中文说明：用matlab的脚本语言M语言编写的，用于在matlab环境下实现帕笛近似（高阶模型简化降阶）的程序源代码，可以在matlab环境下直接运行。
English Description：
The program source code written by MATLAB script language M language is used to realize PADI approximation (high order model simplification and order reduction) in Matlab environment, which can be directly run in Matlab environment.