#19037: Cplex backend: allow to set logfile
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Reporter: dcoudert | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: linear | Resolution:
programming | Merged in:
Keywords: | Reviewers:
Authors: David Coudert | Work issues:
Report Upstream: N/A | Commit:
Branch: public/19037 | 0e5fb5b7682d7dda735aa2771baf9f1eb1cd9ddc
Dependencies: | Stopgaps:
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Comment (by ncohen):
Hello,
> since `LogFile` is a solver parameter for `Gurobi`, I prefer to have
similar access method for `Cplex`.
> I have added the parameter to the documentation and I'm now using the
`check` method.
Okayokay. Could you write it in the doc somewhere? It only appears as
examples so far.
> Also, I had to
> - modify all doctests of the `cplex_backend.pyx` file for the following
reason: a call to `./sage -t -l --optional=CPLEX
src/sage/numerical/backends/cplex_backend.pyx` was reporting 149 doctests
failures!
That's because you are meant to run optional=sage,cplex.
But people here let things like #18904 to die, so whatever...
> - change some doctests to get rid of deprecation warnings. E.g.,
> {{{
> doctest:858: DeprecationWarning: The default value of 'nonnegative'
will change, to False instead of True. You should add the explicit
'nonnegative=True'.
> See http://trac.sagemath.org/15521 for details.
> }}}
Okayokay. We should have detected this earlier, but then again, #18904...
> I have a remaining doctest error for method `solve`
> I don't know how to fix the example. I can off course change it to
something more understandable. Let me know what you prefer.
It's something weird. I played with it a bit, and it looks like you should
remove the first 'p.solve'. Afterwards it works. Looks like CPLEX does not
like to see a change in the objective function between successive calls to
solve.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/19037#comment:7>
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