[u/mrichter/AliRoot.git] / PHOS / AliPHOSRawDecoderv1.cxx

/**************************************************************************
 * Copyright(c) 2007, 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.                  *
 **************************************************************************/

/* $Id$ */

// This class decodes the stream of ALTRO samples to extract
// the PHOS "digits" of current event. Uses fitting procedure
// to separate reasonable samples
// 
// Typical use case:
//     AliRawReader* rf = new AliRawReaderDate("2006run2211.raw");
//     AliPHOSRawDecoder dc(rf);
//     while (rf->NextEvent()) {
//       dc.SetOldRCUFormat(kTRUE);
//       dc.SubtractPedestals(kTRUE);
//       while ( dc.NextDigit() ) {
//         Int_t module = dc.GetModule();
//         Int_t column = dc.GetColumn();
//         Int_t row = dc.GetRow();
//         Double_t amplitude = dc.GetEnergy();
//         Double_t time = dc.GetTime();
//         Bool_t IsLowGain = dc.IsLowGain();
//            ..........
//       }
//     }

// Author: Dmitri Peressounko

// --- ROOT system ---
#include "TMath.h"
#include "TMinuit.h"

// --- AliRoot header files ---
#include "AliPHOSRawDecoderv1.h"
#include "AliPHOSPulseGenerator.h"


ClassImp(AliPHOSRawDecoderv1)

//-----------------------------------------------------------------------------
  AliPHOSRawDecoderv1::AliPHOSRawDecoderv1():AliPHOSRawDecoder()
{
  //Default constructor.
}

//-----------------------------------------------------------------------------
AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(AliRawReader* rawReader,  AliAltroMapping **mapping):
  AliPHOSRawDecoder(rawReader,mapping)
{
  //Construct a decoder object.
  //Is is user responsibility to provide next raw event 
  //using AliRawReader::NextEvent().

  if(!gMinuit) 
    gMinuit = new TMinuit(100);

}

//-----------------------------------------------------------------------------
AliPHOSRawDecoderv1::~AliPHOSRawDecoderv1()
{
  //Destructor.
}

//-----------------------------------------------------------------------------
AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(const AliPHOSRawDecoderv1 &phosDecoder ):
  AliPHOSRawDecoder(phosDecoder)
{
  //Copy constructor.
}

//-----------------------------------------------------------------------------
AliPHOSRawDecoderv1& AliPHOSRawDecoderv1::operator = (const AliPHOSRawDecoderv1 &phosDecode)
{
  //Assignment operator.

  //  if(this != &phosDecode) {
  //  }

  return *this;
}

//-----------------------------------------------------------------------------
Bool_t AliPHOSRawDecoderv1::NextDigit()
{
  //Extract an energy deposited in the crystal,
  //crystal' position (module,column,row),
  //time and gain (high or low).
  //First collects sample, then evaluates it and if it has
  //reasonable shape, fits it with Gamma2 function and extracts 
  //energy and time.
  
  AliCaloRawStream* in = fCaloStream;
  
  Int_t    iBin     = 0;
  Int_t    tLength  = 0;
  fEnergy = -111;
  Float_t pedMean = 0;
  Int_t   nPed = 0;
  Float_t baseLine = 1.0;
  const Float_t nPreSamples = 10;
  
  while ( in->Next() ) { 
    
    if(!tLength) {
      tLength = in->GetTimeLength();
      if(tLength!=fSamples->GetSize()) {
	delete fSamples ;
	fSamples = new TArrayI(tLength);
      }
      else{
	for(Int_t i=0; i<fSamples->GetSize(); i++){
	  fSamples->AddAt(0,i) ;
	}
      }
    }
    
    // Fit the full sample
    if(in->IsNewHWAddress() && iBin>0) {
      
      Double_t pedestal =0. ;
      if(fPedSubtract){ 
	if (nPed > 0)
	  pedestal = (Double_t)(pedMean/nPed); 
	else
	  return kFALSE;
      }
      
