Re: Pattern Matching in Lists

• To: mathgroup at smc.vnet.net
• Subject: [mg35556] Re: Pattern Matching in Lists
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Fri, 19 Jul 2002 06:07:57 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <ah5qce\$59o\$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

Count10Seqence[w_List] :=
Length[Cases[First /@ Split[w] //. { {a___, 1, 0, b__} :> {a, {1, 0},
b},
{a__, 1, 0} :> {a, {1, 0}}}, _List]]

Regards
Jens

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

```

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