Re: Pattern Matching in Lists
- To: mathgroup at smc.vnet.net
- Subject: [mg35582] Re: Pattern Matching in Lists
- From: Mark Westwood <MarkCWestwood at compuserve.com>
- Date: Fri, 19 Jul 2002 06:09:50 -0400 (EDT)
- References: <ah5qce$59o$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Anthony
It's not elegant but the following seems to solve your immediate
problem:
Count[Partition[w, 2, 1], {1, 0}]
Like you, I think that there must be a neater solution using Count, but
it's a bit early here for me to figure it out.
Regards
Mark Westwood
Anthony Mendes wrote:
>
> 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