Maybe I misunderstand your problem. For my understanding, it's quite
simple.I hope it can help.
id <- vector()
for(i in 1:10){
for(j in 1:10){
id<-append(id,paste("X",i,j,sep="_"))
}
}
Wenbo Mu
On Tue, Jul 13, 2010 at 5:44 PM, He, Yulei <h...@hcp.med.harvard.edu> wrote:
> Hi, there:
>
> Suppose I want create variables with indexes in their names, e.g., X_1_1,
> X_1_2, X_1_3, ..., X_1_10, X_2_1, X_2_2, X_2_3, .. X_2_10,..., X_10_1,
> X_10_2, ... X_10_10. It looks like I need to use 2 indexes I and J so I is
> looped from 1 to 10, and J is looped from 1 to 10. But I don't know how to
> automatically produce X with these combination of indexes. Should I use paste
> function? Can someone help?
>
> Thanks.
>
> Yulei
>
>
> [[alternative HTML version deleted]]
>
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