rowSwap(m,i,j)
i1 : m = mutableMatrix matrix{{1,2,3},{4,5,6}} o1 = | 1 2 3 | | 4 5 6 | o1 : MutableMatrix
i2 : rowSwap(m,0,1) o2 = | 4 5 6 | | 1 2 3 | o2 : MutableMatrix
i3 : m o3 = | 4 5 6 | | 1 2 3 | o3 : MutableMatrix
The object rowSwap is a method function.