[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.                  *
 **************************************************************************/

/*
$Log$
Revision 1.10  2002/10/22 14:45:37  alibrary
Introducing Riostream.h

Revision 1.9  2002/10/14 14:57:00  hristov
Merging the VirtualMC branch to the main development branch (HEAD)

Revision 1.7.6.1  2002/10/14 13:14:08  hristov
Updating VirtualMC to v3-09-02

Revision 1.8  2002/09/09 17:23:28  nilsen
Minor changes in support of changes to AliITSdigitS?D class'.

*/

#include <Riostream.h>
#include "TArrayI.h"
#include "TClonesArray.h"
#include "AliITSdigit.h"
#include "AliITSclusterSSD.h"

ClassImp(AliITSclusterSSD)

//______________________________________________________________________
AliITSclusterSSD::AliITSclusterSSD(){
    // default constructor

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

    fNDigits = ndigits;
    fDigits = Digits;
    fSide = side;
    fDigitsIndex = new TArrayI(fNDigits,DigitIndexes );	
    fNCrosses    = 0;
    fCrossedClusterIndexes = new TArrayI(300);
    fLeftNeighbour  = kFALSE;
    fRightNeighbour = kFALSE;
    fTotalSignal =-1;
    fNTracks    = -1;
    fConsumed=kFALSE;
}
//______________________________________________________________________
AliITSclusterSSD::~AliITSclusterSSD(){
    // destructor

    delete fDigitsIndex;
    delete fCrossedClusterIndexes;
}
//______________________________________________________________________
AliITSclusterSSD::AliITSclusterSSD(const AliITSclusterSSD &OneSCluster){
    // copy constructor

