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

#include <iostream.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;
	fNTrack      = -1;
	fLeftNeighbour  = kFALSE;
	fRightNeighbour = kFALSE;
	fCrossedClusterIndexes = new TArrayI(300);
	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;
	fNTrack      = -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;
  fNTrack      = -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;
  fNTrack      = -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)[(*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)[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);
    }
  
  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 *tidx=0;
  Int_t i, bit;
  nt=0;

  
   
   fNTrack =0;
   for (i=0;i<10;i++)
    {
     fTrack[i] = 0;
    }
   
   tidx=GetDigit(0)->GetTracks();
	 
   for (i = 0; i<3;i++)
   {
    fTrack[i]=tidx[i];
    if (fTrack[i] != 0) fNTrack++;
   }
   for (i = 1; i<fNDigits; i++)
   {
    tidx=GetDigit(i)->GetTracks();
    for (Int_t j = 0; j<3;j++)
    {
     bit = 1;
     if (tidx[j]==0) break;
     for (Int_t k = 0; k < fNTrack;k++)
      {
       if (tidx[j]==fTrack[k]) bit =0;
      }
     if (bit) fTrack[fNTrack++]=tidx[j];	
    }
   }
	
 
  if (fNTrack > 10)
   {
     cout<<"\n\n Error AliITSclusterSSD::GetTracks  OUT  "<<fNDigits<<"   "<<fNTrack<<"\n\n\n\n\n";
     
