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MathGroup Archive 2004

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Re: Union - simple question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49015] Re: [mg49009] Union - simple question
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 29 Jun 2004 04:49:41 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Use correct spelling of SameTest and it should work.

Bob Hanlon

> 
> From: Steve Gray <stevebg at adelphia.net>
To: mathgroup at smc.vnet.net
> Date: 2004/06/28 Mon AM 04:13:56 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg49015] [mg49009] Union - simple question
> 
> 	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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