#8934: Trivial bug in computing faces of non-full-dimensional lattice polytopes
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Reporter: novoselt | Owner: mhampton
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.4.2
Component: geometry | Keywords:
Author: Andrey Novoseltsev | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by vbraun):
* cc: vbraun (added)
* status: needs_review => needs_work
Comment:
I'm pretty sure you need the double colon in
{{{
line 545:" Check that Trac 8934 is fixed::"
}}}
or the example will not be typeset correctly.
A special case of non-full-dimensional polytopes is the zero-dimensional
case. This one is also broken, but in a slightly different way:
{{{
sage: p = LatticePolytope(matrix([[0]]))
sage: p.poly_x("i", reduce_dimension=True)
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/home/vbraun/Sage/ToricVariety/<ipython console> in <module>()
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/geometry/lattice_polytope.pyc in poly_x(self, keys,
reduce_dimension)
2223 1 -1 2
2224 """
-> 2225 return self._palp("poly.x -f" + keys, reduce_dimension)
2226
2227 def skeleton(self):
/home/vbraun/Sage/sage/local/lib/python2.6/site-
packages/sage/geometry/lattice_polytope.pyc in _palp(self, command,
reduce_dimension)
772 if self.dim() == 0:
773 raise ValueError, ("Cannot run \"%s\" for the zero-
dimensional "
--> 774 + "polytope!\nPolytope: %s") % (command, self)
775 if self.dim() < self.ambient_dim() and not
reduce_dimension:
776 raise ValueError(("Cannot run PALP for a
%d-dimensional polytope " +
ValueError: Cannot run "poly.x -fi" for the zero-dimensional polytope!
Polytope: A lattice polytope: 0-dimensional, 1 vertices.
}}}
Also, `p.points()` fails for the same reason. It would be great if you
could fix this case as well.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8934#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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