Well, I don't know what you mean exactly but setting parm.presolve = ON is never NECESSARY! (It is necessary only if you don't want to use glp_simplex before glp_intopt). If you don't use it, my suggestion is to use glp_simplex before glp_intopt and disable parm.presolve. In this case, if the integer solution found is incorrect means that the solution you pass is incorrect.
2013/8/6 Le Dinh Danh <[email protected]> > Hi G.S, > It is neccesary to set parm.presolve=ON before solving MIP. In fact, I've > tried with parm.presolve=OFF but the results are always 0. Anyway, thank > you. > > > On Mon, Aug 5, 2013 at 5:34 PM, Giorgio Sartor <[email protected]> wrote: > >> Ok. Just try parm.presolve=OFF and let me know if then works. >> >> >> - G. S. - >> >> Il giorno 05/ago/2013, alle ore 16:51, Le Dinh Danh <[email protected]> >> ha scritto: >> >> Hi Giorgio Sartor, >> >> On Mon, Aug 5, 2013 at 4:14 PM, Giorgio Sartor <[email protected]>wrote: >> >>> Is glp_iocp.presolve activated? >>> >> Yes, I have already set parm.presolve = ON. >> >>> A common cause of incorrect solutions is that your solution is correct >>> for the original problem but not correct for the current problem (which >>> could have been modified by GLPK during the solving process). >>> Stupid question: does your solution start from position 1 of the array? >>> >> Yes, of course. >> >>> >>> - G. S. - >>> >>> Il giorno 05/ago/2013, alle ore 14:58, Le Dinh Danh <[email protected]> >>> ha scritto: >>> >>> With "the result is still incorrect" I mean after calling the callback >>> function, the solver find the solution but it is not correct one. I don't >>> know why. If I don't call the cacllback, the solve provide a good solution. >>> I can check it manually. >>> >>> >>> On Mon, Aug 5, 2013 at 1:19 PM, Giorgio Sartor <[email protected]>wrote: >>> >>>> What do you mean with "the result is still incorrect"? >>>> >>>> >>>> - G. S. - >>>> >>>> Il giorno 05/ago/2013, alle ore 12:57, Le Dinh Danh <[email protected]> >>>> ha scritto: >>>> >>>> > the result is still incorrect. >>>> >>> >>> >>> >>> -- >>> Le Dinh Danh >>> LIRMM, 161 rue Ada, 34095 Montpellier Cedex 5 >>> Email: [email protected]; [email protected] >>> Tel: (+84) 912.449.666; (+33) 6.52.98.59.66 >>> >>> >> >> >> -- >> Le Dinh Danh >> LIRMM, 161 rue Ada, 34095 Montpellier Cedex 5 >> Email: [email protected]; [email protected] >> Tel: (+84) 912.449.666; (+33) 6.52.98.59.66 >> >> > > > -- > Le Dinh Danh > LIRMM, 161 rue Ada, 34095 Montpellier Cedex 5 > Email: [email protected]; [email protected] > Tel: (+84) 912.449.666; (+33) 6.52.98.59.66 > >
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