On Fri, Apr 3, 2009 at 8:43 AM, baptiste auguie <ba...@exeter.ac.uk> wrote:
> That makes sense, so I can do something like,
>
> count <- function(x){
> as.integer(unclass(table(x)))
> }
>
> count(d$user_id)
>
> ddply(d, .(user_id), transform, count = count(user_id))
>
>> user_id website time count
>> 1 20 google 930 2
>> 2 20 facebook 1000 2
>> 3 21 yahoo 935 1
>> 4 25 facebook 1015 1
>> 5 61 google 940 1
>
> Have I missed a built-in function to obtain this result?
ddply(d, .(user_id), transform, count = nrow)
?
Hadley
--
http://had.co.nz/
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