   }

 
 nt = fNTrack;
 if(!nt) return 0;
 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
b0f5e3fc	1	#include <iostream.h>
b0f5e3fc	2
e8189707	3	#include "AliITSdigit.h"
b0f5e3fc	4	#include "AliITSclusterSSD.h"
	5
	6	ClassImp(AliITSclusterSSD)
	7
	8	AliITSclusterSSD::AliITSclusterSSD()
	9	{
	10	// default constructor
e8189707	11	fSide = kTRUE;
b0f5e3fc	12	fDigits = 0;
	13	fNDigits = 0;
	14	fDigitsIndex = 0;
	15	fNCrosses = 0;
	16	fTotalSignal = -1;
	17	fNTrack = -1;
	18	fLeftNeighbour = kFALSE;
	19	fRightNeighbour = kFALSE;
	20	fCrossedClusterIndexes = new TArrayI(300);
	21	fConsumed=kFALSE;
	22
	23	}
	24	/*************************************************************************/
	25
	26	AliITSclusterSSD::AliITSclusterSSD
	27	(Int_t ndigits, Int_t *DigitIndexes,
	28	TObjArray *Digits, Bool_t side)
	29	{
766ef0c8	30	// non-default constructor
766ef0c8	31
b0f5e3fc	32	fNDigits = ndigits;
	33	fDigits = Digits;
	34	fSide = side;
	35	fDigitsIndex = new TArrayI(fNDigits,DigitIndexes );
	36	fNCrosses = 0;
	37	fCrossedClusterIndexes = new TArrayI(300);
	38	fLeftNeighbour = kFALSE;
	39	fRightNeighbour = kFALSE;
	40	fTotalSignal =-1;
	41	fNTrack = -1;
	42	fConsumed=kFALSE;
	43	}
	44	/*************************************************************************/
	45	AliITSclusterSSD::~AliITSclusterSSD()
	46	{
	47	// destructor
	48	delete fDigitsIndex;
	49	delete fCrossedClusterIndexes;
	50	}
	51
	52	/*************************************************************************/
	53	AliITSclusterSSD::AliITSclusterSSD(const AliITSclusterSSD &OneSCluster)
	54	{
	55	// copy constructor
	56	if (this == &OneSCluster) return;
	57	fNDigits = OneSCluster.fNDigits;
	58	fSide=OneSCluster.fSide;
	59	fDigits=OneSCluster.fDigits;
	60	fDigitsIndex = new TArrayI(fNDigits);
	61	fLeftNeighbour = OneSCluster.fLeftNeighbour;
	62	fRightNeighbour = OneSCluster.fRightNeighbour;
	63	fTotalSignal =-1;
	64	fNTrack = -1;
	65	fNCrosses = OneSCluster.fNCrosses;
	66	fConsumed = OneSCluster.fConsumed;
	67	Int_t i;
e8189707	68	for (i = 0; i< fNCrosses ; i++)
b0f5e3fc	69	{
	70	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	71	}
e8189707	72	for (i = 0; i< fNDigits ; i++)
b0f5e3fc	73	{
	74	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	75	}
	76	return;
	77	}
	78
	79	/*************************************************************************/
	80	AliITSclusterSSD& AliITSclusterSSD::operator=(const AliITSclusterSSD & OneSCluster)
	81	{
	82	// assignment operator
	83	if (this == &OneSCluster) return *this;
	84	fNDigits = OneSCluster.fNDigits;
	85	fSide=OneSCluster.fSide;
	86	fDigits=OneSCluster.fDigits;
	87	fDigitsIndex = new TArrayI(fNDigits);
	88	fLeftNeighbour = OneSCluster.fLeftNeighbour;
	89	fRightNeighbour = OneSCluster.fRightNeighbour;
	90	fTotalSignal =-1;
	91	fNTrack = -1;
	92	fNCrosses = OneSCluster.fNCrosses;
	93	fConsumed = OneSCluster.fConsumed;
	94	Int_t i;
e8189707	95	for (i = 0; i< fNCrosses ; i++)
b0f5e3fc	96	{
	97	fCrossedClusterIndexes[i] = OneSCluster.fCrossedClusterIndexes[i];
	98	}
e8189707	99	for (i = 0; i< fNDigits ; i++)
b0f5e3fc	100	{
	101	fDigitsIndex[i]=OneSCluster.fDigitsIndex[i];
	102	}
	103	return *this;
	104	}
	105
	106	/*************************************************************************/
	107	Int_t AliITSclusterSSD::SplitCluster(Int_t where, Int_t *outdigits)
	108	{
	109	//This methods generate data necessery to make new object of this class
	110	//I choosen this way, because methods TClonesArray::Add* dont work
	111	//so I have to use constraction: new (a[i]) Creator(params...);
	112	//where 'a' is a TClonesArray
	113	//This method generate params - see AliITSmoduleSSD::SplitCluster;
	114
	115
	116	Int_t tmp = fNDigits;
	117	Int_t ind = 0;
	118	outdigits[ind++]=(*fDigitsIndex)[where];
	119	//coping border strip (it is shared by this two clusters)
