#19523: Adding constraints for the wrong MILP crashes Sage
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.10
Component: linear programming | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #19525 | Stopgaps:
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Comment (by mkoeppe):
Then I strongly prefer to always raise an error in this situation. This
requires changes to `LinearFunction` (a class that is I think only used in
the context of `MixedIntegerLinearProgram`), so that it remembers the MIP
that it relates to.
The mapping from MIP variables (and their indexed components) to integer
indices (designating backend columns) is determined dynamically, adding a
backend column when a MIP variable component is accessed.
Because of this there's simply no good way to write correct code that
interchanges MIP variables, or to use `LinearFunction`s directly, between
two `MixedIntegerLinearProgram`s.
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Ticket URL: <http://trac.sagemath.org/ticket/19523#comment:11>
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