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92 lines
3.7 KiB
92 lines
3.7 KiB
5 months ago
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"""Tests for efficient functions for generating Appell sequences."""
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from sympy.core.numbers import Rational as Q
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from sympy.polys.polytools import Poly
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from sympy.testing.pytest import raises
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from sympy.polys.appellseqs import (bernoulli_poly, bernoulli_c_poly,
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euler_poly, genocchi_poly, andre_poly)
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from sympy.abc import x
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def test_bernoulli_poly():
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raises(ValueError, lambda: bernoulli_poly(-1, x))
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assert bernoulli_poly(1, x, polys=True) == Poly(x - Q(1,2))
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assert bernoulli_poly(0, x) == 1
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assert bernoulli_poly(1, x) == x - Q(1,2)
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assert bernoulli_poly(2, x) == x**2 - x + Q(1,6)
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assert bernoulli_poly(3, x) == x**3 - Q(3,2)*x**2 + Q(1,2)*x
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assert bernoulli_poly(4, x) == x**4 - 2*x**3 + x**2 - Q(1,30)
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assert bernoulli_poly(5, x) == x**5 - Q(5,2)*x**4 + Q(5,3)*x**3 - Q(1,6)*x
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assert bernoulli_poly(6, x) == x**6 - 3*x**5 + Q(5,2)*x**4 - Q(1,2)*x**2 + Q(1,42)
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assert bernoulli_poly(1).dummy_eq(x - Q(1,2))
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assert bernoulli_poly(1, polys=True) == Poly(x - Q(1,2))
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def test_bernoulli_c_poly():
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raises(ValueError, lambda: bernoulli_c_poly(-1, x))
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assert bernoulli_c_poly(1, x, polys=True) == Poly(x, domain='QQ')
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assert bernoulli_c_poly(0, x) == 1
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assert bernoulli_c_poly(1, x) == x
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assert bernoulli_c_poly(2, x) == x**2 - Q(1,3)
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assert bernoulli_c_poly(3, x) == x**3 - x
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assert bernoulli_c_poly(4, x) == x**4 - 2*x**2 + Q(7,15)
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assert bernoulli_c_poly(5, x) == x**5 - Q(10,3)*x**3 + Q(7,3)*x
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assert bernoulli_c_poly(6, x) == x**6 - 5*x**4 + 7*x**2 - Q(31,21)
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assert bernoulli_c_poly(1).dummy_eq(x)
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assert bernoulli_c_poly(1, polys=True) == Poly(x, domain='QQ')
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assert 2**8 * bernoulli_poly(8, (x+1)/2).expand() == bernoulli_c_poly(8, x)
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assert 2**9 * bernoulli_poly(9, (x+1)/2).expand() == bernoulli_c_poly(9, x)
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def test_genocchi_poly():
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raises(ValueError, lambda: genocchi_poly(-1, x))
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assert genocchi_poly(2, x, polys=True) == Poly(-2*x + 1)
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assert genocchi_poly(0, x) == 0
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assert genocchi_poly(1, x) == -1
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assert genocchi_poly(2, x) == 1 - 2*x
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assert genocchi_poly(3, x) == 3*x - 3*x**2
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assert genocchi_poly(4, x) == -1 + 6*x**2 - 4*x**3
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assert genocchi_poly(5, x) == -5*x + 10*x**3 - 5*x**4
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assert genocchi_poly(6, x) == 3 - 15*x**2 + 15*x**4 - 6*x**5
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assert genocchi_poly(2).dummy_eq(-2*x + 1)
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assert genocchi_poly(2, polys=True) == Poly(-2*x + 1)
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assert 2 * (bernoulli_poly(8, x) - bernoulli_c_poly(8, x)) == genocchi_poly(8, x)
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assert 2 * (bernoulli_poly(9, x) - bernoulli_c_poly(9, x)) == genocchi_poly(9, x)
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def test_euler_poly():
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raises(ValueError, lambda: euler_poly(-1, x))
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assert euler_poly(1, x, polys=True) == Poly(x - Q(1,2))
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assert euler_poly(0, x) == 1
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assert euler_poly(1, x) == x - Q(1,2)
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assert euler_poly(2, x) == x**2 - x
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assert euler_poly(3, x) == x**3 - Q(3,2)*x**2 + Q(1,4)
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assert euler_poly(4, x) == x**4 - 2*x**3 + x
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assert euler_poly(5, x) == x**5 - Q(5,2)*x**4 + Q(5,2)*x**2 - Q(1,2)
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assert euler_poly(6, x) == x**6 - 3*x**5 + 5*x**3 - 3*x
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assert euler_poly(1).dummy_eq(x - Q(1,2))
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assert euler_poly(1, polys=True) == Poly(x - Q(1,2))
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assert genocchi_poly(9, x) == euler_poly(8, x) * -9
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assert genocchi_poly(10, x) == euler_poly(9, x) * -10
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def test_andre_poly():
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raises(ValueError, lambda: andre_poly(-1, x))
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assert andre_poly(1, x, polys=True) == Poly(x)
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assert andre_poly(0, x) == 1
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assert andre_poly(1, x) == x
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assert andre_poly(2, x) == x**2 - 1
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assert andre_poly(3, x) == x**3 - 3*x
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assert andre_poly(4, x) == x**4 - 6*x**2 + 5
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assert andre_poly(5, x) == x**5 - 10*x**3 + 25*x
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assert andre_poly(6, x) == x**6 - 15*x**4 + 75*x**2 - 61
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assert andre_poly(1).dummy_eq(x)
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assert andre_poly(1, polys=True) == Poly(x)
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