[R] A model package that uses S4 methods and name spaces?

[Douglas Bates]

rlee at fpcc.net wrote:
> I'd like to try and rewrite my package to take advantage of S4 methods and
> name spaces.  I am presuming that S4 methods and name spaces will help me
> write and maintain my package.
> 
> Can someone suggest a "model" package that uses best practices for mixing
> S3, S4 methods and name spaces?  Preferably a package with multiple R
> source files.

It doesn't mix S3 and S4 but the Matrix package is a large package based
on S4 that does show the use of S4 and a NAMESPACE.  On a smaller scale,
the lme4 package also uses S4 and a NAMESPACE.