Hi David - I will try that.. Thanks for your suggestion!
David Winsemius wrote: > > I am not seeing anything but that proves nothing of course. You could > write your own function and stick it in the .First of your .Rprofile > files that get loads at startup. > > Details here: > http://cran.r-project.org/doc/contrib/Lemon-kickstart/kr_first.html > > week.dBY <- function(x) format(strptime(x, "%d%B%Y") , "%W") > > > dt<-"07JAN2009" > > week.dBY(dt) > [1] "01" # a character valued vector > > Gives "00" for "01JAN2009" but you can adjust that behavior to your > specifications. You could also convert to numeric if desired: > > > nweek.dBY <- function(x) as.integer(format(strptime(x, "%d%B%Y") , > "%W")) > > nweek.dBY(dt) > [1] 1 > > -- > David Winsemius > > On Mar 7, 2009, at 12:34 PM, Pele wrote: > >> >> Hi R users, >> >> I am looking for a date function that will give the following: >> - The number-of-week value is in the range 01-53 >> - Weeks begin on a Monday and week 1 of the year is the week that >> includes both January 4th and the first Thursday of the year. >> If the first Monday of January is the 2nd, 3rd, or 4th, the >> preceding days are part >> of the last week of the preceding year. This is similar to >> the >> SAS's week function with option V. >> >> I am currently using : >> >> date <- strptime(DATE, "%d%B%Y") >> week <- format(date, "%W") >> >> but, I could not find an option for doing the above description >> automatically. Can anyone help? >> >> Thanks in advance for any help. >> >> -- >> View this message in context: >> http://www.nabble.com/Week-value-function-tp22389878p22389878.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > David Winsemius, MD > Heritage Laboratories > West Hartford, CT > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > -- View this message in context: http://www.nabble.com/Week-value-function-tp22389878p22394294.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.