[Help-glpk] Re: unbounded ray

[Andrew Makhorin]

>After running lpx_simplex, if the objective is unbounded,
>is there a way to query for an unbounded ray or for the
>corresponding nonbasic variable?

It is funny, but currently there is no way to do that. I will add
corresponding routine in the next release to obtain the number of a
(non-basic) variable which causes unboundness. Knowing that variable
it is possible to compute the ray itself by using lpx_eval_tab_col.
However, if there is a need to have such routine right now, please
inform me, and I will post a patch to the mailing list.

Andrew Makhorin