Finite Difference Band Matrix Method for Laplace Equation

Using band matrix method, Laplace equation is solved for a parallel plate capacitor.

In this code , Laplacian matrix is formed and used to calculate electric potential of a parallel plate capacitor with initial condition +15 and -15 units on either capacitor plates.
Reference: Principles of Electromagnetics, 4th Edition, M.N.O. Sadiku, Oxford.