nlme package dependencies?

"Cooke, Barry" <BCooke at exchange.cfl.forestry.ca> writes:

The following nlme example, from help(Variogram.gls), does not work on my
system.  

data(BodyWeight)
fm1 <- gls(weight ~ Time * Diet, BodyWeight)
Variogram(fm1, form = ~ Time | Rat)[1:10,]

Error in FUN(X[[1]], ...) : unused argument(s) (method ...)

It looks like I might not have loaded a necessary package.  I did load nls
and lattice (the latter not actually being listed in the package description
as a dependency).  

Lattice was not listed as a dependency for nlme because both lattice
and grid were classed as "in development" until R-1.4.1.  In
R-1.4.1 nlme is a recommended package but lattice and grid are not.
Having nlme depend on lattice would contradict this classification.

I hope we will change lattice and grid to be recommended packages in
R-1.5.0 and then we can list a dependency of nlme on lattice.

I checked the R-help archives thoroughly and also
examined the library nlme scripts.  The chapter 5 Wheat2 example from
Pinheiro & Bates (2000) didn't work either:

library( nlme )
library( lattice )
data( Wheat2 )
fm1Wheat2 <- gls( yield ~ variety - 1, Wheat2 )
Variogram( fm1Wheat2, form = ~ latitude + longitude )

Error in as.data.frame.default(x[[i]], optional = TRUE) : 
        can't coerce array into a data.frame

Looks like an error in nlme.  Usually these are the result of code
written originally for S-PLUS being incompletely ported by me to R.
I'll look into it.
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