      //calculate energy
      //first estimate if this sample looks like gamma2 function
      Double_t aMean=0. ;
      Double_t aRMS=0. ;
      Int_t tStart = 0 ;
      Int_t cnts=0 ;
      for(Int_t i=0; i<fSamples->GetSize(); i++){
	if(fSamples->At(i)>0){
	  Double_t de=fSamples->At(i)-pedestal ;
	  aMean+=de ;
	  aRMS+=de*de ;
	  cnts++;
	  if(de>2 && tStart==0)
	    tStart=i ;
	  if(fSamples->At(i)>fEnergy)
	    fEnergy=fSamples->At(i) ;
	}
      }
      if(cnts>0){
	aMean/=cnts; 
	aRMS=aRMS/cnts-aMean*aMean;
      }
      
      if(fPedSubtract){ 
	fEnergy-=pedestal ;
      }
      
      //IF sample has reasonable mean and RMS, try to fit it with gamma2
      if(fEnergy>2.&& cnts >20 && aMean>0. && aRMS>2.){ //more or less reasonable sample
	
	gMinuit->mncler();                     // Reset Minuit's list of paramters
	gMinuit->SetPrintLevel(-1) ;           // No Printout
	gMinuit->SetFCN(AliPHOSRawDecoderv1::UnfoldingChiSquare) ;  
	// To set the address of the minimization function 
	
	gMinuit->SetObjectFit((TObject*)fSamples) ;         // To tranfer pointer to UnfoldingChiSquare
	Int_t ierflg ;
	gMinuit->mnparm(0, "p",  pedestal, 0.1, 0, 0, ierflg) ;
	if(ierflg != 0){ 
	  //	  Warning("NextDigit", "Uunable to set initial value for fit procedure : ped = %f\n", pedestal ) ;
	  fEnergy=0. ;
	  fTime=-999. ;
	  return kTRUE ; //will scan further
	}
	gMinuit->mnparm(1, "t0",  1.*tStart, 0.1, 0, 0, ierflg) ;
	if(ierflg != 0){
	  //	  Warning("NextDigit", "Unable to set initial value for fit procedure : t0\n" ) ;
	  fEnergy=0. ;
	  fTime=-999. ;
	  return kTRUE ; //will scan further
	}
	gMinuit->mnparm(2, "Energy", fEnergy*0.018 , 0.001*fEnergy, 0, 0, ierflg) ;
	if(ierflg != 0){
	  //	  Warning("NextDigit", "Unable to set initial value for fit procedure : E=%f\n", fEnergy*0.018) ;
	  fEnergy=0. ;
	  fTime=-999. ;
	  return kTRUE ; //will scan further
	}
	gMinuit->mnparm(3, "Slope", 0.09 , 0.001, 0.001, 1., ierflg) ;
	if(ierflg != 0){
	  //	  Warning("NextDigit", "Unable to set initial value for fit procedure : Slope\n") ;
	  fEnergy=0. ;
	  fTime=-999. ;
	  return kTRUE ; //will scan further
	}
	
	Double_t p0 = 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(100);
	gMinuit->mnexcm("SET NOW", &p2 , 0, ierflg) ;  // No Warnings
	
	gMinuit->mnexcm("MIGRAD", &p0, 0, ierflg) ;    // minimize 
	
	Double_t err ;
	Double_t p,t0,efit,slope ;
	gMinuit->GetParameter(0,p, err) ;    
	gMinuit->GetParameter(1,t0, err) ;    
	gMinuit->GetParameter(2,efit, err) ;    
	gMinuit->GetParameter(3,slope, err) ;    
	
	efit=efit*4.*TMath::Exp(-2.)/slope/slope ; //slope can not be zero - par limits
	
	Double_t fmin,fedm,errdef ;
	Int_t npari,nparx,istat;
	gMinuit->mnstat(fmin,fedm,errdef,npari,nparx,istat) ;
	
