Check out ?match, ?"%in%"
x <- c(1,2,3,4)
y <- c(1,2,4)
match(y,x)
[1] 1 2 4
--Adam
On Mon, 8 Sep 2008, Andrew Barr wrote:
Hi all,
I want to get the index numbers of all elements of a vector which match any
of a long series of possible values. Say x <- c(1,2,3,4) and I want to know
which values are equal to 1, 2 or 4. I could do
which(x == 1 | x==2 | x==4)
[1] 1 2 4
This gets really ugly though, when the list of values of interest is really
long. Is there a nicer way to do this? Something akin to the MySQL
construction in(), as in
#MySQL script example
Select * from table where parameter in(x,y,z);
Thanks!
--
W. Andrew Barr
Biological Anthropology
University of Texas at Austin
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