Re: Union - simple question

*To*: mathgroup at smc.vnet.net*Subject*: [mg49011] Re: [mg49009] Union - simple question*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Tue, 29 Jun 2004 04:49:38 -0400 (EDT)*References*: <200406280813.EAA04305@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On 28 Jun 2004, at 17:13, Steve Gray wrote: > 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. > > > SameTest not Sametest. Andrzej Kozlowski Chiba, Japan http://www.mimuw.edu.pl/~akoz/

**References**:**Union - simple question***From:*Steve Gray <stevebg@adelphia.net>