#14581: GLPK incorrectly handles zero bounds
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Reporter: novoselt | Owner: ncohen
Type: defect | Status: new
Priority: major | Milestone: sage-5.10
Component: linear programming | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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{{{
sage: P = MixedIntegerLinearProgram()
sage: x = P["x"]
sage: P.set_max(x, 0)
sage: print P.get_max(x)
None
}}}
The problem is that GLPK backend has `value = False` default parameter
with a test `value == False` later on and zero is equal to false. `None`
has to be used instead!
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14581>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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