Re: TMinuit and Asymmetric Errors

Hello,

 TMinuit has two index lists for the parameters, an external one, which is order according how they are defined and an internal one, where fix and constants parameters are removed. The user normally interact with the external lists. But you are accessing an internal array, fErp, which is ordered according to the internal list. You can use instead TMinuit::mnerrs where you can pass the external index

 Best Regards

 Lorenzo  

On Mar 11, 2010, at 7:03 PM, Arafat Gabareen Mokhtar wrote:

> Dear Rooters,
> In my fitter, I call TMinuit and extract the asymmetric Minos errors
> associated with the different parameters. If one of the parameters is
> fixed in the fit, I notice that the index of the parameters is not
> correct. Here is an example:
> Fit parameters: a, b, and c, with index: 0, 1, 2
> if I fix "b" in the fit, then TMinuit->fErp[1] is corresponding to the
> negative Minos error associated with the parameter "c".
> Have you seen this before?
> Thanks,
> Arafat
>
Received on Fri Mar 12 2010 - 13:09:05 CET