Re: [Help-glpk] Getting more info from presolver

[Andrew Makhorin]

> I have tested the suggestion concerning glpsol -o for a trivial
> example with glpk-4.28:

> var x;
> var y;
> minimize obj : x + y;
> s.t. c0 : x + 3 * y >= 0;
> s.t. c4 : y <= 10;
> s.t. c1 : x + 4 <= 0;
s.t. c2 : x + 3 >>= 0;

> A line "KKT.PB" was not issued.

This is because you did not disable the lp presolver. It cannot
recover non-optimal solutions, so the solution of the original instance
remains undefined.