e8189707	120	for (Int_t i = (where+1); i < tmp; i++)
b0f5e3fc	121	{
	122	outdigits[ind++]=(*fDigitsIndex)[i]; //"moving" strips from this to the new one
	123	(*fDigitsIndex)[i]=-1;
	124	fNDigits--; //deleting strips from this cluster
	125	}
	126	return ind;
	127	}
	128
	129	/*******************************************************************/
	130	Int_t AliITSclusterSSD::GetDigitStripNo(Int_t digit)
	131	{
766ef0c8	132	// return strip no of a digit
b0f5e3fc	133	if (digit<0) return -1;
	134	return (digit>(fNDigits-1))?-1 :
	135	((AliITSdigitSSD)((fDigits)[(*fDigitsIndex)[digit]]))->GetStripNumber();
	136	}
	137	/************************************************************/
	138	Int_t AliITSclusterSSD::GetDigitSignal(Int_t digit)
	139	{
b0f5e3fc	140	// returns digit signal
766ef0c8	141	Int_t index,signal;
b0f5e3fc	142	if (digit<0\|\|digit>=fNDigits) return -1;
	143	index = (*fDigitsIndex)[digit];
	144	signal = ((AliITSdigitSSD)((fDigits)[index]))->GetSignal();
	145	/*
	146	if(signal>1.e5) printf("GetDigitSignal: digit %d index %d signal %d\n",
	147	digit,index, signal);
	148	*/
	149	return signal;
	150	}
	151
	152	/***********************************************************/
	153	void AliITSclusterSSD::AddCross(Int_t clIndex)
	154	{
766ef0c8	155	// add cluster cross to list of cluster crosses
766ef0c8	156
b0f5e3fc	157	(*fCrossedClusterIndexes)[fNCrosses++] = clIndex;
	158	}
	159	/***********************************************************/
	160
	161	Int_t AliITSclusterSSD::GetCross(Int_t crIndex)
	162	{
766ef0c8	163	// return crossing cluster
766ef0c8	164
b0f5e3fc	165	return ((crIndex>-1)&&(crIndex<fNCrosses))?(*fCrossedClusterIndexes)[crIndex]:-1;
	166	}
	167	/***********************************************************/
	168	Double_t AliITSclusterSSD::CentrOfGravity()
	169	{
766ef0c8	170	// return center of gravity of the cluster
b0f5e3fc	171	Float_t ret=0;
	172
	173	if (fLeftNeighbour) ret+=(GetDigitStripNo(0)0.5GetDigitSignal(0));
	174	else ret+=(GetDigitStripNo(0)*GetDigitSignal(0));
	175
	176	if (fRightNeighbour) ret+=(GetDigitStripNo(fNDigits -1)0.5GetDigitSignal(fNDigits -1));
	177	else ret+=(GetDigitStripNo(fNDigits -1)*GetDigitSignal(fNDigits-1));
e8189707	178
e8189707	179	for (Int_t i=1;i<fNDigits-1;i++)
b0f5e3fc	180	{
	181	ret +=GetDigitStripNo(i)*GetDigitSignal(i);
	182	}
	183
	184	if (fTotalSignal<0) GetTotalSignal();
	185
	186	return (ret/fTotalSignal);
	187	}
	188
	189	/***********************************************************/
	190	Float_t AliITSclusterSSD::GetTotalSignal()
	191	{
766ef0c8	192	// return total signal
766ef0c8	193
b0f5e3fc	194	if(fTotalSignal <0)
	195	{
	196	fTotalSignal=0;
	197	if (fNDigits ==1) {
	198	fTotalSignal = (Float_t)GetDigitSignal(0);
	199	//printf("1 digit: signal %d \n",GetDigitSignal(0));
	200	return fTotalSignal;
	201	}
	202
	203	if (fLeftNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(0));
	204	else fTotalSignal += (Float_t) GetDigitSignal(0);
	205	//printf("GetTotalSignal :i DigitSignal %d %d \n",0,GetDigitSignal(0));
	206
	207	if (fRightNeighbour) fTotalSignal += (Float_t)(0.5*GetDigitSignal(fNDigits -1));
	208	else fTotalSignal += (Float_t)GetDigitSignal(fNDigits-1);
	209	//printf("GetTotalSignal :i DigitSignal %d %d \n",fNDigits -1,GetDigitSignal(fNDigits -1));
e8189707	210
e8189707	211	for (Int_t i = 1;i<fNDigits -1;i++)
b0f5e3fc	212	{
	213	fTotalSignal += (Float_t)GetDigitSignal(i);
	214	//printf("GetTotalSignal :i DigitSignal %d %d \n",i,GetDigitSignal(i));
	215	}
	216	//printf("GetTotalSignal: fNDigits %d fTotalSignal %.0f \n",fNDigits,fTotalSignal);
	217	}
	218	return fTotalSignal;
	219	}
	220	/***********************************************************/
	221
	222	Float_t AliITSclusterSSD::GetTotalSignalError()
	223	{
766ef0c8	224	// return the error on the signal
