#4322: modular polynomials database is broken
-----------------------------------------+----------------------------------
Reporter: AlexGhitza | Owner: mabshoff
Type: defect | Status: new
Priority: major | Milestone: sage-3.2
Component: optional packages | Resolution:
Keywords: modular polynomial database |
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Changes (by robertwb):
* owner: robertwb => mabshoff
* component: coercion => optional packages
Comment:
Actually, it looks like it's due to #4021, MPolynomial_libsingular over
ZZ. It still works in the generic case:
{{{
sage: P.<x,y> = ZZ['t']['x,y']
sage: a = sage.rings.polynomial.polydict.PolyDict({(1,0):1,(0,1):-1})
sage: P(a)
x - y
}}}
Despite the fact that polydicts are no longer used, I can't think of any
reason why one would need this construction. More efficient (and less
prone to breakage in the future is) direct construction from a dict.
{{{
sage: P.<x,y> = ZZ[]
sage: P({(1,0):1,(0,1):-1})
x - y
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4322#comment:3>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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