1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
19 //-----------------------------------------------------------------------------
23 // Origin: Marian Ivanov, Uni. of Bratislava, ivanov@fmph.uniba.sk
25 // Declaration of class AliTPCRF1D
27 //-----------------------------------------------------------------------------
32 #include "AliTPCRF1D.h"
34 #include <Riostream.h>
40 extern TStyle * gStyle;
42 Int_t AliTPCRF1D::fgNRF=100; //default number of interpolation points
43 Float_t AliTPCRF1D::fgRFDSTEP=0.01; //default step in cm
45 static Double_t funGauss(Double_t *x, Double_t * par)
47 //Gauss function -needde by the generic function object
48 return TMath::Exp(-(x[0]*x[0])/(2*par[0]*par[0]));
51 static Double_t funCosh(Double_t *x, Double_t * par)
53 //Cosh function -needde by the generic function object
54 return 1/TMath::CosH(3.14159*x[0]/(2*par[0]));
57 static Double_t funGati(Double_t *x, Double_t * par)
59 //Gati function -needde by the generic function object
61 Float_t k3R=TMath::Sqrt(k3);
62 Float_t k2=(TMath::Pi()/2)*(1-k3R/2.);
63 Float_t k1=k2*k3R/(4*TMath::ATan(k3R));
64 Float_t l=x[0]/par[0];
65 Float_t tan2=TMath::TanH(k2*l);
67 Float_t res = k1*(1-tan2)/(1+k3*tan2);
71 ///////////////////////////////////////////////////////////////////////////
72 ///////////////////////////////////////////////////////////////////////////
77 AliTPCRF1D::AliTPCRF1D(Bool_t direct,Int_t np,Float_t step)
79 //default constructor for response function object
83 fcharge = new Float_t[fNRF];
84 if (step>0) fDSTEPM1=1./step;
85 else fDSTEPM1 = 1./fgRFDSTEP;
94 AliTPCRF1D::AliTPCRF1D(const AliTPCRF1D &prf)
97 memcpy(this, &prf, sizeof(prf));
98 fcharge = new Float_t[fNRF];
99 memcpy(fcharge,prf.fcharge, fNRF);
100 fGRF = new TF1(*(prf.fGRF));
103 AliTPCRF1D & AliTPCRF1D::operator = (const AliTPCRF1D &prf)
106 if (fcharge) delete fcharge;
107 if (fGRF) delete fGRF;
108 memcpy(this, &prf, sizeof(prf));
109 fcharge = new Float_t[fNRF];
110 memcpy(fcharge,prf.fcharge, fNRF);
111 fGRF = new TF1(*(prf.fGRF));
117 AliTPCRF1D::~AliTPCRF1D()
120 if (fcharge!=0) delete [] fcharge;
121 if (fGRF !=0 ) fGRF->Delete();
124 Float_t AliTPCRF1D::GetRF(Float_t xin)
126 //function which return response
127 //for the charge in distance xin
128 //return linear aproximation of RF
129 Float_t x = TMath::Abs((xin-fOffset)*fDSTEPM1)+fNRF/2;
134 res = fcharge[i1]*(Float_t(i1+1)-x)+fcharge[i1+1]*(x-Float_t(i1));
138 Float_t AliTPCRF1D::GetGRF(Float_t xin)
140 //function which returnoriginal charge distribution
141 //this function is just normalised for fKnorm
143 return fkNorm*fGRF->Eval(xin)/fInteg;
149 void AliTPCRF1D::SetParam( TF1 * GRF,Float_t padwidth,
150 Float_t kNorm, Float_t sigma)
152 //adjust parameters of the original charge distribution
153 //and pad size parameters
154 fpadWidth = padwidth;
157 if (sigma==0) sigma= fpadWidth/TMath::Sqrt(12.);
159 fDSTEPM1 = 10/TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
160 sprintf(fType,"User");
165 void AliTPCRF1D::SetGauss(Float_t sigma, Float_t padWidth,
169 // set parameters for Gauss generic charge distribution
171 fpadWidth = padWidth;
173 if (fGRF !=0 ) fGRF->Delete();
174 fGRF = new TF1("fun",funGauss,-5,5,1);
177 fGRF->SetParameters(funParam);
