Hi, I noticed that the errors on my histograms are not scaling when I divide the histogram by a TF1 function. The data points are correctly divided but not the errors. I wrote a stupid macro to try to understand this... void test(){ c1 = new TCanvas("c1","Data Analysis ",100,20,800,700); c1->Divide(1,2); TH1D *h1 = new TH1D("h1","h1",5,0,5); h1->Sumw2(); TF1 *f1 = new TF1("f1","x",0,5); TF1 *f2 = new TF1("f2","100",0,5); Double_t temp; for(Int_t i=0;i<10000;i++){ temp=f1->GetRandom(); h1->Fill(temp); } c1.cd(1); h1->DrawCopy(); c1.cd(2); h1->Divide(f2); h1->Draw(); } and you can see the errors are not scaled when h1 is divided by f2 which is just a function equal to 100. Is this the intended behavior? Do I have to loop through all the bins and use GetBinError() and SetBinError() to scale the error bars? Andrew
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