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Parameters for track finding in AliITStrackerSA added to AliITSRecoParam (F. PRino)
[u/mrichter/AliRoot.git] / PHOS / AliPHOSRawDecoderv1.cxx
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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 ---
11f2ec15 42#include "TList.h"
77ea1c6f 43#include "TMath.h"
44#include "TMinuit.h"
45
11f2ec15 46#include "TCanvas.h"
47#include "TH1.h"
48#include "TH2.h"
49#include "TF1.h"
50#include "TROOT.h"
51
77ea1c6f 52// --- AliRoot header files ---
11f2ec15 53//#include "AliLog.h"
77ea1c6f 54#include "AliPHOSRawDecoderv1.h"
55#include "AliPHOSPulseGenerator.h"
56
57
58ClassImp(AliPHOSRawDecoderv1)
59
60//-----------------------------------------------------------------------------
11f2ec15 61 AliPHOSRawDecoderv1::AliPHOSRawDecoderv1():AliPHOSRawDecoder(),
62fSampleParamsLow(0x0),fSampleParamsHigh(0x0),fToFit(0x0)
77ea1c6f 63{
64 //Default constructor.
65}
66
67//-----------------------------------------------------------------------------
68AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(AliRawReader* rawReader, AliAltroMapping **mapping):
11f2ec15 69 AliPHOSRawDecoder(rawReader,mapping),
70 fSampleParamsLow(0x0),fSampleParamsHigh(0x0),fToFit(0x0)
77ea1c6f 71{
72 //Construct a decoder object.
73 //Is is user responsibility to provide next raw event
74 //using AliRawReader::NextEvent().
75
76 if(!gMinuit)
77 gMinuit = new TMinuit(100);
70d93620 78 fSampleParamsHigh =new TArrayD(7) ;
79 fSampleParamsHigh->AddAt(2.174,0) ;
80 fSampleParamsHigh->AddAt(0.106,1) ;
81 fSampleParamsHigh->AddAt(0.173,2) ;
82 fSampleParamsHigh->AddAt(0.06106,3) ;
83 //last two parameters are pedestal and overflow
84 fSampleParamsLow=new TArrayD(7) ;
85 fSampleParamsLow->AddAt(2.456,0) ;
86 fSampleParamsLow->AddAt(0.137,1) ;
87 fSampleParamsLow->AddAt(2.276,2) ;
88 fSampleParamsLow->AddAt(0.08246,3) ;
11f2ec15 89 fToFit = new TList() ;
77ea1c6f 90}
91
92//-----------------------------------------------------------------------------
93AliPHOSRawDecoderv1::~AliPHOSRawDecoderv1()
94{
95 //Destructor.
11f2ec15 96 if(fSampleParamsLow){
97 delete fSampleParamsLow ;
98 fSampleParamsLow=0 ;
99 }
100 if(fSampleParamsHigh){
101 delete fSampleParamsHigh ;
102 fSampleParamsHigh=0;
103 }
104 if(fToFit){
105 delete fToFit ;
106 fToFit=0 ;
107 }
77ea1c6f 108}
109
110//-----------------------------------------------------------------------------
111AliPHOSRawDecoderv1::AliPHOSRawDecoderv1(const AliPHOSRawDecoderv1 &phosDecoder ):
11f2ec15 112 AliPHOSRawDecoder(phosDecoder),
113 fSampleParamsLow(0x0),fSampleParamsHigh(0x0),fToFit(0x0)
77ea1c6f 114{
115 //Copy constructor.
11f2ec15 116 fToFit = new TList() ;
117 fSampleParamsLow =new TArrayD(*(phosDecoder.fSampleParamsLow)) ;
118 fSampleParamsHigh=new TArrayD(*(phosDecoder.fSampleParamsHigh)) ;
77ea1c6f 119}
120
121//-----------------------------------------------------------------------------
11f2ec15 122AliPHOSRawDecoderv1& AliPHOSRawDecoderv1::operator = (const AliPHOSRawDecoderv1 &phosDecoder)
77ea1c6f 123{
124 //Assignment operator.
