Eamon asked . 2023-06-12

How we can use fminsearch with a vector as input and return a scaler as an output?

Hello, I have the objective function and I want to minmize this gradiant. e is a vector of ones and y is a vector of size . The . I want find that minmize this objective function. Here is my attempt:

y = rand(1000, 1); % Random target values
e = ones(size(y))
global y

My target function is :

function gradient = gradient(h)
global y
    gradient = 2 * (h*ones(size(y)) - y);
end             

and then calling the function into fminsearch to get the result by :

mu_y = fminsearch( @(h)gradient(h),0);

and I got the error massage :

>> mu_y = fminsearch( @(h)gradient(h),0);
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is
1000-by-1.

Error in fminsearch (line 201)
fv(:,1) = funfcn(x,varargin{:})

Can someone please help in this problem thanks.

Mathematics and Optimization , Optimization Toolbox , Solver Outputs and Iterative Display