R语言的内置常量有哪些

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想要了解R的内置常量，可以?Constants 命令查询：

?Constants

其常量如下：

1、26个字母LETTERS, 小写字母怎么办？ 有letters

> 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"[25] "Y" "Z"

2、月份，缩写用month.abb，全名用month.name

> 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"    [9] "September" "October"   "November"  "December"

3、圆周率pi

> pi[1] 3.141593

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