Message-ID: <6e9bb1ed91068f2ef02f2b705c0fd05f.squirrel@webmail.andrew.cmu.edu>
Date: 2009-11-16T19:42:37Z
From: Hao Cen
Subject: extracting the last row of each group in a data frame
Hi,
I would like to extract the last row of each group in a data frame.
The data frame is as follows
Name Value
A 1
A 2
A 3
B 4
B 8
C 2
D 3
I would like to get a data frame as
Name Value
A 3
B 8
C 2
D 3
Thank you for your suggestions in advance
Jeff