Gauss-seidel method in Matlap

By Using finite difference method, i have to determine potential and magnitude of electric field at free nodes in the potential system of figure ( look to the picture ) , for the following conditions ....

a) h= 2 cm, using conventional gauss-seidel method.

b) h= 2 cm, using improved gauss-seidel method.

Notes:

In all conditions, assume that the initial guess for the potential of all free nodes is Vi =1 V.

Convergence tolerance for all conditions is ε = 10-6

Number of iterations should be specify for each part