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snap shot for prior file

该程序为地震波数值模拟程序，基于声波方程二阶有限差分格式，程序中参数已经进行了说明，对于初学地震波数值模拟的朋友很有帮助。该程序为matlab编制，可以直接进行成图，所得图形为波场快照(The program is a seismic wave numerical simulation program. Based on the second-order finite difference format of the acoustic wave equation, the parameters

数据快照的特征提取，获得基模态、特征值和模态系数，以及数据的后处理。(Feature extraction of data snapshot, obtaining basic modes, eigenvalues and modal coefficients, and post-processing of data.)

快照数据的动态模态分解，获得基模态和对应的特征值，包括频率和增长率，以及数据后处理。(Dynamic modal decomposition of snapshot data to obtain basic modes and corresponding eigenvalues, including frequency and growth rate, and data post-processing.)