David Hardtke wrote: > > Hi, > > Question # 1: > > I have a 2 dimensional histogram (TH2F). The dimensions are 1000 X 1000. > I wish to plot bins 0-100 in x and 0-100 in y. How do I go about doing > that? > Hi Dave, You can use the mouse when you use the DrawPanel. However, this is not very precise and drawing anyhow a 1000x1000 TH2 takes time. The solution is to set the range for the x and y axis. This is valid for 1-d,2-d 3-d plots. h->GetXaxis()->SetRange(0,100); h->GetYaxis()->SetRange(0,100); h->Draw(); > Question # 2: > > In nearly every ROOT session, I end up with: > > *** Break *** segmentation violation > > This, of course, means I did something wrong. Is there anyway to recover > from this without starting over? > I cannot do much with just this information. Could you run Root under the debugger and send me the traceback when you get the segmentation violation. To use the debugger (I assume you are on a Unix system), use gdb gdb root.exe run ... your session gdb> info stack Also some explanation of what you are doing what the crash appears would be welcome. Rene Brun
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