bilinear_vb.vb.
'版权所有2019，Gurobi优化狗万app足彩，LLC * /'此示例制定并解决以下简单的双线性模型：'最大化x'对x + y + z <= 10'x * y <= 2（双线性不等式）'x* z + y * z == 1（双线性相等）'x，y，z非负（x积分在第二版中）导入gurobi类bilinear_vb共享子main（）尝试将Dimen Env作为新的Grbenv（“bilinear.log”）昏暗的模型作为新的grbmodel（env）'创建变量暗淡x作为grbvar = model.addvar（0，grb.invinity，0，grb.continuous，“x”）暗y为grbvar = model.advar（0，grb。Infinity，0，Grb.Continuous，“Y”）Dim Z为GRBVAR = Model.Addvar（0，Grb.invinity，0，Grb.Conured，“Z”）'将目标Dim Obj设置为GrblineXPR = X Model.setObjective（obj，grb.maximize）'添加线性约束：x + y + z <= 10 model.addconstr（x + y + z <= 10，“c0”）'添加双线性不等式：x * y <= 2 model.addqconstr（x * y <= 2，“bilinear0”）'添加双线性平等：x * z + y * z == 1 model.addqconstr（x * z + y * z = 1，“bilinear1”）'优化modEL TRY MODEM.OPTIMIZE（）捕获e作为grbException console.writeline（“失败（按预期）”）结束尝试模型.set（grb.intparam.nonconvex，2）model.optimize（）console.writeline（x.varname＆" " & x.X) Console.WriteLine(y.VarName & " " & y.X) Console.WriteLine(z.VarName & " " & z.X) Console.WriteLine("Obj: " & model.ObjVal & " " & obj.Value) x.Set(GRB.CharAttr.VType, GRB.INTEGER) model.Optimize() Console.WriteLine(x.VarName & " " & x.X) Console.WriteLine(y.VarName & " " & y.X) Console.WriteLine(z.VarName & " " & z.X) Console.WriteLine("Obj: " & model.ObjVal & " " & obj.Value) ' Dispose of model and env model.Dispose() env.Dispose() Catch e As GRBException Console.WriteLine("Error code: " & e.ErrorCode & ". " & e.Message) End Try End Sub End Class
