R devel - May 2010 - Creating an S3 method when the generic function is defined in another (imported) package

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?

Thanks a lot,
Arne

-- 
Arne Henningsen
http://www.arne-henningsen.name

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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