[R] subset data.frame with constraint of many values?
Dong-hyun Oh
r.arecibo at gmail.com
Wed Oct 24 11:44:25 CEST 2007
Dear UseRs,
Let us assume that I have data.frame named as dt.
dt is as follows:
a b c d
1 3 4 5
2 3 3 2
1 3 4 2
3 2 4 5
4 5 3 6
3 2 5 7
2 5 7 8
.....................
.....................
I want to subset dt with fileds a having 2 or 3 or 4, and I wrote
following code.
dt[dt$a == 2 | dt$a == 3 | dt$a == 4,]
Is there more efficient way for subset?
Thanks in advance.
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