Converting RooRealVar into integer to generate binomial pdf

[moneta]

Duplication of post

Using RooRealVar in Integer steps

Dear Rooters, I’m trying to generate a binomial pdf which I can then fit to my measured data. Problem is RooFit doesn’t seem to be able to compute the pdf in discrete integer steps, or to put it another way it has no functionality to allow the user to declare an integer variable, with RooRealVar() implicitly computing the pdf in arbitrary non-integer steps. Using RooRealVar("","",RooConst(x),RooConst(x1),RooConst(x2)) gives error message …"candidate constructor not viable… Using RooConstVar()…