求槽内电位分布和HALLEN方程的Matlab程序，共三题，源自电磁场数值方法课后例题。- groove potential distribution and HALLEN equation of Matlab, three questions from electromagnetic numerical method, the sample after class.

在matlab软件中，求电磁场中电位的超松弛法。-For the potential of the electromagnetic field over relaxation method.