Dear Rene, I'm not sure I understand what you mean. I just would like to get an histogram which is the cumulative version of an existing one. Here is a piece of code doing what I what. Just would like to know if there is an easier (more rapid) way to get the same result: { TCanvas *c1 = new TCanvas("c1",""); c1->Divide(1,2); int nbbin =100; double xmin = -3; double xmax = 3.; TH1F *gau = new TH1F("gau","", nbbin, xmin, xmax); gau->FillRandom("gaus",10000); c1->cd(1); gau->Draw(); // We compute the cumulative version of "gau" TH1F *toto = new TH1F("toto","", nbbin, xmin, xmax); int total = 0; for (int i=0;i<nbbin;i++) { total += gau->GetBinContent(i); for (int k=0;k<total;k++) { toto->AddBinContent(i); } } double norme = 1/gau->Integral(); cout << norme << endl; toto->Scale(norme); c1->cd(2); toto->Draw(); } Guillaume Blanc On Sat, 12 Oct 2002, Rene Brun wrote: > Hi Guillaume, > > Have a look at > TH1::GetRandom, FillRandom (2 functions) > TH2::...same > TH3::..same > > Rene Brun > > On Fri, 11 Oct 2002, Guillaume Blanc wrote: > > > Hello, > > > > I would like to know if there is an easy way to get a cumulative > > histogram? (like "call hrndm1(histo)" in PAW) > > > > Guillaume Blanc > > > >
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