#title R Tips
[[TableOfContents]]


==== object 존재 여부 체크 ====
{{{
exists(as.character(substitute(fit1)))
}}}

==== apply류 ====
 * http://stackoverflow.com/questions/3505701/r-grouping-functions-sapply-vs-lapply-vs-apply-vs-tapply-vs-by-vs-aggrega
 * http://www.ats.ucla.edu/stat/r/library/advanced_function_r.htm 
 * https://nsaunders.wordpress.com/2010/08/20/a-brief-introduction-to-apply-in-r/

==== 패키지들 ====
 * [http://mockquant.blogspot.jp/2015/07/sparkrext-sparkr-extension-for-closer.html SparkRext]
 * [http://dirk.eddelbuettel.com/code/rcppredis.html RcppRedis]

==== The Overlap Coefficient ====
 * http://www.r-bloggers.com/the-overlap-coefficient/

==== R 레퍼런스 카드 ====
 * http://cafe.naver.com/foralla/2313