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.
>
>