#9902: base_extend() not implemented in MPolynomialRing
-----------------------------------+----------------------------------------
Reporter: vbraun | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-4.6
Component: commutative algebra | Keywords:
Author: Volker Braun | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-----------------------------------+----------------------------------------
The base `class Ring` defines `base_extend()`, but the implementation
needs to be overridden in the derived class `MPolynomialRing`:
{{{
sage: sage: P.<x,y,z> = PolynomialRing(QQ,'x, y, z'); P
Multivariate Polynomial Ring in x, y, z over Rational Field
sage: P.base_extend(CC)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/vbraun/opt/sage-4.5.3/devel/sage-main/<ipython console> in
<module>()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/rings/ring.so in sage.rings.ring.Ring.base_extend
(sage/rings/ring.c:3190)()
TypeError: no base extension defined
}}}
The patch implements the override and adds documentation.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9902>
Sage <http://www.sagemath.org>
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