[R] Week value function
drdionc at yahoo.com
Sun Mar 8 03:30:49 CET 2009
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:
> week.dBY <- function(x) format(strptime(x, "%d%B%Y") , "%W")
> > dt<-"07JAN2009"
> > week.dBY(dt)
>  "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") ,
> > nweek.dBY(dt)
>  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
>> 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:
>> Sent from the R help mailing list archive at Nabble.com.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> and provide commented, minimal, self-contained, reproducible code.
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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