[R] delete rows whose sum is X

From: purna <mijony_at_live.se>
Date: Fri, 04 Mar 2011 05:50:34 -0800 (PST)

Rnoob here.
I have a matrix of zeroes ond ones. I want to delete the rows whose sum of values is not =5, alternatively extract the rows who sum up to 5.  

Thank you/Mikael

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