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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

• Follow-Ups:
  • Re: Extract values and multilpicities from list
    • From: "Carl K. Woll" <carlw@wolfram.com>
  • Re: Extract values and multilpicities from list
    • From: gardyloo <gardyloo@mail.wsu.edu>
  • Re: Extract values and multilpicities from list
    • From: Pratik Desai <pdesai1@umbc.edu>