Hi Ulrich, My guess is that your histograms are destroyed somewhere in your process. Could you send me a simplified version of your macro ? Rene Brun Ulrich Husemann wrote: > > Dear Rooters! > > I try to write a macro to paint several histograms into different pads in > a canvas. The procedure is the following: > 1) create pads > 2) pad.cd(); > 3) book histogram > 4) Draw contents of some root file and pipe them into the histogram > > If I stop here, nothing is painted. > > But if I do a > > gPad->Update(); > > I can see the histogram for a few milliseconds before it is gone (the > frames and the stat box are still there). > > Ulrich
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