Inputs 
func 
The function defining the set of nonlinear equations to be solved. It should be a function of the form (y)=f(x)
and return an array of the same size as the input which is always a
vector of more than one real numbers.

xin 
the initial guess of the solution . 
showit 
true if the progress of iterations is to be printed out at each iteration. Default value=false .

itmax 
Maximum no. of iterations allowed . Default value=30. 
toler 
Convergence tolerance. Default value=1.e6. 
Outputs 
x 
The computed solution, if the iterations converge. 
it 
The number of iterations required. 
success 
true if the iterations converge, and false otherwise. 