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)
• 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

```

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