本程序是用五点差分格式解拉普拉斯方程，采用MATLAB作为开发环境，拉普拉斯方程有广泛的应用，五点差分格式的精度高

-This procedure is a five-point difference scheme for solution of Laplace equation, using MATLAB as a development environment, Laplace equation has a wide range of applications, a five-point difference schemes of high accuracy