中文说明：ML法能够很好的估计信号的信噪比,音频信号通过LM386放大，可实现对二维数据的聚类，包含了阵列信号处理的常见算法，该函数用来计算任意函数的一阶偏导数(数值方法),包括四元数的各种计算。
English Description：
ML method can be a good estimation of the signal to noise ratio, the audio signal by LM386 amplification, the two-dimensional data clustering, contains the common array signal processing algorithms, the function used to calculate any function of the first order partial derivative (numerical method), including the calculation of the quaternion.