Hello Ali, See as example function glp_mpl_postsolve() in http://glpk.dyndns.org/viewvc/svn/glpk/branches/glpk-4.38-dot/src/glpapi16.c?revision=1&view=markup
Best regards Xypron -------- Original-Nachricht -------- > Datum: Fri, 11 Jun 2010 15:51:52 +0200 > Betreff: Re: [Help-glpk] Re: XyPron: shadow prices in MIP problem > No, it is not. > > Could you please send us your code so we have the chance to help? > > Ali > > On Fri, Jun 11, 2010 at 10:41 AM, Fabio <[email protected]> wrote: > > Is it normal that solving the problem again with fixed integer variables > at > > the optimal values takes nearly as long as solving the original problem? > > (76sec vs. 72sec) > > > > The problem has: > > 34536 rows, 34512 columns, 86232 non-zeros > > 17256 integer variables, all of which are binary > > On May 31, 2010, at 11:33 AM, Andrew Makhorin <[email protected]> wrote: > > > >> Just a follow-up question to the original question (dual values for > >> the continious values in a mixed integer problem): > > > >> So I basically have to solve the problem again but with fixed > >> integer values taken from the MIP solution. For the java interface > >> this means: > >> - retrieve the solutions of the integer variables > >> - delete old problem (MIP) > >> - create new problem (LP, old integer vars are fixed) > >> - solve again > > > >> Or is there a better way? > > > > You don't need to destroy the old problem object. Just fix integer > > variables at the optimal values found by the mip solver and call the > > simplex solver. > > > > > > _______________________________________________ > > Help-glpk mailing list > > [email protected] > > http://lists.gnu.org/mailman/listinfo/help-glpk > > > > > > _______________________________________________ > Help-glpk mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/help-glpk -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01 _______________________________________________ Help-glpk mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-glpk
