[R] Non-linear minimization

From: Sébastien Ballesteros <sebastien_ballesteros_at_yahoo.fr>
Date: Wed 09 Mar 2005 - 00:23:32 EST


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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