Re: Count Function
- To: mathgroup at smc.vnet.net
- Subject: [mg65532] Re: [mg65501] Count Function
- From: bsyehuda at gmail.com
- Date: Thu, 6 Apr 2006 06:52:46 -0400 (EDT)
- References: <200604051055.GAA21742@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
The pattern matching capabilities of Mathematica will save your life many time. You just need to know how to ask this salvage So, you need a pattern represented by _ and you want that pattern to give true for some condition, so write an intrinsic function that will return True if the value is greater than, say, -9 #>-9& is the function Now, to make the pattern use that function you need to use ? and as a command with Count Count[X[[All,14]],_?(#>-9&)] Note that the & sign should be enclosed within the parentheses regards yehuda On 4/5/06, Gregory Lypny <gregory.lypny at videotron.ca> wrote: > > The syntax will be the death of me. > > Count[X[[All,14]], -9.] will tally how many elements in column 14 of > matrix X are equal to -9, but I can't for the life of me figure out > how to get how many are greater than -9. Any hint would be most > appreciated. > > Greg > > >
- References:
- Count Function
- From: Gregory Lypny <gregory.lypny@videotron.ca>
- Count Function