params_vb.vb
“版权所有2019,Gurobi O狗万app足彩ptimization, LLC */”使用与模型相关的参数。”一个MIP可以用不同的参数组在几秒钟内求解出来。”选择MIP间隙最小的那个，继续进行优化，直到找到最优解。导入系统导入Gurobi类params_vb共享子Main(args As String())Length < 1 Then Console.Out。WriteLine("Usage: params_vb filename")返回结束如果尝试'读取模型并验证它是一个MIP Dim env As New GRBEnv() Dim m As New GRBModel(env, args(0))如果m.s imip = 0那么Console. ismip = 0。WriteLine(“不是一个整数规划模型”)Environment.Exit(1)如果设置一个2秒时间限制m.Parameters.TimeLimit = 2.0现在解决MIPFocus昏暗的模型和不同的价值观bestModel新GRBModel (m) bestModel.Optimize()因为我如integer = 1到3 m.Reset () m.Parameters.MIPFocus =我m.Optimize如果bestModel()。MIPGap > m.MIPGap Then Dim swap As GRBModel = bestModel bestModel = m m = swap结束如果Next '最后，删除多余的模型，重置时间限制，并继续求解最佳模型到最优。m. dispose () bestModel. parameters . timelimit = GRB。∞bestModel.Optimize()控制台。Catch e As GRBException Console. Catch e As GRBException Console. Catch e As GRBException Console. Catch e As GRBException Console. Catch e As GRBException Console. Catch eWriteLine("错误代码:" + e.ErrorCode & "。+ e.Message)结束尝试结束子结束类