125
11f2ec15 126 // if(this != &phosDecoder) {
77ea1c6f 127 // }
11f2ec15 128 fToFit = new TList() ;
129 if(fSampleParamsLow){
130 fSampleParamsLow = phosDecoder.fSampleParamsLow ;
131 fSampleParamsHigh= phosDecoder.fSampleParamsHigh ;
132 }
133 else{
134 fSampleParamsLow =new TArrayD(*(phosDecoder.fSampleParamsLow)) ;
135 fSampleParamsHigh=new TArrayD(*(phosDecoder.fSampleParamsHigh)) ;
136 }
77ea1c6f 137 return *this;
138}
139
140//-----------------------------------------------------------------------------
141Bool_t AliPHOSRawDecoderv1::NextDigit()
142{
143 //Extract an energy deposited in the crystal,
144 //crystal' position (module,column,row),
145 //time and gain (high or low).
146 //First collects sample, then evaluates it and if it has
147 //reasonable shape, fits it with Gamma2 function and extracts
148 //energy and time.
11f2ec15 149
70d93620 150//Debug=====================
39569d36 151// TCanvas * c = 0; //(TCanvas*)gROOT->FindObjectAny("CSample") ;
70d93620 152// if(!c)
153// c = new TCanvas("CSample","CSample") ;
154//
39569d36 155// TH1D * h = 0 ; //(TH1D*)gROOT->FindObjectAny("hSample") ;
70d93620 156// if(!h)
157// h=new TH1D("hSample","",200,0.,200.) ;
158//
39569d36 159// TF1 * fff = 0 ; //(TF1*)gROOT->FindObjectAny("fff") ;
70d93620 160// if(!fff)
161// fff = new TF1("fff","[0]+[1]*((abs(x-[2]))^[3]*exp(-(x-[2])*[4])+[5]*(x-[2])*(x-[2])*exp(-(x-[2])*[6]))",0.,1000.) ;
162//End debug===========
77ea1c6f 163
164 AliCaloRawStream* in = fCaloStream;
165
70d93620 166 Int_t iBin = fSamples->GetSize() ;
77ea1c6f 167 Int_t tLength = 0;
168 fEnergy = -111;
169 Float_t pedMean = 0;
170 Int_t nPed = 0;
171 Float_t baseLine = 1.0;
172 const Float_t nPreSamples = 10;
70d93620 173 fQuality= 999. ;
174 const Float_t sampleMaxHG=102.332 ; //maximal height of HG sample with given parameterization
175 const Float_t sampleMaxLG=277.196 ; //maximal height of HG sample with given parameterization
39569d36 176 const Float_t maxEtoFit=5 ; //fit only samples above this energy, accept all samples (with good aRMS) below it
77ea1c6f 177
178 while ( in->Next() ) {
179
180 if(!tLength) {
181 tLength = in->GetTimeLength();
182 if(tLength!=fSamples->GetSize()) {
183 delete fSamples ;
70d93620 184 delete fTimes ;
77ea1c6f 185 fSamples = new TArrayI(tLength);
70d93620 186 fTimes = new TArrayI(tLength);
187 iBin= fSamples->GetSize() ;
77ea1c6f 188 }
189 else{
70d93620 190 fSamples->Reset() ;
77ea1c6f 191 }
192 }
193
194 // Fit the full sample
70d93620 195 if(in->IsNewHWAddress() && iBin != fSamples->GetSize()) {
39569d36 196
197 //First remember new sample
198 fNewLowGainFlag = in->IsLowGain();
199 fNewModule = in->GetModule()+1;
200 fNewRow = in->GetRow() +1;
201 fNewColumn = in->GetColumn()+1;
202 fNewAmp = in->GetSignal() ;
203 fNewTime=in->GetTime() ;
204 //new handle already collected
77ea1c6f 205 Double_t pedestal =0. ;
