lsqnonlin reports it cannot accept function handle inputs

I have a short script to optimize a four-coefficient nonlinear equation. When I run the script, lsqnonlin reports an error that seems to fly in the face of the direct MATLAB help file about how to run lsqnonlin.

A=5.5;
B=0;
C=1;
p=2;
TM=1;
x0=[A,B,C,p];
%coefficients of the function.
options = optimset('MaxFunEvals',10000,'MaxIter',10000,'TolFun',1e-12,'TolX',1e-12);
x=lsqnonlin(@Error_Curve,x0,[0 0 -1000 0],[1000 1000 1 100],options,I,t);% Calculate the new coefficients using LSQNONLIN.

The vectors I and t are defined previously in the file, but they're long and pointless to include here. Also, my function is defined as follows:

    function F = Error_Curve(x,X,Y)
        A = x(1); B = x(2); C = x(3); p = x(4);
        tt = A./((X./IM).^p-C)+B;
        F = (log10(tt)-log10(Y)).^2;
    end

When the script gets down to run lsqnonlin, I get the following error:

Undefined function 'lsqnonlin' for input arguments of type 'function_handle'.

Error in CurveFitting_Fuses (line 79)
x=lsqnonlin(@Error_Curve,x0,[0 0 -1000 0],[1000 1000 1 100],options,I,t)

I'd expect this if I didn't have the toolbox installed. But I DO have the toolbox installed (version 7.0 with Matlab R2014a).

>> exist('lsqnonlin')
ans =  
     2

I also receive the help information when I ask for it

>> help lsqnonlin
 lsqnonlin solves non-linear least squares problems.
    lsqnonlin attempts to solve problems of the form:
    min  sum {FUN(X).^2}    where X and the values returned by FUN can be   
     X                      vectors or matrices.

This tells me that I have the function. So, I copied the example from the tutorial in the help documentation, but I get the same result.

% SCRIPT optimizer_tutorial.m
x0 = [0.3 0.4]                        % Starting guess
[x,resnorm] = lsqnonlin(@myfun,x0);   % Invoke optimizer

function F = myfun(x)
    k = 1:10;
    F = 2 + 2*k-exp(k*x(1))-exp(k*x(2));
end

>> optimizer_tutorial
x0 =
    0.3000    0.4000
Undefined function 'lsqnonlin' for input arguments of type 'function_handle'.
Error in optimizer_tutorial (line 2)
[x,resnorm] = lsqnonlin(@myfun,x0);   % Invoke optimizer

Why doesn't this function work correctly? Do I have the wrong version of Matlab or something?

Answer 1

[DanD]

In case anyone ends up with a similar problem:

Turns out that while I have the toolbox installed and my local client says I have licensing available, my network admin had me restricted from the license for this particular toolbox. This is purely a licensing problem. Here is one way to check:

>> which -all lsqnonlin
C:\Program Files\MATLAB\R2014a\toolbox\optim\optim\lsqnonlin.m  % Has no license available

[Star Strider]

Thank you!

I’ve never seen that before. I added using which to check for network licensing to my notes on this problem.