    if (this == &OneSCluster) return;
    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;
}
//______________________________________________________________________
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){
    // 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(){
    // return the position error
    return (GetNumOfDigits()+1)/2;
}
//______________________________________________________________________
Bool_t AliITSclusterSSD::IsCrossingWith(Int_t idx){
    // 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
	16	/*
	17	$Log$
f8d9a5b8	18	Revision 1.10 2002/10/22 14:45:37 alibrary
	19	Introducing Riostream.h
	20
4ae5bbc4	21	Revision 1.9 2002/10/14 14:57:00 hristov
	22	Merging the VirtualMC branch to the main development branch (HEAD)
	23
b9d0a01d	24	Revision 1.7.6.1 2002/10/14 13:14:08 hristov
	25	Updating VirtualMC to v3-09-02
	26
	27	Revision 1.8 2002/09/09 17:23:28 nilsen
	28	Minor changes in support of changes to AliITSdigitS?D class'.
	29
ee86d557	30	*/
ee86d557	31
4ae5bbc4	32	#include <Riostream.h>
ee86d557	33	#include "TArrayI.h"
ee86d557	34	#include "TClonesArray.h"
e8189707	35	#include "AliITSdigit.h"
b0f5e3fc	36	#include "AliITSclusterSSD.h"
	37
	38	ClassImp(AliITSclusterSSD)
	39
ee86d557	40	//______________________________________________________________________
	41	AliITSclusterSSD::AliITSclusterSSD(){
	42	// default constructor
b0f5e3fc	43
ee86d557	44	fSide = kTRUE;
	45	fDigits = 0;
	46	fNDigits = 0;
	47	fDigitsIndex = 0;
	48	fNCrosses = 0;
	49	fTotalSignal = -1;
	50	fNTracks = -1;
	51	fLeftNeighbour = kFALSE;
	52	fRightNeighbour = kFALSE;
	53	fCrossedClusterIndexes = 0;
	54	fConsumed=kFALSE;
b0f5e3fc	55	}
ee86d557	56	//______________________________________________________________________
	57	AliITSclusterSSD::AliITSclusterSSD(Int_t ndigits, Int_t *DigitIndexes,
	58	TObjArray *Digits, Bool_t side){
	59	// non-default constructor
b0f5e3fc	60
ee86d557	61	fNDigits = ndigits;
	62	fDigits = Digits;
	63	fSide = side;
	64	fDigitsIndex = new TArrayI(fNDigits,DigitIndexes );
	65	fNCrosses = 0;
	66	fCrossedClusterIndexes = new TArrayI(300);
	67	fLeftNeighbour = kFALSE;
	68	fRightNeighbour = kFALSE;
	69	fTotalSignal =-1;
	70	fNTracks = -1;
	71	fConsumed=kFALSE;
b0f5e3fc	72	}
ee86d557	73	//______________________________________________________________________
	74	AliITSclusterSSD::~AliITSclusterSSD(){
	75	// destructor
f239b2fe	76
ee86d557	77	delete fDigitsIndex;
	78	delete fCrossedClusterIndexes;
	79	}
	80	//______________________________________________________________________
	81	AliITSclusterSSD::AliITSclusterSSD(const AliITSclusterSSD &OneSCluster){
	82	// copy constructor
b0f5e3fc	83
ee86d557	84	if (this == &OneSCluster) return;
	85	fNDigits = OneSCluster.fNDigits;
	86	fSide=OneSCluster.fSide;
	87	fDigits=OneSCluster.fDigits;
	88	fDigitsIndex = new TArrayI(fNDigits);
	89	fLeftNeighbour = OneSCluster.fLeftNeighbour;
	90	fRightNeighbour = OneSCluster.fRightNeighbour;
	91	fTotalSignal =-1;
	92	fNTracks = -1;
	93	fNCrosses = OneSCluster.fNCrosses;
	94	fConsumed = OneSCluster.fConsumed;
	95	Int_t i;
	96	for (i = 0; i< fNCrosses ; i++){
	97	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	98	}
	99	for (i = 0; i< fNDigits ; i++){
	100	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	101	}
	102	return;
	103	}
	104	//______________________________________________________________________
