#16979: integral of multivariate polynomial causes strange behaviors
-------------------------+-------------------------------------------------
Reporter: | Owner:
davidamadore | Status: new
Type: defect | Milestone: sage-6.4
Priority: major | Keywords: polynomials integral symbolic
Component: | Authors:
commutative algebra | Report Upstream: N/A
Merged in: | Branch:
Reviewers: | Dependencies:
Work issues: |
Commit: |
Stopgaps: |
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Probably related to issue #14334, the integral of a multivariate
polynomial in sage 6.2 appears to belong to the right parent ring but
causes inexplicable errors when manipulated:
{{{
sage: R.<x,y> = QQ['x','y']
sage: f = x.integral(x)
sage: f
1/2*x^2
sage: parent(f)
Multivariate Polynomial Ring in x, y over Rational Field
sage: f + 0
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<ipython-input-5-90f0fdd2b139> in <module>()
----> 1 f + Integer(0)
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/element.so in
sage.structure.element.RingElement.__add__
(sage/structure/element.c:14696)()
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/coerce.so in
sage.structure.coerce.CoercionModel_cache_maps.bin_op
(sage/structure/coerce.c:7523)()
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/element.so in
sage.structure.element.RingElement.__add__
(sage/structure/element.c:14628)()
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/element.so in
sage.structure.element.ModuleElement._add_
(sage/structure/element.c:10615)()
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/rings/polynomial/multi_polynomial_element.pyc in _add_(self,
right)
212 def _add_(self, right):
213 #return self.parent()(self.__element + right.__element)
--> 214 return self.__class__(self.parent(),self.__element +
right.__element)
215
216 def _sub_(self, right):
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/element.so in
sage.structure.element.Element.__getattr__
(sage/structure/element.c:4022)()
/large/data/work/sage-6.2/local/lib/python2.7/site-
packages/sage/structure/misc.so in
sage.structure.misc.getattr_from_other_class
(sage/structure/misc.c:1775)()
AttributeError:
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'
object has no attribute '_MPolynomial_element__element'
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/16979>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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