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MathGroup Archive 2004

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Re: Counting Runs

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51928] Re: [mg51890] Counting Runs
  • From: DrBob <drbob at bigfoot.com>
  • Date: Fri, 5 Nov 2004 02:17:29 -0500 (EST)
  • References: <200411040650.BAA18131@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

data={1,1,1,-1,1,1,1,1,1,-1,-1,-1,-1,1};
Count[Split@data,{#,___},{1}]&/@Union@data
{#,Count[Split@data,{#,___},{1}]}&/@Union@data

{2,3}
{{-1,2},{1,3}}

Bobby

On Thu, 4 Nov 2004 01:50:22 -0500 (EST), Gregory Lypny <gregory.lypny at videotron.ca> wrote:

>
>
> Looking for an elegant way to count runs to numbers in a series.
> Suppose I have a list of ones and negative ones such as
> 	v={1,1,1,-1,1,1,1,1,1,-1,-1,-1,-1,1}.
> I'd like to create a function that counts the number of runs of 1s and
> -1s, which in this case is 3 and 2.
>
> 	Greg
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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