206 if(fPedSubtract){
207 if (nPed > 0)
208 pedestal = (Double_t)(pedMean/nPed);
209 else
210 return kFALSE;
211 }
70d93620 212
213 //calculate time and energy
214 Int_t maxBin=0 ;
215 Int_t maxAmp=0 ;
216 Double_t aMean=0. ;
217 Double_t aRMS=0. ;
39569d36 218 Double_t wts=0 ;
70d93620 219 Int_t tStart = 0 ;
70d93620 220 for(Int_t i=iBin; i<fSamples->GetSize(); i++){
221 if(fSamples->At(i)>0){
222 Double_t de=fSamples->At(i)-pedestal ;
39569d36 223 if(de>1.){
224 aMean+=de*i ;
225 aRMS+=de*i*i ;
226 wts+=de;
227 }
70d93620 228 if(de>2 && tStart==0)
229 tStart=i ;
230 if(maxAmp<fSamples->At(i)){
231 maxBin=i ;
232 maxAmp=fSamples->At(i) ;
233 }
234 }
235 }
39569d36 236 if(maxBin==fSamples->GetSize()-1){//bad "rising" sample
70d93620 237 fEnergy=0. ;
238 fTime=-999.;
239 fQuality= 999. ;
240 return kTRUE ;
241 }
242 fEnergy=Double_t(maxAmp)-pedestal ;
243 fOverflow =0 ; //look for plato on the top of sample
244 if(fEnergy>500 && //this is not fluctuation of soft sample
245 maxBin<fSamples->GetSize()-1 && fSamples->At(maxBin+1)==maxAmp){ //and there is a plato
246 fOverflow = kTRUE ;
77ea1c6f 247 }
70d93620 248
39569d36 249 if(wts>0){
250 aMean/=wts;
251 aRMS=aRMS/wts-aMean*aMean;
77ea1c6f 252 }
39569d36 253
254 //do not take too small energies
255 if(fEnergy < baseLine)
256 fEnergy = 0;
257
258 //do not test quality of too soft samples
259 if(fEnergy<maxEtoFit){
260 fTime=fTimes->At(tStart);
261 if(aRMS<2.) //sigle peak
262 fQuality=999. ;
263 else
264 fQuality= 0. ;
265 return kTRUE ;
266 }
267
77ea1c6f 268
70d93620 269//Debug:=====Draw sample
270//if(fEnergy>pedestal+10.){
39569d36 271//if(fLowGainFlag && fEnergy>2){
272// if(!c)
113139da 273// if(!fLowGainFlag && fRow==32 && fColumn==18){
274// TCanvas *c = new TCanvas("CSample","CSample") ;
70d93620 275// c->cd() ;
276// h->Draw() ;
277// c->Update() ;
39569d36 278// printf("fEnergy=%f, aRMS=%f \n",fEnergy,aRMS) ;
279//getchar() ;
70d93620 280//}
281//======================
282
77ea1c6f 283 //IF sample has reasonable mean and RMS, try to fit it with gamma2
77ea1c6f 284
285 gMinuit->mncler(); // Reset Minuit's list of paramters
286 gMinuit->SetPrintLevel(-1) ; // No Printout
287 gMinuit->SetFCN(AliPHOSRawDecoderv1::UnfoldingChiSquare) ;
288 // To set the address of the minimization function
11f2ec15 289
290 fToFit->Clear() ;
113139da 291 Double_t b,bmin,bmax ;
11f2ec15 292 if(fLowGainFlag){
293 fSampleParamsLow->AddAt(pedestal,4) ;
70d93620 294 if(fOverflow)
295 fSampleParamsLow->AddAt(double(maxAmp),5) ;
296 else
297 fSampleParamsLow->AddAt(double(1023),5) ;
298 fSampleParamsLow->AddAt(double(iBin),6) ;
11f2ec15 299 fToFit->AddFirst((TObject*)fSampleParamsLow) ;
113139da 300 b=fSampleParamsLow->At(2) ;
301 bmin=0.5 ;
302 bmax=10. ;
303 }
304 else{
11f2ec15 305 fSampleParamsHigh->AddAt(pedestal,4) ;
70d93620 306 if(fOverflow)
307 fSampleParamsHigh->AddAt(double(maxAmp),5) ;
