On Aug 30, 2011, at 1:36 PM, Christopher W Ryan wrote:
Running R 2.13.1 on Windows XP.
I would like to get week of the year (1-52) for each date.
library(chron)
dts <- dates(c("02/27/92", "02/27/92", "01/14/92","02/28/92",
"02/01/92"))
dts
dts.chron <- as.chron(dts)
dts.chron
class(dts.chron)
# all of these component extractions work:
months(dts.chron)
weekdays(dts.chron)
years(dts.chron)
quarters(dts.chron)
# but weeks() doesn't seem to work
It doesn't "work" for me either but since I also have the package
lubridate loaded, and ?weeks brings up a lubridate help page, I don't
feel I have any right to complain. I get an error message.... what did
you get?:
Error in Ops.dates(pieces$week, 7) : * not defined for chron objects
If I were posting I would also have had the good sense to include the
output of sessionInfo().
weeks(dts.chron)
Try type just:
weeks # I get a lubridate function.
?chron tells me:
Bur what does ?weeks tell you?
. . . The functions days(), months(), quarters(),
years(), weeks(), weekdays(), hours(), minutes(), and seconds() take
any chron object as input and extract the corresponding time interval
. . . .
Any advice?
Thanks.
Chris Ryan
SUNY Upstate Medical University Clinical Campus at Binghamton
Binghamton, NY
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David Winsemius, MD
West Hartford, CT
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
