Also
tapply(x, y, sum)
HTH,
Jorge
On Wed, Aug 31, 2011 at 12:50 PM, Jorge I Velez <> wrote:
> 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
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
