def reverse_rows_ud(matrix):
    """ Flip order of the rows in the matrix[row][col]
    
    Using numpy only fits matrix lists with numbers:

        np_matrix = np.array(matrix)
        return np_matrix.flipud().tolist()
    
    To suit any list element type use general flipud.
    
    This reverse_rows_ud() is equivalent to reverse_list(), because it affects the row index, that is the first index.
    """
    return list(reversed(matrix))