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Loading and cutting problems

Description
Problem name and type, featuresDifficultyRelated examples
D‑1 Wagon load balancing: Nonpreemptive scheduling on parallel machines ****
heuristic solution requiring sorting algorithm, formulation of maximin objective; nested subroutines: function returning heuristic solution value and sorting procedure, ceil, getsize, if-then, break, exit, all loop types (forall-do, repeat-until, while-do), setparam, qsort, cutoff value, loading a MIP start solution
D‑2 Barge loading: Knapsack problem ** burglar1.mos, knapsack_graph.mos
incremental problem definition with 3 different objectives, procedure for solution printing
D‑3 Tank loading: Loading problem ***
2 objectives; data preprocessing, as, dynamic creation of variables, procedure for solution printing, if-then-else
D‑4 Backing up files: Bin-packing problem ** binpacking_graph.mos
2 versions of mathematical model, symmetry breaking; data preprocessing, ceil, range
D‑5 Cutting sheet metal: Covering problem * g6transmit.mos, j2bigbro.mos
D‑6 Cutting steel bars for desk legs: Cutting-stock problem ** cutstock_graph.mos
set operation(s) on range sets, set of integer (data as set contents)


Further explanation of this example: 'Applications of optimization with Xpress-MP', Chapter 9: Loading and cutting stock problems

mosel_app_4.zip[download all files]

Source Files

Data Files





d2ship.dat

! Data file for `d2ship.mos'

AVAIL: [12 31 20 25 50 40 60]

SIZE:  [10  8  6  9 15 10 12]

PRICE: [1000 600 600 800 1200 800 1100]

COST:  [80 70 85 80 73 70 80]

CAP: 1500

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