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MathGroup Archive 2002

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Pattern Matching in Lists

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35547] Pattern Matching in Lists
  • From: Anthony Mendes <amendes at zeno.ucsd.edu>
  • Date: Thu, 18 Jul 2002 03:06:59 -0400 (EDT)
  • Organization: Univ of Calif San Diego
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

Suppose w={1,1,1,0,0,1,0,1,0,0,1,0,0}.

How can I count the number of occurrences of a 1 in w immediately
followed by a 0 in w?

I have tried every incarnation of Count[] I can think of; for example,

Count[w,{___,1,0,___}]

does not seem to work.  In general, how can I count the number of
occurrences of a 1 followed by a 0 in a list of 1's and 0's?  Thank you!


-- 
Tony
_____________________
amendes at math.ucsd.edu



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