Helklo Alex ROOT may crashe under Windows due some bug. Try to apply this fix attached. It should help. Valeri ----- Original Message ----- From: "Axel Naumann" <axel@fnal.gov> To: "Roottalk@Pcroot. Cern. Ch" <roottalk@pcroot.cern.ch> Sent: Thursday, May 24, 2001 4:59 PM Subject: [ROOT] TH1F::Draw on empty histogram > 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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