Re: Accesssing fit parameters and errors

From: Roger Mason <rmason_at_esd.mun.ca>
Date: Tue, 06 Feb 2007 08:32:37 -0330


Hello Art,

"Arthur E. Snyder" <snyder_at_slac.stanford.edu> writes:

> Well in c/c++ an array is just a pointer with a certain amount of space
> reseved beyond it. So GetParErrors give you a pointer (i.e. the array held
> by your TF1 object (fParErrors)).

I'm still at the stage with c++ where the pointer syntax, combined with object syntax, eludes me. Such was the case here.

> If you want a copy that will not go away when your TF1 goes away (to be
> safe) then I think you just have to copy it element by element, or use it
> to construct a TMatrix or TVector or something.

Well, as long as I have the TF1 in the root file I am OK because I can always extract the parameters and errors and dump the into a text file. Why do I need this? Because I always tabulate results in drafts of my publications just so the referees can tell me to toss 'em and keep the pictures.

> If your a fortran old-foggie like me this can be very confusing!
>

Fortran was my first programming language too. I'm just glad that root is'nt written in Java.

Thanks again,
Roger Received on Tue Feb 06 2007 - 13:03:05 CET

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