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Help! Delete Casses based on column

• To: mathgroup at smc.vnet.net
• Subject: [mg58296] Help! Delete Casses based on column
• From: tornado78 <tornado78 at hotmail.com>
• Date: Sun, 26 Jun 2005 01:33:58 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Any help would be apreciated 

I need to take a large numeric matrix and remove all the rows that have a value less than X in column N

Since its a large matrix im looking for an efficient algorithm.

thanks