MATLAB: Error – not enough input arguments

Question

Hello,

I wrote a function x3.m as follows:

function [ y ] = x3( x )
y=abs(x).^3;
end

Now I want to find the minimum of this function using fminunc.m with the initial value of 2. So I type this in the command window:

a=fminunc(x3,2)

But it returns the following error:

Error using x3 (line 4) Not enough input arguments.

Can anyone please tell me what the problem is with my code? Any help would be greatly appreciated.

Thanks, Khubaib

Answer 1

x3 should be entered as a function handle.

a=fminunc(@x3,2)

Or in this case:

a = fminunc(@(x) abs(x)^3,2);