Hi, I have some questions on TF1:Integral(Double_t* a, Double_t* b, Double_t* params, Double_t* epsilon). I don't understand what is this params all about. Actually I want to know where do you specify the integration variable. To be more specific, I define a function fitf(double* x, double* par) and I define TF1 f1("ff", "fitf", 0.50, 1.50) and inside the fitf function I have a variable y, which is the one I want to be my integration variable and not x. So, I think, y should also be an argument of the function, is it necessary like that? or can I specify y to be my integration variable when I call the integral routine. And also I have been trying to use f1.DrawIntegral() and its giving some linking errors, what am I supposed to do. Can you give an example of some sort and explain it to me. Thank you, Siva.
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