text_combined: dan davison davisonstatsoxacuk wed aug 06 2008 063243pm 0400 giuseppe paleologo wrote posed following problemteaser given two matrices come elegant fast short function returns matrix nonduplicated columns matrices column order matter essence matrix equivalent unionxy x vectors could come anything nice ideas unionmatrices functiona b u cbindab uduplicatedu margin2 obviously attempting deal issues identity columns containing real numbers dan giuseppe giuseppe paleologo email paleologogmailcom aol gappy3000 skype gappy3000 gtalk paleologo mobile 9173313497 fact 2325826571 prime alternative html version deleted ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code thu 07 aug 2008 113933 0100 r union columns two matrices