Message-ID: <20916243.post@talk.nabble.com>
Date: 2008-12-09T14:57:44Z
From: ppaarrkk
Subject: Selecting rows that are the same in separate data frames
I want to compare two matrices or data frames and select or get an index for
those rows which are the same in both. I have tried the following :
a = matrix ( 1:10, ncol = 2 )
a
b = matrix ( c ( 2,3,4,7,8,9 ), ncol = 2 )
b
a[a==b]
a = as.data.frame ( matrix ( 1:10, ncol = 2 ) )
a
b = as.data.frame ( matrix ( c ( 2,3,4,7,8,9 ), ncol = 2 ) )
b
a[a==b]
Any ideas please.
Thanks.
Simon Parker
Imperial College
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