MathGroup Archive 2004

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Re: Counting Runs

On Nov 4, 2004, at 1:50 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.

I'm not sure about elegance but:


will do what you want.



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