( [ ["1.0", "1.0", "1.0", "4.0", 9.99999], ["2.0", "2.0", "2.0", "4.0", 9.99999], ["3.0", "3.0", "3.0", "4.0", 9.99999], ], [ ["3.0", "3.0", "3.0", "5.0", 9.99999], ["2.0", "2.0", "2.0", "5.0", 9.99999], ["1.0", "1.0", "1.0", "5.0", 9.99999], ], "data.dif", [[2, 2, 2, -1], [2, 2, 2, -1], [2, 2, 2, -1]], ) following is output file data.dif 2.000000E+00 2.000000E+00 2.000000E+00 -1.000000E+00 2.000000E+00 2.000000E+00 2.000000E+00 -1.000000E+00 2.000000E+00 2.000000E+00 2.000000E+00 -1.000000E+00