On 11/1/2005 10:16 AM, Thomas Lumley wrote: > On Tue, 1 Nov 2005, Duncan Murdoch wrote: > >> The version I posted yesterday did indeed mess up when some arguments were >> unspecified. Here's a revision that seems to work in all the tests I can >> think of. I also added the SIMPLIFY and USE.NAMES args from mapply to it, >> and a sanity check to the args. >> >> I did notice and work around one buglet in mapply: if you choose not to >> vectorize any arguments, you don't get a call to the original function, >> mapply returns "list()". >> >> For example, >> >>> mapply(function(x) x^2, MoreArgs = list(x=2)) >> list() >> >> whereas I would think 4 is a more logical answer. >> > > I don't agree at all. The answer should be the length of the longest > vectorised argument, and it is.
I do agree that if I'd specified something like mapply(function(x) x^2, x=numeric(0)) then the answer (which is again list()) would be correct. But what is the length of the longest item in an empty set? I'd say it's undefined. Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
