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from math import nan, inf
import pytest
from numpy.core import array, arange, printoptions
import numpy.polynomial as poly
from numpy.testing import assert_equal, assert_
# For testing polynomial printing with object arrays
from fractions import Fraction
from decimal import Decimal
class TestStrUnicodeSuperSubscripts:
@pytest.fixture(scope='class', autouse=True)
def use_unicode(self):
poly.set_default_printstyle('unicode')
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·x + 3.0·x²"),
([-1, 0, 3, -1], "-1.0 + 0.0·x + 3.0·x² - 1.0·x³"),
(arange(12), ("0.0 + 1.0·x + 2.0·x² + 3.0·x³ + 4.0·x⁴ + 5.0·x⁵ + "
"6.0·x⁶ + 7.0·x⁷ +\n8.0·x⁸ + 9.0·x⁹ + 10.0·x¹⁰ + "
"11.0·x¹¹")),
))
def test_polynomial_str(self, inp, tgt):
res = str(poly.Polynomial(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·T₁(x) + 3.0·T₂(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0·T₁(x) + 3.0·T₂(x) - 1.0·T₃(x)"),
(arange(12), ("0.0 + 1.0·T₁(x) + 2.0·T₂(x) + 3.0·T₃(x) + 4.0·T₄(x) + "
"5.0·T₅(x) +\n6.0·T₆(x) + 7.0·T₇(x) + 8.0·T₈(x) + "
"9.0·T₉(x) + 10.0·T₁₀(x) + 11.0·T₁₁(x)")),
))
def test_chebyshev_str(self, inp, tgt):
res = str(poly.Chebyshev(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·P₁(x) + 3.0·P₂(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0·P₁(x) + 3.0·P₂(x) - 1.0·P₃(x)"),
(arange(12), ("0.0 + 1.0·P₁(x) + 2.0·P₂(x) + 3.0·P₃(x) + 4.0·P₄(x) + "
"5.0·P₅(x) +\n6.0·P₆(x) + 7.0·P₇(x) + 8.0·P₈(x) + "
"9.0·P₉(x) + 10.0·P₁₀(x) + 11.0·P₁₁(x)")),
))
def test_legendre_str(self, inp, tgt):
res = str(poly.Legendre(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·H₁(x) + 3.0·H₂(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0·H₁(x) + 3.0·H₂(x) - 1.0·H₃(x)"),
(arange(12), ("0.0 + 1.0·H₁(x) + 2.0·H₂(x) + 3.0·H₃(x) + 4.0·H₄(x) + "
"5.0·H₅(x) +\n6.0·H₆(x) + 7.0·H₇(x) + 8.0·H₈(x) + "
"9.0·H₉(x) + 10.0·H₁₀(x) + 11.0·H₁₁(x)")),
))
def test_hermite_str(self, inp, tgt):
res = str(poly.Hermite(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·He₁(x) + 3.0·He₂(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0·He₁(x) + 3.0·He₂(x) - 1.0·He₃(x)"),
(arange(12), ("0.0 + 1.0·He₁(x) + 2.0·He₂(x) + 3.0·He₃(x) + "
"4.0·He₄(x) + 5.0·He₅(x) +\n6.0·He₆(x) + 7.0·He₇(x) + "
"8.0·He₈(x) + 9.0·He₉(x) + 10.0·He₁₀(x) +\n"
"11.0·He₁₁(x)")),
))
def test_hermiteE_str(self, inp, tgt):
res = str(poly.HermiteE(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0·L₁(x) + 3.0·L₂(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0·L₁(x) + 3.0·L₂(x) - 1.0·L₃(x)"),
(arange(12), ("0.0 + 1.0·L₁(x) + 2.0·L₂(x) + 3.0·L₃(x) + 4.0·L₄(x) + "
"5.0·L₅(x) +\n6.0·L₆(x) + 7.0·L₇(x) + 8.0·L₈(x) + "
"9.0·L₉(x) + 10.0·L₁₀(x) + 11.0·L₁₁(x)")),
