Optimization of a unknown vector variable

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Soumili Sen 2020-11-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/665338-optimization-of-a-unknown-vector-variable

评论： Soumili Sen 2020-11-29

采纳的回答： Matt J

在 MATLAB Online 中打开

Hello ,

I have a code

a,b -----> variables should be vector(like a=[a1,a2,a3,a4])

x=h1*a^2+h2*b^2+h3;------>objctive fun(h1,h2,h3 are constants let say which has 1*4 value)

---->constraints are also present here.. so I am writting the code like

for i=1:4
x(i)=h1(i)*a^2+h2(i)*b^2+h3(i)
end
obj=sum(x);----->(objective function is basically summation of x )
x0=[1,1];
lb = [];
ub = [];
Aeq = [];
beq =[];
A = [];
b = [];
 fun=@(p) obj(p(1),p(2));
nonlcon =@constraintfcn;
opts = optimoptions('fmincon','Display','iter','Algorithm','sqp');
 [x_value,fval]  = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,nonlcon,opts);

But I am not getting the ans,I want optimized value as vector .

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Matt J 2020-11-27

Quite unclear, I'm afraid. What is the for-loop supposed to be doing? Do you have more than one objective to minimize? Why does the right hand side not depend on i?

Soumili Sen 2020-11-28

编辑：Soumili Sen 2020-11-28

yes, you are right. My objective function is summation of 'x' (I have modified my code), and the unknown optimized veriables are vector. so how can I continue to find the values?

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采纳的回答

Matt J 2020-11-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/665338-optimization-of-a-unknown-vector-variable#answer_558418

编辑：Matt J 2020-11-28

在 MATLAB Online 中打开

H1=sum(h1);
H2=sum(h2);
H3=sum(h3);
obj=@(a,b) H1.*a.^2 +H2.*b.^2+H3;
x0=[1,1];
lb = [];
ub = [];
Aeq = [];
beq =[];
A = [];
b = [];
 fun=@(p) obj(p(1),p(2));
nonlcon =@constraintfcn;
opts = optimoptions('fmincon','Display','iter','Algorithm','sqp');
 [x_value,fval]  = fmincon( fun,x0,A,b,Aeq,beq,lb,ub,nonlcon,opts);