Message-ID: <20090302101717.QBW03.1733555.root@mp12>
Date: 2009-03-02T15:17:17Z
From: rkevinburton at charter.net
Subject: Gradient function for optim.
In-Reply-To: <Pine.GSO.4.56.0902252047110.1651@laurel.few.vu.nl>
Thank you. I saw the source. But I am not sure how to get from .Internal(optim(...)) to fmingr.
Kevin
---- Katharine Mullen <kate at few.vu.nl> wrote:
> see the fmingr function in src/main/optim.c
> (https://svn.r-project.org/R/trunk/src/main/optim.c)
>
> On Wed, 25 Feb 2009 rkevinburton at charter.net wrote:
>
> > I have read that when the gradient function is not supplied (is null)
> > then first order differencing is used to find the differential. I was
> > trying to track down this for my own information but I run into
> > .Internal(optim.....). I was not sure where to look next to see the
> > function that is automatically supplied for the gradient.
> >
> > Thank you.
> >
> > Kevin
> >
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> >