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lpmethod_c++.cpp
/* Copyright 2016, Gurobi Optimization, Inc. */ /* Solve a model with different values of the Method parameter; show which value gives the shortest solve time. */ #include "gurobi_c++.h" using namespace std; int main(int argc, char *argv[]) { if (argc < 2) { cout << "Usage: lpmethod_c++ filename" << endl; return 1; } try { // Read model GRBEnv env = GRBEnv(); GRBModel m = GRBModel(env, argv[1]); // Solve the model with different values of Method int bestMethod = -1; double bestTime = m.get(GRB_DoubleParam_TimeLimit); for (int i = 0; i <= 2; ++i) { m.reset(); m.set(GRB_IntParam_Method, i); m.optimize(); if (m.get(GRB_IntAttr_Status) == GRB_OPTIMAL) { bestTime = m.get(GRB_DoubleAttr_Runtime); bestMethod = i; // Reduce the TimeLimit parameter to save time // with other methods m.set(GRB_DoubleParam_TimeLimit, bestTime); } } // Report which method was fastest if (bestMethod == -1) { cout << "Unable to solve this model" << endl; } else { cout << "Solved in " << bestTime << " seconds with Method: " << bestMethod << endl; } } catch(GRBException e) { cout << "Error code = " << e.getErrorCode() << endl; cout << e.getMessage() << endl; } catch(...) { cout << "Exception during optimization" << endl; } return 0; }