Fix Parameter with ROOT::Fit::FitConfig

Hey you all,

I have not much experience with fitting spectra via ROOT::Fit::FitConfig so my question is:
is there an easy way to fix one single parameter in analogy to “SetParamsSettings”?

Thanks :innocent:

I think @moneta can help.

Hi,
Yes you can easily fix a single parameter.
Let’s take as fitting example the tutorial combinedFit.C. There you have a line where a parameter is fixed, by calling:

// fix 5-th parameter
fitter.Config().ParSettings(4).Fix(); 

Lorenzo

ah perfect! Thank you a lot!

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