Introduction - If you have any usage issues, please Google them yourself
(1) " luyan_4-RK-method" folder for the fourth-order RK method for the numerical solution matlab code and the results of the picture. (2) " luyan_Nystrom-Methods" folder Nystrom method for the numerical solution matlab code and the results of the picture. (After the files are extracted, for running, you may need to file names into English, and does not have a Chinese path)