Introduction - If you have any usage issues, please Google them yourself
function g=nonlineareq(x)
Here is an example of nonlinear system that can be solved by using
the Matlab command "fsolve" written in the file called "solution.m"
(see quasi-Newton or Levenberg-Marquardt methods).
g(1)=x(1)-4*x(1)*x(1)-x(1)*x(2)
g(2)=2*x(2)-x(2)*x(2)+3*x(1)*x(2)