[R] nlminb doesn't converge and produce a warning

[Ravi Varadhan]

Hi,

It is indeed annoying that each optimization code has different names for the parameters that control the behavior of the algorithms.  This is one of the reasons that we have developed "optimx" - to unify the calling convention for the various algorithms.  You can call the optimization algorithm of your choice without having to worry about the names of the control parameters. 

Ravi.

-------------------------------------------------------
Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology School of Medicine Johns Hopkins University

Ph. (410) 502-2619
email: rvaradhan at jhmi.edu

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Karl Ove Hufthammer
Sent: Friday, January 21, 2011 6:48 AM
To: r-help at stat.math.ethz.ch
Subject: Re: [R] nlminb doesn't converge and produce a warning

kamel gaanoun wrote:

> I use nlminb like this :
> res1<-nlminb(vect, V, lower=c(rep(0.01, 12), rep(0.01, 3), rep(-Inf,
> n-15)), upper=c(rep(Inf, 12), rep(0.99, 3), rep(Inf, n-15)), control =
> list(maxit=1000) )
> 
> and that's the result :
> 
> Message d'avis :
> In nlminb(vect, V, lower = c(rep(0.01, 12), rep(0.01, 3), rep(-Inf,  :
> unrecognized control element(s) named `maxit' ignored

Just increase the maximum number of iterations. Which you tried to do, but 
didn’t succeed in, as the above warnings shows. The argument is called 
‘iter.max’, not ‘max.iter’.

-- 
Karl Ove Hufthammer

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