Message-ID: <317737de0911161152w1b3d39c9pfeb9b94d0ce06fc0@mail.gmail.com>
Date: 2009-11-16T19:52:13Z
From: Jorge Ivan Velez
Subject: extracting the last row of each group in a data frame
In-Reply-To: <6e9bb1ed91068f2ef02f2b705c0fd05f.squirrel@webmail.andrew.cmu.edu>
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