应用小区域方差对比，程序简单，包含特征值与特征向量的提取、训练样本以及最后的识别，二维声子晶体FDTD方法计算禁带宽度的例子。- Application of small area variance comparison, simple procedures, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Dimensional phononi