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Re: [Help-glpk] need help for the routine glp_intopt

From: Andrew Makhorin
Subject: Re: [Help-glpk] need help for the routine glp_intopt
Date: Fri, 09 Sep 2011 15:12:10 +0400

> I'm a student at Paris Dauphine University and i'm using GLPK to solve
> MIP problems (as part of my master thesis : Operational Research and
> Decision Aiding). 
> When i solve my MIP problem with these two basic API Routines :
> glp_simplex(mip, NULL);
> glp_intopt(mip, NULL);
> this message is shown on the screen:
> OPTIMAL SOLUTION FOUND (Optimal solution to LP rekaxation)
> other comments...
> The problem is the fact that this optimal integer solution is not
> integer
> Any help or idea?

Most probably you are using the routine glp_get_col_prim and
glp_get_row_prim which report components of the solution to lp
relaxation. To obtain mip solution components you should use
glp_mip_col_val, glp_mip_row_val, and glp_mip_obj_val. 

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