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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: [mg64861] Re: Extract values and multilpicities from list
  • From: "Scout" <Scout at nodomain.com>
  • Date: Mon, 6 Mar 2006 05:01:05 -0500 (EST)
  • References: <due96k$ach$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Dr. Wolfgang Hintze" <weh at snafu.de>
> 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
>

Well,
an elegant and probably shortest function, using the Split[] command is:

    runLength[a_List] := {First[#], Length[#]} & /@ Split[Sort[a]];

Regards,
       ~Scout~


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