Re: [Help-glpk] how to compute dual extreme ray

2009-08-20 Thread Andrew Makhorin
> I try to use #39;glpk #39; to find #39;certificate of primal > infeasibility #39; as outlined in the paper > Safe bounds in linear and mixed-integer programming > (http://www.optimization-online.org/DB_HTML/2002/06/494.html) > Section 4, eq.(12), (13), (14). > I found some discussion ab

Re: [Help-glpk] Objective value returns even though dual infeasibility is reported

2009-08-20 Thread Andrew Makhorin
> I'm using Flux Variability Analysis to understand how a metabolic > network may change under different conditions. I'm using glpk, and > for all of the reactions, I am able to get an objective value. For > some of the reactions, glpk reports that the primal solution is > unbounded because the d

Re: [Help-glpk] Objective value returns even though dual infeasibility is reported

2009-08-20 Thread Michael Hennebry
On Thu, 20 Aug 2009, Sam Seaver wrote: I'm using Flux Variability Analysis to understand how a metabolic network may change under different conditions. I'm using glpk, and for all of the reactions, I am able to get an objective value. For some of the reactions, glpk reports that the primal sol

[Help-glpk] Objective value returns even though dual infeasibility is reported

2009-08-20 Thread Sam Seaver
Dear all, I'm using Flux Variability Analysis to understand how a metabolic network may change under different conditions. I'm using glpk, and for all of the reactions, I am able to get an objective value. For some of the reactions, glpk reports that the primal solution is unbounded because the