#18838: GLPK backend does not detect unboundedness in simplex-only mode
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Reporter: mkoeppe | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: numerical | Resolution:
Keywords: lp | Merged in:
Authors: Matthias Koeppe, | Reviewers: Dima Pasechnik, David
Yuan Zhou | Coudert
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/yzh/glpk_backend_does_not_detect_unboundedness_in_simplex_only_mode|
6e680f9b7f276182fc898a1f07238be80aa34bed
Dependencies: | Stopgaps:
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Comment (by yzh):
Thanks for your remarks.
> - Why are you removing `GLP_EOPFS` and `GLP_EODFS` ? (I don't know the
meaning of these variables)
I remove `GLP_EOPFS` and `GLP_EODFS` because they are misspelled. They
should be:
`GLP_ENOPFS`: "The LP (relaxation) problem has no primal feasible
solution";
`GLP_ENODFS`: "The LP (relaxation) problem has no dual feasible solution",
> - {{{This algorithm can be requested explicitly by setting the solver
parameter "simplex_or_intopt" to "intopt_only".}}} The example following
this statement does not examplify it. Where are you setting the solver
parameter?
'glp_inopt' is the default value for the solver parameter
`simplex_or_intopt`, unless all variables are continuous.
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Ticket URL: <http://trac.sagemath.org/ticket/18838#comment:39>
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