Jayoung,
I had the same problem, so if I may be so forward as to answer...
TGraph, and TGraphErrors do not take the "SAME" argument in their Draw
functions. To overlay, simply drop the "A" from the draw argument.
In your code sample, I have put in the modified line.
See tutorial 18 in the web pages for more details.
Chris
On Tue, 10 Mar 1998, Jayoung Wu wrote:
>
> Hi,
> I would like to plot two graphs on a plot using "TGraph". How I can do it?
> ========================== part of my code ====================
> ...
>
> TGraph *gr0 = new TGraph(pnoy,iypos,pzzy);
> TGraph *gr = new TGraph(pnoy,pypos,pzzy);
>
> pad0->Draw();
> pad0->cd();
> Float_t xr[2] = {-23.0,23.0};
> Float_t yr[2] = {-25,48.25};
> Int_t nch = 2;
> gr0->PaintGraph(nch,xr,yr,"AP");
> gr0->Draw("AL*");
>
> gr->SetMarkerColor(4);
> gr->SetMarkerStyle(21);
> gr->Draw("Same");
Try
gr->Draw("L"); // for example a line graph on the same plot.
// Do not put the A in.
>
> pad0->Modified();
> ================================================================
> When I execute the macro, it plot only "gr0" not "gr" without any warning
> or error message. Do you have any idea?
> TF1 seems to be able to superimpose a plot on top of existing picture.
> Is TGraph able to do it?
>
> ---
> Thanks a lot!
> Jayoung
>
>
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