Details
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Bug
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Status: Resolved (View Workflow)
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High
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Resolution: Fixed
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5.34/00
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None
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slc6
Description
I am finding that plotting RooRealSumPdf the first time, with the Normalization(1.,RooAbsReal::RelativeExpected) option does not normalize to the expected number of events the first time the pdf is drawn. Here's a not-so-minimal example:
using namespace RooFit;
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TH1D* h = new TH1D("h","h",2,0,2);
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h->SetBinContent(1,2); h->SetBinContent(2,5);
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h->SetBinError(1,1.1); h->SetBinError(2,3.3);
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RooRealVar x("x","x",0,2);x.setBins(2);
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RooDataHist d("d","d",RooArgList(x),h);
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RooHistFunc nominals("f","f",x,d);
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RooRealVar binWidth("binWidth","binWidth",1);
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RooRealSumPdf m("m","m",RooArgList(nominals),RooArgList(binWidth),true);
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RooPlot* f = x.frame();
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m.plotOn(f,Normalization(1.0,RooAbsReal::RelativeExpected));
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m.plotOn(f,Normalization(1.0,RooAbsReal::RelativeExpected),LineColor(kRed));
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f->Draw();
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