Dennis M. Sullivan书中程序3.3.c，可以直接运行，计算步数、计算空间、圆柱体大小，位置，相对介电常数需要直接在程序里修改-Dennis M. Sullivan book procedures 3.3.c, can be directly run, the calculation step, calculation of space, cylinder size, location, relative dielectric constant directly in the program need to modify