#16490: Create a linear programming backend for cvxopt
-------------------------------------+-------------------------------------
Reporter: ingolfured | Owner: ingolfured
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-6.3
Component: linear | Resolution:
programming | Merged in:
Keywords: | Reviewers: Dima Pasechnik
Authors: Ingólfur | Work issues:
Eðvarðsson | Commit:
Report Upstream: N/A | 3f133331394911218d22d3a298fc049c86a8c034
Branch: | Stopgaps:
u/ingolfured/create_a_linear_programming_backend_for_cvxopt|
Dependencies: |
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Changes (by dimpase):
* status: needs_info => needs_work
Comment:
Replying to [comment:42 ingolfured]:
> Replying to [comment:39 ncohen]:
> > Hey guys, what the hell is this ?
> >
> > {{{
> > def solve(self):
> > ...
> > return 0 # it should be the value of the objective function
> > def set_variable_type(...):
> > ...
> > pass
> > }}}
>
> set_variable_type is cont. by default and cannot be changed. I fixed the
doc for that. The solve method in the backend returns 0 if everything went
ok and the solve in mip.pyx returns the actual value. Therefore this is
anormal behavior (see the ppl or glpk backends for further info) I also
changed the doc for set_verbosity (does not apply for the cvxopt backend).
Let me know if this is sufficient or not.
for consistency, `set_variable_type()` should behave as in `ppl_backend`,
I think. Otherwise, it looks OK.
Regarding `solve()` in the backend returning 0, Nathann writes so much
Sage code that he forgets what he wrote himself, e.g. in the GLPK
backend...
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Ticket URL: <http://trac.sagemath.org/ticket/16490#comment:43>
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