Hi Alexey, To get a pointer to any primitive in a pad/canvas, use TPad::GetPrimitive. Example: Root > bgoadc.Draw("a0","lay==0"); Root > TH1F *htemp = (TH1F*)can->GetPrimitive("htemp"); the above will work in all cases (recommended). In an interactive session, you can also use the shortcut: Root > bgoadc.Draw("a0","lay==0"); Root > htemp->Fit("gaus"); By default, Root look for named objects in the current directory and in the current pad/canvas Rene Brun Alexey Toptygin wrote: > > Here's what I'm doing: > > { > ... > TFile file("ntuple.root"); > TCanvas *can = new TCanvas("filename", "Histogram"); > bgoadc.Draw("a0","lay==0"); //bgoadc is a TNtuple in ntiple.root > ... > TH1F::htemp->Fit("gaus"); //kludge > ... > can->Print(); > ... > } > > Now, the line using TH1F::htemp is a kludge. I shoid really be using a > pointer to htemp in *can, but I don't know how to get one. > Any suggestions? > Alexey
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