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MathGroup Archive 2006

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Extract values and multilpicities from list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64849] Extract values and multilpicities from list
  • From: "Dr. Wolfgang Hintze" <weh at snafu.de>
  • Date: Sun, 5 Mar 2006 03:19:20 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

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?

Thanks.

Best regards,
Wolfgang


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