https://haoeric.gitbooks.io/r-advanced/content/qu_zi_ji.html http://adv-r.had.co.nz/Subsetting.html 取子集R的取子集操作非常快捷灵活。掌握R中的取子集操作能让你用简洁的方式对数据进行复杂的操作,这是其他编程语言所望成莫及的。R的取子集不是那么容易学习,这之前你需要先了解几个相关的概念:三个取子集操作
https://www.rstudio.com/resources/cheatsheets/ http://michael.peopleofhonoronly.com/vim/vim_cheat_sheet_for_programmers_print.pdf
http://www.tuwenzhai.com/d/a5d63caa-3e81-4237-9905-7ce4173155fb 其他一些书:http://www.tuwenzhai.com/doc/mostread/0
我要学习R么?http://www.ibm.com/developerworks/cn/data/library/bd-learnr/ 在SPSS中调用Rhttps://www.ibm.com/developerworks/cn/analytics/library/ba-call-r-spss/#list1 R essentials for Statisticshttps://github.com
R语言中,简单的S3和S4类的定义# S3 classnewstudent <- function(sid, sname, ssex){ tmp <- list(id = sid, name = sname, sex = ssex) class(tmp) <- "student" return(tmp)}print.student <-
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