Example code for fmincon error.

Hello, everyone. I was tryint to get the idea of using the function fmincon earlier. But when I run the example code in the hlep document, it seems that it doesn't work. the code:

 function f = myfun(x)
 f = -x(1) * x(2) * x(3);
  = [-1 -2 -2; ...
      1  2  2];
b = [0;72];
x0 = [10;10;10];    % Starting guess at the solution
[x,fval] = fmincon(@myfun,x0,A,b);

According to the hlep, a solution to the optimize problem should be given. But when I copied the code into a new script and run it, I got the error:

 >> myfun
Error using myfun (line 2)
Not enough input arguments.

what does this means here, can anybody please explain this to me?

Answer 1

[Shashank Prasanna]

is you objective function, you shouldn't run that. Create the definition of myfun into a separate file called myfun.m:

function f = myfun(x)
 f = -x(1) * x(2) * x(3);
  = [-1 -2 -2; ...
      1  2  2];

And the rest of the code into a different script for example run_fmincon.m:

b = [0;72];
x0 = [10;10;10];    % Starting guess at the solution
[x,fval] = fmincon(@myfun,x0,A,b);

>> run_fmincon

[xinyu]

That's correct. Thank you very much.