Re: [ROOT] THStack with variable-binned TH2

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Apr 17 2003 - 10:48:31 MEST


Hi Chris,

Thanks for reporting this problem with THStack and variable bin size 2-d
histograms. We will fix the problem and will let you know.

Rene Brun

Chris Roat wrote:
> 
> I think that THStack somehow loses it's variable
> binning for 2D histograms.  It seems to work
> fine for 1D.  See the code below for the 2D case.
> 
> I don't think it's a problem in BuildStack(),
> which clones 2D histos.  The Paint() method is a
> little cryptic to me.  Any help would be
> appreciated!
> 
> Chris
> 
>   // bins variable
>   Float_t bins[4]= { -3, -0.5, 0.5, 3 };
> 
>   // create histos and fill randomly
>   TH1 *h2 = new TH2F("h2","h2",3,bins,3,bins);
>   TH1 *h2a = new TH2F("h2a","h2a",3,bins,3,bins);
> 
>   h2->SetFillColor(kBlue);
>   h2->FillRandom("gaus",1000);
>   h2a->SetFillColor(kRed);
>   h2a->FillRandom("gaus",40);
> 
>   // make a stack and draw it
>   THStack *hs2= new THStack();
>   hs2->Add(h2,"LEGO");
>   hs2->Add(h2a,"LEGO");
>   hs2->Draw();



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