[R] Is there a function to test if all the elements in a vector are unique

[Peng Yu]

On Tue, Dec 1, 2009 at 1:40 AM, Karl Ove Hufthammer <karl at huftis.org> wrote:
> On Tue, 1 Dec 2009 14:48:04 +1100 Remko Duursma <remkoduursma at gmail.com>
> wrote:
>> any(duplicated(c(1,2,2)))
>
> or
> anyDuplicated(c(1,2,2))
> which is slightly more efficient.

I don't find anyDuplicated(). Which package is it from?