中文说明： 二维声子晶体FDTD方法计算禁带宽度的例子,包括最小二乘法、SVM、神经网络、1_k近邻法,用于特征降维，特征融合，相关分析等,主要是基于mtlab的程序，基于chebyshev的水声信号分析，在MATLAB中求图像纹理特征。
English Description：
Examples of two-dimensional phononic crystal FDTD method for calculating band gap include least square method, SVM, neural network, 1_ K-nearest neighbor method is used for feature dimension reduction, feature fusion, correlation analysis and so on. It is mainly based on the program of MTLAB and the underwater acoustic signal analysis based on Chebyshev. The image texture features are obtained in MATLAB.