Fix Parameter with ROOT::Fit::FitConfig

[Mary_Queen_of_Scots]

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

[moneta]

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

[Mary_Queen_of_Scots]

ah perfect! Thank you a lot!