给定边界在内部用椭圆型微分方程画网格的程序，包括问题简介和分析和结果，以及源代码，采用了简单迭代，g-s迭代，aid方法等-Given boundary in the internal with elliptic differential painting grid program, including Introduction to the problem and the analysis and results, as well as source code, using a simple iterative GS iteration, aid methods