[R] Gradient function for optim.

Katharine Mullen kate at few.vu.nl
Wed Feb 25 20:56:41 CET 2009

see the fmingr function in 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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