https://trac.sagemath.org/ticket/25379
Purportetly fixes this randomly occuring bug:
sage -t --long src/sage/coding/code_constructions.py
**********************************************************************
File "src/sage/coding/code_constructions.py", line 624, in
sage.coding.code_constructions.QuadraticResidueCodeOddPair
Failed example:
codes.QuadraticResidueCodeOddPair(17, GF(13))
Exception raised:
Traceback (most recent call last):
File
"/home/vdelecro/sage_patchbot/local/lib/python2.7/site-packages/sage/doctest/forker.py",
line 562, in _run
self.compile_and_execute(example, compiler, test.globs)
File
"/home/vdelecro/sage_patchbot/local/lib/python2.7/site-packages/sage/doctest/forker.py",
line 972, in compile_and_execute
exec(compiled, globs)
File "<doctest
sage.coding.code_constructions.QuadraticResidueCodeOddPair[0]>", line 1, in
<module>
codes.QuadraticResidueCodeOddPair(Integer(17), GF(Integer(13)))
File
"/home/vdelecro/sage_patchbot/local/lib/python2.7/site-packages/sage/coding/code_constructions.py",
line 666, in QuadraticResidueCodeOddPair
return DuadicCodeOddPair(F,Q,N)
File
"/home/vdelecro/sage_patchbot/local/lib/python2.7/site-packages/sage/coding/code_constructions.py",
line 425, in DuadicCodeOddPair
gg1 = P2(coeffs1)
File "sage/structure/parent.pyx", line 920, in
sage.structure.parent.Parent.__call__
(build/cythonized/sage/structure/parent.c:9734)
return mor._call_(x)
File "sage/structure/coerce_maps.pyx", line 145, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_
(build/cythonized/sage/structure/coerce_maps.c:4555)
raise
File "sage/structure/coerce_maps.pyx", line 140, in
sage.structure.coerce_maps.DefaultConvertMap_unique._call_
(build/cythonized/sage/structure/coerce_maps.c:4423)
return C._element_constructor(x)
File
"/home/vdelecro/sage_patchbot/local/lib/python2.7/site-packages/sage/rings/polynomial/polynomial_ring.py",
line 404, in _element_constructor_
return C(self, x, check=check, is_gen=False, construct=construct)
File "sage/rings/polynomial/polynomial_zmod_flint.pyx", line 100, in
sage.rings.polynomial.polynomial_zmod_flint.Polynomial_zmod_flint.__init__
(build/cythonized/sage/rings/polynomial/polynomial_zmod_flint.cpp:14356)
lst = [k(i) for i in x]
File "sage/structure/parent.pyx", line 920, in
sage.structure.parent.Parent.__call__
(build/cythonized/sage/structure/parent.c:9734)
return mor._call_(x)
File "sage/rings/finite_rings/hom_prime_finite_field.pyx", line 46,
in
sage.rings.finite_rings.hom_prime_finite_field.SectionFiniteFieldHomomorphism_prime._call_
(build/cythonized/sage/rings/finite_rings/hom_prime_finite_field.c:3457)
raise ValueError("%s is not in the image of %s" % (x,
self._inverse))
ValueError: 10*z^3 + 9*z^2 + z is not in the image of (map internal to
coercion system -- copy before use)
Ring morphism:
From: Finite Field of size 13
To: Finite Field in z of size 13^4
**********************************************************************
1 item had failures:
1 of 13 in sage.coding.code_constructions.QuadraticResidueCodeOddPair
[146 tests, 1 failure, 2.83 s]
----------------------------------------------------------------------
sage -t --long src/sage/coding/code_constructions.py # 1 doctest failed
----------------------------------------------------------------------
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