This places the contents of rowA in rowB, and the contents of rowB in rowA.
This is an elementary row operation. See: math:Linear Algebra.
- x-1 + 2ND (MATRIX)
:[[1,2][3,4]]→[A] :rowSwap([A],1,2) :Disp [A]
[[3,4][1,2]] will be displayed.