Problem retrieving Fit Parameters when using Minos in TMinui

ROOT
1

Rooters,
I’ve a simple problem. I’m using TMinuit to fit a function. I call first Migrad and when the fit is complex also Minos. Minos manages to find a correct minimum and gives back correct errors. Unfortunately when I use the command gMinuit.GetParameter() the parameters which are reported there are not the best-fit ones but the ones (+1sigma or -1sigma) found by Minos during the error search.

Now what shall I do to retrieve the correct best-fit parameters ?
Thanks
Marco

2

Hi,

it should still return the best fit parameters. It could be that during MINOS a better minimum is found and then the new minimum values are returned.
To understand more your problem, I would need to have an example reproducing the problem or at least the full log of the Minuit run produced with the verbose option.

Best Regards
Lorenzo