Re: [Rd] Reduce: extra args wishlist?

From: Ben Bolker <>
Date: Wed, 10 Jun 2009 10:06:07 -0400

Prof Brian Ripley wrote:
> I think the idiom of the languages from which this comes would indeed
> to be use an anonymous function, and in R to use ... and no braces, as
> in
> Reduce(function(...) merge(..., by="state", all=TRUE), z)
> But that's not the (ony) R idiom, so I am happy to add a ... argument
> to Reduce. Unfortunately the patch below is backwards (you have diffs
> from old to new in 'patch' format), and we do need to patch the
> documentation (which gets a bit ugly as ... has a different meaning
> for another function on the Reduce help page). I think I have sorted
> these out, and will commit to R-devel shortly.

  Hmm. Thanks. Sorry about the patch glitch. (On my Ubuntu system, patch has a -R flag that would seem to take care of that ...)

  I accepted Kurt's explanation. I'm curious what the protocol is when R-core members differ? (I would have guessed that conservatism would rule, or the opinion of the original author of the functions (I don't know who contributed Reduce et al.), but perhaps Kurt doesn't have strong feelings about this ...


Ben Bolker
Associate professor, Biology Dep't, Univ. of Florida /
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