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replacing values in a data frame

To: <s-news@lists.biostat.wustl.edu>
Subject: replacing values in a data frame
From: "Khan, Sohail" <khan@cshl.edu>
Date: Mon, 21 Aug 2006 16:22:36 -0400
Thread-index: AcbFX4rHjWI/7e/VTiasRyNIAPaPIg==
Thread-topic: replacing values in a data frame
Dear list,

I have a large data frame with several numerical columns, I would like to 
replace all the values < 20 to NAs.
How could I do this?  Thanks for your suggestions.

Sohail 

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