fmincon优化问题求教。

fun = @(x)4.0896*x(1)*x(2);

lb=[];

ub=[];

A=[-1 0;0 1;0 -1];

b=[-30;150;-50];

Aeq=[];

beq=[];

x0=[20,50];

[x,fval,exitflag,output]=fmincon(fun,x0,A,b,Aeq,beq,lb,ub,'mycon')

以上是我的代码；

下面的是输出结果，红色部分的错误是什么意思？？？怎么解决呢？？

Local minimum found that satisfies the constraints.

Optimization completed because the objective function is non-decreasing in

feasible directions, to within the default value of the optimality tolerance,

and constraints are satisfied to within the default value of the constraint tolerance.

<stopping criteria details>

x =

30.0000 50.0000

fval =

6.1344e+03

exitflag =

1

output =

包含以下字段的 struct:

iterations: 6

funcCount: 21

constrviolation: 0

stepsize: 4.6603e-08

algorithm: 'interior-point'

firstorderopt: 1.6891e-06

cgiterations: 0

message: 'Local minimum found that satisfies the constr…'