#16865: Dot2tex reverses Poset.show() upside down
-------------------------------------+-------------------------------------
Reporter: jmantysalo | Owner:
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-6.7
Component: packages: | Resolution:
optional | Merged in:
Keywords: poset, dot2tex | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: u/nthiery/graphs | 08e9b8e4e2109bec4ffb7d0b6807b5278495883c
/dot2tex-rankdir-16865 | Stopgaps:
Dependencies: |
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Old description:
> `Poset([[1,2],[[1,2]]]).show()` says `2`, so one expect
>
> {{{
> Poset([[1,2],[[1,2]]]).show()
> }}}
>
> showing to "2" on top. And so it happens without dot2tex. However, it
> shows "1" at top if dot2tex is installed. This was changed from version
> 6.1 to 6.2.
>
> This ticket implements a `rankdir` option for `DiGraph.layout_acyclic`
> and sets a default value of 'up' for all implementations, which fixes the
> above inconsistency, while leaving the `down` feature available to
> whoever would really care.
New description:
`Poset([[1,2],[[1,2]]]).top()` says `2`, so one expect
{{{
Poset([[1,2],[[1,2]]]).show()
}}}
showing to "2" on top. And so it happens without dot2tex. However, it
shows "1" at top if dot2tex is installed. This was changed from version
6.1 to 6.2.
This ticket implements a `rankdir` option for `DiGraph.layout_acyclic` and
sets a default value of 'up' for all implementations, which fixes the
above inconsistency, while leaving the `down` feature available to whoever
would really care.
--
Comment (by jmantysalo):
I tested with some random posets and with empty and 1-element poset. Seems
to work.
But still I don't know Sage internals enought to be able to review this.
Sorry for that.
--
Ticket URL: <http://trac.sagemath.org/ticket/16865#comment:30>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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