linprog function - error message

Hi,

I am trying to use the linprog function. To start with, I am simply copying the basic example provided in the function description

f = [-5; -4; -6];
A =  [1 -1  1
      3  2  4
      3  2  0];
b = [20; 42; 30];
lb = zeros(3,1);
[x,fval,exitflag,output,lambda] = linprog(f,A,b,[],[],lb);

However, I keep gettting the following error:

??? Undefined function or method 'linprog' for input arguments of type 'double'.

Any idea why I get this error?

Thxs

Answer 1

[Walter Roberson]

You do not have the Optimization toolbox installed, or else you do not have it licensed.

[Jean Marc]

thxs walter.

it is what I read whe I was looking for an answer. However, I can see the linprog.m file in:

C:\Program Files\MatLab\R2010a\toolbox\optim\optim

and I can open it. So I assumed it was installed. Is that wrong?

Thxs again

[Jean Marc]

ah I guess the right to see doesn't give the right to use...

Thxs

[Walter Roberson]

If you use

which -all linprog

it will likely report "no license available"