	if(fmin < cnts*(efit/10.) ){ //Chi^2 of a good sample
	  if(efit<1050.&& efit>0.){
	    fEnergy=efit ;
	    fTime=t0 ;
	  }
	}
	else{
	  fEnergy=0 ; //bad sample
	  fTime=-999.;
	}
	if(fLowGainFlag)
	  fEnergy *= fPulseGenerator->GetRawFormatHighLowGainFactor(); // *16 
	
	if (fEnergy < baseLine) fEnergy = 0;
      }
      else{ //bad sample
	fEnergy=0. ;
	fTime=-999. ;
      }
      
      return kTRUE;
    }
    
    fLowGainFlag = in->IsLowGain();
    fTime = fPulseGenerator->GetRawFormatTimeTrigger() * in->GetTime();
    fModule = in->GetModule()+1;
    fRow    = in->GetRow()   +1;
    fColumn = in->GetColumn()+1;
    
    
    // Fill array with samples
    iBin++;                                                             
    if(tLength-iBin < nPreSamples) {
      pedMean += in->GetSignal();
      nPed++;
    }
    fSamples->AddAt(in->GetSignal(),tLength-iBin);
    
  } // in.Next()
  
  return kFALSE;
}
//_____________________________________________________________________________
void AliPHOSRawDecoderv1::UnfoldingChiSquare(Int_t & /*nPar*/, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag)
{
  // Calculates the Chi square for the samples minimization
  // Number of parameters, Gradient, Chi squared, parameters, what to do

  TArrayI * samples = (TArrayI*)gMinuit->GetObjectFit() ;

  fret = 0. ;     
  if(iflag == 2)
    for(Int_t iparam = 0 ; iparam < 4 ; iparam++)    
      Grad[iparam] = 0 ; // Will evaluate gradient
  
  Int_t nSamples=samples->GetSize() ;
  Double_t p =x[0] ;
  Double_t t0=x[1] ;
  Double_t en=x[2] ;
  Double_t a =x[3] ;
  
  for(Int_t i = 0 ; i < nSamples ; i++) {
    if(samples->At(i)==0)
      continue ;
    Double_t dt=i*1.-t0 ;
    Double_t diff=samples->At(i)-Gamma2(dt,p,en,a) ;
    Double_t w=1. ; //TMath::Ceil(TMath::Abs(samples->At(i)-ped)/10.) ;
    //    if(w==0)w=1. ;
    diff/=w ;
    if(iflag == 2){  // calculate gradient
      Grad[0] += -2.*diff/w ; //derivative over pedestal
      if(dt>=0.){
	Grad[1] += -2.*en*diff*(a*dt-2.*dt)*dt*TMath::Exp(-a*dt)/w ; //derivative over t0
	Grad[2] += -2.*diff*dt*dt*TMath::Exp(-a*dt)/w ;
	Grad[3] +=  2.*en*diff*dt*dt*dt*TMath::Exp(-a*dt)/w ;
      }
    }
    fret += diff*diff ;
  }
  /*
  if(nSamples){
    fret/=nSamples ;
    if(iflag == 2){
      for(Int_t iparam = 0 ; iparam < 4 ; iparam++)    
	Grad[iparam] /= nSamples ;
    }
  }
  */
  
  
}
//-----------------------------------------------------------------------------
Double_t AliPHOSRawDecoderv1::Gamma2(Double_t dt,Double_t p,Double_t en,Double_t a){
  //Function for fitting samples
  //parameters:
  //p-pedestal
  //en-amplutude
  //a-decay time

