#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):
> it only does so if you hack your Sage installation to make Gurobi the
default
> solver. Correct me if I'm wrong, but isn't the default LP solver GLPK?
Well. No, Gurobi becomes the default solver as soon as you install it.
But that is not the problem Dima. I you remove this "min" or "max" in your
file the doctest does not break anymore, what's the point of insisting to
keep it ? What's the point ?
> Well, I constructed LPs that CPLEX can solve by primal simplex, but not
by the dual. LPs that CPLEX finds out to be infeasible, but for which it
fails to give you an infeasibility certificate. I don't think they can
surprise me any more :-)
Ahahaah... Scary, scary things ....
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13148#comment:6>
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