\$Title Solving a Transportation Problem using Cplex remote server (RS01,SEQ=611) \$Ontext We solve the trnsport model using the Cplex remote server. The information about the server addresses, ports and password come through the environment variable CPXRS \$Offtext \$echo computeserver %sysenv.CPXRS% > cplexd.opt 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.optfile=1; \$ifthen %system.buildcode% == SOX * On Sparc Solaris the system can't find some shared objects required for the Cplex remote object. * Hence, we need to set things explictely and make sure the LD_LIBRARY_PATH environment is not * forgotten when we call the solver. \$setenv LD_LIBRARY_PATH %gams.sysdir%:%sysenv.LD_LIBRARY_PATH% transport.solvelink = %solvelink.CallScript%; \$endif option lp=cplexd; Solve transport using lp minimizing z ; abort\$(transport.modelstat<>1 or transport.solvestat<>1) 'Bad model/solvestatus', transport.modelstat, transport.solvestat; abort\$(abs(z.l-153.675)>1e-4) 'Bad z.l', z.l;