[R] can I rotate a matrix

[dc896148]

useR's,
I want to be able to rotate a matrix 90 degrees, clockwise.  For example, 
> mat
     [,1] [,2] [,3]
[,1]   1    2     1
[,2]   3    2     6
[,3]   4    5     3

I want to rotate it, so that it looks like this...
     [,1] [,2] [,3]
[,1]   4    3     1
[,2]   5    2     2
[,3]   3    6     1

Does anyone know a quick and straightforward way to do this?

Thanks in advance.
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