lpmethod_cs.cs

/* Copyright 2022, Gurobi Optimization, LLC */ /* Solve a model with different values of the Method parameter; show which value gives the shortest solve time. */ using System; using Gurobi; class lpmethod_cs { static void Main(string[] args) { if (args.Length < 1) { Console.Out.WriteLine("Usage: lpmethod_cs filename"); return; } try { // Read model GRBEnv env = new GRBEnv(); GRBModel model = new GRBModel(env, args[0]); // Solve the model with different values of Method int bestMethod = -1; double bestTime = model.Parameters.TimeLimit; for (int i = 0; i <= 2; ++i) { model.Reset(); model.Parameters.Method = i; model.Optimize(); if (model.Status == GRB.Status.OPTIMAL) { bestTime = model.Runtime; bestMethod = i; // Reduce the TimeLimit parameter to save time // with other methods model.Parameters.TimeLimit = bestTime; } } // Report which method was fastest if (bestMethod == -1) { Console.WriteLine("Unable to solve this model"); } else { Console.WriteLine("Solved in " + bestTime + " seconds with Method: " + bestMethod); } // Dispose of model and env model.Dispose(); env.Dispose(); } catch (GRBException e) { Console.WriteLine("Error code: " + e.ErrorCode + ". " + e.Message); } } }