R help - Apr 2005 - Is this a bug in R?

Dear all,

I am trying to fit a nonlinear model with a autocorrelation term, but everytime
I type in the command, I got an error message from Winwows and R closes itself.
The command line is as follows:

mod1<-nlme(V~A*exp(-B*A.O)*Vac.t.1.,data,fixed=A+B~1,random=A+B~1|ORDINAL,+
correlation=corCAR1(0.3179,~A.O|ORDINAL,TRUE),start=c(A=1.2,B=0.2))

I have already fitted this model allowing Phi to vary while optimizing, and it
was fine, but as soon as I try to keep it fixed (argument "TRUE"), I
simply can't

I don't get any error message from R, just a Windows error seying something
like "R for windows GUI front-end has detected a problem and has to
close". And that?s it, R is over!

I don't know if I am doing anything wrong, or if it has to be with my system
(I have Windows XP Pro), but it looks like a bug in R.

Do you know anything else about this. Thank you very much,

Antonio

You are in fact using the contributed package 'nlme', not just R.

Please read both the section on BUGS in the FAQ and the posting guide, and 
send a reproducible example to the nlme maintainer.

One thing the posting guide asks for is a useful subject line.  Something 
like

 	`A crash when using nlme'.

On Thu, 28 Apr 2005, Revilla,AJ  (pgt) wrote:
> Dear all,
>
> I am trying to fit a nonlinear model with a autocorrelation term, but
everytime I type in the command, I got an error message from Winwows and R
closes itself.
> The command line is as follows:
>
>
mod1<-nlme(V~A*exp(-B*A.O)*Vac.t.1.,data,fixed=A+B~1,random=A+B~1|ORDINAL,+
> correlation=corCAR1(0.3179,~A.O|ORDINAL,TRUE),start=c(A=1.2,B=0.2))
>
> I have already fitted this model allowing Phi to vary while optimizing, and
it was fine, but as soon as I try to keep it fixed (argument "TRUE"),
I simply can't
>
> I don't get any error message from R, just a Windows error seying
something like "R for windows GUI front-end has detected a problem and has
to close". And that?s it, R is over!
>
> I don't know if I am doing anything wrong, or if it has to be with my
system (I have Windows XP Pro), but it looks like a bug in R.
>
> Do you know anything else about this. Thank you very much,
>
> Antonio
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595