[R] Rows not common in dataframes

arun smartpink111 at yahoo.com
Mon Sep 24 14:13:09 CEST 2012


Try this:

 Dataframe_A[!Dataframe_A[[1]] %in% Dataframe_B[[1]],] # Milan's code had ...B[[2]]
#  x        y
#1 3 16.27243
#2 4 15.41464
#5 3 14.70528

----- Original Message -----
From: Milan Bouchet-Valat <nalimilan at club.fr>
To: Chintanu <chintanu at gmail.com>
Cc: R help <r-help at r-project.org>
Sent: Monday, September 24, 2012 3:30 AM
Subject: Re: [R] Rows not common in dataframes

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

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