R help - Aug 2004 - correlation structures in NLME

I am using the latest version of R on a Windows machine and get the
following error when I try to initialize a correlation structure with
the function corAR1 in NLME. This example is taken from the book of
Pinheiro and Bates, so it should work. What is going wrong?
> library(nlme)
> data(Orthodont)
> cs1AR1 <- corAR1(0.8, form= ~1 | Subject)
> cs1AR1 <- initialize(cs1AR1, data = Orthodont)
Error in methodsPackageMetaName("C", name) : 
        The name of the object (e.g,. a class or generic function) to
find in the meta-data must be a single string (got a character vector of
length 2)
In addition: Warning message: 
the condition has length > 1 and only the first element will be used
in: if (!is.na(match(Class, .BasicClasses))) return(newBasic(Class,  


Thank you!

Michael Jerosch-Herold

On Thu, 12 Aug 2004, Michael Jerosch-Herold wrote:
> I am using the latest version of R on a Windows machine and get the
> following error when I try to initialize a correlation structure with
> the function corAR1 in NLME. This example is taken from the book of
> Pinheiro and Bates, so it should work. What is going wrong?
That book is about S(-PLUS), so there is no reason why it `should work' in
R.
> > library(nlme)
> > data(Orthodont)
> > cs1AR1 <- corAR1(0.8, form= ~1 | Subject)
> > cs1AR1 <- initialize(cs1AR1, data = Orthodont)
> Error in methodsPackageMetaName("C", name) : 
>         The name of the object (e.g,. a class or generic function) to
> find in the meta-data must be a single string (got a character vector of
> length 2)
> In addition: Warning message: 
> the condition has length > 1 and only the first element will be used
> in: if (!is.na(match(Class, .BasicClasses))) return(newBasic(Class,  
Try
> find("initialize")
[1] "package:methods"

so that's not right.

Have you looked in the R scripts in package nlme?  I think it is
Initialize() in R.

-- 
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