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params_cs.cs
/* Copyright 2018, Gurobi Optimization, LLC */ /* Use parameters that are associated with a model. A MIP is solved for a few seconds with different sets of parameters. The one with the smallest MIP gap is selected, and the optimization is resumed until the optimal solution is found. */ using System; using Gurobi; class params_cs { static void Main(string[] args) { if (args.Length < 1) { Console.Out.WriteLine("Usage: params_cs filename"); return; } try { // Read model and verify that it is a MIP GRBEnv env = new GRBEnv(); GRBModel m = new GRBModel(env, args[0]); if (m.IsMIP == 0) { Console.WriteLine("The model is not an integer program"); Environment.Exit(1); } // Set a 2 second time limit m.Parameters.TimeLimit = 2.0; // Now solve the model with different values of MIPFocus GRBModel bestModel = new GRBModel(m); bestModel.Optimize(); for (int i = 1; i <= 3; ++i) { m.Reset(); m.Parameters.MIPFocus = i; m.Optimize(); if (bestModel.MIPGap > m.MIPGap) { GRBModel swap = bestModel; bestModel = m; m = swap; } } // Finally, delete the extra model, reset the time limit and // continue to solve the best model to optimality m.Dispose(); bestModel.Parameters.TimeLimit = GRB.INFINITY; bestModel.Optimize(); Console.WriteLine("Solved with MIPFocus: " + bestModel.Parameters.MIPFocus); } catch (GRBException e) { Console.WriteLine("Error code: " + e.ErrorCode + ". " + e.Message); } } }