Hi, I read the following: ------------- Start Roottalk digest Sean Kelly wrote: > > Hi Rooters, > > I realize this has been the subject of previous posts. My question is > does the code frag below represent the simplest way to duplicate > a histogram ? > > TH1F *vxDHi = (TH1F*) vx->Clone(); > vxDHi->SetName("vxDHi"); > > thanks > > Sean Kelly Yes, This is the recommended way. TH1::Clone make sure that all the data structure supported by a TH1 object is copied. Rene Brun -------------- End Roottalk digest So, if a file named test.root contains a histogram called hist, the following should work: TFile f("test.root"); TH1F *h2 = (TH1F*) hist->Clone(); h2->SetName("h2"); h2->Draw(); f.Close(); BUT, the histogram disappears... Why???? (Using root 2.21/08 on Linux) Marco van Leeuwen
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