Dear rooters,
I create a TFile with two subdirectories:
TFile = histofile.root
TDirectory subdirectories pythia, zjet
If I open the file in the TBrowser I can perfectly well access the
histograms but I need to to this in a macro. I attached the histofile.root
my Macro:
#include <TH2.h>
#include <iostream>
TH1F *h;
int plot(){
TFile *f = new TFile("histofile.root");
pythia->cd();
char hname[20];
sprintf(hname,"h[%d]",0);
h=(TH1F*)f->Get(hname);
h->Draw();
}
gives
root [0]
Processing plot.C...
Error: illegal pointer to class object h 0x0 137 FILE:plot.C LINE:27
*** Interpreter error recovered ***
second problem:
-----------------------------------------------------------------------
if I do root histofile.root
root [0]
Attaching file histofile.root...
root [1] pythia->cd()
(Bool_t)1
root [2] gDirectory->pwd()
histofile.root:/pythia
root [3] gDirectory->cd()
(Bool_t)1
root [4] zjet->cd()
Error: Symbol zjet is not defined in current scope
FILE:/tmp/fileihS306_cint LINE:1
Error: Failed to evaluate zjet->cd()Possible candidates are...
filename line:size busy function type and name
*** Interpreter error recovered ***
But it is there. I can see it in the TBrowser.
What do I do wrong?
Thank you so much.
Meta
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