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MathGroup Archive 2005

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Re: Matrices and Conditional Statements

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61456] Re: Matrices and Conditional Statements
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Wed, 19 Oct 2005 02:17:10 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 10/18/05 at 2:44 AM, gregory.lypny at videotron.ca (Gregory Lypny)
wrote:

>If I have an n x m array called X, how can I create another  
>array, Y, whose rows are those rows in X whose 8th column contains
>the word "red" and whose 11th column is a number greater than 9?

Y = Select[X, StringMatchQ[#[[8]], "red"] && #[[11]]>9&]

Here, I am assuming the word "red" in the array is a string. If instead it is a symbol then

Y = Select[X, #[[8]] == red && #[[11]]>9&]
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