Thank you all!
This looks like the fastest solution, N being big and my machine slow
I'll go for this one.
Thanks,
baptiste
On 22 Jul 2007, at 12:54, Gavin Simpson wrote:
>>
>> I want to make the following array of numbers:
>>
>> -3 -3 -3 -3 -3 -3 -3 -2 -2 -2 -2 -2 -2 -2 ... 3 3 3 3 3 3 3
>> -3 -2 -1 0 1 2 3 -3 -2 -1 0 1 2 3 ... -3 -2 -1 0 1 2 3
>>
>> (3 would be N, a painful example to type number).
>
> This does what you want:
>
> foo <- function(N) {
> reps <- 2*N+1
> matrix(c(rep(-N:N, each = reps), rep(-N:N, times = reps)),
> nrow = 2, byrow = TRUE)
> }
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