You can also find the above content in the following link (I got?permitted by the author of the article in the link, because it is me):

https://zhuanlan.zhihu.com/p/638256833

For more details of?the?algorithm used above, see?this book, Numerical Recipes in C book set Numerical Recipes in C The Art of Scientific Computing, Second Edition (William H. Press, Brian P. Flannery etc.).?

I post it on Bilibili just to take some notes, and I am not willing to answer the question from?strangers. If you are acquainted with me, please discuss with me via e-mail or some other?communication softwares.