Write a MATLAB program to solve the following BVP
Solve the following boundary value problem using finite difference method,
with ∆x = ∆y =
1
3
∂
2u
∂x2
+
∂
2u
∂y2
= 0, 0 < x < 1, 0 < y < 1
u(x, 0) = u(0, y) = 0, u(x, 1) = x, u(1, y) = y, 0 ≤ x ≤ 1, 0 ≤ y ≤ 1