def test_truediv(self):
x = 2.0
self.assertAlmostEqual(derivative(lambda x: x / x, x),
0)
self.assertAlmostEqual(derivative(lambda x: x / 1.0, x),
1)
self.assertAlmostEqual(derivative(lambda x: 1.0 / x, x),
-1.0 / x**2)
def test_sub(self):
x = 2.0
self.assertAlmostEqual(derivative(lambda x: x - x, x),
0)
self.assertAlmostEqual(derivative(lambda x: x - 11, x),
1)
self.assertAlmostEqual(derivative(lambda x: 11 - x, x),
-1)
def test_add(self):
x = 2.0
self.assertAlmostEqual(derivative(lambda x: x + x, x),
2)
self.assertAlmostEqual(derivative(lambda x: x + 10, x),
1)
self.assertAlmostEqual(derivative(lambda x: 10 + x, x),
1)
def test_mul(self):
x = 2.0
self.assertAlmostEqual(derivative(lambda x: x * x, x),
2 * x)
self.assertAlmostEqual(derivative(lambda x: 5 * x, x),
5)
self.assertAlmostEqual(derivative(lambda x: x * 5, x),
5)
def test_trig(self):
x = 0.5
self.assertAlmostEqual(derivative(sin, x), np.cos(x))
self.assertAlmostEqual(derivative(cos, x), -np.sin(x))
def test_trig(self):
x = 0.5
self.assertAlmostEqual(derivative(sin, x), np.cos(x))
self.assertAlmostEqual(derivative(cos, x), -np.sin(x))