Re: Counting list elements above/below a given value
- To: mathgroup at smc.vnet.net
- Subject: [mg17263] Re: Counting list elements above/below a given value
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 30 Apr 1999 02:34:46 -0400
- Organization: Universitaet Leipzig
- References: <7g0qv1$drj@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi Bill, Count[] need a Pattern[] as its second argument and Count[Flatten[listname], a_ /; a<value] will work as expected. Hope that helps Jens "W.W. Sampson" wrote: > > I wish to count the number of elements within a list above > a given value. I can do this using the following: > > Length[Select[Flatten[listname], value > #1&]] > > However, my list is a 280 x 280 matrix and consequently > this takes a while to evaluate. My guess is that there > must be something more efficient. I've tried: > > Count[listname, value > #1&] > > but the output given is 0, which I know to be incorrect. > > Any ideas appreciated. > > Bill