#8148: looking at the dual of a poset: IndexError
------------------------------+---------------------------------------------
Reporter: jhpalmieri | Owner: sage-combinat
Type: defect | Status: closed
Priority: major | Milestone: sage-duplicate/invalid/wontfix
Component: combinatorics | Resolution: duplicate
Keywords: | Work_issues:
Upstream: N/A | Reviewer: Lukáš Lánský
Author: | Merged:
Dependencies: |
------------------------------+---------------------------------------------
Changes (by jdemeyer):
* status: positive_review => closed
* reviewer: => Lukáš Lánský
* resolution: => duplicate
Old description:
> In Sage 4.3.2.alpha0:
> {{{
> sage: Q = Poset({1: [], 3: [], 2: [1, 3]})
> sage: Q.show() # works fine
> sage: Q.dual().show()
> ...
> IndexError: list index out of range
> }}}
> Note that the following works, and is what I'm using in my code right
> now:
> {{{
> sage: Poset(Q.hasse_diagram().reverse()).show()
> }}}
> Actually, though, this fails if Q is defined instead to be
> {{{
> sage: Q = Poset({1: [], 2: [1]})
> sage: Q.show() # works fine, although the picture looks a little funny
> sage: Poset(Q.hasse_diagram().reverse()).show()
> ...
> RuntimeError: Error building image
> }}}
New description:
In Sage 4.3.2.alpha0:
{{{
sage: Q = Poset({1: [], 3: [], 2: [1, 3]})
sage: Q.show() # works fine
sage: Q.dual().show()
...
IndexError: list index out of range
}}}
Note that the following works, and is what I'm using in my code right now:
{{{
sage: Poset(Q.hasse_diagram().reverse()).show()
}}}
Actually, though, this fails if Q is defined instead to be
{{{
sage: Q = Poset({1: [], 2: [1]})
sage: Q.show() # works fine, although the picture looks a little funny
sage: Poset(Q.hasse_diagram().reverse()).show()
...
RuntimeError: Error building image
}}}
See #10998 instead.
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8148#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
