一阶声波方程波场模拟，采用的是交错网格，二阶精度，pml边界-A first-order wave equation of wave-field simulation, using the staggered grid, second order accuracy, pml boundary

Matlab写的二维带PML边界激励源是高斯脉冲的FDTD程序-A FDTD program which is written with Matlab and have a PML and Gauss Power