#13312: Polyhedral bugfixes and improvements
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Reporter: mhampton | Owner: mhampton
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.1
Component: geometry | Resolution:
Keywords: polyhedra, polar | Merged in:
Authors: Marshall Hampton, | Reviewers:
Volker Braun | Work issues:
Report Upstream: N/A | Commit:
Branch: | 9e2fe957e16c53fe39df2d58cb739b0dc416bfd6
u/vbraun/polyhedral_neg_polar | Stopgaps:
Dependencies: #11763 |
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Description changed by vbraun:
Old description:
> The .polar() method of the Polyhedron class is incorrect, currently it
> returns the inversion of the correct answer. Thanks to sarah-marie
> belcastro for pointing this out.
>
> Another bugfix/improvement is adding support for negation, which inverts
> polyhedra. Implementing this revealed that scalar multiplication by
> negative numbers gave incorrect answers for polyhedra with rays.
>
> Finally this adds a convenience function for obtained faces in terms of
> vertex and inequality indices.
>
> Apply
> * [attachment:trac_13312_polyhedral_neg_polar.patch]
New description:
The .polar() method of the Polyhedron class is incorrect, currently it
returns the inversion of the correct answer. Thanks to sarah-marie
belcastro for pointing this out.
Another bugfix/improvement is adding support for negation, which inverts
polyhedra. Implementing this revealed that scalar multiplication by
negative numbers gave incorrect answers for polyhedra with rays.
Finally this adds a convenience function for obtained faces in terms of
vertex and inequality indices.
--
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Ticket URL: <http://trac.sagemath.org/ticket/13312#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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