Re: [Rd] relist, an inverse operator to unlist

From: Andrew Clausen <clausen_at_econ.upenn.edu>
Date: Tue, 22 May 2007 07:51:54 -0400

Hi Seth,

On Mon, May 21, 2007 at 05:15:10PM -0700, Seth Falcon wrote:
> I will also add that the notion of a default argument on a generic
> function seems a bit odd to me. If an argument is available for
> dispatch, I just don't see what sense it makes to have a default. In
> those cases, the default should be handled by the method that has a
> signature with said argument matching the "missing" class.
>
> What often does make sense is to define a generic function where some
> argument are not available for dispatch. For example:
>
> setGeneric("foo", signature="flesh",
> function(flesh, skeleton=attr(flesh, "skeleton")
> standardGeneric("foo")))

That's an excellent suggestion. Thanks! However, I had to set the signature to c("numeric", "missing") rather than just "numeric".

I have uploaded a new version here:

        http://www.econ.upenn.edu/~clausen/computing/relist.R

Cheers,
Andrew



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