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MathGroup Archive 2004

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Union - simple question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49009] Union - simple question
  • From: Steve Gray <stevebg at adelphia.net>
  • Date: Mon, 28 Jun 2004 04:13:56 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

	I don't understand why Union here doesn't work. (Sort is ok.)
I want Union to eliminate list items where element [[1,2]] is
duplicated. In this case, the first and third are duplicated because
they both have '5' there.

      ts = {{{1,2,3},5}, {{3,8,7},6}, {{7,8,9},5}, {{1,2,3},7}};
Sort [ts, #1[[2]] < #2[[2]] &]
Union[ts, Sametest -> (#1[[2]] == #2[[2]]&)]

Any help will be appreciated.


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