datetime - Calculate the number of weekdays between 2 dates in R -


i'm trying write r function calculate number of weekdays between 2 dates. example, nweekdays('01/30/2011','02/04/2011') equal 5.

similar this question. thanks!

/edit: @j. winchester's answer great, wondering if think of way vectorize this, it'll work on 2 columns of dates. thanks! /edit 2: again!

date1 <- as.date("2011-01-30") date2 <- as.date("2011-02-04")     sum(!weekdays(seq(date1, date2, "days")) %in% c("saturday", "sunday"))

edit: , zach said, let there vectorize :)

dates1 <- as.date("2011-01-30") + rep(0, 10) dates2 <- as.date("2011-02-04") + seq(0, 9) nweekdays <- vectorize(function(a, b)    sum(!weekdays(seq(a, b, "days")) %in% c("saturday", "sunday"))) nweekdays(dates1, dates2)

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