Hi everyone,
I'm looking for a way to 'explode' a matrix like this:
> matrix(1:4,2,2)
[,1] [,2]
[1,] 1 3
[2,] 2 4
into a matrix like this:
> matrix(c(1,1,2,2,1,1,2,2,3,3,4,4,3,3,4,4),4,4)
[,1] [,2] [,3] [,4]
[1,] 1 1 3 3
[2,] 1 1 3 3
[3,] 2 2 4 4
[4,] 2 2 4 4
My current kludge is this:
v1=rep(1:4,each=2,times=2)
v2=v1[order(rep(1:2,each=4,times=2))]
matrix(v2,4,4)
But I'm hoping there's a more efficient solution that I'm not aware of.
Many thanks,
Kevin
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