NASFAQ/maths/optimizer/trash/optimizer.cpp

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2022-05-07 14:49:43 +00:00
#include "optimizer.h"
namespace operations_research {
void BasicExample() {
// Create the linear solver with the GLOP backend.
std::unique_ptr<MPSolver> solver(MPSolver::CreateSolver("SCIP"));
if (!solver) {
LOG(WARNING) << "SCIP solver unavailable.";
return;
}
// Create the variables x and y.
MPVariable* const x = solver->MakeIntVar(0.0, 1, "x");
MPVariable* const y = solver->MakeIntVar(0.0, 2, "y");
LOG(INFO) << "Number of variables = " << solver->NumVariables();
// Create a linear constraint, 0 <= x + y <= 2.
MPConstraint* const ct = solver->MakeRowConstraint(0.0, 2.0, "ct");
ct->SetCoefficient(x, 1);
ct->SetCoefficient(y, 1);
LOG(INFO) << "Number of constraints = " << solver->NumConstraints();
// Create the objective function, 3 * x + y.
MPObjective* const objective = solver->MutableObjective();
objective->SetCoefficient(x, 3);
objective->SetCoefficient(y, 1);
objective->SetMaximization();
solver->Solve();
LOG(INFO) << "Solution:" << std::endl;
LOG(INFO) << "Objective value = " << objective->Value();
LOG(INFO) << "x = " << x->solution_value();
LOG(INFO) << "y = " << y->solution_value();
}
} // namespace operations_research