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buchmann |
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#include <iostream>
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#include <iomanip>
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#include <TRandom.h>
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#include <TF1.h>
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#include <TH1.h>
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#include <TCanvas.h>
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#include <TMath.h>
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#include <sstream>
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using namespace std;
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void find68(TH1F* histo, long N, int rounds)
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{
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float max = histo->GetBinCenter(histo->GetMaximumBin());
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int startbin=histo->GetMaximumBin();
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int left=startbin;
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int right=startbin;
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float want=(float)N * 0.68*rounds;
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float have=histo->GetBinContent(startbin);
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cout << "found maximum at " << max << " ( this is bin " << startbin << ")" << endl;
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while(have<want)
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{
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if(histo->GetBinContent(left-1)>histo->GetBinContent(right+1))
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{
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have+=histo->GetBinContent(left-1);
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left--;
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}
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else
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{
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have+=histo->GetBinContent(right+1);
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right++;
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}
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}
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float loweredge=histo->GetBinCenter(left);
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float upperedge=histo->GetBinCenter(right);
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cout << "we now have " << have << " and we wanted at least " << want << endl;
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cout << "the range is " << loweredge << " to " << upperedge<< " corresponding to :" << endl;
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cout << "\033[1;34m " << max << "+ " << (upperedge-max) << " - " << (max-loweredge) << " \033[0m" << endl;
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// cout << max << "+ " << (upperedge-max) << " - " << (max-loweredge) << endl;
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}
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void combine_dists(TH1F *combineddist,float *x1,float *x2,float *x3, long N)
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{
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float temp=-99;
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for (int i=0;i<N;i++)
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{
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temp = x1[i]+x2[i]-x3[i];
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combineddist->Fill(temp);
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}
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}
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void megagenerate(TH1F *histo, unsigned int N, unsigned int rounds)
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{
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float lambda=5;
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stringstream function1,function2, function3;
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function1 << "(TMath::Power(" << lambda << ",x)*TMath::Exp(-" << lambda << "))/(TMath::Gamma(x+1))";
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lambda=4;
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function2 << "(TMath::Power(" << lambda << ",x)*TMath::Exp(-" << lambda << "))/(TMath::Gamma(x+1))";
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lambda=1;
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function3 << "(TMath::Power(" << lambda << ",x)*TMath::Exp(-" << lambda << "))/(TMath::Gamma(x+1))";
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TF1 *f1 = new TF1("f1",function1.str().c_str(),0,10);
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TF1 *f2 = new TF1("f2",function2.str().c_str(),0,10);
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TF1 *f3 = new TF1("f3",function3.str().c_str(),0,10);
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for (int iround=0; iround<rounds;iround++)
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{
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for (int i=0;i<N;i++)
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{
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histo->Fill(f1->GetRandom()+f2->GetRandom()-f3->GetRandom());
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}//for i
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cout << "we now have " << histo->GetEntries() << endl;
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}// for rounds
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}
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void generate(float *x1, int lambda,long N,TH1F* histo)
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{
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stringstream function;
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function << "(TMath::Power(" << lambda << ",x)*TMath::Exp(-" << lambda << "))/(TMath::Gamma(x+1))";
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//TF1 *f1 = new TF1("f1","(TMath::Power(1,x)*TMath::Exp(-1))/(TMath::Gamma(x+1))",0,10);
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TF1 *f1 = new TF1("f1",function.str().c_str(),0,10);
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for(int i=0;i<N;i++)
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{
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x1[i]=f1->GetRandom();
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histo->Fill(x1[i]);
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}//end of for
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}//end of generate_x1
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int main()
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{
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long N=1000000;
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int rounds=1000;
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cout << "generating the distributions with N= " << N << " and rounds = " << rounds << endl;
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TH1F *summary = new TH1F("summary","summary",1000,0,20);
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TCanvas *c1 = new TCanvas("c1","c1");
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megagenerate(summary,N,rounds);
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cout << "Currently there are " << summary->GetEntries() << " entries" << endl;
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// combine_dists(combineddist2,x1,x2,x3,N);
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summary->Draw();
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c1->SaveAs("MegaCanvas.png");
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find68(summary,N,rounds);
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return 0;
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}
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