDigitSignal(0));
	206	return fTotalSignal;
	207	}
	208	if (fLeftNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(0));
	209	else fTotalSignal += (Float_t) GetDigitSignal(0);
	210	//printf("GetTotalSignal :i DigitSignal %d %d \n",0,GetDigitSignal(0));
	211	if (fRightNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(
	212	fNDigits -1));
b0f5e3fc	213	else fTotalSignal += (Float_t)GetDigitSignal(fNDigits-1);
ee86d557	214	//printf("GetTotalSignal :i DigitSignal %d %d \n",fNDigits -1,GetDigitSignal(fNDigits -1));
	215	for (Int_t i = 1;i<fNDigits -1;i++){
	216	fTotalSignal += (Float_t)GetDigitSignal(i);
	217	//printf("GetTotalSignal :i DigitSignal %d %d \n",i,GetDigitSignal(i));
b0f5e3fc	218	}
ee86d557	219	//printf("GetTotalSignal: fNDigits %d fTotalSignal %.0f \n",fNDigits,fTotalSignal);
b0f5e3fc	220	}
ee86d557	221	return fTotalSignal;
b0f5e3fc	222	}
ee86d557	223	//______________________________________________________________________
	224	Float_t AliITSclusterSSD::GetTotalSignalError(){
	225	// return the error on the signal
	226	Float_t err =0;
	227	for (Int_t i =1; i<fNDigits -1; i++){
	228	err+=0.1*GetDigitSignal(i);
b0f5e3fc	229	}
ee86d557	230	if (GetLeftNeighbour()){
	231	err+=GetDigitSignal(0);
	232	}else{
	233	err+=0.1*GetDigitSignal(0);
	234	}
	235	if (GetRightNeighbour()){
	236	err+=GetDigitSignal(fNDigits -1);
	237	}else{
	238	err+=0.1*GetDigitSignal(fNDigits -1);
	239	}
	240	return err;
b0f5e3fc	241	}
ee86d557	242	//______________________________________________________________________
	243	void AliITSclusterSSD::DelCross(Int_t index){
	244	// remove cross clusters from the list of cross clusters
	245	Int_t i,j; //iterators
b0f5e3fc	246
ee86d557	247	for (i =0;i<fNCrosses;i++){
	248	if ((*fCrossedClusterIndexes)[i] == index){
	249	for (j=i;j<fNCrosses-1;j++){
	250	(fCrossedClusterIndexes)[j]=(fCrossedClusterIndexes)[j+1];
	251	}
	252	fNCrosses--;
	253	return;
	254	}
	255	}
b0f5e3fc	256	}
ee86d557	257	//______________________________________________________________________
	258	Int_t *AliITSclusterSSD::GetTracks(Int_t &nt){
	259	// return the track number of the cluster
f8d9a5b8	260	Int_t ntrk = GetDigit(0)->GetNTracks();
	261	Int_t ndig = GetNumOfDigits();
	262	Int_t *idig = new Int_t[ndig];
	263	Int_t *sdig = new Int_t[ndig];
	264	Int_t itrk = new Int_t[ndigntrk];
	265	Int_t i,j,k,l,trk;
	266	Bool_t b;
	267
	268	for(i=0;i<ndig;i++){idig[i] = i;sdig[i] = GetDigit(i)->GetSignal();}
	269	TMath::Sort(ndig,sdig,idig,kTRUE);
	270	for(i=0;i<ndig*ntrk;i++) itrk[i] = -3;
	271	j = k = l = 0;
	272	for(i=0;i<ndig;i++){ // fill itrk with track numbers in order of digit size
	273	j = idig[i];
	274	for(k=0;k<ntrk;k++) if((trk = GetDigit(j)->GetTrack(k))>=0) {
	275	itrk[l] = trk;
	276	l++;
	277	} // end for k/if
	278	} // end for i
	279	for(i=0;i<10;i++) fTrack[i] = -3;
	280	fTrack[0] = itrk[0]; // first element
	281	k = 1;
	282	b = kTRUE;
	283	for(i=1;i<l;i++){
	284	for(j=0;j<k;j++) if(fTrack[j]==itrk[i]) b = kFALSE;
	285	if(b){fTrack[k] = itrk[i]; k++;}
	286	if(k>9) break;