308 else
309 fSampleParamsHigh->AddAt(double(1023),5);
310 fSampleParamsHigh->AddAt(double(iBin),6);
11f2ec15 311 fToFit->AddFirst((TObject*)fSampleParamsHigh) ;
113139da 312 b=fSampleParamsHigh->At(2) ;
313 bmin=0.05 ;
314 bmax=0.4 ;
11f2ec15 315 }
316 fToFit->AddLast((TObject*)fSamples) ;
70d93620 317 fToFit->AddLast((TObject*)fTimes) ;
11f2ec15 318
319 gMinuit->SetObjectFit((TObject*)fToFit) ; // To tranfer pointer to UnfoldingChiSquare
77ea1c6f 320 Int_t ierflg ;
113139da 321 gMinuit->mnparm(0, "t0", 1.*tStart, 0.01, 0, 0, ierflg) ;
77ea1c6f 322 if(ierflg != 0){
11f2ec15 323// AliWarning(Form("Unable to set initial value for fit procedure : t0=%e\n",1.*tStart) ) ;
77ea1c6f 324 fEnergy=0. ;
325 fTime=-999. ;
70d93620 326 fQuality=999 ;
77ea1c6f 327 return kTRUE ; //will scan further
328 }
70d93620 329 Double_t amp0;
330 if(fLowGainFlag)
331 amp0=fEnergy/sampleMaxLG;
332 else
333 amp0=fEnergy/sampleMaxHG;
11f2ec15 334
113139da 335 gMinuit->mnparm(1, "Energy", amp0 , 0.01*amp0, 0, 0, ierflg) ;
77ea1c6f 336 if(ierflg != 0){
11f2ec15 337// AliWarning(Form("Unable to set initial value for fit procedure : E=%e\n", amp0)) ;
77ea1c6f 338 fEnergy=0. ;
339 fTime=-999. ;
70d93620 340 fQuality=999 ;
77ea1c6f 341 return kTRUE ; //will scan further
342 }
113139da 343
344 gMinuit->mnparm(2, "p2", b, 0.01*b, bmin, bmax, ierflg) ;
345 if(ierflg != 0){
346// AliWarning(Form("Unable to set initial value for fit procedure : E=%e\n", amp0)) ;
347 fEnergy=0. ;
348 fTime=-999. ;
349 fQuality=999 ;
350 return kTRUE ; //will scan further
351 }
352
77ea1c6f 353
11f2ec15 354 Double_t p0 = 0.0001 ; // "Tolerance" Evaluation stops when EDM = 0.0001*p0 ; The number of function call slightly
77ea1c6f 355 // depends on it.
356 Double_t p1 = 1.0 ;
357 Double_t p2 = 0.0 ;
358 gMinuit->mnexcm("SET STR", &p2, 0, ierflg) ; // force TMinuit to reduce function calls
359 gMinuit->mnexcm("SET GRA", &p1, 1, ierflg) ; // force TMinuit to use my gradient
360 // gMinuit->SetMaxIterations(100);
361 gMinuit->mnexcm("SET NOW", &p2 , 0, ierflg) ; // No Warnings
362
363 gMinuit->mnexcm("MIGRAD", &p0, 0, ierflg) ; // minimize
70d93620 364
77ea1c6f 365
11f2ec15 366 Double_t err,t0err ;
367 Double_t t0,efit ;
368 gMinuit->GetParameter(0,t0, t0err) ;
369 gMinuit->GetParameter(1,efit, err) ;
11f2ec15 370
113139da 371 Double_t bfit, berr ;
372 gMinuit->GetParameter(2,bfit,berr) ;
373
70d93620 374 //Calculate total energy
113139da 375 //this isparameterization of depetendence of pulse height on parameter b
70d93620 376 if(fLowGainFlag)
113139da 377 efit*=99.54910 + 78.65038*bfit ;
70d93620 378 else
113139da 379 efit*=80.33109+128.6433*bfit ;
70d93620 380
381 if(efit<0. || efit > 10000.){
b20d9db0 382//leave energy as previously found max
383// fEnergy=0 ; //bad sample
70d93620 384 fTime=-999.;
385 fQuality=999 ;
386 return kTRUE;
387 }
388
