Hi, I guess, it’s an easy question. How can I loop over the names of the histograms in a root file ?
Below are the format of the histogram names in the root file:
h_Name_1_eta
h_Name_2_eta
h_Name_3_eta
and the histograms are under a directory called “plots” in the root file.
p.s Since there are many histograms, I don’t want to use the following option
const Int_t nhist=5;
char *hnames[nhist] = {"h_Name=1_eta","h_Name_2_eta",...};
TH1 *hist[nhist];
Thanks in advance .