Re: [Help-glpk] glpksol default settings

[Marcin Mucha]

> Probably this happens because your instance is not well conditioned,
> so due to excessive round-off errors the presolved lp is unbounded
> while the original lp is not.
What does "not well conditioned" mean? What can I do about it?

>
>>  Also neither lpx_adv_basis nor lpx_std_basis
>> seem to solve the problem from C++ API level. Could anyone please tell
>> me what I am missing here?
>
> Could you provide the code returned by glp_simplex?
I'm getting

PROBLEM HAS UNBOUNDED SOLUTION
glp_simplex: cannot recover undefined or non-optimal solution

and glp_simplex returns 11, i.e.  GLP_ENODFS (no dual feasible)

Marcin