• R lang
• naming
  • character allowed
• basic syntax
  • command separation
  • comment
  • assignment
• function
  • execute from .R file
  • manipulate data storage
    • show all object
    • remove object
    • store to disk
• data structure
  • vector
• package managing
  • install package

R lang

naming

character allowed

letter, ., _

• cannot start with _
• cannot start with ..

basic syntax

command separation

; or \n

comment

# last to the end of line

assignment

= assignee <- assigner assigner -> assignee

function

execute from .R file

source("filename.R")

manipulate data storage

show all object

objects()

remove object

rm(obj1,obj2,…)

store to disk

choose y when quit q() stored as .RData

data structure

vector

c(ele1,ele2,…) can also take vector as element, will expand

package managing

install package

install.packages("package_name")

• install multiple packages
  use a vector install.packages(c("package1","package2",…))