Hello Sascha, your mail had to be forwarded manually because you are not subscribed to the GLPK help list, cf. https://lists.gnu.org/mailman/listinfo/help-glpk
Looking at the code in src/glpkapi09.c and glpapi13.c the documentation is wrong. The problem accessible in the MIP callback is the presolved and scaled problem. So if you have a heuristic solution expressed in your original variables you should switch off presolving and scaling. When presolving and scaling is switched off you could use glp_create_index and glp_find_col to identify the column numbers to be used when specifying the solution. Best regards Heinrich Schuchardt On 01/12/2016 01:12 PM, Andrew Makhorin wrote: > -------- Forwarded Message -------- > From: Sascha Brügmann <sascha.bruegm...@googlemail.com> > To: help-glpk@gnu.org > Subject: glp_intopt conversion of solutions via callback > Date: Mon, 11 Jan 2016 22:05:35 +0100 > > Hi, > I use GLPKs glp_intopt. As I always have an (mostly non-optimal) > feasible solution to all of my problem-LPs I need a way to inject these > initial solutions. I've tried the callback-way like described > here https://lists.gnu.org/archive/html/help-glpk/2012-02/msg00031.html. > > > Question 1: Documentation for GLPK 4.57 chapter "5.2.7 glp_ios_heur_sol" > talks about 'original problem' such that one can think > that glp_ios_heur_sol accepts a solution for the non-preprocessed-mip > which is then converted to preprocessed-mip automatically. This > contrasts to what has been written on the upper link i've posted. Who is > right? > > > Question 2: If glp_ios_heur_sol requires the provided solution in > presolved-mip-format, how can I convert a solution from > non-presolved-mip-format (the original LP-problem) > to presolved-mip-format? > > > Thanks > > > > _______________________________________________ > Help-glpk mailing list > Help-glpk@gnu.org > https://lists.gnu.org/mailman/listinfo/help-glpk > _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org https://lists.gnu.org/mailman/listinfo/help-glpk
