# intersect for multiple vectors in R

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a <- c(1,3,5,7,9) b <- c(3,6,8,9,10) c <- c(2,3,4,5,7,9)

A straightforward way to do the job is:

intersect(intersect(a,b),c)

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

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

The Reduce function is part of funprog {base}, which includes

Reduce(f, x, init, right = FALSE, accumulate = FALSE) Filter(f, x) Find(f, x, right = FALSE, nomatch = NULL) Map(f, ...) Negate(f) Position(f, x, right = FALSE, nomatch = NA_integer_)

I will learn it and put notes here later.

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