迭代函数系统的实现小程序，内涵C++源代码，及运行程序-Iterated Function System of small programs, and the substance of C source code, and operational procedures

二阶系统的最小二乘一次完成算法辨识程序,图形的横坐标是采样时刻(Second order system is a complete algorithm of least squares identification procedures, graphic abscissa is sampling time)