Hi Rene, On Wed, 2 Dec 1998, Rene Brun wrote: > 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 > You are right as long as its a statistical error, which is not my case where , e.g., error = xweight/sqrt(n) ; n being the Number of averages in Schottky spectra. Any other suggestion.. Greetings, Faouzi
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