#18787: doctest symbolic modular integers fix
-------------------------------------+-------------------------------------
Reporter: tmonteil | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.8
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/bug_with_products_of_symbolic_variables_with_modular_integers|
6f9e551e2110aa700b29eee6f379ec93890d7ba8
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by jdemeyer):
* status: needs_review => needs_work
Comment:
With Sage-6.8.rc0:
{{{
**********************************************************************
File "src/sage/symbolic/expression.pyx", line 2821, in
sage.symbolic.expression.Expression._add_
Failed example:
(A + 3*B)*Zmod(9)(6)
Expected:
6*A
Got:
0* + 6*A
**********************************************************************
File "src/sage/symbolic/expression.pyx", line 2823, in
sage.symbolic.expression.Expression._add_
Failed example:
(3*A + 3*B)*Zmod(9)(6)
Expected:
0
Got:
0*
**********************************************************************
File "src/sage/symbolic/expression.pyx", line 2825, in
sage.symbolic.expression.Expression._add_
Failed example:
(3*A + 3*B)*Zmod(9)(6)*A
Exception raised:
Traceback (most recent call last):
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 496, in _run
self.compile_and_execute(example, compiler, test.globs)
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 858, in compile_and_execute
exec(compiled, globs)
File "<doctest sage.symbolic.expression.Expression._add_[24]>", line
1, in <module>
(Integer(3)*A + Integer(3)*B)*Zmod(Integer(9))(Integer(6))*A
File "sage/structure/element.pyx", line 1849, in
sage.structure.element.RingElement.__mul__
(build/cythonized/sage/structure/element.c:16581)
return (<RingElement>left)._mul_(<RingElement>right)
File "sage/symbolic/expression.pyx", line 3148, in
sage.symbolic.expression.Expression._mul_
(build/cythonized/sage/symbolic/expression.cpp:19837)
x = gmul(left._gobj, _right._gobj)
OverflowError: numeric::div(): division by zero
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18787#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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