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...atrix 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 [[alternative HTML version deleted]]