> f1
function(x) {
    one <- matrix(1:x, nrow=2)
    as.vector(rbind(one, one))
}
<environment: 0x000000000daaf1c0>
> f1(8)
 [1] 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8

Pat


On 11/11/2013 12:11, Federico Calboli wrote:
Hi All,

I am trying to create an index that returns something like

1,2,1,2,3,4,3,4,5,6,5,6,7,8,7,8

and so on and so forth until a predetermined value (which is obviously even).  
I am trying very hard to avoid for loops or for loops front ends.

I'd be obliged if anybody could offer a suggestion.

BW

F



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