[R] nonlinear least square optimization

Prof Brian D Ripley ripley at stats.ox.ac.uk
Mon Dec 20 22:37:00 CET 1999

On Mon, 20 Dec 1999, Tony Q. Zhang wrote:

> Hi,
>    I've been using "nlregb" routine in splus3.4, but cannot find it here
> in R. Is it hidden in some library?

No. It is proprietary part of S-PLUS (not S). 

> Or there is a routine equivalent to it but with a different name? I'm
> planning to move part of my from S to R so that I can work comfortablely
> at home.  Any suggestion is highly appreciated.

At present your only choice is the general optimizer nlm. However,
general-purpose optimization routines often are as good as specialized
nls routines unless the solution is a near-perfect fit. (R's nls
uses nlm.)

We are working on other options (I have prototypes running) so you may see
more in a month or so.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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