MathGroup Archive 2004

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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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