How can I pass a function into a function and find the minimum?

Question

Dimitra Kyriakouli 2019-12-2

关闭： MATLAB Answer Bot 2021-8-20

Hi! I have a problem when trying to minimize a function with fminsearch. I have this function:

function [f] = myfunc(X)
x1 = X(1);
x2 = X(2);
f = 2*x1^2 + 2*x1*x2 + 2*x2^2 - 6*x1;
end

and I want to minimize the f(X+a*grad) where X and grad are known.

I tried this:

[f] = myfunc(@(a) X + a * grad);
a = fminsearch(f,0)

but it doesn't seem to work.

Do you have any suggestions on how to make my code work?

Star Strider 2019-12-2

Please describe what you want to do.

the ‘f’ assignment and your fminsearch call make no sense.

Answer 1

solution:

f=@(a) myfunc(X + a * grad);
a = fminsearch(f,0)