))
def test_laguerre_str(self, inp, tgt):
res = str(poly.Laguerre(inp))
assert_equal(res, tgt)
class TestStrAscii:
@pytest.fixture(scope='class', autouse=True)
def use_ascii(self):
poly.set_default_printstyle('ascii')
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 x + 3.0 x**2"),
([-1, 0, 3, -1], "-1.0 + 0.0 x + 3.0 x**2 - 1.0 x**3"),
(arange(12), ("0.0 + 1.0 x + 2.0 x**2 + 3.0 x**3 + 4.0 x**4 + "
"5.0 x**5 + 6.0 x**6 +\n7.0 x**7 + 8.0 x**8 + "
"9.0 x**9 + 10.0 x**10 + 11.0 x**11")),
))
def test_polynomial_str(self, inp, tgt):
res = str(poly.Polynomial(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 T_1(x) + 3.0 T_2(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0 T_1(x) + 3.0 T_2(x) - 1.0 T_3(x)"),
(arange(12), ("0.0 + 1.0 T_1(x) + 2.0 T_2(x) + 3.0 T_3(x) + "
"4.0 T_4(x) + 5.0 T_5(x) +\n6.0 T_6(x) + 7.0 T_7(x) + "
"8.0 T_8(x) + 9.0 T_9(x) + 10.0 T_10(x) +\n"
"11.0 T_11(x)")),
))
def test_chebyshev_str(self, inp, tgt):
res = str(poly.Chebyshev(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 P_1(x) + 3.0 P_2(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0 P_1(x) + 3.0 P_2(x) - 1.0 P_3(x)"),
(arange(12), ("0.0 + 1.0 P_1(x) + 2.0 P_2(x) + 3.0 P_3(x) + "
"4.0 P_4(x) + 5.0 P_5(x) +\n6.0 P_6(x) + 7.0 P_7(x) + "
"8.0 P_8(x) + 9.0 P_9(x) + 10.0 P_10(x) +\n"
"11.0 P_11(x)")),
))
def test_legendre_str(self, inp, tgt):
res = str(poly.Legendre(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 H_1(x) + 3.0 H_2(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0 H_1(x) + 3.0 H_2(x) - 1.0 H_3(x)"),
(arange(12), ("0.0 + 1.0 H_1(x) + 2.0 H_2(x) + 3.0 H_3(x) + "
"4.0 H_4(x) + 5.0 H_5(x) +\n6.0 H_6(x) + 7.0 H_7(x) + "
"8.0 H_8(x) + 9.0 H_9(x) + 10.0 H_10(x) +\n"
"11.0 H_11(x)")),
))
def test_hermite_str(self, inp, tgt):
res = str(poly.Hermite(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 He_1(x) + 3.0 He_2(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0 He_1(x) + 3.0 He_2(x) - 1.0 He_3(x)"),
(arange(12), ("0.0 + 1.0 He_1(x) + 2.0 He_2(x) + 3.0 He_3(x) + "
"4.0 He_4(x) +\n5.0 He_5(x) + 6.0 He_6(x) + "
"7.0 He_7(x) + 8.0 He_8(x) + 9.0 He_9(x) +\n"
"10.0 He_10(x) + 11.0 He_11(x)")),
))
def test_hermiteE_str(self, inp, tgt):
res = str(poly.HermiteE(inp))
assert_equal(res, tgt)
@pytest.mark.parametrize(('inp', 'tgt'), (
([1, 2, 3], "1.0 + 2.0 L_1(x) + 3.0 L_2(x)"),
([-1, 0, 3, -1], "-1.0 + 0.0 L_1(x) + 3.0 L_2(x) - 1.0 L_3(x)"),
(arange(12), ("0.0 + 1.0 L_1(x) + 2.0 L_2(x) + 3.0 L_3(x) + "
"4.0 L_4(x) + 5.0 L_5(x) +\n6.0 L_6(x) + 7.0 L_7(x) + "
"8.0 L_8(x) + 9.0 L_9(x) + 10.0 L_10(x) +\n"
"11.0 L_11(x)")),
))
def test_laguerre_str(self, inp, tgt):
res = str(poly.Laguerre(inp))
assert_equal(res, tgt)
