Hi, I tried combining several TGraphs into a single plot. However, I can't make it work. Should this boiled down example work (macro) ? { Int_t n = 5; Double_t x[n] = { 60,60.1,60.2,60.3,60.4 }; TGraph *gr = new TGraph(n,x,x); TMultiGraph *mg = new TMultiGraph(); mg->Add(gr); mg->Draw("AL"); } After starting root and executing the macro, I get the following error message: <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 Error in <TCanvas::Range>: illegal world coordinates range: x1=15000000055879354670346081189857239812301458438980120411468904470533805084809352140353424763585036288.000000, y1=12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000, x2=-15000000055879354670346081189857239812301458438980120411468904470533805084809352140353424763585036288.000000, y2=12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000 Error in <TCanvas::RangeAxis>: illegal axis coordinates range: xmin=12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000, ymin=12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000, xmax=-12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000, ymax=12000000000000000579368471762264830745925351641438118996218960879725310776966939220757021024069877760.000000 A canvas is created but the graph does not appear. Drawing the Graph gr directly works without any problems. I also experimented with the TMultiGraph example in the User's Guide on Page 58. I get a similar error message when I comment (remove) the line mg->Add(gr2); i.e. the example doesn't work when the TGraphErrors is not added. Any ideas ? thanks, André -- ------------------+---------------------------------- Andre Holzner | +41 22 76 76750 Bureau 32 2-C13 | Building 32 CERN | Office 2-C13 CH-1211 Geneve 23 | http://wwweth.cern.ch/~holzner/
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