高阶精度有限差分法数值求解一维Euler方程，-FDM solutions of 1D Euler Equation

该程序实现了声波方程空间高阶有限差分模拟，运用无分裂的PML边界降低了分裂边界的复杂程度(The program realizes the high order finite difference simulation of the acoustic equation space, the degree of complexity of the splitting boundary is reduced by using the non splitting PML boundary.)

频域有限差分法（FDFD）做出色散特性曲线图(Frequency domain finite difference method (FDFD) to make the dispersion characteristic curve)