	105	AliITSclusterSSD& AliITSclusterSSD::operator=(const AliITSclusterSSD
	106	&OneSCluster){
	107	// assignment operator
f239b2fe	108
ee86d557	109	if (this == &OneSCluster) return *this;
	110	fNDigits = OneSCluster.fNDigits;
	111	fSide=OneSCluster.fSide;
	112	fDigits=OneSCluster.fDigits;
	113	fDigitsIndex = new TArrayI(fNDigits);
	114	fLeftNeighbour = OneSCluster.fLeftNeighbour;
	115	fRightNeighbour = OneSCluster.fRightNeighbour;
	116	fTotalSignal =-1;
	117	fNTracks = -1;
	118	fNCrosses = OneSCluster.fNCrosses;
	119	fConsumed = OneSCluster.fConsumed;
	120	Int_t i;
	121	for (i = 0; i< fNCrosses ; i++){
	122	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	123	}
	124	for (i = 0; i< fNDigits ; i++){
	125	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	126	}
	127	return *this;
	128	}
	129	//______________________________________________________________________
	130	Int_t AliITSclusterSSD::SplitCluster(Int_t where, Int_t *outdigits){
	131	//This methods generate data necessery to make new object of this class
	132	//I choosen this way, because methods TClonesArray::Add* dont work
	133	//so I have to use constraction: new (a[i]) Creator(params...);
	134	//where 'a' is a TClonesArray
	135	//This method generate params - see AliITSmoduleSSD::SplitCluster;
	136	Int_t tmp = fNDigits;
	137	Int_t ind = 0;
b0f5e3fc	138
b0f5e3fc	139	outdigits[ind++]=(*fDigitsIndex)[where];
ee86d557	140	//coping border strip (it is shared by this two clusters)
	141	for (Int_t i = (where+1); i < tmp; i++) {
	142	outdigits[ind++]=(*fDigitsIndex)[i];
	143	//"moving" strips from this to the new one
	144	(*fDigitsIndex)[i]=-1;
	145	fNDigits--; //deleting strips from this cluster
	146	}
	147	return ind;
b0f5e3fc	148	}
ee86d557	149	//______________________________________________________________________
	150	Int_t AliITSclusterSSD::GetDigitStripNo(Int_t digit){
	151	// return strip no of a digit
	152	if (digit<0) return -1;
	153	return (digit>(fNDigits-1)) ? -1 :
	154	((AliITSdigitSSD)(fDigits->At((fDigitsIndex)[digit])))->GetStripNumber();
b0f5e3fc	155	}
ee86d557	156	//______________________________________________________________________
	157	Int_t AliITSclusterSSD::GetDigitSignal(Int_t digit){
	158	// returns digit signal
	159	Int_t index,signal;
	160	if (digit<0\|\|digit>=fNDigits) return -1;
	161	index = (*fDigitsIndex)[digit];
	162	signal = ((AliITSdigitSSD*)(fDigits->At(index)))->GetSignal();
	163	/*
	164	if(signal>1.e5) printf("GetDigitSignal: digit %d index %d signal %d\n",
	165	digit,index, signal);
	166	*/
	167	return signal;
b0f5e3fc	168	}
ee86d557	169	//______________________________________________________________________
	170	void AliITSclusterSSD::AddCross(Int_t clIndex){
	171	// add cluster cross to list of cluster crosses
766ef0c8	172
ee86d557	173	(*fCrossedClusterIndexes)[fNCrosses++] = clIndex;
b0f5e3fc	174	}
ee86d557	175	//______________________________________________________________________
	176	Int_t AliITSclusterSSD::GetCross(Int_t crIndex){
	177	// return crossing cluster
b0f5e3fc	178
ee86d557	179	return ((crIndex>-1)&&(crIndex<fNCrosses))?(*fCrossedClusterIndexes)[crIndex]:-1;
b0f5e3fc	180	}
ee86d557	181	//______________________________________________________________________
	182	Double_t AliITSclusterSSD::CentrOfGravity(){
	183	// return center of gravity of the cluster
	184	Float_t ret=0;
b0f5e3fc	185
ee86d557	186	if (fLeftNeighbour) ret+=(GetDigitStripNo(0)0.5GetDigitSignal(0));
