Thomas Kraemerkaemper wrote: > I can't get a plot on top of a predefined coordinate system. What I > have tried so far looks like: > > { > gROOT->Reset(); > > TFile f("output.root"); > f.ls(); > > TCanvas *canvas = new TCanvas("canvas", "My Canvas", 0, 0, 640,80); > canvas->RangeAxis(0., 0., 60., 60.); > // canvas->Range yields to the same (wrong) result. > ntuple.Draw("x:y", "", "BOX"); > } > > The ntuple.Draw() ignores the 'RangeAxis' and plots in my example in > the range (0., 0., 60., 55.). > > With 'ntuple.Draw("x:y", "", "BOXSAME");' nothing is shown at all. > > Did I misunderstand the aim of RangeAxis? How can I directly access > the TAxis-objects after ntuple.Draw()? > > Bye, Thomas Kr"amerk"amper. When the option same is used in a TTree::Draw call, we create a temporary histogram object with the same parameters as the previous histogram object. We assume that there is always one. In your example, this is not the case. I will also take into account this particular case in the next version. Meanwhile, you can do the following: TH2F hframe("hframe","",40,0,60,40,0,60); hframe.Draw(); ntuple.Draw("x:y","","boxsame"); Rene Brun
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