#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 dimpase):
Replying to [comment:8 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 ?
One way or another, this weirdness must be exposed in doctests and/or in
docs. And I'll add this in docs.
I presume there is a function to find the default 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
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13148#comment:9>
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