how to resolve a "input argument is undefined error"?

Hi, i'm going crazy with this...I post here the function and the line that gives me this error:

function f = objfun(x)

f = 13.9 + (25.055 * x(1)^-0.3017) + (11.266 * x(1)^0.4925 * x(2)^-1) + (0.45 * x(1)^0.7952 * x(2)^-1) + (0.067 * x(2)^-1* (2*x(1) + 1.2*x(2))^0.861)+ (0.045 * x(2)^-1*(2*x(1) + 1.2*x(2)))+(14.005*x(2)^-0.1899)+(2.914e-4*x(2)^0.671);

options = optimoptions(@fminunc,'Algorithm','quasi-newton');

x0 = [1e4,6e4]; % Starting guess

x = fminunc(@(x)objfun,x0,options)

??? Input argument "x" is undefined.

Error in ==> objfun at 6

I write any code of function with different f, I get an error message please help me, I need it so much... Thanks alot

Answer 1

[Orion]

Hi,

just replace

x = fminunc(@(x)objfun,x0,options)

with

x = fminunc(@objfun,x0,options)

[nasrin]

Thank you very much for your kind attention.

I did it but still give that error.

[Orion]

silly question :

do you have well separated your code ?

meaning, the function to solve in a mfile objfun.m

function f = objfun(x)

f = 13.9 + (25.055 * x(1)^-0.3017) + (11.266 * x(1)^0.4925 * x(2)^-1) + ...
    (0.45 * x(1)^0.7952 * x(2)^-1) + (0.067 * x(2)^-1* (2*x(1) + 1.2*x(2))^0.861)+...
    (0.045 * x(2)^-1*(2*x(1) + 1.2*x(2)))+(14.005*x(2)^-0.1899)+(2.914e-4*x(2)^0.671);

and, in a script, or in the command window, the calling lines :

clear all
options = optimoptions(@fminunc,'Algorithm','quasi-newton');

x0 = [1e4,6e4]; % Starting guess

x = fminunc(@objfun,x0,options)