A.9 Very Basic Functions

다음은 R을 배울때 가장 먼저 배우는 함수들이다.

?                # help
c                # concatenate or combine vectors or lists
str              # show the structure
install.packages # install packages from a repository
library          # load package
require          # load package with returning TRUE or FALSE
rep              # repeat
seq              # sequence
setwd            # set working directory
getwd            # get working directory
print            # has some useful options
expression       # expression constructor
attach           # not recommended to use this function
detach           # make the names no longer available or unload packages