On May 20, 2010, at 5:58 PM, Jonathan wrote:
Hi all,
The ?intersect entry kindly points out that it discards duplicate
entries. I'm looking, however, to get the intersection while KEEPING
duplicate entries, and there are no instructions on how to
accomplish this
using intersect().
Does anybody have any idea how this might be done, or am I going to
need to
program something from scratch (something like ordering the vectors
and then
looping through them)?
ex:
a <- c(2,4,2,3)
b<-c(6,6,5,2,2,8,4)
intersect(a,b)
[1] 2 4
> b %in% a
[1] FALSE FALSE FALSE TRUE TRUE FALSE TRUE
# Now use logical indexing on "b"
> b[b %in% a]
[1] 2 2 4
I'd hope the answer to be 2 2 4.
Regards,
Jonathan
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