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Update stigler_diet example (C++, Python)

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This commit is contained in:
Corentin Le Molgat
2018-10-12 13:43:37 +02:00
parent f6ec77d4ef
commit ac42c57a8e
4 changed files with 178 additions and 13 deletions
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24
examples/cpp/stigler_diet.cc
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@@ -250,6 +250,9 @@ void RunStiglerDietExample() {
}
}
LOG(INFO) << "Number of variables = " << solver.NumVariables();
LOG(INFO) << "Number of constraints = " << solver.NumConstraints();
// Solve!
const MPSolver::ResultStatus result_status = solver.Solve();
// Check that the problem has an optimal solution.
@@ -262,32 +265,27 @@ void RunStiglerDietExample() {
}
return;
}
LOG(INFO) << "Optimal Solution:";
// Display the amounts (in dollars) to purchase of each food.
double price = 0.0;
std::vector<double> nutrients_result(nutrients.size());
LOG(INFO) << "";
LOG(INFO) << "Menu:";
LOG(INFO) << "Annual Foods:";
for (std::size_t i = 0; i < data.size(); ++i) {
price += food[i]->solution_value();
if (food[i]->solution_value() > 0.0) {
LOG(INFO) << data[i].name << ": $" << 365. * food[i]->solution_value();
}
for (std::size_t j = 0; j < nutrients.size(); ++j) {
nutrients_result[j] += data[i].nutrients[j] * food[i]->solution_value();
}
if (food[i]->solution_value() > 0.0) {
LOG(INFO) << data[i].name << " = " << food[i]->solution_value();
}
}
LOG(INFO) << "";
LOG(INFO) << "Nutrients:";
LOG(INFO) << "Optimal annual price: $" << 365. * objective->Value();
LOG(INFO) << "";
LOG(INFO) << "Nutrients per day:";
for (std::size_t i = 0; i < nutrients.size(); ++i) {
LOG(INFO) << nutrients[i].first << ": " << nutrients_result[i] << " (min "
<< nutrients[i].second << ")";
}
LOG(INFO) << "";
LOG(INFO) << "Optimal annual price: " << 365 * price << "cents";
LOG(INFO) << "";
LOG(INFO) << "Advanced usage:";
LOG(INFO) << "Problem solved in " << solver.wall_time() << " milliseconds";
LOG(INFO) << "Problem solved in " << solver.iterations() << " iterations";