Re: Counting Runs

*To*: mathgroup at smc.vnet.net*Subject*: [mg51960] Re: Counting Runs*From*: Peter Pein <petsie at arcor.de>*Date*: Fri, 5 Nov 2004 02:19:44 -0500 (EST)*References*: <cmclmu$i99$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

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 > Please forgive me. First I had another way to solve your problem in mind. Of course it's sufficient to define countruns[data_, items_] := Count[Split[data], {x__} /; x == #] & /@ items -- Peter Pein Berlin