1）先利用文件Lorenz.m求解出Lorenz系统，并把其数组保存成名字为un.mat的文件。

2）直接运行文件Lorenz1.m 便可统计出Lorenz系统的轨道-a) first use of document Lorenz.m solved Lorenz system, and the preservation of its array of un.mat name into the paper. 2) Run the file directly Lorenz1.m Lorenz will be the statistics on the track