fmincon in for loop

hello, I am trying to use fmincon inside a for loop such as described in the following code:

 for i=1:size(X)
Xd=[X(i);Y(i)];
opts = optimoptions('fmincon','Algorithm','sqp');
f= fmincon(@(x)objfun(x,u,l,c),x0,[],[],[],[]...
      ,[],[],@(x)confcn(x,u,l,c,Xd),opts);
 FF(i)=f;
end

When i fixe Xd, without using for loop, it run greatly. But with for loop, it generate this error:"Subscripted assignment dimension mismatch".

have you some idea to advise me?

[Star Strider]

Yes!

If it runs correctly without the for loop, don’t use the for loop!

Answer 1

[Matt J]

it generate this error:"Subscripted assignment dimension mismatch".

You should be giving us more information than this (a copy/paste of the whole error message). MATLAB error messages will tell you specifically which line of code and which command is generating the error.

However, I assume the problem is in this line

   FF(i)=f;

If f is a vector, you cannot stick it in a scalar location FF(i). Use FF(i,:) or FF(:,i) or whatever is appropriate to the shape of 'f' and the shape of the FF that you have pre-allocated.