  if(dt<0.)
    return p ; //pedestal
  else
    return p+en*dt*dt*TMath::Exp(-dt*a) ;
}
Commit	Line	Data
77ea1c6f	1	/**************************************************************************
	2	* Copyright(c) 2007, 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	/* $Id$ */
	17
	18	// This class decodes the stream of ALTRO samples to extract
	19	// the PHOS "digits" of current event. Uses fitting procedure
	20	// to separate reasonable samples
	21	//
	22	// Typical use case:
	23	// AliRawReader* rf = new AliRawReaderDate("2006run2211.raw");
	24	// AliPHOSRawDecoder dc(rf);
	25	// while (rf->NextEvent()) {
	26	// dc.SetOldRCUFormat(kTRUE);
	27	// dc.SubtractPedestals(kTRUE);
	28	// while ( dc.NextDigit() ) {
	29	// Int_t module = dc.GetModule();
	30	// Int_t column = dc.GetColumn();
	31	// Int_t row = dc.GetRow();
	32	// Double_t amplitude = dc.GetEnergy();
	33	// Double_t time = dc.GetTime();
	34	// Bool_t IsLowGain = dc.IsLowGain();
	35	// ..........
	36	// }
	37	// }
	38
	39	// Author: Dmitri Peressounko
	40
	41	// --- ROOT system ---
	42	#include "TMath.h"
	43	#include "TMinuit.h"
	44
	45	// --- AliRoot header files ---
	46	#include "AliPHOSRawDecoderv1.h"
	47	#include "AliPHOSPulseGenerator.h"
	48
	49
	50	ClassImp(AliPHOSRawDecoderv1)
	51
	52	//-----------------------------------------------------------------------------
	53	AliPHOSRawDecoderv1::AliPHOSRawDecoderv1():AliPHOSRawDecoder()
	54	{
	55	//Default constructor.
	56	}
	57
	58	//-----------------------------------------------------------------------------
	59	AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(AliRawReader* rawReader, AliAltroMapping **mapping):
	60	AliPHOSRawDecoder(rawReader,mapping)
	61	{
	62	//Construct a decoder object.
	63	//Is is user responsibility to provide next raw event
	64	//using AliRawReader::NextEvent().
65
66	if(!gMinuit)
67	gMinuit = new TMinuit(100);
68
69	}
70
71	//-----------------------------------------------------------------------------
72	AliPHOSRawDecoderv1::~AliPHOSRawDecoderv1()
73	{
74	//Destructor.
75	}
76
77	//-----------------------------------------------------------------------------
78	AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(const AliPHOSRawDecoderv1 &phosDecoder ):
79	AliPHOSRawDecoder(phosDecoder)
80	{
81	//Copy constructor.
82	}
83
84	//-----------------------------------------------------------------------------
85	AliPHOSRawDecoderv1& AliPHOSRawDecoderv1::operator = (const AliPHOSRawDecoderv1 &phosDecode)
86	{
87	//Assignment operator.
88
89	// if(this != &phosDecode) {
90	// }
91
92	return *this;
93	}
94
95	//-----------------------------------------------------------------------------
96	Bool_t AliPHOSRawDecoderv1::NextDigit()
97	{
98	//Extract an energy deposited in the crystal,
99	//crystal' position (module,column,row),
100	//time and gain (high or low).
101	//First collects sample, then evaluates it and if it has
102	//reasonable shape, fits it with Gamma2 function and extracts
103	//energy and time.
104
105	AliCaloRawStream* in = fCaloStream;
106
107	Int_t iBin = 0;
108	Int_t tLength = 0;
109	fEnergy = -111;
110	Float_t pedMean = 0;
111	Int_t nPed = 0;
112	Float_t baseLine = 1.0;
