>>> A = matrix([[1,2,3], [4,5,6]])
>>> A
matrix([[1, 2, 3],
        [4, 5, 6]])
        
>>> flip(A,0)
matrix([[4, 5, 6],
        [1, 2, 3]])
        
>>> flipud(A)
matrix([[4, 5, 6],
        [1, 2, 3]])
        
>>> A[::-1,]
matrix([[4, 5, 6],
        [1, 2, 3]])