Hi Martin,
Could you send me a file with your TProfile2D and also clarify
which version of Root?
Rene Brun
On Wed, 9
Apr 2003, Martin Schroedter wrote:
> Hello,
>
> I am reasonably sure that the fitting of 2-d function in TProfile2D
> does not work correctly. The fit is wrong and the combined plot that is
> automatically produced is a black-white 2-d scatter plot. All further
> calls to hprof2d->Draw("cont") produce black and white 2-d scatter
> plots.
>
> In general, how does one go about doing multidimensional fitting in
> ROOT?
>
> Thank you,
> Martin
>
> hprof2d = new TProfile2D("hprof2d","Width ",40,2,6,40,0,1,-1,2);
> tree->Draw("energy:width:size>>hprof2d");
> TF2 *func2 = new TF2("func2",fitf2d,2,6,0,1,3);
> func2->SetParameters(-2,.7,.1);
> hprof2d->Fit("func2","r");
>
> Double_t fitf2d(Double_t *x, Double_t *par)
> { return par[0]+par[1]*x[0] + par[2]*x[1]; }
>
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