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MathGroup Archive 2004

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Re: Counting Runs

  • To: mathgroup at
  • Subject: [mg51952] Re: [mg51890] Counting Runs
  • From: Yasvir Tesiram <yat at>
  • Date: Fri, 5 Nov 2004 02:19:13 -0500 (EST)
  • References: <>
  • Sender: owner-wri-mathgroup at

Take a look at the built in functions Split and Count.

On Nov 4, 2004, at 12:50 AM, Gregory Lypny 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

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