TFractionFitter GetFitter problem (returns Fit::Fitter, not TVirtualFitter)

ROOT
1

I just installed the binary for root v 6.10.00 on my macOS 10.11.4.

Now code using TFractionFitter leads to the following compilation error:
error: no member named ‘FixParameter’ in ‘ROOT::Fit::Fitter’

the offending line is fit->GetFitter()->FixParameter(i);
where ‘fit’ is a TFractionFitter*.
So it seems that this function returns a Fit::Fitter object, not a TVirtualFitter as before. Is that correct? If so, how can I fix a parameters in the TFractionFitter, fix parameters and ask for the number of free parameters? I guess this can be done using the FitConfig class but I had little luck finding documentation how to use this class.

2

Hi,

You can call the FitCOnfig class to fix the ipar-th parameter:

fit->GetFitter()->FitConfig().ParSettings(ipar).Fix();

The documentation of the Fitter class is available either rin Doxygen or in the User Guides

https://root.cern.ch/root/htmldoc/guides/users-guide/FittingHistograms.html#fit-configuration

Cheers

Lorenzo

3

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