Dear Daren,

Try this:

tapply(t[,"value"],t[,"id"],mean)

HTH,

Jorge



On Tue, Jun 10, 2008 at 11:37 AM, Daren Tan <daren76@hotmail.com> wrote:

>
> Hi,
>
> How do I collapse (average in the simplest case) the values of those
> duplicated ids (i.e., 2, 5, 6, 9) to give a table of unique ids ?
>
> t <- cbind(id=c(1:10, 2,5,6,9), value=rnorm(14))
>
>
>
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