[R] Rows not common in dataframes

[Milan Bouchet-Valat]

Le lundi 24 septembre 2012 à 13:22 +1000, Chintanu a écrit :
> Hi,
> 
> I have two dataframes (Dataframe_A, Dataframe_B) with the same no. of
> columns. The first column of both the dataframes contains unique names.
> I wish to have Dataframe_A with the rows that are NOT common to
> Dataframe_B.
So you just want to drop some rows from A? In that case, do:
Dataframe_A <- Dataframe_A[!Dataframe_A[[1]] %in% Dataframe_B[[2]],]

> With merge (), it is possible to get the common rows or to merge rows, but
> I am not quite sure how to do it in a simpler way. Any help would be much
> appreciated.
No need for merge, as all rows you need are already in A.


My two cents