Error: Function definitions are not permitted in this context

Hi, i tried multiple times to change the function inside a script, but it kept fail eventhough i follow all the instructions and keep correcting. Recently i knew that Matlab 2015b can't include function and script at the same window, so please give me solution. thank you

close all; clear; clc;

%menentukan opsi optimisasi

options = optimoptions('fminsearch','Display','iter','Algorithm','quasi-newton');

%menentukan guess value

xy_guess = [0,0];

%memanggil algoritma optimisasi

[xy_opt, fval] = fminsearch(@fun,xy_guess,options)

%fungsi objektif

function f = fun( in )

x = in(1);

y = in(2);

f = 100*(y-x^2)^2 + (1-x))^2

end

Answer 1

[Fangjun Jiang]

Cut these code from your script. Create a separate .M file called fun.m and past the code.

%fungsi objektif
function f = fun( in )
x = in(1);
y = in(2);
f = 100*(y-x^2)^2 + (1-x))^2
end

[risky amalia]

thank you. i'll try

[risky amalia]

i separated it but still error. what should i do next?

[Fangjun Jiang]

It must not be the same error. What is the error message?