例子Mip1.java

这是我们示例的完整源代码(也可以在< installdir > / / java / Mip1.java例子)…
/*该示例公式并求解以下简单的MIP模狗万app足彩型:maximize x + y + 2z subject to x + 2y + 3z <= 4 x + y >= 1 x, y, z binary */ import Gurobi .*;public class Mip1 {public static void main(String[] args) {try{//创建空环境，设置选项，并启动GRBEnv env = new GRBEnv(true);env。设置(“记录文件”、“mip1.log”);env.start ();//创建空模型GRBModel model = new GRBModel(env);//创建变量GRBVar x = model.addVar(0.0, 1.0, 0.0, GRB.)二、“x”);GRBVar y = model.addVar(0.0, 1.0, 0.0, GRB.)二、“y”);GRBVar z = model.addVar(0.0, 1.0, 0.0, GRB.)二、“z”);//设置目标:最大化x + y + 2z GRBLinExpr expr = new GRBLinExpr(); expr.addTerm(1.0, x); expr.addTerm(1.0, y); expr.addTerm(2.0, z); model.setObjective(expr, GRB.MAXIMIZE); // Add constraint: x + 2 y + 3 z <= 4 expr = new GRBLinExpr(); expr.addTerm(1.0, x); expr.addTerm(2.0, y); expr.addTerm(3.0, z); model.addConstr(expr, GRB.LESS_EQUAL, 4.0, "c0"); // Add constraint: x + y >= 1 expr = new GRBLinExpr(); expr.addTerm(1.0, x); expr.addTerm(1.0, y); model.addConstr(expr, GRB.GREATER_EQUAL, 1.0, "c1"); // Optimize model model.optimize(); System.out.println(x.get(GRB.StringAttr.VarName) + " " +x.get(GRB.DoubleAttr.X)); System.out.println(y.get(GRB.StringAttr.VarName) + " " +y.get(GRB.DoubleAttr.X)); System.out.println(z.get(GRB.StringAttr.VarName) + " " +z.get(GRB.DoubleAttr.X)); System.out.println("Obj: " + model.get(GRB.DoubleAttr.ObjVal)); // Dispose of model and environment model.dispose(); env.dispose(); } catch (GRBException e) { System.out.println("Error code: " + e.getErrorCode() + ". " + e.getMessage()); } } }