Hi Rene, One of TF1 constructors is to create TF1 from a user defined function TF1 TF1(const char* name, void* fcn, Float_t xmin, Float_t xmax, Int_t npar) It works fine in case of CINT Double_t myfunction(Double_t *x, Double_t *par) { Float_t xx =x[0]; Double_t f = TMath::Abs(par[0]*sin(par[1]*xx)/xx); return f; } void myfunc() { TF1 *f1 = new TF1("myfunc",myfunction,0,10,2); f1->SetParameters(2,1); f1->SetParNames("constant","coefficient"); f1->Draw(); } Now if I want to create TF1 in my compiled code with myfunction defined in a macro loaded via gROOT->LoadMacro() ... where can I get a pointer (void* fcn) to myfunction for TF1 constructor? Best regards, Anton
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