Rotate a Matrix in R

Question

I have a matrix in R like this:

|1|2|3|
|1|2|3|
|1|2|3|

Is there an easy way to rotate the entire matrix by 90 degrees clockwise to get the

Answer 1

Or combined in a single function (based on Eric Leschinski):

rotate  <- function(x, clockwise=T) {
  if (clockwise) { t( apply(x, 2, rev))
  } else {apply( t(x),2, rev)} 
}