Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: Counting Runs

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51924] Re: Re: [mg51890] Counting Runs
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 5 Nov 2004 02:17:18 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

One more example

Length/@Split@Sort[First/@Split[v]]


Bob Hanlon

> 
> From: Bob Hanlon <hanlonr at cox.net>
To: mathgroup at smc.vnet.net
> Date: 2004/11/04 Thu AM 06:21:27 EST
> To: Gregory Lypny <gregory.lypny at videotron.ca>, 
<mathgroup at smc.vnet.net>
> Subject: [mg51924] Re: [mg51890] Counting Runs
> 
> v={1,1,1,-1,1,1,1,1,1,-1,-1,-1,-1,1};
> 
> Length/@Split@Sort@Cases[Split[v], x_List:>x[[1]]]
> 
> {2,3}
> 
> Length/@Split@Sort[v//.{s___,x_,x_,e___}:>{s,x,e}]
> 
> {2,3}
> 
> 
> Bob Hanlon
> 
> > 
> > From: Gregory Lypny <gregory.lypny at videotron.ca>
To: mathgroup at smc.vnet.net
> > Date: 2004/11/04 Thu AM 01:50:22 EST
> > To: mathgroup at smc.vnet.net
> > Subject: [mg51924] [mg51890] Counting Runs
> > 
> > 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
> > 
> > 
> 

Bob Hanlon
Chantilly, VA


  • Prev by Date: Re: covariance, eigenvalues
  • Next by Date: Re: foreach loop
  • Previous by thread: Re: Counting Runs
  • Next by thread: Re: Counting Runs