def test_central_divided_difference_gaps_step2(self): """ Central divided difference with gaps in walker and step=2. """ orig = [(1, 5), (2, 4), (3, 4), (4, 4), (6, 4), (8, 3), (10, 6)] expected = [(6, -0.25), (8, 0.5)] walker = (('a', p, v) for p, v in orig) assert_equal([(p, v) for _, p, v in central_divided_difference(walker, step=2)], expected)
def test_central_divided_difference_gaps(self): """ Central divided difference with gaps in walker. """ orig = [(1, 5), (2, 4), (3, 4), (4, 4), (6, 4), (7, 3), (10, 6)] expected = [(2, -0.5), (3, 0)] walker = (('a', p, v) for p, v in orig) assert_equal([(p, v) for _, p, v in central_divided_difference(walker)], expected)
def test_central_divided_difference(self): """ Simple central divided difference. """ orig = [(1, 5), (2, 4), (3, 4), (4, 4), (5, 5), (6, 4), (7, 3), (8, 1), (9, 5), (10, 6)] expected = [(2, -0.5), (3, 0), (4, 0.5), (5, 0), (6, -1), (7, -1.5), (8, 1), (9, 2.5)] walker = (('a', p, v) for p, v in orig) assert_equal([(p, v) for _, p, v in central_divided_difference(walker)], expected)
def test_central_divided_difference_gaps_step2(self): """ Central divided difference with gaps in walker and step=2. """ orig = [(1, 5), (2, 4), (3, 4), (4, 4), (6, 4), (8, 3), (10, 6)] expected = [(6, -0.25), (8, 0.5)] walker = (('a', p, v) for p, v in orig) assert_equal( [(p, v) for _, p, v in central_divided_difference(walker, step=2)], expected)