At least two ways

> (!is.na(match(X, Y)))
[1] FALSE  TRUE  TRUE FALSE  TRUE  TRUE
> X %in% Y
[1] FALSE  TRUE  TRUE FALSE  TRUE  TRUE
>
On Thu, Apr 5, 2012 at 3:32 PM, Julio Sergio <juliosergio@gmail.com> wrote:

> I have an ordered "set" of numbers, represented by a vector, say
>
>  > X <- c(10:13, 17,18)
>  > X
>  [1] 10 11 12 13 17 18
>
> then I have a "sub-set" of X, say
>
>  > Y <- c(11,12,17,18)
>
> Is there a simple way in R to have a logical vector (parallel to X)
> indicating
> what elements of X are in Y, i.e.,
>
>  > Inclusion
>  [1] FALSE TRUE TRUE FALSE TRUE TRUE
>
> I'm trying to avoid looping over both vectors to produce the tests. Do you
> have
> any comments on this?
>
> Thanks,
>
> --Sergio.
>
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