class TestLinebreaking:
@pytest.fixture(scope='class', autouse=True)
def use_ascii(self):
poly.set_default_printstyle('ascii')
def test_single_line_one_less(self):
# With 'ascii' style, len(str(p)) is default linewidth - 1 (i.e. 74)
p = poly.Polynomial([12345678, 12345678, 12345678, 12345678, 123])
assert_equal(len(str(p)), 74)
assert_equal(str(p), (
'12345678.0 + 12345678.0 x + 12345678.0 x**2 + '
'12345678.0 x**3 + 123.0 x**4'
))
def test_num_chars_is_linewidth(self):
# len(str(p)) == default linewidth == 75
p = poly.Polynomial([12345678, 12345678, 12345678, 12345678, 1234])
assert_equal(len(str(p)), 75)
assert_equal(str(p), (
'12345678.0 + 12345678.0 x + 12345678.0 x**2 + '
'12345678.0 x**3 +\n1234.0 x**4'
))
def test_first_linebreak_multiline_one_less_than_linewidth(self):
# Multiline str where len(first_line) + len(next_term) == lw - 1 == 74
p = poly.Polynomial(
[12345678, 12345678, 12345678, 12345678, 1, 12345678]
)
assert_equal(len(str(p).split('\n')[0]), 74)
assert_equal(str(p), (
'12345678.0 + 12345678.0 x + 12345678.0 x**2 + '
'12345678.0 x**3 + 1.0 x**4 +\n12345678.0 x**5'
))
def test_first_linebreak_multiline_on_linewidth(self):
# First line is one character longer than previous test
p = poly.Polynomial(
[12345678, 12345678, 12345678, 12345678.12, 1, 12345678]
)
assert_equal(str(p), (
'12345678.0 + 12345678.0 x + 12345678.0 x**2 + '
'12345678.12 x**3 +\n1.0 x**4 + 12345678.0 x**5'
))
@pytest.mark.parametrize(('lw', 'tgt'), (
(75, ('0.0 + 10.0 x + 200.0 x**2 + 3000.0 x**3 + 40000.0 x**4 + '
'500000.0 x**5 +\n600000.0 x**6 + 70000.0 x**7 + 8000.0 x**8 + '
'900.0 x**9')),
(45, ('0.0 + 10.0 x + 200.0 x**2 + 3000.0 x**3 +\n40000.0 x**4 + '
'500000.0 x**5 +\n600000.0 x**6 + 70000.0 x**7 + 8000.0 x**8 +\n'
'900.0 x**9')),
(132, ('0.0 + 10.0 x + 200.0 x**2 + 3000.0 x**3 + 40000.0 x**4 + '
'500000.0 x**5 + 600000.0 x**6 + 70000.0 x**7 + 8000.0 x**8 + '
'900.0 x**9')),
))
def test_linewidth_printoption(self, lw, tgt):
p = poly.Polynomial(
[0, 10, 200, 3000, 40000, 500000, 600000, 70000, 8000, 900]
)
with printoptions(linewidth=lw):
assert_equal(str(p), tgt)
for line in str(p).split('\n'):
assert_(len(line) < lw)
def test_set_default_printoptions():
p = poly.Polynomial([1, 2, 3])
c = poly.Chebyshev([1, 2, 3])
poly.set_default_printstyle('ascii')
assert_equal(str(p), "1.0 + 2.0 x + 3.0 x**2")
assert_equal(str(c), "1.0 + 2.0 T_1(x) + 3.0 T_2(x)")
poly.set_default_printstyle('unicode')
assert_equal(str(p), "1.0 + 2.0·x + 3.0·x²")
assert_equal(str(c), "1.0 + 2.0·T₁(x) + 3.0·T₂(x)")
with pytest.raises(ValueError):
poly.set_default_printstyle('invalid_input')
def test_complex_coefficients():
"""Test both numpy and built-in complex."""
