Re: [ROOT] TProfile empty bins not empty (in fact Poisson)

From: Rene Brun (Rene.Brun@cern.ch)
Date: Wed Oct 01 2003 - 10:20:38 MEST


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");

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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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