中文说明：详细画出了时域和频域的相关图，插值与拟合的matlab实现，一个计算声子晶体结构的一维传递矩阵法,一种噪声辅助数据分析方法,利用最小二乘法进行拟合多元非线性方程，该函数用来计算任意函数的一阶偏导数(数值方法)。
English Description：
Detailed drawing of the time domain and frequency domain correlation diagram, interpolation and fitting matlab implementation, a computing one-dimensional phononic crystal structure of transfer matrix method, a noise assisted data analysis method, using the method of least squares fitting multivariate nonlinear equations, the function for computing any function of first-order partial derivative (numerical method).