Undefined function or method 'fsolve' for input arguments of type 'function_handle'

I'm using a script that needs to solve a nonlinear function, and when executing the function, I get an error stating it is Undefined.

I have looked into an example use of this function in the Matlab documentation here:

http://www.mathworks.com/help/optim/ug/fsolve.html?searchHighlight=fsolve

I follow the specific steps shown in the example. I create a file called root2d.m, that contains this:

   % Copyright 2015 The MathWorks, Inc.

   function F = root2d(x)

   F(1) = exp(-exp(-x(1)+x(2))) - x(2)*(1+x(1)^2);
   F(2) = x(1)*cos(x(2)) + x(2)*sin(x(1)) - 0.5;

then execute the following in the command window:

>> fun = @root2d; >> x0 = [0,0]; >> x = fsolve(fun,x0)

and get the following result:

??? Undefined function or method 'fsolve' for input arguments of type 'function_handle'.

I see fsolve was included as a native function prior to R2006. Any idea what is wrong? Thanks in advance!

Walt

Answer 1

[Steven Lord]

FSOLVE is part of Optimization Toolbox. Based on that error I suspect you do not have this product installed; you can check this by looking at the output of the VER function.

[Walt White]

Thank you, that explains it. We don't have that toolbox.