Finite difference for solving poisson PDE on unit squared

Nov 14, 2010 compiled on — Wednesday July 06, 2016 at 08:30 AM

Small example, numerical solution of Poisson PDE on unit square. Dirichlet B.C. $2 − (x− 0.25)2−(y−0.6)2 Δ u = − e$ on unit square.