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

From: Seth Falcon <sfalcon_at_fhcrc.org>
Date: Wed, 23 May 2007 05:45:41 -0700

Andrew Clausen <clausen_at_econ.upenn.edu> writes:

> 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

I misunderstood. You aren't using S4 classes/methods at all and so I don't actually see how my comments could have been helpful in any way. relist seems like a really odd solution to me, but based on the discussion I guess it has its use cases.

Best,

+ seth

-- 
Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center
http://bioconductor.org

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