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MathGroup Archive 2006

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Re: Count Function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65507] Re: [mg65501] Count Function
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Thu, 6 Apr 2006 06:51:48 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

 Hi Gregory,

> 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.

Try select ...

If 
	data = Random[Integer, {-10, 10}] & /@ Range[32]
Then

	a = Select[data, (# > -9) &]
	b = Select[data, (# ? -9) &]

And 

	SameQ[32, Length@a + Length@b]

Regards,

Dave.


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