Hi, of course it's empty, but that doesn't mean it has to crash... root [0] h1=new TH1F() (class TH1F*)0x12d8b38 root [1] h1->Draw() <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 Error in <TCanvas::Range>: illegal world coordinates range: x1=-1.#IND00, y1=26250000488944355000000000000000.000000, x2 =-1.#IND00, y2=-236250000488944360000000000000000.000000 Error in <TCanvas::RangeAxis>: illegal axis coordinates range: xmin=-1.#IND00, ymin=0.000000, xmax=-1.#IND00, ymax=-2100 00000000000010000000000000000.000000 Error in <TGraph::PaintGraphHist>: illegal number of points (0) As soon as the mouse cursor is over the canvas, root crashes (instruction at .... referenced memory at ... memory could not be read). And what's drawn in the canvas looks quite weird, too. Crashes on Win, 3.01/02 non debug. Can somebody fix that? I could imagine an histogram that is only filled conditionally in some for loop, so it might not be filled at all. Cheers, Axel.
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