#13646: Bug in p.add_constraint (when input is True/False)
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Reporter: ncohen | Owner: ncohen
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.5
Component: linear programming | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nathann Cohen, Volker Braun | Merged in:
Dependencies: | Stopgaps:
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Description changed by vbraun:
Old description:
> That awful thing again. See bug report at :
> https://groups.google.com/d/topic/sage-support/VVTWhE0w7i0/discussion
>
> The problem is that the linear functions need to integrate with the rest
> of sage to play nice. The patched mip.pyx adds a parent class for linear
> functions and suitable coercion and rich comparison. Now the following
> works as expected:
> {{{
> sage: p = MixedIntegerLinearProgram()
> sage: x = p.new_variable()
> sage: x[1] >= 10
> 10 <= x_0
> sage: 10 <= x[1]
> 10 <= x_0
> }}}
New description:
That awful thing again. See bug report at :
https://groups.google.com/d/topic/sage-support/VVTWhE0w7i0/discussion
The problem is that the linear functions need to integrate with the rest
of sage to play nice. The patched mip.pyx adds a parent class for linear
functions and suitable coercion and rich comparison. Now the following
works as expected:
{{{
sage: p = MixedIntegerLinearProgram()
sage: x = p.new_variable()
sage: x[1] >= 10
10 <= x_0
sage: 10 <= x[1]
10 <= x_0
}}}
Apply [attachment:trac_13646_fix_mip.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13646#comment:8>
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