Hi Matt, On Tue, 9 Jul 2002, Matt Palmer wrote: > Hi, > I've noticed a couple of problems with THStack. > 1) If you try to add a histogram after having drawn the THStack, then try and > draw it, you get a seg fault. The problem is that BuildStack just returns > fStack if it is already non-zero. It should probably check that > fStack->GetEntriesFast() == fHists->GetEntriesFast() > You are right. The simplest solution is to invalidate the stack by calling the function THStack::Modified when calling THStack::Add. I have added this mod to the development version in CVS. > 2) The copy contructor is just the default . This means that fStack gets > copied too. If the above was fixed then the following code would show > identical output: I have also implemented the copy constructor. Thanks for all these suggestions. Rene Brun > > THStack s1 ("1", "1"); > s1.Add(h1); > s1.Add(h2); > THStack s2(s1); > s2.Add(h3); > s1.Draw("h"); > new TCanvas("c2", "c2"); > s2.Draw("h"); > > Matt >
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