#10140: Base sage.geometry.cone on the Parma Polyhedra Library (PPL)
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Reporter: vbraun | Owner: mhampton
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-4.7
Component: geometry | Keywords: ppl
Author: Volker Braun | Upstream: N/A
Reviewer: Andrey Novoseltsev | Merged:
Work_issues: |
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Changes (by novoselt):
* status: needs_review => needs_info
Comment:
So - am I right that PPL does not preserve the order of rays when it
computes the minimal set of generators?
I am a strong believer in preserving this order (i.e. if the given set is
already minimal, the output should be the same, and if there are "extras"
then they should be removed, but the rest should be still in order). If
PPL does not preserve it, I propose adding such "sorting" to the cone
constructor. It should also eliminate the need for many doctest fixes.
The only argument against, I think, is performance, but I doubt that it
will be noticeable in toric geometry computations, where one usually wants
to work with simplicial cones that don't have many rays.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10140#comment:22>
Sage <http://www.sagemath.org>
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