Hello Robin, you cannot have "and" in a constraint.
Use two constraints. Best regards Heinrich Schuchardt http://www.xypron.de Am 28.06.13 um 03:24 schrieb robin hankin > hello, v4.51, macosx 10.8.3 > > > > > > > > Please help me, I have a problem and have boiled it down to the following > > .mod file which exibits the error I am struggling with: > > > > wt118:~/Dropbox/glpk/alice_puzzle% > > wt118:~/Dropbox/glpk/alice_puzzle% cat doesnotwork.mod > > var x1, integer; > > var x2, integer; > > var x3, integer; > > > > s.t. ss: (x1 >= x2) and (x2 >= x3); > > > > > > solve; > > end; > > wt118:~/Dropbox/glpk/alice_puzzle% glpsol -m doesnotwork.mod > > GLPSOL: GLPK LP/MIP Solver, v4.51 > > Parameter(s) specified in the command line: > > -m doesnotwork.mod > > Reading model section from doesnotwork.mod... > > doesnotwork.mod:5: operand preceding >= has invalid type > > Context: ...er ; var x2 , integer ; var x3 , integer ; s.t. ss : ( x1 >= > > MathProg model processing error > > wt118:~/Dropbox/glpk/alice_puzzle% > > > > > > > > what is wrong with my doesnotwork.mod file? What is wrong with my 'ss' > > constraint? > > > > thanks in advance > > > > > > > > -- > > Robin Hankin > > Uncertainty Analyst > > [email protected] _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
