fminunc with a one-variable function

[Jonathan Stickel]

I see the following when I use fminunc to minimize a function of just 
one variable:

  function F = theF(x)
    F = x.^2 + exp(x);
  endfunction
  x0 = 1;
  [xmin,fmin] = fminunc(@theF,x0)

error: Invalid call to cholupdate.  Correct usage is:

  -- Loadable Function: [R1, INFO] = cholupdate (R, U, OP)


I know that there are other minimization functions that can be used for 
single-variable functions, but fminunc should work too.

Thanks,
Jonathan