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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