[R] Removing rows w/ smaller value from data frame

[ramoss]

Hello,

I have a column called max_date in my data frame and I only want to keep the
bigger values for the same activity.  How can I do that?

data frame:

activity    max_dt
A            2013-03-05
B             2013-03-28
A             2013-03-28
C             2013-03-28
B             2013-03-01

Thank you for your help



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