中文说明：
Particle in cell 方法的matlab代码，非常基础，算例是空间存在一带电平板情况下，等离子体的电场分布和离子密度分布。作为入门非常好。
English Description：
The matlab code of particle in cell method is very basic. The calculation example is the electric field distribution and ion density distribution of plasma when there is a charged plate in space. It's very good to be a beginner