Can this be an answer ?

which(v %in% names(table(v)[table(v)>1]))
[1] 2 5

Nael

On Wed, Oct 8, 2008 at 8:36 PM, liujb <liujulia7@yahoo.com> wrote:

>
> Dear R users,
>
> I have this vector that consists numeric numbers. Is there a command that
> detects the repeated numbers in a vector and returns the index of the
> repeated numbers (or the actual numbers)? For example, v <- c(3,4,5,7,4).
> The command would return me index 2 and 5 (or the repeated number, 4).
>
> Thank you very much,
> Julia
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