113	const Float_t nPreSamples = 10;
114
115	while ( in->Next() ) {
116
117	if(!tLength) {
118	tLength = in->GetTimeLength();
119	if(tLength!=fSamples->GetSize()) {
120	delete fSamples ;
121	fSamples = new TArrayI(tLength);
122	}
123	else{
124	for(Int_t i=0; i<fSamples->GetSize(); i++){
125	fSamples->AddAt(0,i) ;
126	}
127	}
128	}
129
130	// Fit the full sample
131	if(in->IsNewHWAddress() && iBin>0) {
132
133	Double_t pedestal =0. ;
134	if(fPedSubtract){
135	if (nPed > 0)
136	pedestal = (Double_t)(pedMean/nPed);
137	else
138	return kFALSE;
139	}
140
141	//calculate energy
142	//first estimate if this sample looks like gamma2 function
143	Double_t aMean=0. ;
144	Double_t aRMS=0. ;
145	Int_t tStart = 0 ;
146	Int_t cnts=0 ;
147	for(Int_t i=0; i<fSamples->GetSize(); i++){
148	if(fSamples->At(i)>0){
149	Double_t de=fSamples->At(i)-pedestal ;
150	aMean+=de ;
151	aRMS+=de*de ;
152	cnts++;
153	if(de>2 && tStart==0)
154	tStart=i ;
155	if(fSamples->At(i)>fEnergy)
156	fEnergy=fSamples->At(i) ;
157	}
158	}
159	if(cnts>0){
160	aMean/=cnts;
161	aRMS=aRMS/cnts-aMean*aMean;
162	}
163
164	if(fPedSubtract){
165	fEnergy-=pedestal ;
166	}
167
168	//IF sample has reasonable mean and RMS, try to fit it with gamma2
169	if(fEnergy>2.&& cnts >20 && aMean>0. && aRMS>2.){ //more or less reasonable sample
170
171	gMinuit->mncler(); // Reset Minuit's list of paramters
172	gMinuit->SetPrintLevel(-1) ; // No Printout
173	gMinuit->SetFCN(AliPHOSRawDecoderv1::UnfoldingChiSquare) ;
174	// To set the address of the minimization function
175
176	gMinuit->SetObjectFit((TObject*)fSamples) ; // To tranfer pointer to UnfoldingChiSquare
177	Int_t ierflg ;
178	gMinuit->mnparm(0, "p", pedestal, 0.1, 0, 0, ierflg) ;
179	if(ierflg != 0){
180	// Warning("NextDigit", "Uunable to set initial value for fit procedure : ped = %f\n", pedestal ) ;
181	fEnergy=0. ;
182	fTime=-999. ;
183	return kTRUE ; //will scan further
184	}
185	gMinuit->mnparm(1, "t0", 1.*tStart, 0.1, 0, 0, ierflg) ;
186	if(ierflg != 0){
187	// Warning("NextDigit", "Unable to set initial value for fit procedure : t0\n" ) ;
188	fEnergy=0. ;
189	fTime=-999. ;
190	return kTRUE ; //will scan further
191	}
192	gMinuit->mnparm(2, "Energy", fEnergy0.018 , 0.001fEnergy, 0, 0, ierflg) ;
193	if(ierflg != 0){
194	// Warning("NextDigit", "Unable to set initial value for fit procedure : E=%f\n", fEnergy*0.018) ;
195	fEnergy=0. ;
196	fTime=-999. ;
197	return kTRUE ; //will scan further
198	}
199	gMinuit->mnparm(3, "Slope", 0.09 , 0.001, 0.001, 1., ierflg) ;
200	if(ierflg != 0){
201	// Warning("NextDigit", "Unable to set initial value for fit procedure : Slope\n") ;
202	fEnergy=0. ;
203	fTime=-999. ;
204	return kTRUE ; //will scan further
205	}
206
207	Double_t p0 = 1. ; // "Tolerance" Evaluation stops when EDM = 0.0001*p0 ; The number of function call slightly
208	// depends on it.
209	Double_t p1 = 1.0 ;
210	Double_t p2 = 0.0 ;
211	gMinuit->mnexcm("SET STR", &p2, 0, ierflg) ; // force TMinuit to reduce function calls
212	gMinuit->mnexcm("SET GRA", &p1, 1, ierflg) ; // force TMinuit to use my gradient
213	// gMinuit->SetMaxIterations(100);
214	gMinuit->mnexcm("SET NOW", &p2 , 0, ierflg) ; // No Warnings
215
