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MathGroup Archive 2004

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Re: how to delete duplicate items in the same list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg45571] Re: how to delete duplicate items in the same list
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Wed, 14 Jan 2004 01:26:27 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 1/13/04 at 4:03 AM, J.A.Solomon at city.ac.uk (Joshua A. Solomon) wrote:

> On 10/1/04 5:18 am, in article bto1uf$2ka$1 at smc.vnet.net, "Sabrina"
> <hxs61 at case.edu> wrote:

> > I can't find a way to make sure all items in the same list are unique. Can
> > anybody help me out? Thanks a lot!

> a = {1, 2, 3}; b = {1, 2, 3, 3};
> Union[a]==a
> True
> Union[b]==b
> False

This fails since

c = Reverse@a;
Union@c==c
False
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