Re: [Rd] S4 dispatch for .DollarNames (utils)

From: Claudia Beleites <>
Date: Sun, 30 May 2010 17:08:28 +0200

Dear all,

thank your for this discussion - I had been wondering how to get the completion with my S4 class, but it didn't bother me enough to dig into things.

> The workaround/hack that *does* work now, I believe, is to insert a
> dummy S3 class into the mix and define the S3 .DollarNames method for it.
> Example:
> > setOldClass("foo3")
> > .DollarNames.foo3 <- function(x, pattern)"bar"

My question here is: what is the dummy class needed for?

I have a few S3 methods for my S4 class (rbind.hyperSpec, cbind.hyperSpec, and now .DollarNames.hyperSpec). They seem to work just fine without first setting up a dummy S3 class that is then used in the contains of the S4 definition. Any pitfalls with that?


Claudia Beleites
Dipartimento dei Materiali e delle Risorse Naturali
UniversitÓ degli Studi di Trieste
Via Alfonso Valerio 6/a
I-34127 Trieste

phone: +39 0 40 5 58-37 68

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