Hi, I want to fit an user function to a profile histogram: [first part of the macro is sniped] h1->Draw("sm2:p>>smprof","side==1","profs"); TF1 *fun2 = new TF1("fun2","[0]+[1]*pow(x,2)",3,10,2); fun2->SetParName(0,"const"); fun2->SetParName(1,"sigma_b"); fun2->SetParameter(0,0.03); fun2->SetParameter(1,0.003); smprof->Fit("fun2"); [the rest also] I'm doing this in a macro, but all I get is a 'segmentation violation'. If i comment out the fit part it is working and making the histogram, but with it I get the error every time. I tried different names and functions but it's still the same. I'm running root version 1.01/07 on a Sparc 20. I hope anyone can help. Greetings Torsten -- //////////////////////////////////////////////////////////////////// / Torsten Henkel Fachbereich Physik / / AG Schwerionenphysik Philipps-Universitaet Marburg / / Renthof 5 Telephon: +49-6421-284128 / / 35032 Marburg Fax: +49-6421-288993 / ////////////////////////////////////////////////////////////////////
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