On 14-05-2012, at 07:14, mrzung wrote:
> hi all,
>
> my data is here,
> --------------------------------------------------------------------------------------------------
> data
>
> clss number
> 1 A 1
> 2 B 2
> 3 C 3
> 4 A 4
> 5 B 5
> 6 C 6
> 7 A 7
> 8 B 8
> 9 C 9
> -----------------------------------------------------------------------------------------------------
> I want to this format
>
> clss number
> A 12
> B 15
> C 18
>
> is there a way to solve this problem?
?aggregate
mydata <- data.frame(clss=rep(c("A","B","C"),rep=3),number=1:9,
stringsAsFactors=FALSE)
aggregate(number ~ .,data=mydata,sum)
Berend
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