	187	else ret+=(GetDigitStripNo(0)*GetDigitSignal(0));
	188	if (fRightNeighbour) ret+=(GetDigitStripNo(fNDigits -1)0.5GetDigitSignal(fNDigits -1));
	189	else ret+=(GetDigitStripNo(fNDigits -1)*GetDigitSignal(fNDigits-1));
	190	for (Int_t i=1;i<fNDigits-1;i++){
	191	ret +=GetDigitStripNo(i)*GetDigitSignal(i);
	192	}// end for i
b0f5e3fc	193
ee86d557	194	if (fTotalSignal<0) GetTotalSignal();
b0f5e3fc	195
	196	return (ret/fTotalSignal);
	197	}
ee86d557	198	//______________________________________________________________________
	199	Float_t AliITSclusterSSD::GetTotalSignal(){
	200	// return total signal
766ef0c8	201
ee86d557	202	if(fTotalSignal <0){
	203	fTotalSignal=0;
	204	if (fNDigits ==1) {
	205	fTotalSignal = (Float_t)GetDigitSignal(0);
	206	//printf("1 digit: signal %d \n",GetDigitSignal(0));
	207	return fTotalSignal;
	208	}
	209	if (fLeftNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(0));
	210	else fTotalSignal += (Float_t) GetDigitSignal(0);
	211	//printf("GetTotalSignal :i DigitSignal %d %d \n",0,GetDigitSignal(0));
	212	if (fRightNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(
	213	fNDigits -1));
b0f5e3fc	214	else fTotalSignal += (Float_t)GetDigitSignal(fNDigits-1);
ee86d557	215	//printf("GetTotalSignal :i DigitSignal %d %d \n",fNDigits -1,GetDigitSignal(fNDigits -1));
	216	for (Int_t i = 1;i<fNDigits -1;i++){
	217	fTotalSignal += (Float_t)GetDigitSignal(i);
	218	//printf("GetTotalSignal :i DigitSignal %d %d \n",i,GetDigitSignal(i));
b0f5e3fc	219	}
ee86d557	220	//printf("GetTotalSignal: fNDigits %d fTotalSignal %.0f \n",fNDigits,fTotalSignal);
b0f5e3fc	221	}
ee86d557	222	return fTotalSignal;
b0f5e3fc	223	}
ee86d557	224	//______________________________________________________________________
	225	Float_t AliITSclusterSSD::GetTotalSignalError(){
	226	// return the error on the signal
	227	Float_t err =0;
	228	for (Int_t i =1; i<fNDigits -1; i++){
	229	err+=0.1*GetDigitSignal(i);
b0f5e3fc	230	}
ee86d557	231	if (GetLeftNeighbour()){
	232	err+=GetDigitSignal(0);
	233	}else{
	234	err+=0.1*GetDigitSignal(0);
	235	}
	236	if (GetRightNeighbour()){
	237	err+=GetDigitSignal(fNDigits -1);
	238	}else{
	239	err+=0.1*GetDigitSignal(fNDigits -1);
	240	}
	241	return err;
b0f5e3fc	242	}
ee86d557	243	//______________________________________________________________________
	244	void AliITSclusterSSD::DelCross(Int_t index){
	245	// remove cross clusters from the list of cross clusters
	246	Int_t i,j; //iterators
b0f5e3fc	247
ee86d557	248	for (i =0;i<fNCrosses;i++){
	249	if ((*fCrossedClusterIndexes)[i] == index){
	250	for (j=i;j<fNCrosses-1;j++){
	251	(fCrossedClusterIndexes)[j]=(fCrossedClusterIndexes)[j+1];
	252	}
	253	fNCrosses--;
	254	return;
	255	}
	256	}
b0f5e3fc	257	}
ee86d557	258	//______________________________________________________________________
	259	Int_t *AliITSclusterSSD::GetTracks(Int_t &nt){
	260	// return the track number of the cluster
f8d9a5b8	261	Int_t ntrk = GetDigit(0)->GetNTracks();
	262	Int_t ndig = GetNumOfDigits();
	263	Int_t *idig = new Int_t[ndig];
	264	Int_t *sdig = new Int_t[ndig];
	265	Int_t itrk = new Int_t[ndigntrk];
	266	Int_t i,j,k,l,trk;
	267	Bool_t b;
	268
	269	for(i=0;i<ndig;i++){idig[i] = i;sdig[i] = GetDigit(i)->GetSignal();}
	270	TMath::Sort(ndig,sdig,idig,kTRUE);
	271	for(i=0;i<ndig*ntrk;i++) itrk[i] = -3;
	272	j = k = l = 0;
	273	for(i=0;i<ndig;i++){ // fill itrk with track numbers in order of digit size
