#9839: Add dual cone computation
----------------------------------+-----------------------------------------
Reporter: novoselt | Owner: mhampton
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.5.3
Component: geometry | Keywords:
Author: Andrey Novoseltsev | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by vbraun):
I don't like that your lattice now needs to have `self.dual()`
implemented:
{{{
sage: c = Cone([(1,0), [0,1]], lattice = ZZ^2)
sage: c.facet_normals()
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/vbraun/opt/sage-4.5.2/devel/sage-main/<ipython console> in
<module>()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/geometry/cone.pyc in facet_normals(self)
1808 """
1809 if "_facet_normals" not in self.__dict__:
-> 1810 M = self.lattice().dual()
1811 P = self.lattice_polytope()
1812 rotate_lifts = not self.is_strictly_convex()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.Parent.__getattr__ (sage/structure/parent.c:5311)()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.getattr_from_other_class
(sage/structure/parent.c:2757)()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.raise_attribute_error
(sage/structure/parent.c:2629)()
AttributeError: 'FreeModule_ambient_pid_with_category' object has no
attribute 'dual'
}}}
This essentially limits you to `ToricLattice`s now. I think it would be
good for `factet_normals()` to use the same lattice otherwise, so `ZZ^n`
works as well.
The rest looks good!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9839#comment:2>
Sage <http://www.sagemath.org>
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