unvectorized option for outer()
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