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 **************************************************************************/
18 Revision 1.4.8.2 2000/04/10 08:53:09 kowal2
23 Revision 1.4 1999/09/29 09:24:34 fca
24 Introduction of the Copyright and cvs Log
28 //-----------------------------------------------------------------------------
32 // Origin: Marian Ivanov, Uni. of Bratislava, ivanov@fmph.uniba.sk
34 // Declaration of class AliTPCRF1D
36 //-----------------------------------------------------------------------------
39 #include "AliTPCRF1D.h"
47 extern TStyle * gStyle;
49 static Double_t funGauss(Double_t *x, Double_t * par)
51 //Gauss function -needde by the generic function object
52 return TMath::Exp(-(x[0]*x[0])/(2*par[0]*par[0]));
55 static Double_t funCosh(Double_t *x, Double_t * par)
57 //Cosh function -needde by the generic function object
58 return 1/TMath::CosH(3.14159*x[0]/(2*par[0]));
61 static Double_t funGati(Double_t *x, Double_t * par)
63 //Gati function -needde by the generic function object
65 Float_t K3R=TMath::Sqrt(K3);
66 Float_t K2=(TMath::Pi()/2)*(1-K3R/2.);
67 Float_t K1=K2*K3R/(4*TMath::ATan(K3R));
68 Float_t l=x[0]/par[0];
69 Float_t tan2=TMath::TanH(K2*l);
71 Float_t res = K1*(1-tan2)/(1+K3*tan2);
75 ///////////////////////////////////////////////////////////////////////////
76 ///////////////////////////////////////////////////////////////////////////
81 AliTPCRF1D::AliTPCRF1D(Bool_t direct,Int_t np,Float_t step)
83 //default constructor for response function object
86 fcharge = new Float_t[fNRF];
97 AliTPCRF1D::~AliTPCRF1D()
99 if (fcharge!=0) delete [] fcharge;
100 if (fGRF !=0 ) fGRF->Delete();
103 Float_t AliTPCRF1D::GetRF(Float_t xin)
105 //function which return response
106 //for the charge in distance xin
107 //return linear aproximation of RF
108 Float_t x = TMath::Abs((xin-fOffset)*fDSTEPM1)+fNRF/2;
113 res = fcharge[i1]*(Float_t(i1+1)-x)+fcharge[i1+1]*(x-Float_t(i1));
117 Float_t AliTPCRF1D::GetGRF(Float_t xin)
119 //function which returnoriginal charge distribution
120 //this function is just normalised for fKnorm
122 return fkNorm*fGRF->Eval(xin)/fInteg;
128 void AliTPCRF1D::SetParam( TF1 * GRF,Float_t padwidth,
129 Float_t kNorm, Float_t sigma)
131 //adjust parameters of the original charge distribution
132 //and pad size parameters
133 fpadWidth = padwidth;
136 if (sigma==0) sigma= fpadWidth/TMath::Sqrt(12.);
138 fDSTEPM1 = 10/TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
139 sprintf(fType,"User");
144 void AliTPCRF1D::SetGauss(Float_t sigma, Float_t padWidth,
148 // set parameters for Gauss generic charge distribution
150 fpadWidth = padWidth;
152 if (fGRF !=0 ) fGRF->Delete();
153 fGRF = new TF1("fun",funGauss,-5,5,2);
156 fGRF->SetParameters(funParam);
157 fDSTEPM1 = 10./TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
158 //by default I set the step as one tenth of sigma
159 sprintf(fType,"Gauss");
162 void AliTPCRF1D::SetCosh(Float_t sigma, Float_t padWidth,
166 // set parameters for Cosh generic charge distribution
168 fpadWidth = padWidth;
170 if (fGRF !=0 ) fGRF->Delete();
171 fGRF = new TF1("fun", funCosh, -5.,5.,2);
173 fGRF->SetParameters(funParam);
175 fDSTEPM1 = 10./TMath::Sqrt(sigma*sigma+fpadWidth*fpadWidth/12);
