\$title execute_loadpoint: save point - clear - loadpoint - reoptimize (SAVEP1,SEQ=65) Sets i canning plants / seattle, san-diego / j markets / new-york, chicago, topeka / ; Parameters a(i) capacity of plant i in cases / seattle 350 san-diego 600 / b(j) demand at market j in cases / new-york 325 chicago 300 topeka 275 / ; Table d(i,j) distance in thousands of miles new-york chicago topeka seattle 2.5 1.7 1.8 san-diego 2.5 1.8 1.4 ; Scalar f freight in dollars per case per thousand miles /90/ ; Parameter c(i,j) transport cost in thousands of dollars per case ; c(i,j) = f * d(i,j) / 1000 ; Variables x(i,j) shipment quantities in cases z total transportation costs in thousands of dollars ; Positive Variable x ; Equations cost define objective function supply(i) observe supply limit at plant i demand(j) satisfy demand at market j ; cost .. z =e= sum((i,j), c(i,j)*x(i,j)) ; supply(i) .. sum(j, x(i,j)) =l= a(i) ; demand(j) .. sum(i, x(i,j)) =g= b(j) ; Model transport /all/ ; transport.savepoint=1; option lp=bdmlp,limrow=0,limcol=0; x.up(i,j) = 300; Solve transport using lp minimizing z ; option clear=z,clear=cost,clear=supply,clear=demand; x.l(i,j) = 0; x.m(i,j) = 0; execute_loadpoint 'transport_p'; Solve transport using lp minimizing z ; abort\$(transport.solvestat <> %solvestat.NormalCompletion% or transport.modelstat <> %modelstat.Optimal% or transport.iterusd <> 0 ) 'something really wrong';