R语言相关的cheat sheet
https://www.rstudio.com/resources/cheatsheets/
http://michael.peopleofhonoronly.com/vim/vim_cheat_sheet_for_programmers_print.pdf
https://www.rstudio.com/resources/cheatsheets/
http://michael.peopleofhonoronly.com/vim/vim_cheat_sheet_for_programmers_print.pdf