#19921: Handle zero coefficients when converting asymptotic rings
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Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: asymptotic expansions | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
sage: sage: CR.<Z> = QQ['Z']
sage: sage: CR_mod = CR.quotient((Z^2 - 1)*CR)
sage: sage: R.<x> = AsymptoticRing(growth_group='x^NN',
coefficient_ring=CR)
/local/cheuberg/sage/sage-6.10/local/lib/python2.7/site-
packages/sage/structure/unique_representation.py:1021: FutureWarning: This
class/method/function is marked as experimental. It, its functionality or
its interface might change without a formal deprecation.
See http://trac.sagemath.org/17601 for details.
instance = typecall(cls, *args, **options)
sage: sage: R_mod =
R.change_parameter(coefficient_ring=CR_mod)
sage: sage: e = 1 + x*(Z^2-1)
sage: sage: R_mod(e)
Traceback (most recent call last):
...
ValueError: Cannot include Z^2 - 1*x with parent Exact Term Monoid x^((Non
negative integer semiring)) with coefficients in Univariate Polynomial
Ring in Z over Rational Field in Asymptotic Ring <x^((Non negative integer
semiring))> over Univariate Quotient Polynomial Ring in Zbar over Rational
Field with modulus Z^2 - 1
> *previous* ValueError: Zero coefficient 0 is not allowed in Exact Term
Monoid x^((Non negative integer semiring)) with coefficients in Univariate
Quotient Polynomial Ring in Zbar over Rational Field with modulus Z^2 - 1.
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/19921>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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