params_cs.cs
/*版权所有2023,Gurobi O狗万app足彩ptimization, LLC */ /*使用与模型相关的参数。一个MIP可以用不同的参数集求解几秒钟。选择MIP间隙最小的，继续优化，直到找到最优解为止。*/使用系统;使用Gurobi;class params_cs {static void Main(string[] args) {if (args. js) {长度< 1){Console.Out。WriteLine("Usage: params_cs filename");返回;} try{//读取模型并验证它是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); // Clean up bestModel and environment bestModel.Dispose(); env.Dispose(); } catch (GRBException e) { Console.WriteLine("Error code: " + e.ErrorCode + ". " + e.Message); } } }
