Re: Counting Runs
- To: mathgroup at smc.vnet.net
- Subject: [mg51917] Re: [mg51890] Counting Runs
- From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
- Date: Fri, 5 Nov 2004 02:17:09 -0500 (EST)
- References: <200411040650.BAA18131@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On 4 Nov 2004, at 15:50, 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.
>
> Greg
>
>
Here is one way:
v = {1, 1, 1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1};
With[{u=Split[v]},{Count[u,{Repeated[1]}],Count[u,{Repeated[-1]}]}]
{3,2}
Andrzej Kozlowski
Chiba, Japan
http://www.akikoz.net/~andrzej/
http://www.mimuw.edu.pl/~akoz/
- References:
- Counting Runs
- From: Gregory Lypny <gregory.lypny@videotron.ca>
- Counting Runs