Hi, You can use TMath::Poisson (as of Root 3.10) Example TF1 *f1 = new TF1("f1","TMath::Poisson([0]*x,[1])",0,6); f1->SetParameters(1,2); f1->Draw(); myhisto->Fit("f1"); When sending mails to roottalk, do not reply to an existing message with a subject that has nothing to do with your message. This is very confusing for the other readers and our search engine. Rene Brun Venkatesh Kaushik wrote: > > Hi ROOTers, > I have a dataset that resembles Poisson distribution. Is there an existing > fitting function for poisson defined in root? If not, how do I describe > the functional form for a user-defined fit? > Thanks in advance, > > Venkat.
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