Hello, my problem for today is that i would like to define a TFormula with a factorial in it (poisson distribution) with the aim of being able to evaluate and integrate it at non-integer points.. i have a bit of c++ code that works out factorials but i want to be able to define the formula and plot it as a function.. do you have any examples of this? cheers, Dan. -- CMS-Bristol http://cern.ch/dan.holmes
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