Not enough input arguments driving me crazy - help?

Hi, new to matlab here and having a torrid time of it. Checked the other threads and yet I remain confused. Any help would be greatly appreciated!

Trying to run this code

=================================

function f = objfun(x)

f = -x(1) * x(2) * x(3);

A = [-1 -2 -2; ...

      1  2  2];

b = [0;72];

x0 = [10;10;10];

[x,fval] = fmincon(@objfun,x0,A,b);

====================================

and it returns an error in line 2 not enough input arguments

Can anybody explain what is going on here?

Answer 1

[Youssef Khmou]

hi,

i am not sure what are you trying to do, but try this partial code in the workspace :

 objfun=@(x) x(1)*x(2)*x(3)
 A = [-1 -2 -2;1  2  2];
 b = [0;72];
x0 = [10;10;10];
[x,fval] = fmincon(objfun,x0,A,b)

[Shaun Joseph]

Hi Youssef,

I am trying to work through an example using fmincon

This code you provided works(thanks!)

[Youssef Khmou]

hi,

because there are no inputs in the line :

 [x,fval] = fmincon(@objfun,x0,A,b);

as you described the function to accept an input x, that produced the error .

[Shaun Joseph]

I don't follow...as far as I could tell...the only difference is the extra @ sign, i have the same inputs as your code (x0,A,b)

I'm trying to run code from an m.file having said that, using your code from an m file does not work