#19365: Bug in lattice_polytope.positive_integer_relations
------------------------+----------------------------
Reporter: tmonteil | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: geometry | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Reported on [http://ask.sagemath.org/question/29797/non-negative-integer-
relations-on-vertices/ this ask question]:
{{{
sage: vertices =
[(1,1,-1,-1,-1),(-1,-1,1,1,-1),(1,-1,-1,-1,1),(-1,1,1,1,1),(1,-1,1,-1,-1)]
sage: p = LatticePolytope(vertices)
sage:
lattice_polytope.positive_integer_relations(p.vertices().column_matrix()
TypeError: unable to make sense of Maxima expression
'"Problemnotfeasible!"' in Sage
}}}
Note that there is a non-negative nontrivial integer relation:
{{{
sage: p.vertices().column_matrix().right_kernel()
Free module of degree 5 and rank 1 over Integer Ring
Echelon basis matrix:
[1 1 1 1 0]
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/19365>
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