I appologize for the lack of information in my previous mail, but it is my
first one.
Yes I red -in part- the Port documentation to learn what does the message
X-convergence (3) mean.
so this is my nlminb and the results :
res1<-nlminb(parametres[,3], V, lower=c(rep(0.01, 18), rep(0.01, 3),
rep(-Inf, 6)), upper=c(rep(Inf, 18), rep(0.99, 3), rep(Inf, 6)), control =
list(maxit=1000) )
Results : > res1
$par
[1] 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000
[8] 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000
[15] 1.0000000 1.0000000 1.0000000 1.0000000 0.6899225 0.7993528 0.6480687
[22] 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000
$objective
[1] Inf
$convergence
[1] 0
$message
[1] "X-convergence (3)"
$iterations
[1] 1
$evaluations
function gradient
2 27
So as you see, it stops after just one iteration but it is converging.
Thanks
2010/12/15 Jonathan P Daily
> How are we supposed to help you if we have no idea how you are using it?
> Did you read the PORT documentation? Did you look at the control
> parameters outlined in the function help page? Often times for me a return
> of the initial conditions is an issue with either inappropriate tolerance
> or having variables on very different scales.
>
> Since you did not follow the posting guide (important part *'d below), my
> only suggestion is to ?nlminb
> --------------------------------------
> Jonathan P. Daily
> Technician - USGS Leetown Science Center
> 11649 Leetown Road
> Kearneysville WV, 25430
> (304) 724-4480
> "Is the room still a room when its empty? Does the room,
> the thing itself have purpose? Or do we, what's the word... imbue it."
> - Jubal Early, Firefly
>
> r-help-bounces@r-project.org wrote on 12/15/2010 08:53:39 AM:
>
> > [image removed]
> >
> > [R] Help about nlminb function
> >
> > kamel gaanoun
> >
> > to:
> >
> > r-help
> >
> > 12/15/2010 08:56 AM
> >
> > Sent by:
> >
> > r-help-bounces@r-project.org
> >
> > Hi Everyone,
> >
> > Can anyone help me resolve a problem that i'm having with nlminb. The
> > problem is that it stops after just one iteration and returns the same
> > values as "start" ones.
> >
> >
> > Thank you very much for your help.
> >
> >
> > Sincerely.
> >
> >
> > --
> > Kamel Gaanoun
> > (+33) (0)6.76.04.65.77
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
>
> ******************************************************************************
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ******************************************************************************
>
>
--
Kamel Gaanoun
(+33) (0)6.76.04.65.77
[[alternative HTML version deleted]]