another quick question

If I am working with a matrix of type:

typedef matrix< double, rectangle<>, array< compressed<> >, 
row_major >::type Matrix;

what is the easiest way to swap two of the rows?

I.E., I want to do something like
Matrix A(4,4);
/*initialize A*/
swap(A[0],A[1]);

Thanks,
	Sven

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