389 //evaluate fit quality
390 Double_t fmin,fedm,errdef ;
391 Int_t npari,nparx,istat;
392 gMinuit->mnstat(fmin,fedm,errdef,npari,nparx,istat) ;
393 fQuality=fmin/(fSamples->GetSize()-iBin) ;
394 //compare quality with some parameterization
113139da 395 if(fLowGainFlag){
396 fQuality/=2.+0.002*fEnergy ;
397 }
398 else{
399 fQuality/=0.75+0.0025*fEnergy ;
400 }
70d93620 401
402//Debug================
113139da 403// Double_t n,alpha,beta ;
70d93620 404// if(fLowGainFlag){
405// n=fSampleParamsLow->At(0) ;
406// alpha=fSampleParamsLow->At(1) ;
70d93620 407// beta=fSampleParamsLow->At(3) ;
408// }
409// else{
410// n=fSampleParamsHigh->At(0) ;
411// alpha=fSampleParamsHigh->At(1) ;
70d93620 412// beta=fSampleParamsHigh->At(3) ;
413// }
414//
113139da 415// if( fQuality > 1 && fEnergy > 20. && !fOverflow){
416// if(!fLowGainFlag && fRow==32 && fColumn==18){
417// printf("Col=%d, row=%d, qual=%f, E=%f, t0=%f, b=%f\n",fColumn,fRow,fQuality,efit,t0,bfit) ;
418// TCanvas * c = new TCanvas("samp") ;
11f2ec15 419// c->cd() ;
420// h->Draw() ;
421// if(fLowGainFlag){
113139da 422// fff->SetParameters(pedestal,efit/sampleMaxLG,t0,n,alpha,bfit,beta) ;
11f2ec15 423// }
424// else{
113139da 425// fff->SetParameters(pedestal,efit/sampleMaxHG,t0,n,alpha,bfit,beta) ;
11f2ec15 426// }
113139da 427//// for(Int_t i=1;i<=h->GetNbinsX(); i++){
428// Double_t x=h->GetBinCenter(i) ;
429// h->SetBinContent(i,h->GetBinContent(i)-fff->Eval(x)) ;
430// }
431// h->SetMinimum(-15.) ;
432// h->SetMaximum(15.) ;
433// h->Draw() ;
11f2ec15 434// fff->Draw("same") ;
435// c->Update();
70d93620 436// getchar() ;
437// }
438//====================
11f2ec15 439
39569d36 440 fEnergy=efit ;
441 fTime=t0 ;
11f2ec15 442
77ea1c6f 443
444 return kTRUE;
445 }
446
447 fLowGainFlag = in->IsLowGain();
77ea1c6f 448 fModule = in->GetModule()+1;
449 fRow = in->GetRow() +1;
450 fColumn = in->GetColumn()+1;
39569d36 451
452 //add previouly taken if coincides
453 if(fLowGainFlag==fNewLowGainFlag && fModule==fNewModule &&
454 fRow==fNewRow && fColumn==fNewColumn){
455 iBin--;
456 if(fPedSubtract && fNewTime < nPreSamples) {
457 pedMean += in->GetSignal();
458 nPed++;
459 }
460 fSamples->AddAt(fNewAmp,iBin);
461 fTimes->AddAt(fNewTime,iBin);
462
463 //Mark that we already take it
464 fNewModule=-1 ;
465 }
77ea1c6f 466
77ea1c6f 467 // Fill array with samples
70d93620 468 iBin--;
469 if(fPedSubtract && (in->GetTime() < nPreSamples)) {
77ea1c6f 470 pedMean += in->GetSignal();
471 nPed++;
472 }
70d93620 473 fSamples->AddAt(in->GetSignal(),iBin);
474 fTimes->AddAt(in->GetTime(),iBin);
475
476//Debug==============
477// h->SetBinContent(iBin,in->GetSignal()) ;
77ea1c6f 478
479 } // in.Next()
480
481 return kFALSE;
482}
483//_____________________________________________________________________________
484void AliPHOSRawDecoderv1::UnfoldingChiSquare(Int_t & /*nPar*/, Double_t * Grad, Double_t & fret, Double_t * x, Int_t iflag)
