def test_basic_eval(self):
n = Variable("x")
n.value = Fraction(25, 5)
self.assertEqual(n.evaluate(), 5)
n2 = Variable("y", sign=False)
n2.value = Variable("a", 3)
self.assertEqual(n2.evaluate(), -3)
def test_basic_eval(self):
n = Variable("x")
n.value = 5
self.assertEqual(n.evaluate(), 5)
n2 = Variable("y", sign=False)
n2.value = 3
self.assertEqual(n2.evaluate(), -3)
n3 = Variable("z", sign=False)
# no value set -> error
self.assertRaises(ValueError, n3.evaluate)
def test_from_roots(self):
y = Variable("y")
x = Variable("x")
p = Polynomial.from_roots([(x, -2), (x, 3), (y, -1), (y, 0)])
y.value = -1
x.value = 1
self.assertEqual(p.evaluate(), 0)
y.value = 1
x.value = 3
self.assertEqual((-p).evaluate(), 0)
y.value = 1
x.value = 1
# (3)(-2)(2)(1)
self.assertEqual(p.evaluate(), -12)
def test_basic_eval(self):
x = Variable("x")
p = SimplePoly(coeffs=[1, -2, 1], var=x)
x.value = 2
self.assertEqual(p.evaluate(), 1)