I made some mistakes in my previous email setting of Github, so it makes all my contributions for last three months invisible to others... The tutorial is as below: https://help.github.com/articles/changing-author-info/

% New add on Mar 6th.

To explain someone's confusion of what's going on in this small project. You can see introduction in HW1.pdf and answer on HW1_Sidi.Chang.pdf.

Copyright by Prof Anke Van Zuylen, please contact her if you want to send HW1 to others. Please let me know if you have any extra problems.