Re: [Rd] Registered S3 methods not found: Documentation bug or anomaly in function update or ... ?

From: <groemping_at_bht-berlin.de>
Date: Wed, 04 Nov 2009 12:27:17 +0100

Ah, thanks, now I understand the mode of operation and will work on a more robust fix than exporting the functions.

Regards, Ulrike

> Well,
>
> > swiss.lm
>
> Call:
> lm.default(formula = Fertility ~ Education + Examination, data = swiss)
>
> That means the call is registered as lm.default and update calls that
> one (and it is hidden in your namespace.
>
> You can fix it on your side so that the call is registered as lm(.....)
> in the lm object.
>
> Anyway, I think it is a bit dangerous to redefine lm() the way you did it.
>
> Best wishes,
> Uwe
>
> Ulrike Grömping wrote:
> > Dear expeRts,
> >
> > I recently asked for help on an issue with S3 methods for lm. The issue
> > was (in DoE.base 0.9-4)
> > that function update from package stats would return an error whenever
> > DoE.base was loaded,
> > complaining that lm.default was not found
> > (e.g.
> > require(DoE.base)
> > swiss.lm <- lm(Fertility~Education+Examination, swiss)
> > upd.swiss.lm <- update(swiss.lm, .~.-Examination)
> > ).
> >
> > In version 0.9-4 of DoE.base, I had followed the recommendations of
> > Section 1.6.2 of "Writing R
> > extensions", exporting the generic function lm and registering the
> > methods (lm.design and lm.default)
> > with S3method but not separately exporting them in the namespace file.
> > Not having received help fast, I decided to try to explicitly export the
> > method functions
> > lm.design and lm.default. This did in fact remove the
> > issue with not finding lm.default when using function update, and I have
> > uploaded this fixed version
> > as 0.9-5.
> >
> > Is it generally advisable to also export the method functions (i.e.
> > should section
> > 1.6.2 of "Writing R extensions" be revised) ? Or is there an anomaly in
> > function update ? Or ...?
> > Explanations are appreciated.
> >
> > Thanks and regards, Ulrike
> >
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