Hi rooters,
I have a root file which contains some ntuples. Now I want to write a
macro to do some analysis on these ntuples and put the results which are
also some histograms and ntuples under a created analysis subdirectory
which are associated with the root file. My macro is such as:
{
TFile* f = new TFile("data.root");
f->mkdir("analysis");// make a subdirectory to hold the result
f->cd("analysis"); // change to the created subdirectory
TH1F* p1 = TH1F("h1","h1",100, 0., 120.); //create some result histograms
TH1F* p2 = TH1F("h2","h2",100, 0., 1000.);
TH1F* p3 = TH1F("h3","h3",100, 0., 10.);
gFile->cd(); // go back to the top directory
nt1->Project("h1","t0"); //fill the histogram in the subdirectory
}
It failed because h1 is not in the current directory. But I don't know how
to specify the path for the h1. Who could tell me how to do it?
regards,
zhou
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