Re: Count Function

*To*: mathgroup at smc.vnet.net*Subject*: [mg65519] Re: [mg65501] Count Function*From*: János <janos.lobb at yale.edu>*Date*: Thu, 6 Apr 2006 06:52:01 -0400 (EDT)*References*: <200604051055.GAA21742@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

On Apr 5, 2006, at 6:55 AM, Gregory Lypny 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 > Here is a newbie approach: In[1]:= xmat = Table[Table[ Random[Integer, {1, 100}], {i, 1, 20}], {j, 1, 30}] In[6]:= Length[Select[xmat[[All,14]], #1 > 9 & ]] Out[6]= 25 János ---------------------------------------------- Trying to argue with a politician is like lifting up the head of a corpse. (S. Lem: His Master Voice)

**References**:**Count Function***From:*Gregory Lypny <gregory.lypny@videotron.ca>