R 관련

* 기본 공부

http://freesearch.pe.kr/

* Creating publication quality graphics using R

http://www.r-bloggers.com/creating-publication-quality-graphics-using-r/?utm_source=twitterfeed&utm_medium=twitter&utm_campaign=Feed%3A+RBloggers+%28R+bloggers%29

* 추천 R Package

ggplot2,

reshape2,

sqldf,

gridExtra

* R IDE 개발환경

R studio 가 최고인듯 

http://www.rstudio.com/

* R 과 MS-SQL

library(RODBC)

dbhandle <- odbcdriverconnect="" span="">'driver={SQL Server};server=mysqlhost;database=mydbname;trusted_connection=true')

res <- dbhandle="" span="" sqlquery="">'select * from information_schema.tables')

원본 위치 <http://stackoverflow.com/questions/5720508/sql-server-rodbc-connection>

이런식

* R과 그래프

library("ggplot2")

library("ggthemes")

dsamp <- span=""> diamonds[sample(nrow(diamonds), 1000), ]

원본 위치 <https://github.com/jrnold/ggthemes>

* R Histogram 관련

• hist(rnorm(100))

• hist(rnorm(100), breaks=50)

• hist(rnorm(100000),breaks=300)
• 도수간격 300개로

* R 데이터 타입

• 변수
• 스칼라
• 숫자
• NA
• NULL
• 문자열
• 진리값
• Factor  (순서없음, 순서있는경우는 ordered() )
• sex = factor("m", c("m", "f"))
• nlevels(sex)
• levels(sex)
• ordered

• 벡터  (배열의 개념)
• x=c(1, 2, 3, 4, 5)

• 리스트 (해싱, 딕셔너리)
• x = list(name="foo", height=70)

• 행렬 (한가지 유형의 스칼라만 가능, 2차원 행렬)
• matrix(c(1,2,3,4,5,6,7,8,9), nrow=3)

• Array (n차원 행렬)
• matrix(1:12, ncol=4)

• 데이터 프레임
• d=data.frame(x=c(1,2,3,4,5), y=c(2,4,6,8,10))

* R 단축키 모음

 ctrl + L : 화면지우기

* R 단축키 모음

원본 위치 <http://www.blogger.com/blogger.g?blogID=4681934780903114093#editor/target=post;postID=6260174923272834538>