Thank you so much for your quick reply. Using your attached programs in previous mail, I modified one of the programs (pym.C) like bottom of this mail (mod_pym.C) for compiling via g++. I certainly could do what I want to do. But, I got new error message. Error in <TApplication::TApplication>: only one instance of TApplication allowed What is the meaning ? And also I have one more question. In fact, ProjectionXY is defiend in my origianl main program and h , other histograms(h1_px, h1_py) and pad are also defined in the top of the main program like below. This procedure is wrong ? In such a case that I want to do, Must I separate ProjectionXY in atnoter file in order to use gROOT->ProcessLine() ? TH2F *h; TH1F *h1_px, *h1_py; TPad *pad[4]; int main ( int argc, char** argv ) { : : } void ProjectionXY() { : : } Thank you, Harufumi Tsuchiya ------------------------- mod_pym.C ------------------------- #include <TROOT.h> #include <TH1.h> #include <TH2.h> #include <TExec.h> #include <TCanvas.h> #include <TFile.h> #include <TApplication.h> TH2F *h; TH1D *h1_px, *h1_py; int main (int argc, char** argv) { gROOT->ProcessLine(".L py.C"); TApplication *app = new TApplication("app", &argc, argv); TExec *ex_proj = new TExec("ex_proj", "ProjectionXY()"); TFile f("hsimple.root"); h = (TH2F*)gDirectory->Get("hpxpy"); h->GetListOfFunctions()->Add(ex_proj); h1_px = 0; h1_py = 0; TCanvas c1("c1"); c1.Divide(2,2); c1.cd(1); h->Draw("colz"); app->Run(); }
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