#4539: plural wrapper
---------------------------------------------------------------+------------
Reporter: burcin |
Owner: OleksandrMotsak, AlexanderDreyer
Type: enhancement |
Status: needs_work
Priority: major |
Milestone: sage-4.7.2
Component: algebra |
Keywords: libsingular plural wrapper sd34
Work_issues: detect the doctest with a verbosity side effect |
Upstream: N/A
Reviewer: |
Author:
Merged: |
Dependencies: #7797 #11316 #11856
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Changes (by SimonKing):
* status: needs_review => needs_work
* work_issues: => detect the doctest with a verbosity side effect
Comment:
I get a doctest failure in
sage/rings/polynomial/multi_polynomial_ideal.py. There, a protocol of a
Gröbner basis computation is printed where we do not expect it.
The problem: If one runs the test separately, it works fine:
{{{
sage: A.<x,y,z> = FreeAlgebra(QQ, 3)
sage: H = A.g_algebra({y*x:x*y-z, z*x:x*z+2*x, z*y:y*z-2*y})
sage: H.inject_variables()
Defining x, y, z
sage: I = H.ideal([y^2, x^2, z^2-H.one_element()],coerce=False)
sage: G = vector(I.gens()); G
/mnt/local/king/SAGE/debug/sage-4.7.2.alpha3-prerelease/local/lib/python2.6
/site-packages/sage/modules/free_module.py:366: UserWarning: You are
constructing a free module over a noncommutative ring. Sage does
not have a concept of left/right and both sided modules, so
be careful. It's also
not guaranteed that all multiplications are done from the
right side.
not guaranteed that all multiplications are done from the right
side.""")
/mnt/local/king/SAGE/debug/sage-4.7.2.alpha3-prerelease/local/lib/python2.6
/site-packages/sage/modules/free_module.py:584: UserWarning: You are
constructing a free module over a noncommutative ring. Sage does not have
a concept of left/right and both sided modules be careful. It's also not
guarantied that all multiplications are done from the right side.
warn("""You are constructing a free module over a noncommutative ring.
Sage does not have a concept of left/right and both sided modules be
careful. It's also not guarantied that all multiplications are done from
the right side.""")
(y^2, x^2, z^2 - 1)
}}}
But the same doctest executed as part of the doctest suite has a
{{{
std in (0),(x,y),(dp(2),C)
[4294967295:2]3ss4s6
(S:2)--
product criterion:1 chain criterion:0
}}}
printed after (!!) the result.
So, apparently another test has a side effect. I tried to identify it
(e.g., a test that sets verbosity and forgets to reset it), but I did not
succeed. Also I wonder why one first sees the result and only later sees
the protocol.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4539#comment:65>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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