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世纪乘风

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[求助] 使用fmincon求解老出错,非线性优化

各位高手，我最近使用Matlab中的fmincon求解时，始终运行出错，望高手给小弟帮忙解答，万分感谢。
例子是网络上的例子，我按照其步骤，系统始终出错。
例子网站：http://wenku.baidu.com/view/1f9a08c30c22590102029d9e.html 在第17页
目标函数： min z=-x1*x2*x3
约束条件：x3*x2+x3*x1+x1*x2-75=0

clear
>> x0=[4;5;6];
>> lb=zeros(3,1);
>> [x,fval,exitflag,output,lambda]=fmincon('-x(1)*x(2)*x(3)',x0,[],[],[],[],lb,[],@Ex1012c)
Warning: Trust-region-reflective algorithm does not solve this
type of problem, using active-set algorithm. You could also try
the interior-point or sqp algorithms: set the Algorithm option
to 'interior-point' or 'sqp' and rerun. For more help, see
Choosing the Algorithm in the documentation.
> In fmincon at 472
??? Error using ==> Ex1012c
Too many output arguments.

Error in ==> fmincon at 670
[ctmp,ceqtmp] = feval(confcn{3},X,varargin{:});

Caused by:
Failure in initial user-supplied nonlinear constraint
function evaluation. FMINCON cannot continue.[ Last edited by 世纪乘风 on 2013-7-3 at 10:14 ]

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