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Use itertools.product() instead of nested for-loops #2

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Use itertools.product() instead of nested for-loops #2

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5 changes: 4 additions & 1 deletion 04_TransportProblem.ipynb
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Expand Up @@ -303,8 +303,11 @@
"# cost .. z =e= sum((i,j), c(i,j)*x(i,j)) ;\n",
"# Model transport /all/ ;\n",
"# Solve transport using lp minimizing z ;\n",
"#\n",
"# itertools.product() returns the Cartesian product of two or more iterables\n\n",
"import itertools\n",
"def objective_rule(model):\n",
" return sum(model.c[i,j]*model.x[i,j] for i in model.i for j in model.j)\n",
" return sum(model.c[i,j]*model.x[i,j] for i, j in itertools.product(model.i, model.j))\n",
"\n",
"model.objective = Objective(rule=objective_rule, sense=minimize, doc='Define objective function')"
]
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