Hi Zhou,
Remove the statement:
gFile->cd(); // go back to the top directory
Rene Brun
Zhou Zhang wrote:
>
> 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
This archive was generated by hypermail 2b29 : Tue Jan 02 2001 - 11:50:27 MET