编制阶跃响应与方波响应相互转化的程序、由阶跃响应数据获得对象传递函数模型的通用程序、由阶跃响应数据获得对象微分方程模型的通用程序-Preparation step response transformed into each other with a square wave response procedures, and general program of the transfer function model from step response data, and general pro