Status: Valid
Owner: ----
CC: [email protected]
Labels: Type-Defect Priority-Critical Polynomial WrongResult
New issue 3256 by [email protected]: Error in Wang's algorithm with
specific random seed
http://code.google.com/p/sympy/issues/detail?id=3256
See https://groups.google.com/d/topic/sympy/QymvWAXFCpA/discussion. There
is a test failure in master with the random seed 13604685. The issue goes
down to Wang's factorization algorithm in the polys. The difference is at
line 920, where a random number is used. The input to dmp_zz_wang is
f = [[[mpz(2)]], [[]], [[mpz(1), mpz(-1)], [mpz(-1), mpz(1),
mpz(0)]]], u = 2, K = ZZ, mod=None.
With this seed, it produces a wrong result (the exponents are all 0).
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