b0f5e3fc	225	Float_t err =0;
e8189707	226	for (Int_t i =1; i<fNDigits -1; i++)
b0f5e3fc	227	{
	228	err+=0.1*GetDigitSignal(i);
	229	}
	230	if (GetLeftNeighbour())
	231	{
	232	err+=GetDigitSignal(0);
	233	}
	234	else
	235	{
	236	err+=0.1*GetDigitSignal(0);
	237	}
	238	if (GetRightNeighbour())
	239	{
	240	err+=GetDigitSignal(fNDigits -1);
	241	}
	242	else
	243	{
	244	err+=0.1*GetDigitSignal(fNDigits -1);
	245	}
	246	return err;
	247
	248	}
	249
	250	/***********************************************************/
	251
	252	void AliITSclusterSSD::DelCross(Int_t index)
	253	{
766ef0c8	254	// remove cross clusters from the list of cross clusters
b0f5e3fc	255	Int_t i,j; //iterators
b0f5e3fc	256
e8189707	257	for (i =0;i<fNCrosses;i++)
b0f5e3fc	258	{
	259	if ((*fCrossedClusterIndexes)[i] == index)
	260	{
e8189707	261	for (j=i;j<fNCrosses-1;j++)
b0f5e3fc	262	{
	263	(fCrossedClusterIndexes)[j]=(fCrossedClusterIndexes)[j+1];
	264	}
	265	fNCrosses--;
	266	return;
	267	}
	268	}
	269
	270	}
	271	/***********************************************************/
	272
	273	Int_t *AliITSclusterSSD::GetTracks(Int_t &nt)
	274	{
766ef0c8	275	// return the track number of the cluster
b0f5e3fc	276	Int_t *tidx=0;
	277	Int_t i, bit;
	278	nt=0;
	279
	280
	281
	282	fNTrack =0;
e8189707	283	for (i=0;i<10;i++)
b0f5e3fc	284	{
	285	fTrack[i] = 0;
	286	}
	287
	288	tidx=GetDigit(0)->GetTracks();
	289
e8189707	290	for (i = 0; i<3;i++)
b0f5e3fc	291	{
	292	fTrack[i]=tidx[i];
	293	if (fTrack[i] != 0) fNTrack++;
	294	}
e8189707	295	for (i = 1; i<fNDigits; i++)
b0f5e3fc	296	{
b0f5e3fc	297	tidx=GetDigit(i)->GetTracks();
e8189707	298	for (Int_t j = 0; j<3;j++)
b0f5e3fc	299	{
	300	bit = 1;
	301	if (tidx[j]==0) break;
e8189707	302	for (Int_t k = 0; k < fNTrack;k++)
b0f5e3fc	303	{
	304	if (tidx[j]==fTrack[k]) bit =0;
	305	}
	306	if (bit) fTrack[fNTrack++]=tidx[j];
	307	}
	308	}
	309
	310
	311	if (fNTrack > 10)
	312	{
	313	cout<<"\n\n Error AliITSclusterSSD::GetTracks OUT "<<fNDigits<<" "<<fNTrack<<"\n\n\n\n\n";
	314
	315	}
	316
	317
	318	nt = fNTrack;
	319	if(!nt) return 0;
	320	return &(fTrack[0]);
	321	}
	322	/***********************************************************/
	323
	324	Double_t AliITSclusterSSD::GetPosition()
	325	{
766ef0c8	326	// return position of the cluster
b0f5e3fc	327	Float_t ret;
	328	switch(fNDigits)
	329	{
	330	case 1:
	331	ret = GetDigitStripNo(0);
	332	break;
	333	case 2:
	334	ret = EtaAlgorithm();
	335	break;
	336	default:
	337	ret = CentrOfGravity();
	338	}
	339	return ret;
	340	}
	341
	342	/***********************************************************/
	343
	344	Double_t AliITSclusterSSD::EtaAlgorithm()
	345	{
766ef0c8	346	// algorithm for determing cluster position
b0f5e3fc	347	if (fNDigits != 2) return -1;
	348
	349	Int_t strip1 = GetDigit(0)->GetStripNumber();
	350	Int_t strip2 = GetDigit(1)->GetStripNumber();
	351	Int_t signal1 = GetDigit(0)->GetSignal();
	352	Int_t signal2 = GetDigit(1)->GetSignal();
	353
	354	Double_t eta;
	355
	356
	357	if (strip1<strip2)
	358	{
	359	eta = ((Double_t)signal2)/((Double_t)(signal1+signal2));
	360	if (eta<0.04) return strip1;
	361	if (eta>0.96) return strip2;
	362	return (strip1 + 0.43478261*eta + 0.2826087);
	363	}
	364	else
	365	{
	366	eta = ((Double_t)signal1)/((Double_t)(signal1+signal2));
	367	if (eta<0.04) return strip2;
	368	if (eta>0.96) return strip1;
	369	return (strip2 + 0.43478261*eta + 0.2826087);
	370	}
	371
	372
	373	}
	374
	375	Double_t AliITSclusterSSD::GetPositionError()
	376	{
766ef0c8	377	// return the position error
b0f5e3fc	378	return (GetNumOfDigits()+1)/2;
	379	}
	380
	381	Bool_t AliITSclusterSSD::IsCrossingWith(Int_t idx)
	382	{
766ef0c8	383	// return the cluster to which he crosses
e8189707	384	for (Int_t i =0; i< fNCrosses;i++)
b0f5e3fc	385	{
	386	if (GetCross(i) == idx) return kTRUE;
	387	}
	388	return kFALSE;
	389	}