On 10/11/07, Martin Ivanov <[EMAIL PROTECTED]> wrote:
> Dear R users,
> I need to to the the following. Let a= 1 2 3
> 4 5 6
> and b= -1 -2 -3 be (2x3) matrices.
> -4 -5 -6
> I need to combine the two matrices into a new (2x6) matrix like this:
>
> ab = ( 1 -1 2 -2 3 -3 )
> 4 -4 5 -5 6 -6
>
> How can this be done in R?
> (a <- matrix(1:6, nr = 2))
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
> (b <- -a)
[,1] [,2] [,3]
[1,] -1 -3 -5
[2,] -2 -4 -6
> (ans <- rbind(a, b))
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
[3,] -1 -3 -5
[4,] -2 -4 -6
> dim(ans) <- c(2, 6)
> ans
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 1 -1 3 -3 5 -5
[2,] 2 -2 4 -4 6 -6
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