Re: Accesssing fit parameters and errors

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)).

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.

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

-Art

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On Mon, 5 Feb 2007, Roger Mason wrote:

> Hello Arthur,
>
> "Arthur E. Snyder" <snyder_at_slac.stanford.edu> writes:
>
> > It would be nice if root Print commands could take ostream as an argument
> > so one could print to a file, but that doesn't work. I use cut&paste
> > sometimes, but it I want to print a lot of 'em to files I have to use
> > GetParError or GetParErrors (returns an array [a]).
> >
> >
> >
> > [a] a pointer to the array fParErrors.
> > virtual Double_t *GetParErrors() const {return fParErrors;}
> >
>
> I don't understand what syntax one would use to fill an array from
> GetParErrors, but I can easily loop over GetParError.
>
> Thanks,
> Roger
>
>
Received on Tue Feb 06 2007 - 01:02:47 CET