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