Faouzi Attallah wrote: > > Hi Everybody > > I would like to fill up a histogram (hf) with a user-weight-error, > such as > hf->Fill(xval, xweight) ; > hf->FillError(xval, error) ; > > The problem is my *vector(xval, xweight, error) is not sorted to > allow any use of TH1::SetBinContent()/SetBinError() > Any suggestion .. > > Greetings, Hi Faouzi, The normal procedure to fill an histogram with weights and correct storage of the error bars is: TH1F *hf = new TH1F("hf",... hf->Sumw2(); hf->Fill(xval,xweight); The error in bin I will be computed by taking sqrt((sum of xweight)^2) Rene Brun
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