How to find common elements from multiple vectors

Question

Can anyone tell me how to find the common elements from multiple vectors   a  lt - c 1 3 5 7 9  b  lt - c 3 6 8 9 10  c  lt - c 2 3 4 5 7 9    I want to get the common elements from the above vectors  ex  3 and 9

User · Accepted Answer

There might be a cleverer way to go about this, but

intersect(intersect(a,b),c)

will do the job.

EDIT: More cleverly, and more conveniently if you have a lot of arguments:

Reduce(intersect, list(a,b,c))

User · Answer

intersect all  lt - function a b         all data  lt - c a b        require plyr    count data lt - length list a b         freq dist  lt - count all data    intersect data  lt - freq dist which freq dist freq  count data   x     intersect data     intersect all a b c    UPDATE EDIT A simpler code  intersect all  lt - function a b         Reduce intersect  list a b          intersect all a b c

User · Answer

A good answer already  but there are a couple of other ways to do this   unique c c in a a in b      or   tst  lt - c unique a  unique b  unique c   tst  lt - tst duplicated tst   tst duplicated tst     You can obviously omit the unique calls if you know that there are no repeated values within a  b or c

[r] How to find common elements from multiple vectors?

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