Error fsolve

I write a file that computes F, the values of the equations at x.

function F = myfun(x)
F = [2*x(1) - x(2) - exp(-x(1));
      -x(1) + 2*x(2) - exp(-x(2))];

Save this function file as myfun.m somewhere on your MATLAB path. Next, set up the initial point and options and call fsolve:

x0 = [-5; -5];          
options=optimset('Display','iter');   
[x,fval] = fsolve(@myfun,x0,options)

Then I get a mistake

??? Attempt to execute SCRIPT fsolve as a function:
\fsolve.m

Error in ==> fsolve at 3
[x,fval] = fsolve(@myfun,x0,options)

What is wrong?

Thanks in advance.

Answer 1

[Sean de Wolski]

which fsolve -all

will show which fsolve you're calling and the real one. More than likely you wrote a script called 'fsolve' and saved it on your path. Rename this script and life should be good.

[Elena]

I renamed it.. it doesn't work

I still get a mistake

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

[Sean de Wolski]

If you type:

ver

at the command line, does the Optimization Toolbox show up?

[Walter Roberson]

GADS, not Optimization

http://www.mathworks.com/matlabcentral/answers/22578-undefined-function-or-method-fsolve-for-input-arguments-of-type-function_handle