Hello Greg, I tested with examples/transp.mod;
I can confirm, the following causes an error: display supply['Seattle'].dual; printf supply['Seattle'].dual; works fine. I will have a look what needs to changed in my patch. Hopefully Andrew will at some time put support for outputting duals into the official release. Best regards Xypron -------- Original-Nachricht -------- > Datum: Sat, 1 May 2010 23:58:41 -0400 > Von: Greg Gruber <[email protected]> > An: [email protected] > Betreff: [Help-glpk] Re: Help-glpk Digest, Vol 90, Issue 1 > Hello, > I have a column-generation problem I'm trying to switch over from > AMPL/CPLEX > to GLPK, and it would be useful to be able to display the dual values in > MathProg. I know that suffixes are not supported in the official release, > but I saw the following: > > An unofficial patched version of a last year GLPK release can be > > checked out with subversion > > > > svn co http://glpk.dyndns.org/svn/glpk/branches/glpk-4.38-dot/ > > > > It supports the following suffixes in the post solution phase: > > > > variables > > lb - lower bound > > ub - upper bound > > val - value > > dual - dual value > > basic - 1 if variable is basic > > > > constraints > > lb - lower bound > > ub - upper bound > > dual - dual value > > value - value > > > > > I downloaded this version using "vn co > http://glpk.dyndns.org/svn/glpk/branches/glpk-4.38-dot/"; then compiled it > (configure, make, make install). The compile appears successful, and when > I > check the date/timestamp on my glpsol, it shows the current date/time. > When > I try to use the ".dual" functionality as follows: > > "display summation_constraint.dual;" > > I get an error message: > > "Reading model section from test_cur1_2.mod... > test_cur1_2.mod:67: invalid reference to constraint summation_constraint > Context: ...f MaxCHarn >> '...' ; solve ; display summation_constraint . > GLPK: model processing error" > > Did I download the correct version? > > Thanks, > Greg -- 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
