#13148: make LP return the number of variables
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Reporter: dimpase | Owner: ncohen
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.2
Component: linear programming | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by ncohen):
> as far as I am concerned this is an LP with 3 variables, not 2.
> So my code is right :–)
Yeah, but itbreaks doctests.
> (well, you don't have means to control that RgR0, so what?)
None at all. When you add a as a constraint a linar function + two bounds
(min and max) Gurobi automatically creates a newbounded variable and makes
the constraint an equality.
That's stupid, boring, whatever you want, but this is still how it
behaves.
> When you construct the usual dual of such an LP, you'll end up with
> a different dual.
Yeah. That's why I told you by email that you would be surpised by the
behviour of some solvers on his respect.
> hmm, I don't see what you mean here.
If you remove either the min or the max bound from your code Gurobi will
not do that and break the doctest, that's all...
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13148#comment:4>
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