[R] making matrix monotonous

[vincent at 7d4.com]

Dear all,

I'm currently working on correlation matrix.
The function image() is quite useful for visualization.

Before using image(), I'd like to sort the matrix rows/columns,
in order to make the matrix the more monotonous/smooth possible.

Before reinventing the wheel, is there somebody here aware if
such a function already exists ?

Thanks.