Re: [Help-glpk] Simplex in GLPK and CPLEX in GAMS

[Andrew Makhorin]

On Tue, 2015-11-24 at 10:11 +0100, Yaser Tohidi wrote:
> Hi
> 
> 
> Thanks for your email. This is the result I get:

Your lp is badly scaled, so I suggest to use the following sequence:

   glp_scale_prob(lps12, GLP_SF_AUTO);
   glp_adv_basis(lps12, 0);
   glp_simplex(lps12, NULL);

For more details please see the glpk reference manual
(glpk/doc/glpk.pdf) included in the distribution tarball.

> Can this be because of having simplex v4.55 instead of v4.57?

Maybe.

> Please let me know how to upgrade that.

See
http://www.gnu.org/software/glpk/#downloading
http://en.wikibooks.org/wiki/GLPK

> Also, please let me know which line you are referring by "Your code is
> wrong because GLP_OPT is defined as 5."
> 
> 

Change the line

   if (glp_get_status(lps12) > 2){

to something like this:

   if (glp_get_status(lps12) != GLP_OPT){

If you have further questions please subscribe to the help-glpk list 
http://lists.gnu.org/mailman/listinfo/help-glpk and post your questions
there. Thanks.


Andrew Makhorin