def test_diff(self):
"Test differentiation (!!)"
x = Variable("x")
y = Variable("y")
self.assertEqual(x.diff(x), 1)
self.assertEqual(x.diff(y), 0)
self.assertEqual((y**2).diff(y), 2 * y)
self.assertEqual((x + y**2).diff(y), 2 * y)
self.assertEqual((x + y**2).diff(x.key), 1)
self.assertEqual((x + x * y**2).diff(y), 2 * x * y) # pylint: disable=no-member
self.assertEqual((2 * y).diff(y), 2) # pylint: disable=no-member
# test with units
x = Variable("x", units="ft")
d = (3 * x**2).diff(x)
self.assertEqual(d, 6 * x)
# test negative exponent
d = (1 + 1 / y).diff(y)
with SignomialsEnabled():
expected = -y**-2
self.assertEqual(d, expected)
def test_diff(self):
"Test differentiation (!!)"
x = Variable('x')
y = Variable('y')
self.assertEqual(x.diff(x), 1)
self.assertEqual(x.diff(y), 0)
self.assertEqual((y**2).diff(y), 2 * y)
self.assertEqual((x + y**2).diff(y), 2 * y)
self.assertEqual((x + y**2).diff('x'), 1)
self.assertEqual((x + x * y**2).diff(y), 2 * x * y)
self.assertEqual((2 * y).diff(y), 2)
# test with units
x = Variable('x', units='ft')
d = (3 * x**2).diff(x)
self.assertEqual(d, 6 * x)
# test negative exponent
d = (1 + 1 / y).diff(y)
with SignomialsEnabled():
expected = -y**-2
self.assertEqual(d, expected)
def test_diff(self):
"Test differentiation (!!)"
x = Variable('x')
y = Variable('y')
self.assertEqual(x.diff(x), 1)
self.assertEqual(x.diff(y), 0)
self.assertEqual((y**2).diff(y), 2*y)
self.assertEqual((x + y**2).diff(y), 2*y)
self.assertEqual((x + y**2).diff('x'), 1)
self.assertEqual((x + x*y**2).diff(y), 2*x*y)
self.assertEqual((2*y).diff(y), 2)
# test with units
x = Variable('x', units='ft')
d = (3*x**2).diff(x)
self.assertEqual(d, 6*x)
# test negative exponent
d = (1 + 1/y).diff(y)
with SignomialsEnabled():
expected = -y**-2
self.assertEqual(d, expected)
