Plot confidence intervals of fitting

ROOT
1

Hi,
I am posting a problem of confidence intervals of fitting because I think it might be a potential bug in ROOT.

I have a function, for example, with 3 free parameters and 1 variable, I can plot confidence intervals of fitting by something like:

(TVirtualFitter::GetFitter())->GetConfidenceIntervals(gint);

However, if I fix one parameter of the function by FixParamter(), then the confidence intervals of the fitting function can not be plotted. I attached an example here. Why?

Cheers,
Zhiyi.
test_confidenceIntervals.C (2.38 KB)

2

Thanks for reporting this problem.
Currently fixed parameters are not taken into account.
We will “fix” the problem.

Rene