For the Laplace equation, using this formula can save the inner storage cell of computer by3/4, and, at the same time, quicken the convergence rate without increasing any additional computing works.

• 对于拉普拉斯方程,利用隔点取元公式求解时,可以节约近3/4的计算机内存单元,同时能加快收敛速度,而且没有增添额外的计算工作。