Re: [R] Non-linear minimization

From: <christopher.m.turner_at_jpmorgan.com>
Date: Wed 09 Mar 2005 - 11:15:07 EST

After some experimentation, I have had very good luck with the rgenoud package. It handles box constraints well and for small problems its slow speed has not been much of a problem. It has worked for me on Windows, Macintosh, and Linux.

Chris
JPMorgan Asset Management

|---------+-------------------------------->

| | Sébastien Ballesteros|
| | <sebastien_ballestero|
| | s@yahoo.fr> |
| | Sent by: |
| | r-help-bounces@stat.m|
| | ath.ethz.ch |
| | |
| | |
| | 03/08/2005 08:23 AM |
| | |
|---------+--------------------------------> >-----------------------------------------------------------------------------------------------------------------------------| | | | To: r-help@stat.math.ethz.ch | | cc: | | Subject: [R] Non-linear minimization | >-----------------------------------------------------------------------------------------------------------------------------|

hello, I have got some trouble with R functions nlm(), nls() or optim() : I would like to fit 3 parameters which must stay in a precise interval. For exemple with nlm() :

fn<-function(p) sum((dN-estdata(p[1],p[2],p[3]))^2) out<-nlm(fn, p=c(4, 17, 5),
hessian=TRUE,print.level=2)

with estdata() a function which returns value to fit with dN (observed data vactor)

My problem is that only optim() allows me to set parameters interval with "L-BFGS-B" method but this one doesn't work in my case.

I have heard about nls2 package (www.inra.fr/bia) but it doesn't work on Windows.

Do you know any solutions

Thank's a lot for reading my post

Best regards

Sebastien
INA P-G ecology dpt



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Mar 09 11:30:58 2005

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