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 at 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