Hi Til, Eddy,
Fitting and access to the fit results is described in the Users Guide.
I have added more information also to:
http://root.cern.ch/root/htmldoc/TH1.html#TH1:Fit
http://root.cern.ch/root/htmldoc/TGraph.html#TGraph:Fit
Rene Brun
Eddy Offermann wrote:
>
> Til,
>
> Something along the following lines:
>
> histo->Fit("myfunc");
> TF1 *f = histo->GetFunction("myfunc");
> Double_t chi2 = f->GetChisquare();
>
> >
> >
> > Hi,
> >
> > doing a simple fit with histo->fit() I would like to access the value of
> > the chi2 afterwards. If I have understood right this is just the value
> > printed onto the screen as FCN=... in the case of the default chi2
> > fit, so in principle this piece of information is there. Is there any
> > method to access it or do I have to calculate it on my own from the data
> > points and the fit params?
> >
> > Thanks in advance,
> >
> > Til
> >
> >
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