Hi Seng, I have implemented your suggestion in the CVS version. When a custom histogram is specified, the empty histogram will be drawn even if the selection has generated 0 entries. Rene Brun Woon-Seng Choong wrote: > > I have an ntuple which contain variables var1, var2 and var3. > Now, the selection > ntuple->Draw("var1>>hist(256,-0.5,255.5)", "var2==0) > gives zero entries. The question is why it draws nothing instead of an > empty histogram. In addition > (TH1F *)gPad->GetPrimitive("hist") > gives a zero pointer. I know why it gives a zero pointer because the > pad is empty. But it would be reasonable to get a pointer to a > histogram with zero entries. > > Thank you > Seng
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