coefs = [0+1j, 1+1j, -2+2j, 3+0j]
# numpy complex
p1 = poly.Polynomial(coefs)
# Python complex
p2 = poly.Polynomial(array(coefs, dtype=object))
poly.set_default_printstyle('unicode')
assert_equal(str(p1), "1j + (1+1j)·x - (2-2j)·x² + (3+0j)·x³")
assert_equal(str(p2), "1j + (1+1j)·x + (-2+2j)·x² + (3+0j)·x³")
poly.set_default_printstyle('ascii')
assert_equal(str(p1), "1j + (1+1j) x - (2-2j) x**2 + (3+0j) x**3")
assert_equal(str(p2), "1j + (1+1j) x + (-2+2j) x**2 + (3+0j) x**3")
@pytest.mark.parametrize(('coefs', 'tgt'), (
(array([Fraction(1, 2), Fraction(3, 4)], dtype=object), (
"1/2 + 3/4·x"
)),
(array([1, 2, Fraction(5, 7)], dtype=object), (
"1 + 2·x + 5/7·x²"
)),
(array([Decimal('1.00'), Decimal('2.2'), 3], dtype=object), (
"1.00 + 2.2·x + 3·x²"
)),
))
def test_numeric_object_coefficients(coefs, tgt):
p = poly.Polynomial(coefs)
poly.set_default_printstyle('unicode')
assert_equal(str(p), tgt)
@pytest.mark.parametrize(('coefs', 'tgt'), (
(array([1, 2, 'f'], dtype=object), '1 + 2·x + f·x²'),
(array([1, 2, [3, 4]], dtype=object), '1 + 2·x + [3, 4]·x²'),
))
def test_nonnumeric_object_coefficients(coefs, tgt):
"""
Test coef fallback for object arrays of non-numeric coefficients.
"""
p = poly.Polynomial(coefs)
poly.set_default_printstyle('unicode')
assert_equal(str(p), tgt)
class TestFormat:
def test_format_unicode(self):
poly.set_default_printstyle('ascii')
p = poly.Polynomial([1, 2, 0, -1])
assert_equal(format(p, 'unicode'), "1.0 + 2.0·x + 0.0·x² - 1.0·x³")
def test_format_ascii(self):
poly.set_default_printstyle('unicode')
p = poly.Polynomial([1, 2, 0, -1])
assert_equal(
format(p, 'ascii'), "1.0 + 2.0 x + 0.0 x**2 - 1.0 x**3"
)
def test_empty_formatstr(self):
poly.set_default_printstyle('ascii')
p = poly.Polynomial([1, 2, 3])
assert_equal(format(p), "1.0 + 2.0 x + 3.0 x**2")
assert_equal(f"{p}", "1.0 + 2.0 x + 3.0 x**2")
def test_bad_formatstr(self):
p = poly.Polynomial([1, 2, 0, -1])
with pytest.raises(ValueError):
format(p, '.2f')
@pytest.mark.parametrize(('poly', 'tgt'), (
(poly.Polynomial, '1.0 + 2.0·z + 3.0·z²'),
(poly.Chebyshev, '1.0 + 2.0·T₁(z) + 3.0·T₂(z)'),
(poly.Hermite, '1.0 + 2.0·H₁(z) + 3.0·H₂(z)'),
(poly.HermiteE, '1.0 + 2.0·He₁(z) + 3.0·He₂(z)'),
(poly.Laguerre, '1.0 + 2.0·L₁(z) + 3.0·L₂(z)'),
(poly.Legendre, '1.0 + 2.0·P₁(z) + 3.0·P₂(z)'),
))
def test_symbol(poly, tgt):
p = poly([1, 2, 3], symbol='z')
assert_equal(f"{p:unicode}", tgt)
class TestRepr:
def test_polynomial_str(self):
res = repr(poly.Polynomial([0, 1]))
tgt = (
"Polynomial([0., 1.], domain=[-1, 1], window=[-1, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
def test_chebyshev_str(self):
res = repr(poly.Chebyshev([0, 1]))
tgt = (
"Chebyshev([0., 1.], domain=[-1, 1], window=[-1, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