	287	} // end for i
	288	nt = k;
	289
	290	delete[] idig;
	291	delete[] sdig;
	292	delete[] itrk;
	293
	294	return fTrack;
	295	/*
ee86d557	296	Int_t *tidx=0;
	297	Int_t i, j,n;
	298	Int_t bit =0;
	299	Int_t ntracks=0;
	300	nt=0;
b0f5e3fc	301
ee86d557	302	for (i=0;i<10;i++) fTrack[i] = -3;
b0f5e3fc	303
ee86d557	304	//cout<<"GetTrack start -------: fNDigits ="<<fNDigits<<endl;
b0f5e3fc	305
ee86d557	306	for (i = 0; i<fNDigits; i++) {
	307	tidx = GetDigit(i)->GetTracks();
	308	n = GetDigit(i)->GetNTracks();
	309	for (j = 0; j<n && j<10;j++) {
	310	if (tidx[j] >= 0) {
	311	if(ntracks == 0){
	312	fTrack[ntracks] = tidx[j];
	313	ntracks++;
	314	}else if(tidx[j] != fTrack[ntracks-1]){
	315	ntracks++;
	316	if(ntracks > 9) {
	317	bit = 1;
	318	break;
	319	} // end if ntracks > 9
	320	fTrack[ntracks-1] = tidx[j];
	321	} // end if ntracke == 0
	322	} // end if tidx[j] >=0
	323	} // 3-tracks loop for the digit
	324	if(bit == 1) break;
	325	} // digit loop
f239b2fe	326
ee86d557	327	SetNTracks(ntracks);
	328	nt = ntracks;
	329	return &(fTrack[0]);
f8d9a5b8	330	*/
b0f5e3fc	331	}
ee86d557	332	//______________________________________________________________________
	333	Double_t AliITSclusterSSD::GetPosition(){
	334	// return position of the cluster
	335	Float_t ret;
b0f5e3fc	336
ee86d557	337	switch(fNDigits){
	338	case 1:
	339	ret = GetDigitStripNo(0);
	340	break;
	341	case 2:
	342	ret = EtaAlgorithm();
	343	break;
	344	default:
	345	ret = CentrOfGravity();
	346	}
	347	return ret;
b0f5e3fc	348	}
ee86d557	349	//______________________________________________________________________
	350	Double_t AliITSclusterSSD::EtaAlgorithm(){
	351	// algorithm for determing cluster position
	352	if (fNDigits != 2) return -1;
b0f5e3fc	353
ee86d557	354	Int_t strip1 = GetDigit(0)->GetStripNumber();
	355	Int_t strip2 = GetDigit(1)->GetStripNumber();
	356	Int_t signal1 = GetDigit(0)->GetSignal();
	357	Int_t signal2 = GetDigit(1)->GetSignal();
b0f5e3fc	358
ee86d557	359	Double_t eta;
b0f5e3fc	360
b0f5e3fc	361
ee86d557	362	if (strip1<strip2){
	363	eta = ((Double_t)signal2)/((Double_t)(signal1+signal2));
	364	if (eta<0.04) return strip1;
	365	if (eta>0.96) return strip2;
	366	return (strip1 + 0.43478261*eta + 0.2826087);
	367	} else{
	368	eta = ((Double_t)signal1)/((Double_t)(signal1+signal2));
	369	if (eta<0.04) return strip2;
	370	if (eta>0.96) return strip1;
	371	return (strip2 + 0.43478261*eta + 0.2826087);
	372	}
b0f5e3fc	373	}
ee86d557	374	//______________________________________________________________________
7d62fb64	375	Double_t AliITSclusterSSD::GetPositionError() const {
ee86d557	376	// return the position error
ee86d557	377	return (GetNumOfDigits()+1)/2;
b0f5e3fc	378	}
ee86d557	379	//______________________________________________________________________
7d62fb64	380	Bool_t AliITSclusterSSD::IsCrossingWith(Int_t idx) const{
ee86d557	381	// return the cluster to which he crosses
b0f5e3fc	382
ee86d557	383	for (Int_t i =0; i< fNCrosses;i++){
	384	if (GetCross(i) == idx) return kTRUE;
	385	}
	386	return kFALSE;
b0f5e3fc	387	}