Re: [ROOT] Superimposing histograms ?

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Aug 15 2002 - 22:07:22 MEST


Hi Fred,

Replace:
   TH1F *h3368   = new TH1F("h3368  ","Total   ",400,3.2,3.5);
by
   TH1F *h3368   = new TH1F("h3368 ","Total   ",400,3.2,3.5);

blanks are significant in names. As a result;
   mc->Draw("Eg >> h3368","Eg>3 && Eg<3.5");
cannot find the histogran named "h3368"

Rene Brun


On Thu, 15 Aug 2002, Fred Sarazin wrote:

> Hi,
> 
> I generate two histograms from a tree... in the following example, I
> superimpose the results
> of one "Branch" with the results for all the "Branch"'s... for some reason,
> the Nbins of the first histogram is 100 whereas the other one
> is 400 as expected (that's what I get from the "inspect" feature)...
> Moreover, when I have a closer look in a zoomed arera, the edge of the bins
> of both histograms don't seem to overlap (and I have roughly 2 bins
> for h3368b2 for 1 bin of h3368 instead of a ratio of 4 to 1 if the "inspect"
> statement was correct !)
> 
> What's wrong ?
> 
> thanks,
> 
> Fred
> 
> -------------------
> 
>   TH1F *h3368   = new TH1F("h3368  ","Total   ",400,3.2,3.5);
>   TH1F *h3368b2 = new TH1F("h3368b2","Branch 2",400,3.2,3.5);
> 
>   TCanvas *c = new TCanvas();
> 
>   mc->Draw("Eg >> h3368","Eg>3 && Eg<3.5");
>   mc->Draw("Eg >> h3368b2","Eg>3 && Eg<3.5 && Branch==2","same");
> 
> 



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