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MathGroup Archive 1999

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Re: easiest way to sort a list?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18326] Re: [mg18308] easiest way to sort a list?
  • From: "David Park" <djmp at earthlink.net>
  • Date: Sat, 26 Jun 1999 19:08:04 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Peter Wang wrote:

>Hi everyone,
>
>Here's my question:  Suppose you have a list of integers, not all distinct,
>say
>      {1, 5, 3, 5, 10, 10, 1},
>
>and you want to obtain the list
>
>      {1, 5, 3, 10}
>


This rule should do it, although I am not certain about efficiency. Those are triple
and double "blanks" in the rule.

rule = {a___, b__, c___, b__, e___} -> {a, b, c, e}

{1, 5, 3, 5, 10, 10, 1} //. rule
{1, 5, 3, 10}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/







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