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:
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?
test_confidenceIntervals.C (2.38 KB)