[R] Union of columns of two matrices I was posed the following problem/teaser:

given two matrices, come up with an "elegant" (=fast & short) function that
returns a matrix with all and only the non-duplicated columns of both
matrices; the column order does not matter. In essence, a matrix equivalent
of union(x,y), where x and y are vectors. I could not come with anything
nice. Any ideas?

Giuseppe

-- 
Giuseppe A. Paleologo :: Email: paleologo@gmail.com :: AOL: gappy3000 ::
Skype :: gappy3000 :: Gtalk: paleologo :: Mobile: 917.331.3497
fact: 2^32,582,657-1 is a prime

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