[R] setdiff for data.frames?

[Gabor Grothendieck]

Try this:

library(sqldf)
BODsub <- BOD[1:3,]
sqldf("select * from BOD except select * from BODsub")

For more see: http://sqldf.googlecode.com

On Thu, Mar 12, 2009 at 5:58 PM, Jason Rupert <jasonkrupert at yahoo.com> wrote:
>
> I have two data.frames.
>
> One is the subset of the other.  I need to determine what rows were removed from the superset data.frame to form the subset data.frame.
>
> I was hoping to turn up functionality similar to setdiff for data.frames, but did not have any luck.   It seems I need to find a function that performs the oposite as "merge".
>
>
>> dim(superset_dataframe)
> [1] 248  31
>> dim(subset_dataframe)
> [1] 214  31
>
> Thank you for any suggestions of functions that might exist that might help.
>
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