176 //by default I set the step as one tenth of sigma
177 sprintf(fType,"Cosh");
180 void AliTPCRF1D::SetGati(Float_t K3, Float_t padDistance, Float_t padWidth,
184 // set parameters for Gati generic charge distribution
186 fpadWidth = padWidth;
188 if (fGRF !=0 ) fGRF->Delete();
189 fGRF = new TF1("fun", funGati, -5.,5.,2);
190 funParam[0]=padDistance;
192 fGRF->SetParameters(funParam);
193 forigsigma=padDistance;
194 fDSTEPM1 = 10./TMath::Sqrt(padDistance*padDistance+fpadWidth*fpadWidth/12);
195 //by default I set the step as one tenth of sigma
196 sprintf(fType,"Gati");
199 void AliTPCRF1D::Draw(Float_t x1,Float_t x2,Int_t N)
202 //Draw prf in selected region <x1,x2> with nuber of diviision = n
205 TCanvas * c1 = new TCanvas("canRF","Pad response function",700,900);
207 TPad * pad1 = new TPad("pad1RF","",0.05,0.55,0.95,0.95,21);
209 TPad * pad2 = new TPad("pad2RF","",0.05,0.05,0.95,0.45,21);
212 sprintf(s,"RF response function for %1.2f cm pad width",
215 TH1F * hRFo = new TH1F("hRFo","Original charge distribution",N+1,x1,x2);
217 gStyle->SetOptFit(1);
218 gStyle->SetOptStat(0);
219 TH1F * hRFc = new TH1F("hRFc",s,N+1,x1,x2);
224 for (Float_t i = 0;i<N+1;i++)
226 x+=(x2-x1)/Float_t(N);
238 void AliTPCRF1D::Update()
241 //update fields with interpolated values for
244 //at the begining initialize to 0
245 for (Int_t i =0; i<fNRF;i++) fcharge[i] = 0;
246 if ( fGRF == 0 ) return;
247 fInteg = fGRF->Integral(-5*forigsigma,5*forigsigma,funParam,0.00001);
248 if ( fInteg == 0 ) fInteg = 1;
249 if (fDirect==kFALSE){
250 //integrate charge over pad for different distance of pad
251 for (Int_t i =0; i<fNRF;i++)
252 { //x in cm fpadWidth in cm
253 Float_t x = (Float_t)(i-fNRF/2)/fDSTEPM1;
254 Float_t x1=TMath::Max(x-fpadWidth/2,-5*forigsigma);
255 Float_t x2=TMath::Min(x+fpadWidth/2,5*forigsigma);
257 fkNorm*fGRF->Integral(x1,x2,funParam,0.0001)/fInteg;
261 for (Int_t i =0; i<fNRF;i++)
262 { //x in cm fpadWidth in cm
263 Float_t x = (Float_t)(i-fNRF/2)/fDSTEPM1;
264 fcharge[i] = fkNorm*fGRF->Eval(x);
270 for (Float_t x =-fNRF/fDSTEPM1; x<fNRF/fDSTEPM1;x+=1/fDSTEPM1)
271 { //x in cm fpadWidth in cm
272 Float_t weight = GetRF(x+fOffset);
279 fSigma = TMath::Sqrt(fSigma/sum-mean*mean);
284 void AliTPCRF1D::Streamer(TBuffer &R__b)
286 // Stream an object of class AliTPCRF1D.
288 if (R__b.IsReading()) {
289 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
290 TObject::Streamer(R__b);
291 //read pad parameters
293 //read charge parameters
302 R__b >> fPadDistance;
310 if (strncmp(fType,"User",3)==0){
315 if (strncmp(fType,"Gauss",3)==0)
316 fGRF = new TF1("fun",funGauss,-5.,5.,4);
317 if (strncmp(fType,"Cosh",3)==0)
318 fGRF = new TF1("fun",funCosh,-5.,5.,4);
319 if (strncmp(fType,"Gati",3)==0)
320 fGRF = new TF1("fun",funGati,-5.,5.,4);
323 R__b.ReadFastArray(fcharge,fNRF);
324 R__b.ReadFastArray(funParam,5);
325 if (fGRF!=0) fGRF->SetParameters(funParam);
328 R__b.WriteVersion(AliTPCRF1D::IsA());
329 TObject::Streamer(R__b);
332 //write charge parameters
341 R__b << fPadDistance;
344 //write interpolation parameters
345 if (strncmp(fType,"User",3)==0) R__b <<fGRF;
348 R__b.WriteFastArray(fcharge,fNRF);
349 R__b.WriteFastArray(funParam,5);