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 **************************************************************************/
17 //#include "Riostream.h" //in case one wants to make print statements
22 #include "AliFlowLYZConstants.h"
23 #include "AliFlowLYZHist1.h"
27 // Class to organize the histograms in the first run
28 // in the Lee Yang Zeros Flow analysis.
29 // Also contains methods to find the first minimum R0
30 // of the generating function.
31 // author: N. van der Kolk (kolk@nikhef.nl)
33 ClassImp(AliFlowLYZHist1)
35 //-----------------------------------------------------------------------
37 AliFlowLYZHist1::AliFlowLYZHist1():
47 //-----------------------------------------------------------------------
49 AliFlowLYZHist1::AliFlowLYZHist1(Int_t theta):
57 //constructor creating histograms
58 Int_t iNbins = AliFlowLYZConstants::kNbins;
59 Double_t dMin = AliFlowLYZConstants::fgMin;
60 Double_t dMax = AliFlowLYZConstants::fgMax;
65 name = "First_Flow_Gtheta";
68 title = "First_Flow_Gtheta";
71 fHistGtheta = new TH1D(name.Data(),title.Data(),iNbins,dMin,dMax);
72 fHistGtheta->SetXTitle("r");
73 fHistGtheta->SetYTitle("|G^{#theta}(ir)|^{2}");
76 name = "First_FlowPro_ReGtheta";
79 title = "First_FlowPro_ReGtheta";
82 fHistProReGtheta = new TProfile(name.Data(),title.Data(),iNbins,dMin,dMax);
83 fHistProReGtheta->SetXTitle("r");
84 fHistProReGtheta->SetYTitle("Re G^{#theta}(ir)");
87 name = "First_FlowPro_ImGtheta";
90 title = "First_FlowPro_ImGtheta";
93 fHistProImGtheta = new TProfile(name.Data(),title.Data(),iNbins,dMin,dMax);
94 fHistProImGtheta->SetXTitle("r");
95 fHistProImGtheta->SetYTitle("Im G^{#theta}(ir)");
98 fHistList = new TList();
99 fHistList-> Add(fHistGtheta);
100 fHistList-> Add(fHistProReGtheta);
101 fHistList-> Add(fHistProImGtheta);
105 //-----------------------------------------------------------------------
107 AliFlowLYZHist1::~AliFlowLYZHist1()
111 delete fHistProReGtheta;
112 delete fHistProImGtheta;
116 //-----------------------------------------------------------------------
118 void AliFlowLYZHist1::Fill(Double_t f, TComplex c)
120 //fill the histograms
122 fHistProReGtheta->Fill(f, c.Re());
123 fHistProImGtheta->Fill(f, c.Im());
126 //-----------------------------------------------------------------------
128 TH1D* AliFlowLYZHist1::FillGtheta()
130 //fill the fHistGtheta histograms
131 Int_t iNbins = fHistGtheta->GetNbinsX();
132 for (Int_t bin=1;bin<=iNbins;bin++)
134 //get bincentre of bins in histogram
135 Double_t dBin = fHistGtheta->GetBinCenter(bin);
136 Double_t dRe = fHistProReGtheta->GetBinContent(bin);
137 Double_t dIm = fHistProImGtheta->GetBinContent(bin);
138 TComplex cGtheta(dRe,dIm);
139 //fill fHistGtheta with the modulus squared of cGtheta
140 fHistGtheta->Fill(dBin,cGtheta.Rho2());
146 //-----------------------------------------------------------------------
148 Double_t AliFlowLYZHist1::GetR0()
150 //find the first minimum of the square of the modulus of Gtheta
152 Int_t iNbins = fHistGtheta->GetNbinsX();
155 for (Int_t b=2;b<iNbins;b++)
157 Double_t dG0 = fHistGtheta->GetBinContent(b);
158 Double_t dGnext = fHistGtheta->GetBinContent(b+1);
159 Double_t dGnextnext = fHistGtheta->GetBinContent(b+2);
161 if (dGnext > dG0 && dGnextnext > dG0)
163 Double_t dGlast = fHistGtheta->GetBinContent(b-1);
164 Double_t dXlast = fHistGtheta->GetBinCenter(b-1);
165 Double_t dX0 = fHistGtheta->GetBinCenter(b);
166 Double_t dXnext = fHistGtheta->GetBinCenter(b+1);
168 dR0 = dX0 - ((dX0-dXlast)*(dX0-dXlast)*(dG0-dGnext) - (dX0-dXnext)*(dX0-dXnext)*(dG0-dGlast))/
169 (2.*((dX0-dXlast)*(dG0-dGnext) - (dX0-dXnext)*(dG0-dGlast))); //interpolated minimum
171 break; //stop loop if minimum is found
180 //-----------------------------------------------------------------------
181 Double_t AliFlowLYZHist1::GetBinCenter(Int_t i)
183 //gets bincenter of histogram
184 Double_t dR = fHistGtheta->GetBinCenter(i);
188 //-----------------------------------------------------------------------
190 Int_t AliFlowLYZHist1::GetNBins()
193 Int_t iNbins = fHistGtheta->GetNbinsX();
197 //-----------------------------------------------------------------------
198 Double_t AliFlowLYZHist1::Merge(TCollection *aList)
201 if (!aList) return 0;
202 if (aList->IsEmpty()) return 0; //no merging is needed
205 TIter next(aList); // list is supposed to contain only objects of the same type as this
206 AliFlowLYZHist1 *toMerge;
207 // make a temporary list
208 TList *pTemp = new TList();
209 while ((toMerge=(AliFlowLYZHist1*)next())) {
210 pTemp->Add(toMerge->GetHistList());
213 // Now call merge for fHistList providing temp list
214 fHistList->Merge(pTemp);
218 return (double)iCount;