#7868: Factoring in fraction fields
-------------------------+--------------------------------------------------
Reporter: spancratz | Owner: AlexGhitza
Type: defect | Status: new
Priority: minor | Milestone: sage-4.3.1
Component: algebra | Keywords: fraction field, factorization
Work_issues: | Author: spancratz
Upstream: N/A | Reviewer:
Merged: |
-------------------------+--------------------------------------------------
The following is a quote from John Cremona,
http://groups.google.com/group/sage-
devel/browse_thread/thread/3638a91c0438f439
I define a rational function in two variables over a finite field:
{{{
sage: R.<x,y> = GF(2)[]
sage: f = x*y/(x+y)
sage: f.parent()
Fraction Field of Multivariate Polynomial Ring in x, y over Finite
Field of size 2
}}}
I try to factor it, and get this error:
{{{
sage: f.factor()
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
/home/masgaj/.sage/temp/host_56_150/17587/_home_masgaj__sage_init_sage_0.py
in <module>()
/local/jec/sage-4.3.rc0/local/lib/python2.6/site-
packages/sage/rings/fraction_field_element.so
in sage.rings.fraction_field_element.FractionFieldElement.factor
(sage/rings/fraction_field_element.c:2972)()
/local/jec/sage-4.3.rc0/local/lib/python2.6/site-
packages/sage/rings/polynomial/multi_polynomial_libsingular.so
in
sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular.factor
(sage/rings/polynomial/multi_polynomial_libsingular.cpp:22701)()
NotImplementedError: proof = True factorization not implemented. Call
factor with proof=False.
}}}
So I do what I am told, but:
{{{
sage: f.factor(proof=False)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/masgaj/.sage/temp/host_56_150/17587/_home_masgaj__sage_init_sage_0.py
in <module>()
TypeError: factor() takes no keyword arguments
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7868>
Sage <http://www.sagemath.org>
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