Re: Counting Runs
- To: mathgroup at smc.vnet.net
- Subject: [mg51932] Re: [mg51890] Counting Runs
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Fri, 5 Nov 2004 02:17:49 -0500 (EST)
- References: <200411040650.BAA18131@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Nov 4, 2004, at 1:50 AM, 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.
>
I'm not sure about elegance but:
With[{lst=#[[1]]&/@Split[v]},{#,Count[lst,#]}&/@Union[lst]]
will do what you want.
Regards,
Ssezi
- References:
- Counting Runs
- From: Gregory Lypny <gregory.lypny@videotron.ca>
- Counting Runs