proj ntuple into predefined histogram

From: Stephen Bailey (bailey@physics.harvard.edu)
Date: Tue Aug 18 1998 - 22:16:54 MEST


Hi.

I'm trying to project an ntuple into a histogram which I
defined so that I can control the number of bins used.
e.g.

   TH1F h1 = new TH1F("blat", "quat", 20, 4.5, 6);
   ntuple->Draw("m>>+h1", "(4.5<m)&&(m<6.0)");
   h1->Draw();

I also tryed m>>h1, but the ntuple->Draw command always
picks its own choice for number of bins and h1 always
seems to remain empty.  If I don't predefine h1 then it
gets created and properly filled but I don't have control
over the number of bins.

Is there a way to do this easily (i.e. without looping
trough the ntuple and filling the histogram event by event)?

Thanks.

Stephen Bailey



This archive was generated by hypermail 2b29 : Tue Jan 04 2000 - 00:34:36 MET