[R] Creatiing an R package for solving nonlinear system of equations was: RE: finding roots of multivariate equation

[Ravi Varadhan]

Hi All,

Replying to this and numerous other requests in the past has made me realize
that a nonlinear solver is very much needed for R users.  I have
successfully used a nonlinear solver based on the spectral gradient method,
in FORTRAN.  I can readily translate that to R and make it available as an R
function, but what I would really like to do is to make that into a package.
I can provide the R function and several test examples.  But I am not good
at creating a good/reliable package.  So, it would be ideal if one of the R
gurus is interested in collaborating with me on this project.  Any one
interested?

Ravi.
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Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology 

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan at jhmi.edu

Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html

 

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-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Bill Shipley
Sent: Wednesday, June 20, 2007 1:37 PM
To: r-help at stat.math.ethz.ch
Subject: [R] finding roots of multivariate equation

Hello,
I want to find the roots of an equation in two variables.  I am aware of the
uniroot function, which can do this for a function with a single variable
(as I
understand it...) but cannot find a function that does this for an equation
with more than one variable.  I am looking for something implementing
similar
to a Newton-Raphson algorithm.
Thanks.

-- 
Bill Shipley
North American Editor for Annals of Botany
Subject Editor for Ecology
Département de biologie
Université de Sherbrooke
Sherbrooke (Québec) J1K 2R9
Canada

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