Hi Zhenjiang,
Try
table(unlist(mapply(function(x, y) rep(x, y), y, x)))
HTH,
Jorge
On Wed, Aug 31, 2011 at 12:45 PM, zhenjiang xu <> wrote:
> Hi R users,
>
> suppose I have two vectors,
> > x=c(1,2,3,4,5)
> > y=c('a','b','c','a','c')
> How can I get a data.frame like this?
> > xy
> count
> a 5
> b 2
> c 8
>
> I know a few ways to fulfill the task. However, I have a huge number
> of this kind calculations, so I'd like an efficient solution. Thanks
>
> --
> Best,
> Zhenjiang
>
> ______________________________________________
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