#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):
> > Well. No, Gurobi becomes the default solver as soon as you install it.
> Oh dear... And if I install, say, CPLEX? Will it take over? This is
strange. Even web browsers don't behave like this :–) Anyway...
It would. You will find out how it behaves by looking at
numerical/backends/generic_backend, bottom of the file.
This is made so that the best solver available will be used to solve....
graph problems :-P
> Cause this would not be what I'd call 100% doctest coverage :–)
> OK, I can specify the solver to use, then it will work.
And you woul prefer to specify manually the solver you want to use, in
this case GLPK, and say that the other solvers will not be tested ? This
would be 100% coverage ? Or add one doctest per solver ?
> By the way, how would I mark a test so that it would only be invoked if
GUROBI is installed?
> Is it {{{ # optional ???}}} ? And what would be {{{???}}} there?
It would be # optional - gurobi
There are many instances of that in numerical/gurobi_backend
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13148#comment:8>
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