Suppose I have a TGraph with a lot of points, I want to plot only a small part of them. In particual suppose the X range of the graph is from 0 to 100. I want to plot only from 0 to 50, so I can use TGraph::GetXaxis()->SetRangeUser(0,50); But what about the y range? I want to auto adjust it. The bi…

couet February 15, 2011, 4:13pm 2

The viewing range for a histogram axis can be set from bin ifirst to ilast using the method TAxis::SetRange(ifirst, ilast). Example (hpxpy is a 2D histogram): { TFile f("hsimple.root"); hpxpy->Draw("colz"); hpxpy->GetYaxis()->SetRange(22,23); hpxpy->GetXaxis()->SetRange(18,19); } Sometimes it is more convenient to set this range using “User’s Coordinates” (axis values) rather than bin numbers. To do that one should use TAxis::SetRangeUser(ufirst, ulast). This method computes the cl…

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Automatic zoom in a TGraph