AR

代码说明：

说明：  AR模型谱估计算法，对初涉AR模型谱估计的同学有很大的帮助，可以了解到其基本的模型构造和其谱估计的迭代步骤。(AR model spectrum estimation algorithm, the AR model spectrum estimation初涉students have a lot of help, it can be seen that the basic model structure and its spectral estimation iterative steps.)