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lpmethod_cs.cs
/* Copyright 2016, Gurobi Optimization, Inc. */ /* 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]); GRBEnv menv = model.GetEnv(); // Solve the model with different values of Method int bestMethod = -1; double bestTime = menv.Get(GRB.DoubleParam.TimeLimit); for (int i = 0; i <= 2; ++i) { model.Reset(); menv.Set(GRB.IntParam.Method, i); model.Optimize(); if (model.Get(GRB.IntAttr.Status) == GRB.Status.OPTIMAL) { bestTime = model.Get(GRB.DoubleAttr.Runtime); bestMethod = i; // Reduce the TimeLimit parameter to save time // with other methods menv.Set(GRB.DoubleParam.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); } } }