I am using ROOT version 2.24/04 on IRIX at CDF When I fit a TGraph with a polinomial function of grade 1 I have problems retreiving the fitting parameters. I do the follow: TGraph *emGr[24]; TGraph *hadGr[24]; .................. for(k1=0................. emGr[k1]= new TGraph(nentries,xetmp,yetmp); hadGr[k1]= new TGraph(nentries,xhadtmp,yhadtmp); //xetmp and yetmp are arrays emGr[k1]->Fit("pol1","Q",""); hadGr[k1]->Fit("pol1","Q",""); emf[k1] = emGr[k1]->GetFunction("pol1"); if(emf[k1]!=0) printf("p1: %f\n",emf[k1]->GetParameter(1)); my problem is that the pointer returned by GetFunction is always 0... Any suggestion... Thanks very much ************************************************************** * Antoni Munar Ara munar@fnal.gov * * * * INFN Sezione di Pisa * * Fermi National Laboratory Phone: (630)840-8426 * * P.O. Box 500, MS 223 * * Batavia, IL 60510 * * U.S.A. * **************************************************************
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