R에 미리 정의되어 있는 상수들 (LETTERS, letters, month.abb, month.name, pi)

R에 미리 정의되어 있는 상수들 (LETTERS, letters, month.abb, month.name, pi)

built-in constant라고 부릅니다. 

LETTERS

letters

month.abb

month.name

pi

> LETTERS

 [1] "A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z"

> letters

 [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"

> month.abb

 [1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"

> month.name

 [1] "January"   "February"  "March"     "April"     "May"       "June"      "July"      "August"    "September"

[10] "October"   "November"  "December" 

> pi

[1] 3.141593