def test_legendre_repr(self):
res = repr(poly.Legendre([0, 1]))
tgt = (
"Legendre([0., 1.], domain=[-1, 1], window=[-1, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
def test_hermite_repr(self):
res = repr(poly.Hermite([0, 1]))
tgt = (
"Hermite([0., 1.], domain=[-1, 1], window=[-1, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
def test_hermiteE_repr(self):
res = repr(poly.HermiteE([0, 1]))
tgt = (
"HermiteE([0., 1.], domain=[-1, 1], window=[-1, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
def test_laguerre_repr(self):
res = repr(poly.Laguerre([0, 1]))
tgt = (
"Laguerre([0., 1.], domain=[0, 1], window=[0, 1], "
"symbol='x')"
)
assert_equal(res, tgt)
class TestLatexRepr:
"""Test the latex repr used by Jupyter"""
def as_latex(self, obj):
# right now we ignore the formatting of scalars in our tests, since
# it makes them too verbose. Ideally, the formatting of scalars will
# be fixed such that tests below continue to pass
obj._repr_latex_scalar = lambda x, parens=False: str(x)
try:
return obj._repr_latex_()
finally:
del obj._repr_latex_scalar
def test_simple_polynomial(self):
# default input
p = poly.Polynomial([1, 2, 3])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0 + 2.0\,x + 3.0\,x^{2}$')
# translated input
p = poly.Polynomial([1, 2, 3], domain=[-2, 0])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0 + 2.0\,\left(1.0 + x\right) + 3.0\,\left(1.0 + x\right)^{2}$')
# scaled input
p = poly.Polynomial([1, 2, 3], domain=[-0.5, 0.5])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0 + 2.0\,\left(2.0x\right) + 3.0\,\left(2.0x\right)^{2}$')
# affine input
p = poly.Polynomial([1, 2, 3], domain=[-1, 0])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0 + 2.0\,\left(1.0 + 2.0x\right) + 3.0\,\left(1.0 + 2.0x\right)^{2}$')
def test_basis_func(self):
p = poly.Chebyshev([1, 2, 3])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0\,{T}_{0}(x) + 2.0\,{T}_{1}(x) + 3.0\,{T}_{2}(x)$')
# affine input - check no surplus parens are added
p = poly.Chebyshev([1, 2, 3], domain=[-1, 0])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0\,{T}_{0}(1.0 + 2.0x) + 2.0\,{T}_{1}(1.0 + 2.0x) + 3.0\,{T}_{2}(1.0 + 2.0x)$')
def test_multichar_basis_func(self):
p = poly.HermiteE([1, 2, 3])
assert_equal(self.as_latex(p),
r'$x \mapsto 1.0\,{He}_{0}(x) + 2.0\,{He}_{1}(x) + 3.0\,{He}_{2}(x)$')
def test_symbol_basic(self):
# default input
p = poly.Polynomial([1, 2, 3], symbol='z')
assert_equal(self.as_latex(p),
r'$z \mapsto 1.0 + 2.0\,z + 3.0\,z^{2}$')
# translated input
p = poly.Polynomial([1, 2, 3], domain=[-2, 0], symbol='z')
assert_equal(
self.as_latex(p),
(
r'$z \mapsto 1.0 + 2.0\,\left(1.0 + z\right) + 3.0\,'
r'\left(1.0 + z\right)^{2}$'
),
)
