function with two variables

Question

ali akbar 2020-5-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/522326-function-with-two-variables

回答： Walter Roberson 2020-5-2

I have a long symbolic function which is evaluated inside matlab and contains two variables theta and xi.

realG1=((1.0*(cos(theta) - sin(theta)*sin(xi)*1.0*i)*(cos(theta)*(0.008866522 - 0.02124593*i) + 0.00765004*cos(xi)*sin(theta) + sin(theta)*sin(xi)*(- 0.02124593 - 0.008866522*i)) - cos(xi)*sin(theta)*(0.06971876*cos(theta) + cos(xi)*sin(theta)*(0.008866522 + 0.02124593*i) - sin(theta)*sin(xi)*0.06971876*i) + 0.03551045 + 0.008096911*i)^2 )

My code is following

g= matlabfunction(realG1)
 rng default
gs=GlobalSearch;
opts = optimoptions(@fmincon,'Algorithm','interior-point');
problem = createOptimProblem('fmincon','x0',[0,0],'objective',g,'lb',[0,0],'ub',[],'options',opts);
[theta,xi,output] = run(gs,problem)

when I run it for only theta(removing xi on the last line), it minimizes just fine. But with two variables, it says not ''Not enough input arguments''. Can anyone help.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ameer Hamza 2020-5-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/522326-function-with-two-variables#answer_429697

在 MATLAB Online 中打开

Change the code like this

g = matlabfunction(realG1)
obj_fun = @(x) g(x(1),x(2)); %<<=== add this line
rng default
gs=GlobalSearch;
opts = optimoptions(@fmincon,'Algorithm','interior-point');
problem = createOptimProblem('fmincon','x0',[0,0],'objective',obj_fun,'lb',[0,0],'ub',[],'options',opts);
[theta,xi,output] = run(gs,problem)                          % ^ change to obj_fun