实现对离散数据的最小二乘法拟合，得到多项式表达式-Least squares fit of the discrete data obtained polynomial expression

最小二乘法代码，根据计算方法中的算法进行编写，能够实现任意的最小二乘拟合，适合根据课程学习-Least squares method code, according to the calculation method of the preparation of the algorithm, it is possible to achieve any least-squares fit, according to course for

利用已知点在不同坐标系下的坐标值，根据最小二乘法的原则，求出七参数，实现不同空间直角坐标系的转换。(According to the principle of the least square method, seven parameters are obtained by using the coordinate values of known points in different coordinate systems to realize the transformation of dif