485{
77ea1c6f 486 // Number of parameters, Gradient, Chi squared, parameters, what to do
487
11f2ec15 488 TList * toFit= (TList*)gMinuit->GetObjectFit() ;
489 TArrayD * params=(TArrayD*)toFit->At(0) ;
490 TArrayI * samples = (TArrayI*)toFit->At(1) ;
70d93620 491 TArrayI * times = (TArrayI*)toFit->At(2) ;
77ea1c6f 492
493 fret = 0. ;
494 if(iflag == 2)
113139da 495 for(Int_t iparam = 0 ; iparam < 3 ; iparam++)
77ea1c6f 496 Grad[iparam] = 0 ; // Will evaluate gradient
497
11f2ec15 498 Double_t t0=x[0] ;
499 Double_t en=x[1] ;
113139da 500 Double_t b=x[2] ;
70d93620 501 Double_t n=params->At(0) ;
11f2ec15 502 Double_t alpha=params->At(1) ;
11f2ec15 503 Double_t beta=params->At(3) ;
113139da 504 Double_t ped=params->At(4) ;
505
506 Double_t overflow=params->At(5) ;
70d93620 507 Int_t iBin = (Int_t) params->At(6) ;
508 Int_t nSamples=TMath::Min(iBin+70,samples->GetSize()) ; //Here we set number of points to fit (70)
77ea1c6f 509
113139da 510 Int_t tStep=times->At(iBin+1)-times->At(iBin) ;
511 Double_t ddt=TMath::Ceil(t0)-t0-tStep ;
512 Double_t exp1=TMath::Exp(-alpha*ddt) ;
513 Double_t exp2=TMath::Exp(-beta*ddt) ;
514 Double_t dexp1=TMath::Exp(-alpha*tStep) ;
515 Double_t dexp2=TMath::Exp(-beta*tStep) ;
516 for(Int_t i = iBin; i<nSamples ; i++) {
517 Double_t fsample = double(samples->At(i)) ;
518// if(fsample>=overflow)
519// continue ;
520 Double_t dt=double(times->At(i))-t0 ;
521 Double_t diff ;
522 if(dt<=0.){
523 diff=fsample - ped ;
524 fret += diff*diff ;
77ea1c6f 525 continue ;
113139da 526 }
527 exp1*=dexp1 ;
528 exp2*=dexp2 ;
529 Double_t dtn=TMath::Power(dt,n) ;
530 Double_t dtnE=dtn*exp1 ;
531 Double_t dt2E=dt*dt*exp2 ;
532 Double_t fit=ped+en*(dtnE + b*dt2E) ;
533 if(fit>=overflow){
534 diff=fsample-overflow ;
535 fret += diff*diff ;
536 //zero gradient here
537 }
538 else{
539 diff = fsample - fit ;
540 fret += diff*diff ;
541 if(iflag == 2){ // calculate gradient
542 Grad[0] += en*diff*(dtnE*(n/dt-alpha)+b*dt2E*(2./dt-beta)) ; //derivative over t0
543 Grad[1] -= diff*(dtnE+b*dt2E) ;
544 Grad[2] -= en*diff*dt2E ;
77ea1c6f 545 }
546 }
77ea1c6f 547 }
113139da 548 if(iflag == 2)
549 for(Int_t iparam = 0 ; iparam < 3 ; iparam++)
550 Grad[iparam] *= 2. ;
77ea1c6f 551}
552//-----------------------------------------------------------------------------
113139da 553Double_t AliPHOSRawDecoderv1::Gamma2(Double_t dt,Double_t en,Double_t b,TArrayD * params){ //Function for fitting samples
77ea1c6f 554 //parameters:
11f2ec15 555 //dt-time after start
77ea1c6f 556 //en-amplutude
11f2ec15 557 //function parameters
558
559 Double_t ped=params->At(4) ;
77ea1c6f 560 if(dt<0.)
11f2ec15 561 return ped ; //pedestal
77ea1c6f 562 else
113139da 563 return ped+en*(TMath::Power(dt,params->At(0))*TMath::Exp(-dt*params->At(1))+b*dt*dt*TMath::Exp(-dt*params->At(3))) ;
77ea1c6f 564}
565