x = np.array([(22, 2, -1000000000.0, [1000, 2000.0]), (22, 2, 400.0, [1000,
    2000.0])], dtype=[('f1', '<i4'), ('f2', '<i4'), ('f3', '<f4'), ('f4',
    '<f4', 2)])
xNewView = x.view(dtype=[('f1', '<i4'), ('f2', '<i4'), ('f3', '<f4'), (
    'f41', '<f4'), ('f42', '<f4')])
Splitting numpy array field values that are matrices into column vectors