[R] Rbind help needed

[Thomas Lumley]

On Wed, 27 Nov 2002 Bayesianbay at aol.com wrote:

> Dear list
>
> I have a very simple question which is causing me problems!
>
> I have a matrix A and simply want to rbind this matrix together n times (n is a large number)
> How can I write this in R?
> I know I could do new<-rbind(z,z,z,...z) with z written n times but this will take forever as n is so large.
>
> Is there a simple way to write this?
>

One way is

  t(matrix( rep(t(z), n), nrow=ncol(z)))

There's probably a quicker way using aperm(), as well.

	-thomas

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