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


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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

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