Try this:
rowsum(x, y)
On Wed, Aug 31, 2011 at 1:45 PM, zhenjiang xu <zhenjiang...@gmail.com> 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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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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