Re: Count Function

*To*: mathgroup at smc.vnet.net*Subject*: [mg65520] Re: [mg65501] Count Function*From*: Gregory Lypny <gregory.lypny at videotron.ca>*Date*: Thu, 6 Apr 2006 06:52:02 -0400 (EDT)*References*: <200604051055.GAA21742@smc.vnet.net> <55DC5ED6-AB89-4A5A-B93F-694BAD259CF6@yale.edu>*Sender*: owner-wri-mathgroup at wolfram.com

Thanks János, That would be my natural inclination: to combine two functions, Length and Select in this case, to get a result that serves as a check of whatever I'm able to hammer out directly using something like Count. Regards, Gregory On Wed, Apr 5, 2006, at 12:47 PM, János wrote: > > 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>