216	gMinuit->mnexcm("MIGRAD", &p0, 0, ierflg) ; // minimize
217
218	Double_t err ;
219	Double_t p,t0,efit,slope ;
220	gMinuit->GetParameter(0,p, err) ;
221	gMinuit->GetParameter(1,t0, err) ;
222	gMinuit->GetParameter(2,efit, err) ;
223	gMinuit->GetParameter(3,slope, err) ;
224
225	efit=efit4.TMath::Exp(-2.)/slope/slope ; //slope can not be zero - par limits
226
227	Double_t fmin,fedm,errdef ;
228	Int_t npari,nparx,istat;
229	gMinuit->mnstat(fmin,fedm,errdef,npari,nparx,istat) ;
230
231	if(fmin < cnts*(efit/10.) ){ //Chi^2 of a good sample
232	if(efit<1050.&& efit>0.){
233	fEnergy=efit ;
234	fTime=t0 ;
235	}
236	}
237	else{
238	fEnergy=0 ; //bad sample
239	fTime=-999.;
240	}
241	if(fLowGainFlag)
242	fEnergy = fPulseGenerator->GetRawFormatHighLowGainFactor(); // 16
243
244	if (fEnergy < baseLine) fEnergy = 0;
245	}
246	else{ //bad sample
247	fEnergy=0. ;
248	fTime=-999. ;
249	}
250
251	return kTRUE;
252	}
253
254	fLowGainFlag = in->IsLowGain();
255	fTime = fPulseGenerator->GetRawFormatTimeTrigger() * in->GetTime();
256	fModule = in->GetModule()+1;
257	fRow = in->GetRow() +1;
258	fColumn = in->GetColumn()+1;
259
260
261	// Fill array with samples
262	iBin++;
263	if(tLength-iBin < nPreSamples) {
264	pedMean += in->GetSignal();
265	nPed++;
266	}
267	fSamples->AddAt(in->GetSignal(),tLength-iBin);
268
269	} // in.Next()
270
271	return kFALSE;
272	}
273	//_____________________________________________________________________________
274	void AliPHOSRawDecoderv1::UnfoldingChiSquare(Int_t & /nPar/, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag)
275	{
276	// Calculates the Chi square for the samples minimization
277	// Number of parameters, Gradient, Chi squared, parameters, what to do
278
279	TArrayI * samples = (TArrayI*)gMinuit->GetObjectFit() ;
280
281	fret = 0. ;
282	if(iflag == 2)
283	for(Int_t iparam = 0 ; iparam < 4 ; iparam++)
284	Grad[iparam] = 0 ; // Will evaluate gradient
285
286	Int_t nSamples=samples->GetSize() ;
287	Double_t p =x[0] ;
288	Double_t t0=x[1] ;
289	Double_t en=x[2] ;
290	Double_t a =x[3] ;
291
292	for(Int_t i = 0 ; i < nSamples ; i++) {
293	if(samples->At(i)==0)
294	continue ;
295	Double_t dt=i*1.-t0 ;
296	Double_t diff=samples->At(i)-Gamma2(dt,p,en,a) ;
297	Double_t w=1. ; //TMath::Ceil(TMath::Abs(samples->At(i)-ped)/10.) ;
298	// if(w==0)w=1. ;
299	diff/=w ;
300	if(iflag == 2){ // calculate gradient
301	Grad[0] += -2.*diff/w ; //derivative over pedestal
302	if(dt>=0.){
303	Grad[1] += -2.endiff(adt-2.dt)dtTMath::Exp(-adt)/w ; //derivative over t0
304	Grad[2] += -2.diffdtdtTMath::Exp(-a*dt)/w ;
305	Grad[3] += 2.endiffdtdtdtTMath::Exp(-a*dt)/w ;
306	}
307	}
308	fret += diff*diff ;
309	}
310	/*
311	if(nSamples){
312	fret/=nSamples ;
313	if(iflag == 2){
314	for(Int_t iparam = 0 ; iparam < 4 ; iparam++)
315	Grad[iparam] /= nSamples ;
316	}
317	}
318	*/
319
320
321	}
322	//-----------------------------------------------------------------------------
323	Double_t AliPHOSRawDecoderv1::Gamma2(Double_t dt,Double_t p,Double_t en,Double_t a){
324	//Function for fitting samples
325	//parameters:
326	//p-pedestal
327	//en-amplutude
328	//a-decay time
329
330	if(dt<0.)
331	return p ; //pedestal
332	else
333	return p+endtdtTMath::Exp(-dta) ;
334	}
335