[R] Equivalent of 'first.var' or 'last.var' from SAS in R?
matthew.pettis at gmail.com
Thu Sep 25 21:00:15 CEST 2008
I want to sort a data frame by multiple columns and then take the
first record in each unique level of the "by" group I used to sort the
data frame. Does someone have an example of how to do this?
It is from the wellspring of our despair and the places that we are
broken that we come to repair the world.
-- Murray Waas
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