Re: Matrices and Conditional Statements

• To: mathgroup at smc.vnet.net
• Subject: [mg61457] Re: Matrices and Conditional Statements
• From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
• Date: Wed, 19 Oct 2005 02:17:13 -0400 (EDT)
• References: <dj26om\$bcr\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Use a pattern to filter the matrix:

p={_,_,_,_,_,_,_,"red",_,_,_?(#>9&),___};

You then have:

MatchQ[{1,2,3,4,5,6,7,"red",9,10,9.01},p]

True

but:

MatchQ[{1,2,3,4,5,6,7,"red",9,10,8.99},p]

False

So this should do what you want:

Cases[X, p]

Steve Luttrell

"Gregory Lypny" <gregory.lypny at videotron.ca> wrote in message
news:dj26om\$bcr\$1 at smc.vnet.net...
> Hello Everyone,
>
>     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?
>
>     Regards,
>
>         Greg
>

```

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