#7206: doctest failure in groups/perm_gps/permgroup.py
----------------------------+-----------------------------------------------
Reporter: ddrake | Owner: joyner
Type: defect | Status: new
Priority: major | Milestone: sage-4.2
Component: group_theory | Keywords:
Work_issues: | Author:
Reviewer: | Merged:
----------------------------+-----------------------------------------------
Comment(by nborie):
Hy Dan,
With 4.1.1 and sage-combinat queue applied (the patch come from here :
#6647), I have
{{{
nico...@nicolas-laptop:/opt/sage/devel/sage-combinat$ sage -t
sage/groups/perm_gps/permgroup.py
sage -t "devel/sage-combinat/sage/groups/perm_gps/permgroup.py"
[5.4 s]
----------------------------------------------------------------------
All tests passed!
Total time for all tests: 5.4 seconds
}}}
But, if I play with the method .random_element()
{{{
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element()
()
sage: G.random_element()
(4,5)
sage: G.random_element()
(1,3,2)(4,5)
sage: G.random_element()
(1,3,2)
sage: G.random_element()
(2,3)(4,5)
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element()
(4,5)
sage: G.random_element()
(1,3,2)
sage: G.random_element()
(1,3,2)
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element()
(2,3)(4,5)
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element()
(1,3,2)
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element()
(1,3)
}}}
I saw your pointer from my patch about strong generating system. I didn't
touch random_element(). I would be very happy to help and investigate this
but my guess is that touch interface and Gap behavior... I don't know even
if it is possible to put a doctest on such random method where the random
part is inside Gap and not inside Sage...
I don't really know that is very important in this doctest, a possible
trick is
{{{
sage: G = PermutationGroup([[(1,2,3),(4,5)],[(1,2)]])
sage: G.random_element() in G
True
}}}
Here, one's can be sure there no timestamps random dependencies of Gap or
other things I should not say because I really don't know anything about
random and Gap.
If anyone know something about that ?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7206#comment:2>
Sage <http://www.sagemath.org>
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