matlab中fmincon函数的使用

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fmincon是用于求解非线性多元函数最小值的matlab函数。其语法格式比较多，参数也是各有各的意思，我就举几个例子，大家可从代码中去体会其使用方法。

示例一

%% 只是大概写个板式，这里的fun2和fun3要自己去定义，这里就不写出来了，前面%有介绍过clcclearA=[3 2 1;1 2 3; 2 0 0;0 3 0;0 0 2]b=[120;80;96;102;40]lb=zeros(3,1)x0=[1;1;1][X fval]=fmincon(@fun3,x0,A,b,[],[],lb,[])x0=[1;1]; A=[2 3 ;1 4]; b=[6;5]; Aeq=[];beq=[]; VLB=[0;0]; VUB=[]; [x,fval]=fmincon('fun2',x0,A,b,Aeq,beq,VLB,VUB)

示例二

%%开始采用默认设置options = optimoptions('fmincon');%% 修改参数设置options = optimoptions(options,'Display', 'off');options = optimoptions(options,'Algorithm', 'sqp');options = optimoptions(options,'GradObj', 'on');options = optimoptions(options,'GradConstr', 'on');[x,fval,exitflag,output,lambda,grad,hessian] =fmincon(@fit1,x0,A,b,Aeq,beq,lb,ub,nonlcon,options);

示例三

%% Start with the default optionsoptions = optimoptions('fmincon');%% Modify options settingoptions = optimoptions(options,'Display', 'off');options = optimoptions(options,'Algorithm', 'sqp');[x,fval,exitflag,output,lambda,grad,hessian] = ...fmincon(@fun3,x0,Aineq,bineq,[],[],lb,[],[],options);

示例四

%% Start with the default optionsoptions = optimoptions('fmincon');%% Modify options settingoptions = optimoptions(options,'Display', 'off');options = optimoptions(options,'Algorithm', 'sqp');options = optimoptions(options,'GradConstr', 'on');[x,fval,exitflag,output,lambda,grad,hessian] = ...fmincon(@fun3,x0,Aineq,bineq,[],[],lb,[],[],options);

示例五

%%开始采用默认设置options = optimoptions('fmincon');%% 修改参数设置options = optimoptions(options,'Display', 'off');options = optimoptions(options,'Algorithm', 'sqp');options = optimoptions(options,'GradObj', 'on');options = optimoptions(options,'GradConstr', 'on');[x,fval,exitflag,output,lambda,grad,hessian] = ...fmincon(@fun3,x0,Aineq,bineq,[],[],lb,[],[],options);

示例六

function [x,fval,exitflag,output,lambda,grad,hessian] = fmincon代码(x0,Aineq,bineq)%% This is an auto generated MATLAB file from Optimization Tool.%% Start with the default optionsoptions = optimoptions('fmincon');%% Modify options settingoptions = optimoptions(options,'Display', 'off');options = optimoptions(options,'Algorithm', 'sqp');[x,fval,exitflag,output,lambda,grad,hessian] = ...fmincon(@fun3,x0,Aineq,bineq,[],[],[],[],[],options);

不要迷信别人写的，最重要的是自己思考。

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