# scaled input
p = poly.Polynomial([1, 2, 3], domain=[-0.5, 0.5], symbol='z')
assert_equal(
self.as_latex(p),
(
r'$z \mapsto 1.0 + 2.0\,\left(2.0z\right) + 3.0\,'
r'\left(2.0z\right)^{2}$'
),
)
# affine input
p = poly.Polynomial([1, 2, 3], domain=[-1, 0], symbol='z')
assert_equal(
self.as_latex(p),
(
r'$z \mapsto 1.0 + 2.0\,\left(1.0 + 2.0z\right) + 3.0\,'
r'\left(1.0 + 2.0z\right)^{2}$'
),
)
SWITCH_TO_EXP = (
'1.0 + (1.0e-01) x + (1.0e-02) x**2',
'1.2 + (1.2e-01) x + (1.2e-02) x**2',
'1.23 + 0.12 x + (1.23e-02) x**2 + (1.23e-03) x**3',
'1.235 + 0.123 x + (1.235e-02) x**2 + (1.235e-03) x**3',
'1.2346 + 0.1235 x + 0.0123 x**2 + (1.2346e-03) x**3 + (1.2346e-04) x**4',
'1.23457 + 0.12346 x + 0.01235 x**2 + (1.23457e-03) x**3 + '
'(1.23457e-04) x**4',
'1.234568 + 0.123457 x + 0.012346 x**2 + 0.001235 x**3 + '
'(1.234568e-04) x**4 + (1.234568e-05) x**5',
'1.2345679 + 0.1234568 x + 0.0123457 x**2 + 0.0012346 x**3 + '
'(1.2345679e-04) x**4 + (1.2345679e-05) x**5')
class TestPrintOptions:
"""
Test the output is properly configured via printoptions.
The exponential notation is enabled automatically when the values
are too small or too large.
"""
@pytest.fixture(scope='class', autouse=True)
def use_ascii(self):
poly.set_default_printstyle('ascii')
def test_str(self):
p = poly.Polynomial([1/2, 1/7, 1/7*10**8, 1/7*10**9])
assert_equal(str(p), '0.5 + 0.14285714 x + 14285714.28571429 x**2 '
'+ (1.42857143e+08) x**3')
with printoptions(precision=3):
assert_equal(str(p), '0.5 + 0.143 x + 14285714.286 x**2 '
'+ (1.429e+08) x**3')
def test_latex(self):
p = poly.Polynomial([1/2, 1/7, 1/7*10**8, 1/7*10**9])
assert_equal(p._repr_latex_(),
r'$x \mapsto \text{0.5} + \text{0.14285714}\,x + '
r'\text{14285714.28571429}\,x^{2} + '
r'\text{(1.42857143e+08)}\,x^{3}$')
with printoptions(precision=3):
assert_equal(p._repr_latex_(),
r'$x \mapsto \text{0.5} + \text{0.143}\,x + '
r'\text{14285714.286}\,x^{2} + \text{(1.429e+08)}\,x^{3}$')
def test_fixed(self):
p = poly.Polynomial([1/2])
assert_equal(str(p), '0.5')
with printoptions(floatmode='fixed'):
assert_equal(str(p), '0.50000000')
with printoptions(floatmode='fixed', precision=4):
assert_equal(str(p), '0.5000')
def test_switch_to_exp(self):
for i, s in enumerate(SWITCH_TO_EXP):
with printoptions(precision=i):
p = poly.Polynomial([1.23456789*10**-i
for i in range(i//2+3)])
assert str(p).replace('\n', ' ') == s
def test_non_finite(self):
p = poly.Polynomial([nan, inf])
assert str(p) == 'nan + inf x'
assert p._repr_latex_() == r'$x \mapsto \text{nan} + \text{inf}\,x$'
with printoptions(nanstr='NAN', infstr='INF'):
assert str(p) == 'NAN + INF x'
assert p._repr_latex_() == \
r'$x \mapsto \text{NAN} + \text{INF}\,x$'
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