响应面的2阶多项式估计，使用最小二乘法，算法精度高，data数据随便换其他的三维数据-2-order polynomial response surface is estimated using the least squares method, the algorithm accuracy, data data was replaced with other three-dimensional data

在科学与工程计算中，最小二乘法用来拟合数据，精度很高。-Scientific and Engineering Computing, the least squares method is used to fit the data to high precision.

随机子空间的matlab主程序代码，可以实现高精度的辨识。按照《基于随机子空间和最小二乘法的介质损耗角测量方法》、常军博士论文《随机子空间方法在桥梁模态参数辨识中的应用研究》编写。-Stochastic subspace matlab main code, you can achieve high-precision recognition. Accordance with the " stochastic subspace-based least-squares method and