Dear ROOT people, I have written the following code { #include <math.h> float distribution(float pt, float pbar) { float pzbar = sqrt(pbar*pbar-pt*pt) ; float Norm = 1. ; return (pbar*pt/2* (pbar*pzbar + pt*pt*log(pbar+pzbar)) - pt/3 * pzbar*pzbar*pzbar - pt*pt*pt * pzbar) /Norm ; }; int main() { float pbar = 4. ; TF1 func("func","distribution(x,pbar)",0,pbar) ; func.Draw(); } } which I want to use to plot the `distribution' function, using root> .L distrib.C ; root> main(); However, this doesn't work because Unknown name : "distribution(x,pbar)" although the function `distribution' is known. Can I use user defined functions in a TF1 or TFormula definition? Regards, Wouter.
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