Newton Raphson circuit problem

Hello everyone,

I have searched a lot to try and solve this problem but I am still yet to solve it. A circuit with R=1000 ohm, and the current in the diode is given by: Id=10^-14 * (exp(40*Vd)-1) A. How can I tell the current in the circuit for a fixed tension in the generator using the Newton Raphson method?

Thank you in advanced, Alves