#3810: [with patch, positive review] make abelian group list/iter and classgroup
list/iter more modern
---------------------------+------------------------------------------------
Reporter: ncalexan | Owner: was
Type: enhancement | Status: new
Priority: minor | Milestone: sage-3.2.2
Component: number theory | Resolution:
Keywords: |
---------------------------+------------------------------------------------
Comment (by cremona):
Replying to [comment:13 mabshoff]:
> I am seeing one doctest failure with this patch applied on a 64 bit
Linux box:
> {{{
> sage -t -long "devel/sage/sage/rings/number_field/class_group.py"
> **********************************************************************
> File "/scratch/mabshoff/release-
cycle/sage-3.2.2.alpha1/devel/sage/sage/rings/number_field/class_group.py",
line 148, in __main__.example_8
> Failed example:
> list(G)###line 117:_sage_ >>> list(G)
> Expected:
> [Trivial principal fractional ideal class, Fractional ideal class
(2, 1/2*a^2 + a - 1/2), Fractional ideal class (2, 1/2*a^2 + 1/2)]
> Got:
> [Trivial principal fractional ideal class, Fractional ideal class
(2, 1/2*a^2 - a + 3/2), Fractional ideal class (2, 1/2*a^2 + 1/2)]
> **********************************************************************
> File "/scratch/mabshoff/release-
cycle/sage-3.2.2.alpha1/devel/sage/sage/rings/number_field/class_group.py",
line 150, in __main__.example_8
> Failed example:
> G.list()###line 119:_sage_ >>> G.list()
> Expected:
> [Trivial principal fractional ideal class, Fractional ideal class
(2, 1/2*a^2 + a - 1/2), Fractional ideal class (2, 1/2*a^2 + 1/2)]
> Got:
> [Trivial principal fractional ideal class, Fractional ideal class
(2, 1/2*a^2 - a + 3/2), Fractional ideal class (2, 1/2*a^2 + 1/2)]
> **********************************************************************
> }}}
What a nuisance; sorry, I only did a 32-bit test at the weekend. The
got/expected are equally valid mathematically, and my guess is that the
difference comes from the pari library.
Would it be dishonest to look for an example for the doctest where the
output was identical on 32- and 64-bit machines?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3810#comment:14>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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