Dear ROOTers,
I have an object TTree (nt) which contains a variable x. Now I want to draw
and pipe x into a 1d histgram after some cuts. Within ROOT I do:
root> nt->Draw("x","cuts");
As far as I understand this automatically creates a temporary hist htemp.
So, if I type
root> htemp->GetEntries();
I get the number of events after applying the above cut. This works
fine within ROOT.
Now I have a compiled version of my code. Inside the code I have
nt->Draw("x","cuts") which works as expected, i.e. it draws the
histogram in my canvas. But now "htemp->GetEntries" returns always
"0". Even explicit piping (nt->Draw("x>>somehist","cuts")) doesn't
work.
Does anybody have an idea how I can access the number of events after
the cuts?
Thanks.
Wolfgang
P.S. I use ROOT 3.01/06 on RH 7.1
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