#10140: Base sage.geometry.cone on the Parma Polyhedra Library (PPL)
-------------------------------------+--------------------------------------
Reporter: vbraun | Owner: mhampton
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.7
Component: geometry | Keywords: ppl
Author: Volker Braun | Upstream: N/A
Reviewer: Andrey Novoseltsev | Merged:
Work_issues: intersect sublattices |
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Comment(by novoselt):
Fan morphisms (will) use cones in sublattices: the kernel fan naturally
lives either in the domain lattice or the kernel sublattice, which
corresponds to different toric varieties.
I also suspect that while you were working on this patch zero rays passed
to the cone constructor were breaking the code and that's why you have
replaced the related doctests. However, there is now a catch for this
case, so they should be fine. In general, I think it is important to allow
zero rays in the input, e.g. if you are constructing a projected cone and
some of the rays are mapped to the origin.
Anyway, I'll take care of sublattices and move here appropriate chunks
from #10943, #10882, and #11200 (unless they get reviewed in the near
future and can be left in front of this one ;-))
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10140#comment:44>
Sage <http://www.sagemath.org>
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