The month.abb is a built-in R constant, a three-letter abbreviation for the English month names.
month.abb
Output
[1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
If you have a vector of integers consisting of the number of the month, then you can use it to get the three-letter abbreviation of the month name by doing the following.
mnth <- c(12, 10, 8, 6, 4, 2)
month.abb[mnth]
Output
[1] "Dec" "Oct" "Aug" "Jun" "Apr" "Feb"
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