Olivier will investigate this problem once he will be back from holidays
at the end of the month.
Rene Brun
Matthew Strait wrote:
> I want to draw a 3D scatter plot together with a fit plane. Here's a
> very simple macro that should do that:
>
> {
> TF2 aplane("aplane", "1+2*x-y", -10, 10, -10, 10);
>
> TGraph2D somedata;
> somedata.SetPoint(0, 0, 0, 1); // should be on plane
> somedata.SetPoint(1, 1, 1, 2); // ditto
> somedata.SetPoint(2, 2, 1, 4); // ditto
> somedata.SetPoint(3, 1, 2, 1); // ditto
> somedata.SetPoint(4, 5, 5, -4); // One off the plane
>
> aplane.Draw("surf");
> somedata.Draw("same p0");
> }
>
> But the points are not drawn correctly. It appears that the TF2 and
> the TGraph2D each have their own set of axes which are scaled
> differently, but only whichever is drawn first gets displayed. The
> corresponding thing in 2D works just fine:
>
> {
> TF1 aline("aline", "1+2*x", -10, 10);
>
> TGraph somedata;
> somedata.SetPoint(0, 0, 1); // should be on line
> somedata.SetPoint(1, -1, -1); // ditto
> somedata.SetPoint(2, 3, 7); // ditto
> somedata.SetPoint(3, 2, 1); // should be *off* the line
>
> somedata.Draw("AP*");
> aline.Draw("SAME");
> }
>
> I have found no way to get the TF2 and TGraph2D to display properly
> together. Is there a way? (One that doesn't involve kludgy fine
> tuning on a plot by plot basis, I mean!)
>
> I could not find anywhere in the documentation that suggests that this
> shouldn't work or that it requires anything more complicated than in
> the lower-dimensional case. It would be nice if something could be
> added to this effect.
>
> Thanks,
> Matthew
Received on Fri Aug 17 2007 - 21:54:29 CEST
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