question about date's
On Mon, 12 Dec 2005, ronggui wrote:
x<-as.Date(c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05"))
weekdays(x)
[1] "??????" "??????" "??????" "??????" "??????"
months(x)
[1] "????" "????" "????" "????" "????"
He asked for week numbers. That's nothing like as easy, as it is not well-defined. But
strftime(as.POSIXlt(x), "%U")
[1] "26" "26" "27" "27" "27"
is one possibility ("%W" is another). This approach will do the other
requests just as easily.
======= 2005-12-12 20:17:38 ????????????????=======
Thanks! That solves my problem for year numbers and month numbers Any idea how to do this for week numbers? Regards, Richard On 12/12/05, ronggui <042045003 at fudan.edu.cn> wrote:
This is one way to do it.
x<-c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05")
x
[1] "2005-07-01" "2005-07-02" "2005-07-03" "2005-07-04" "2005-07-05"
substr(x,1,4)
[1] "2005" "2005" "2005" "2005" "2005"
substr(x,6,7)
[1] "07" "07" "07" "07" "07"
substr(x,9,10)
[1] "01" "02" "03" "04" "05"
======= 2005-12-12 20:06:00 ????????????????=======
Hi, Given a frame with calendar date's: "2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05",etc. I want to extract the following from these dates: week number month number year number Any ideas how to accomplish this? Many thanks. Regards, Richard
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= = = = = = = = = = = = = = = = = = = = 2005-12-12 ------ Deparment of Sociology Fudan University My new mail addres is ronggui.huang at gmail.com Blog:http://sociology.yculblog.com
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595