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"
28 // Class to organize the histograms in the first run
29 // in the Lee Yang Zeros Flow analysis.
30 // Also contains methods to find the first minimum R0
31 // of the generating function.
32 // author: N. van der Kolk (kolk@nikhef.nl)
34 ClassImp(AliFlowLYZHist1)
36 //-----------------------------------------------------------------------
38 AliFlowLYZHist1::AliFlowLYZHist1():
48 //-----------------------------------------------------------------------
50 AliFlowLYZHist1::AliFlowLYZHist1(Int_t theta, const char *anInput,const char *aTitle):
51 TNamed(anInput,aTitle),
58 //constructor creating histograms
59 Int_t iNbins = AliFlowLYZConstants::kNbins;
60 Double_t dMin = AliFlowLYZConstants::fgMin;
61 Double_t dMax = AliFlowLYZConstants::fgMax;
66 name = "First_Flow_Gtheta";
69 title = "First_Flow_Gtheta";
72 fHistGtheta = new TH1D(name.Data(),title.Data(),iNbins,dMin,dMax);
73 fHistGtheta->SetXTitle("r");
74 fHistGtheta->SetYTitle("|G^{#theta}(ir)|^{2}");
77 name = "First_FlowPro_ReGtheta";
80 title = "First_FlowPro_ReGtheta";
83 fHistProReGtheta = new TProfile(name.Data(),title.Data(),iNbins,dMin,dMax);
84 fHistProReGtheta->SetXTitle("r");
85 fHistProReGtheta->SetYTitle("Re G^{#theta}(ir)");
88 name = "First_FlowPro_ImGtheta";
91 title = "First_FlowPro_ImGtheta";
94 fHistProImGtheta = new TProfile(name.Data(),title.Data(),iNbins,dMin,dMax);
95 fHistProImGtheta->SetXTitle("r");
96 fHistProImGtheta->SetYTitle("Im G^{#theta}(ir)");
99 fHistList = new TList();
100 fHistList-> Add(fHistGtheta);
101 fHistList-> Add(fHistProReGtheta);
102 fHistList-> Add(fHistProImGtheta);
106 //-----------------------------------------------------------------------
108 AliFlowLYZHist1::~AliFlowLYZHist1()
112 delete fHistProReGtheta;
113 delete fHistProImGtheta;
117 //-----------------------------------------------------------------------
119 void AliFlowLYZHist1::Fill(Double_t f, TComplex c)
121 //fill the histograms
123 fHistProReGtheta->Fill(f, c.Re());
124 fHistProImGtheta->Fill(f, c.Im());
127 //-----------------------------------------------------------------------
129 TH1D* AliFlowLYZHist1::FillGtheta()
131 //fill the fHistGtheta histograms
132 Int_t iNbins = fHistGtheta->GetNbinsX();
133 for (Int_t bin=1;bin<=iNbins;bin++)
135 //get bincentre of bins in histogram
136 Double_t dBin = fHistGtheta->GetBinCenter(bin);
137 Double_t dRe = fHistProReGtheta->GetBinContent(bin);
138 Double_t dIm = fHistProImGtheta->GetBinContent(bin);
139 TComplex cGtheta(dRe,dIm);
140 //fill fHistGtheta with the modulus squared of cGtheta
141 fHistGtheta->Fill(dBin,cGtheta.Rho2());
147 //-----------------------------------------------------------------------
149 Double_t AliFlowLYZHist1::GetR0()
151 //find the first minimum of the square of the modulus of Gtheta
153 Int_t iNbins = fHistGtheta->GetNbinsX();
156 for (Int_t b=2;b<iNbins;b++)
158 Double_t dG0 = fHistGtheta->GetBinContent(b);
159 Double_t dGnext = fHistGtheta->GetBinContent(b+1);
160 Double_t dGnextnext = fHistGtheta->GetBinContent(b+2);
162 if (dGnext > dG0 && dGnextnext > dG0)
164 Double_t dGlast = fHistGtheta->GetBinContent(b-1);
165 Double_t dXlast = fHistGtheta->GetBinCenter(b-1);
166 Double_t dX0 = fHistGtheta->GetBinCenter(b);
167 Double_t dXnext = fHistGtheta->GetBinCenter(b+1);
169 dR0 = dX0 - ((dX0-dXlast)*(dX0-dXlast)*(dG0-dGnext) - (dX0-dXnext)*(dX0-dXnext)*(dG0-dGlast))/
170 (2.*((dX0-dXlast)*(dG0-dGnext) - (dX0-dXnext)*(dG0-dGlast))); //interpolated minimum
172 break; //stop loop if minimum is found
181 //-----------------------------------------------------------------------
182 Double_t AliFlowLYZHist1::GetBinCenter(Int_t i)
184 //gets bincenter of histogram
185 Double_t dR = fHistGtheta->GetBinCenter(i);
189 //-----------------------------------------------------------------------
191 Int_t AliFlowLYZHist1::GetNBins()
194 Int_t iNbins = fHistGtheta->GetNbinsX();
198 //-----------------------------------------------------------------------
199 Double_t AliFlowLYZHist1::Merge(TCollection *aList)
202 if (!aList) return 0;
203 if (aList->IsEmpty()) return 0; //no merging is needed
206 TIter next(aList); // list is supposed to contain only objects of the same type as this
207 AliFlowLYZHist1 *toMerge;
208 // make a temporary list
209 TList *pTemp = new TList();
210 while ((toMerge=(AliFlowLYZHist1*)next())) {
211 pTemp->Add(toMerge->GetHistList());
214 // Now call merge for fHistList providing temp list
215 fHistList->Merge(pTemp);
219 return (double)iCount;
223 //-----------------------------------------------------------------------
224 void AliFlowLYZHist1::Print(Option_t *option) const
226 // -*-*-*-*-*Print some global quantities for this histogram collection class *-*-*-*-*-*-*-*
227 // ===============================================
228 // printf( "TH1.Print Name = %s, Entries= %d, Total sum= %g\n",GetName(),Int_t(fEntries),GetSumOfWeights());
229 printf( "Class.Print Name = %s, Histogram list:\n",GetName());
232 fHistList->Print(option);
236 printf( "Empty histogram list \n");
240 //-----------------------------------------------------------------------
241 void AliFlowLYZHist1::Browse(TBrowser *b)
245 if (fHistList) b->Add(fHistList,"AliFlowLYZHist1List");