[R] Subsetting subsets of data.frames

[Jeff08]

Hey Everyone,

I have been stumped by this all day.

Basically, I have a data.frame of multiple columns. Of concern are "id" &
"date"

For some reason, oftentimes there are duplicates of data with the same date.

I would like to remove the duplicates per different id (removing duplicate
dates for the entire data.frame would leave nothing since different id's all
have the same dates)

subset(x,!duplicated(x$date_)) works for just one ID, but i am having
trouble figuring out how to apply this to each subset of IDs (and retaining
the original data.frame structure) 
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