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
--
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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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