理想气体状态方程的一维波前追踪程序，能够精确捕捉界面，求解黎曼问题-ideal gas equation of state one-dimensional front tracking algorithm

精确黎曼解，中科院李新亮老师授课用，可求解该问题-Exact Riemann solution, Chinese Academy of Sciences Li XL teachers to teach with, the problem can be solved

Matlab求解一维黎曼问题。 keshe.m是主程序 time.m是一级程序 YRD.m是格式程序 theta.m是限制器 drawing.m是绘图程序 qx.txt是精确解数据（缺少会报错）-Matlab solving a dimensional Riemannian problem. keshe.m is the main program is a program YRD.m time.m is the format of the program theta.m

sod激波管问题，x<0:(u,ρ,p)=(0,1,1);x≥0:(u,ρ,p)=(0,0.125,0.1),画出t=0.14时刻的u,ρ,p曲线.(The Sod shock tube problem, named after Gary A. Sod, is a common test for the accuracy of computational fluid codes, like Riemann solvers, and was heavily investigated by S