\$title Testing put_utility solver (PUT12,SEQ=776) \$onText The put_utility solver allows to select a solver by name during execution type. One can specify the model type or use '*' to set the solver for all suitable model types Contributor: Michael Bussieck, August 2018 \$offText Set i 'canning plants' / seattle, san-diego / j 'markets' / new-york, chicago, topeka /; Parameter 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; Variable x(i,j) 'shipment quantities in cases' z 'total transportation costs in thousands of dollars'; Positive Variable x; Equation 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 /; Scalar cplexID, bdmlpID; put_utility 'solver' / 'lp' / 'cplex'; solve transport using lp minimizing z; cplexID = transport.sysIdent; put_utility 'solver' / 'lp' / 'bdmlp'; solve transport using lp minimizing z; bdmlpID = transport.sysIdent; abort\$(cplexID=bdmlpID) 'used the same solver', cplexID, bdmlpID; put_utility 'solver' / '*' / 'cplex'; solve transport using rmip minimizing z; cplexID = transport.sysIdent; put_utility 'solver' / '*' / 'bdmlp'; solve transport using rmip minimizing z; bdmlpID = transport.sysIdent; abort\$(cplexID=bdmlpID) 'used the same solver with model type=*', cplexID, bdmlpID;;