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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