计算电机的机械输出曲线的拟合，方便大家设计电机的输出曲线(Fitting the mechanical output curve of a motor)

最小二乘拟合曲线；系统建模与辨识课程中所用到的两个最基础的程序(Least squares fitting curve,The two most basic programs used in the system modeling and identification course)