	274	j = idig[i];
	275	for(k=0;k<ntrk;k++) if((trk = GetDigit(j)->GetTrack(k))>=0) {
	276	itrk[l] = trk;
	277	l++;
	278	} // end for k/if
	279	} // end for i
	280	for(i=0;i<10;i++) fTrack[i] = -3;
	281	fTrack[0] = itrk[0]; // first element
	282	k = 1;
	283	b = kTRUE;
	284	for(i=1;i<l;i++){
	285	for(j=0;j<k;j++) if(fTrack[j]==itrk[i]) b = kFALSE;
	286	if(b){fTrack[k] = itrk[i]; k++;}
	287	if(k>9) break;
	288	} // end for i
	289	nt = k;
	290
	291	delete[] idig;
	292	delete[] sdig;
	293	delete[] itrk;
	294
	295	return fTrack;
	296	/*
ee86d557	297	Int_t *tidx=0;
	298	Int_t i, j,n;
	299	Int_t bit =0;
	300	Int_t ntracks=0;
	301	nt=0;
b0f5e3fc	302
ee86d557	303	for (i=0;i<10;i++) fTrack[i] = -3;
b0f5e3fc	304
ee86d557	305	//cout<<"GetTrack start -------: fNDigits ="<<fNDigits<<endl;
b0f5e3fc	306
ee86d557	307	for (i = 0; i<fNDigits; i++) {
	308	tidx = GetDigit(i)->GetTracks();
	309	n = GetDigit(i)->GetNTracks();
	310	for (j = 0; j<n && j<10;j++) {
	311	if (tidx[j] >= 0) {
	312	if(ntracks == 0){
	313	fTrack[ntracks] = tidx[j];
	314	ntracks++;
	315	}else if(tidx[j] != fTrack[ntracks-1]){
	316	ntracks++;
	317	if(ntracks > 9) {
	318	bit = 1;
	319	break;
	320	} // end if ntracks > 9
	321	fTrack[ntracks-1] = tidx[j];
	322	} // end if ntracke == 0
	323	} // end if tidx[j] >=0
	324	} // 3-tracks loop for the digit
	325	if(bit == 1) break;
	326	} // digit loop
f239b2fe	327
ee86d557	328	SetNTracks(ntracks);
	329	nt = ntracks;
	330	return &(fTrack[0]);
f8d9a5b8	331	*/
b0f5e3fc	332	}
ee86d557	333	//______________________________________________________________________
	334	Double_t AliITSclusterSSD::GetPosition(){
	335	// return position of the cluster
	336	Float_t ret;
b0f5e3fc	337
ee86d557	338	switch(fNDigits){
	339	case 1:
	340	ret = GetDigitStripNo(0);
	341	break;
	342	case 2:
	343	ret = EtaAlgorithm();
	344	break;
	345	default:
	346	ret = CentrOfGravity();
	347	}
	348	return ret;
b0f5e3fc	349	}
ee86d557	350	//______________________________________________________________________
	351	Double_t AliITSclusterSSD::EtaAlgorithm(){
	352	// algorithm for determing cluster position
	353	if (fNDigits != 2) return -1;
b0f5e3fc	354
ee86d557	355	Int_t strip1 = GetDigit(0)->GetStripNumber();
	356	Int_t strip2 = GetDigit(1)->GetStripNumber();
	357	Int_t signal1 = GetDigit(0)->GetSignal();
	358	Int_t signal2 = GetDigit(1)->GetSignal();
b0f5e3fc	359
ee86d557	360	Double_t eta;
b0f5e3fc	361
b0f5e3fc	362
ee86d557	363	if (strip1<strip2){
	364	eta = ((Double_t)signal2)/((Double_t)(signal1+signal2));
	365	if (eta<0.04) return strip1;
	366	if (eta>0.96) return strip2;
	367	return (strip1 + 0.43478261*eta + 0.2826087);
	368	} else{
	369	eta = ((Double_t)signal1)/((Double_t)(signal1+signal2));
	370	if (eta<0.04) return strip2;
	371	if (eta>0.96) return strip1;
	372	return (strip2 + 0.43478261*eta + 0.2826087);
	373	}
b0f5e3fc	374	}
ee86d557	375	//______________________________________________________________________
	376	Double_t AliITSclusterSSD::GetPositionError(){
	377	// return the position error
	378	return (GetNumOfDigits()+1)/2;
b0f5e3fc	379	}
ee86d557	380	//______________________________________________________________________
	381	Bool_t AliITSclusterSSD::IsCrossingWith(Int_t idx){
	382	// return the cluster to which he crosses
b0f5e3fc	383
ee86d557	384	for (Int_t i =0; i< fNCrosses;i++){
	385	if (GetCross(i) == idx) return kTRUE;
	386	}
	387	return kFALSE;
b0f5e3fc	388	}