dplyr - how to leave only one value (the most recent) from the array of duplicates in R

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65905259/how-to-leave-only-one-value-the-most-recent-from-the-array-of-duplicates-in-r

Answer 1

library(data.table)
setDT(mydat)

mydat[, tail(.SD, 1), PROB_POSTR_KM]
#    PROB_POSTR_KM   a    b
# 1:        378884 7.8 69.5
# 2:        404136 8.0 70.0