[Rd] Creating an S3 method when the generic function is defined in another (imported) package

[Achim Zeileis]

On Fri, 14 May 2010, Arne Henningsen wrote:

> Hi,
>
> In one of my packages (maxLik), I would like to add an S3 method,
> where the generic function (estfun) is defined in another package
> (sandwich). Everything works fine if my package "Depends" on the other
> package and I import the generic function "estfun" from the "sandwich"
> package and define the new method in the NAMESPACE file. However, I
> prefer not to load the entire other package just to use a single
> generic function from it. Therefore, I replaced "Depends" by "Imports"
> in the DESCRIPTION file and (re-)exported "estfun" in the NAMESPACE
> file. Now "R CMD check" warns about the undocumented code object
> "estfun" but I do not want to include a duplicate of the documentation
> of "estfun". Do you know a better solution?

I probably wouldn't re-export the estfun() generic. People will probably 
load "sandwich" anyway before calling estfun(), in particular if they want 
to compute the sandwich() covariance matrix.

hth,
Z

> Thanks a lot,
> Arne
>
> -- 
> Arne Henningsen
> http://www.arne-henningsen.name
>
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