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Message-ID: <2102849490.5133566.1457525383019.JavaMail.yahoo@mail.yahoo.com>
Date: 2016-03-09T12:09:43Z
From: carol white
Subject: group by rows

How is it possible to group rows of a matrix or a data frame by the same values of the first column?
1 14331 453452 653 3762 45

1 1433,453452 45, 653 376
Thanks 

Carol

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