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MathGroup Archive 2006

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Re: Extract values and multilpicities from list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64880] Re: Extract values and multilpicities from list
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Mon, 6 Mar 2006 05:01:42 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 3/5/06 at 3:19 AM, weh at snafu.de (Dr. Wolfgang Hintze) wrote:

>Given a list of integers which may repeat, e.g.

>lstIn = {2,3,4,4,2,1,1,5,4}

>provide a list of different values and their respective
>multiplicities, in the example,

>LstOut= {{1,2},{2,2},{3,1},{4,3},{5,1}}

>Who finds the shortest function doing this task in general?

Shortest, as in least code?

How about

{First@#,Length@#}&/@Split[Sort@listin]
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