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MathGroup Archive 2004

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Re: Counting Runs

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51923] Re: [mg51890] Counting Runs
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 5 Nov 2004 02:17:17 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

v={1,1,1,-1,1,1,1,1,1,-1,-1,-1,-1,1};

Length/@Split@Sort@Cases[Split[v], x_List:>x[[1]]]

{2,3}

Length/@Split@Sort[v//.{s___,x_,x_,e___}:>{s,x,e}]

{2,3}


Bob Hanlon

> 
> From: Gregory Lypny <gregory.lypny at videotron.ca>
To: mathgroup at smc.vnet.net
> Date: 2004/11/04 Thu AM 01:50:22 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg51923] [mg51890] Counting Runs
> 
> 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
> 
> 


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