Hi Ivan,
Do:
TFile *flMC_file = new TFile("mc.root");
TFile* file = TFile::Open("data.root", "RECREATE"); // my output file
TH1D* h1dMC_NN = (TH1D*)flMC_file->Get("h1dNN");
....
flMC_file->GetList()Write(); //write in memory objects of 1st file to the
current file
Rene Brun
Ivan Glushkov wrote:
>
> Hello,
>
> So, what I want to do is to take some histogram, saved in a root file,
> and use it in my program, and save it in the new output file from my
> program. Looks easy. Here is my code:
>
> int main(int argc, char* argv[])
> {
> TFile *flMC_file = new TFile("mc.root"); //the file in which I already
> have my histogram (h1dNN) stored
> TFile* file = TFile::Open("data.root", "RECREATE"); // my output file
> TH1D* h1dMC_NN = (TH1D*)flMC_file->Get("h1dNN");
> ....
> file->Write();
> file->Close();
>
> And the histogram is not in the file (but all other histograms created
> later are there)
>
> Do you have an idea what is the problem?
>
> Cheers, Ivan
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