qp_c + + . cpp
/ * 2021年版权,Gurobi优狗万app足彩化,LLC * / / *本例制定和解决以下简单的QP模型:最小化x ^ 2 + x * y + y ^ 2 + y * z + z ^ 2 + 2 x, x + 2 + 3 z > = 4 x + y > = 1 x, y, z非负它解决它曾经作为一个连续的模式,一旦为整数模型。*/ #include "gurobi_c++.h" using namespace std;int main(int argc, char *argv[]) {try {GRBEnv env = GRBEnv();GRBModel = GRBModel(env);//创建变量GRBVar x = model.addVar(0.0, 1.0, 0.0, GRB_CONTINUOUS， "x");GRBVar y = model.addVar(0.0, 1.0, 0.0, GRB_CONTINUOUS， "y");GRBVar z = model.addVar(0.0, 1.0, 0.0, GRB_CONTINUOUS， "z");//设置目标函数GRBQuadExpr = x*x + x*y + y*y + y*z + z*z + 2*x;model.setObjective (obj);//添加约束:x + 2 y + 3 z >= 4模型。addConstr(x + 2 * y + 3 * z >= 4， "c0"); // Add constraint: x + y >= 1 model.addConstr(x + y >= 1, "c1"); // Optimize model model.optimize(); cout << x.get(GRB_StringAttr_VarName) << " " << x.get(GRB_DoubleAttr_X) << endl; cout << y.get(GRB_StringAttr_VarName) << " " << y.get(GRB_DoubleAttr_X) << endl; cout << z.get(GRB_StringAttr_VarName) << " " << z.get(GRB_DoubleAttr_X) << endl; cout << "Obj: " << model.get(GRB_DoubleAttr_ObjVal) << endl; // Change variable types to integer x.set(GRB_CharAttr_VType, GRB_INTEGER); y.set(GRB_CharAttr_VType, GRB_INTEGER); z.set(GRB_CharAttr_VType, GRB_INTEGER); // Optimize model model.optimize(); cout << x.get(GRB_StringAttr_VarName) << " " << x.get(GRB_DoubleAttr_X) << endl; cout << y.get(GRB_StringAttr_VarName) << " " << y.get(GRB_DoubleAttr_X) << endl; cout << z.get(GRB_StringAttr_VarName) << " " << z.get(GRB_DoubleAttr_X) << endl; cout << "Obj: " << model.get(GRB_DoubleAttr_ObjVal) << endl; } catch(GRBException e) { cout << "Error code = " << e.getErrorCode() << endl; cout << e.getMessage() << endl; } catch(...) { cout << "Exception during optimization" << endl; } return 0; }