178 fDSTEPM1 = 10./TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
179 //by default I set the step as one tenth of sigma
180 sprintf(fType,"Gauss");
183 void AliTPCRF1D::SetCosh(Float_t sigma, Float_t padWidth,
187 // set parameters for Cosh generic charge distribution
189 fpadWidth = padWidth;
191 if (fGRF !=0 ) fGRF->Delete();
192 fGRF = new TF1("fun", funCosh, -5.,5.,2);
194 fGRF->SetParameters(funParam);
196 fDSTEPM1 = 10./TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
197 //by default I set the step as one tenth of sigma
198 sprintf(fType,"Cosh");
201 void AliTPCRF1D::SetGati(Float_t K3, Float_t padDistance, Float_t padWidth,
205 // set parameters for Gati generic charge distribution
207 fpadWidth = padWidth;
209 if (fGRF !=0 ) fGRF->Delete();
210 fGRF = new TF1("fun", funGati, -5.,5.,2);
211 funParam[0]=padDistance;
213 fGRF->SetParameters(funParam);
214 forigsigma=padDistance;
215 fDSTEPM1 = 10./TMath::Sqrt(padDistance*padDistance+fpadWidth*fpadWidth/12);
216 //by default I set the step as one tenth of sigma
217 sprintf(fType,"Gati");
220 void AliTPCRF1D::DrawRF(Float_t x1,Float_t x2,Int_t N)
223 //Draw prf in selected region <x1,x2> with nuber of diviision = n
226 TCanvas * c1 = new TCanvas("canRF","Pad response function",700,900);
228 TPad * pad1 = new TPad("pad1RF","",0.05,0.55,0.95,0.95,21);
230 TPad * pad2 = new TPad("pad2RF","",0.05,0.05,0.95,0.45,21);
233 sprintf(s,"RF response function for %1.2f cm pad width",
236 TH1F * hRFo = new TH1F("hRFo","Original charge distribution",N+1,x1,x2);
238 gStyle->SetOptFit(1);
239 gStyle->SetOptStat(0);
240 TH1F * hRFc = new TH1F("hRFc",s,N+1,x1,x2);
245 for (Float_t i = 0;i<N+1;i++)
247 x+=(x2-x1)/Float_t(N);
259 void AliTPCRF1D::Update()
262 //update fields with interpolated values for
265 //at the begining initialize to 0
266 for (Int_t i =0; i<fNRF;i++) fcharge[i] = 0;
267 if ( fGRF == 0 ) return;
268 fInteg = fGRF->Integral(-5*forigsigma,5*forigsigma,funParam,0.00001);
269 if ( fInteg == 0 ) fInteg = 1;
270 if (fDirect==kFALSE){
271 //integrate charge over pad for different distance of pad
272 for (Int_t i =0; i<fNRF;i++)
273 { //x in cm fpadWidth in cm
274 Float_t x = (Float_t)(i-fNRF/2)/fDSTEPM1;
275 Float_t x1=TMath::Max(x-fpadWidth/2,-5*forigsigma);
276 Float_t x2=TMath::Min(x+fpadWidth/2,5*forigsigma);
278 fkNorm*fGRF->Integral(x1,x2,funParam,0.0001)/fInteg;
282 for (Int_t i =0; i<fNRF;i++)
283 { //x in cm fpadWidth in cm
284 Float_t x = (Float_t)(i-fNRF/2)/fDSTEPM1;
285 fcharge[i] = fkNorm*fGRF->Eval(x);
291 for (Float_t x =-fNRF/fDSTEPM1; x<fNRF/fDSTEPM1;x+=1/fDSTEPM1)
292 { //x in cm fpadWidth in cm
293 Float_t weight = GetRF(x+fOffset);
300 fSigma = TMath::Sqrt(fSigma/sum-mean*mean);
305 void AliTPCRF1D::Streamer(TBuffer &R__b)
307 // Stream an object of class AliTPCRF1D.
308 if (R__b.IsReading()) {
309 AliTPCRF1D::Class()->ReadBuffer(R__b, this);
312 if (strncmp(fType,"Gauss",3)==0) {delete fGRF; fGRF = new TF1("fun",funGauss,-5.,5.,4);}
313 if (strncmp(fType,"Cosh",3)==0) {delete fGRF; fGRF = new TF1("fun",funCosh,-5.,5.,4);}
314 if (strncmp(fType,"Gati",3)==0) {delete fGRF; fGRF = new TF1("fun",funGati,-5.,5.,4);}
315 if (fGRF) fGRF->SetParameters(funParam);
318 AliTPCRF1D::Class()->WriteBuffer(R__b, this);