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Transportation Assignment and MinimumCost Flows
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algebraic algebraic notation amounts AMPL model AMPL's arith-expr arithmetic expression assignment assignment problem bands coils breakpoints Chapter CLEV columnwise constraints cost[i,j CPLEX D_CITY data statements data values default defined variables described destinations diet model DW_LINKS example expr flow FOOD formulation GARY indexed collection indexing expression indexing set integer programming inventory iterations keyword knapsack problem LAN WIN STL linear program logical conditions Make[p,t MAXREQ minimize total_cost MINOS MINREQ model of Figure nonlinear nonlinear programs objective function operator optimal solution found option ordered pairs ORIG,DEST packages pairs param cost param demand param supply parameter phrase piecewise-linear function PITT PITT bands printf problem production model profit represent Section set DEST set LINKS set ORIG set PROD set-expr sexpr shipments shipped solve solver specify STL FRE LAF string subset template tons Trans Trans[i,j Trans[i,j,p transportation model tuples vexpr week WIN STL FRE zero