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Memory usage - Extract vs Select

• To: mathgroup at smc.vnet.net
• Subject: [mg93189] Memory usage - Extract vs Select
• From: tomfabtastic at hotmail.com
• Date: Thu, 30 Oct 2008 02:03:38 -0500 (EST)

Hello,

Does anyone know what is the most memory efficient way to manipulate
large data sets (200,000 rows and 40 columns) ? I use extract, but
suspect Select may be more efficient.

Also, is there a way to tell how much memory is being used by a
mathematica command ?

Thanks,
Tom