#13205: make LP return bounds on variables
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Reporter: dimpase | Owner: ncohen
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.2
Component: linear programming | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: #13148 | Stopgaps:
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Comment (by dimpase):
Replying to [comment:9 ncohen]:
> Actually, do you really need to work with {{{MixedIntegerLinearProgam}}}
? It looks like all you want is to access the backend's methods directly,
and this you can do if you just deal with {{{GenericBackend}}}.
> What about just working with this, and adding to it what you miss from
{{{MixedIntegerLinearProgram}}} ?
OK, I can move this function into {{{GenericBackend}}}.
Would this work for you?
>
> Some time ago I think the variables knew about their LP, but because the
LP also knew about the variables it produced a cyclic reference, and
Python had to be forced to deallocate the two elements -- I think we
removed that not so long ago, while dealing with Cliquer's many memory
leaks. Which are fixed in a patch, btw `:-)`
hmm, I thought that one just cannot have {{{__del__}}} in these classes,
and then they would be garbage-collected just fine...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13205#comment:10>
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