[R] Week value function

[Pele]

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 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
> 
> ______________________________________________
> 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.
> 
> 

-- 
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.