Hi ,
what about split function ?
?split divided x into 2 data.frame
a<-split(x,1:2)
a[[1]] first data frame
a[[2]] second data frame
regrads
M
Le 17/02/11 05:35, yf a écrit :
> I want to sample from the ID. For each ID, i want to have 2 set of data. I
> try the sample() function but it didn't work.
>
>> x<-data.frame(id=c(1,1,1,2,2,2,2,3,3,3,4,4), v1=c(1:12), V2=c(12:23))
>> x
> id v1 V2
> 1 1 1 12
> 2 1 2 13
> 3 1 3 14
> 4 2 4 15
> 5 2 5 16
> 6 2 6 17
> 7 2 7 18
> 8 3 8 19
> 9 3 9 20
> 10 3 10 21
> 11 4 11 22
> 12 4 12 23
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