[R] dataframe subset

From: Bernhard Baumgartner <bernhard.baumgartner_at_wiwi.uni-regensburg.de>
Date: Thu 09 Feb 2006 - 01:21:46 EST


I have a dataframe with a column, say "x" consisting of values, each value appearing different times, e.g.
x: 1,1,1,1,2,2,4,4,4,9,10,10,10,10,10 ... and a vector, including e.g.:
y: 2,9,10,...
I need a subset of the dataframe: all rows where x is equal to one of the values in y. Currently I use a loop for this, but because x and y are large this is very slow.
Is there any idea how to solve this problem faster? Thank you,
Bernhard



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