#12091: chained inequalities bug in add_constraint to MixedIntegerLinearProgram
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Reporter: dimpase | Owner: ncohen
Type: defect | Status: new
Priority: major | Milestone: sage-5.4
Component: linear programming | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by dimpase):
Replying to [comment:26 vbraun]:
> Patch fixes chained constraints:
indeed! What about more convoluted cases:
{{{
sage: b[0] <= 555/11*b[1] >= 2
2 <= x_0 <= 555/11*x_1
sage: b[0] <= 555/11*b[1] == 2
555/11*x_1 == 2
}}}
the 1st one ought to become 2 inequalities, and the 2nd an inequality and
an equation.
In both cases, the behaviour is rather strange...
Well, I don't know how easy is to make these work, or at least throw an
error.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12091#comment:27>
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