#14395: Bug in MixedIntegerLinearProgram.polyhedron
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Reporter: ncohen | Owner: ncohen
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.9
Component: linear programming | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Nathann Cohen
Merged in: | Dependencies:
Stopgaps: |
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Small problem in polyhedron when variables are unbounded in both direction
(and not necessarily positive)
{{{
sage: p = MixedIntegerLinearProgram()
sage: x,y = p['x'], p['y']
sage: p.set_min(x,None)
sage: p.set_min(y,None)
sage: p.add_constraint( x <= 1 )
sage: p.add_constraint( x >= -1 )
sage: p.add_constraint( y <= 1 )
sage: p.add_constraint( y >= -1 )
sage: p.polyhedron()
TypeError: bad operand type for unary -: 'NoneType'
}}}
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14395>
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