All right, I get it now: lubridate's week() define weeks from Thursday till the
following Wednesday. You'd probably agree with me that it's a bit strange what
it is going to do over the turn of the year:
> y <-
> as.POSIXct(c("2010-12-27","2010-12-28","2010-12-29","2010-12-30","2010-12-31","2011-01-01","2011-01-02","2011-01-03","2011-01-04","2011-01-05","2011-01-06","2011-01-07","2011-01-08","2011-01-09","2011-01-10","2011-01-11","2010-01-12","2010-01-13","2010-01-14"))
> week(y)
[1] 52 52 52 53 53 1 1 1 1 1 1 2 2 2 2 2 2 2 3
Why would the first week of the year be made of 6 days and the turn from week 1
to week 2 on the night between Thursday and Friday and not Wednesday and Friday
like every other week?
Cheers,
Luca
Il giorno 19/dic/2010, alle ore 18.14, Uwe Ligges ha scritto:
>
>
> On 19.12.2010 13:20, David Winsemius wrote:
>>
>> On Dec 19, 2010, at 5:11 AM, Luca Meyer wrote:
>>
>>> Something goes wrong with the week function of the lubridate package:
>>>
>>>> x= as.POSIXct(factor(c("2010-12-15 17:28:27",
>>> + "2010-12-15 17:32:34",
>>> + "2010-12-15 18:48:39",
>>> + "2010-12-15 19:25:00",
>>> + "2010-12-16 08:00:00",
>>> + "2010-12-16 08:25:49",
>>> + "2010-12-16 09:00:00")))
>>>> require(lubridate)
>>
>>>> weekdays(x)
>>> [1] "Mercoledì" "Mercoledì" "Mercoledì" "Mercoledì" "Giovedì"
>>> "Giovedì" "Giovedì"
>>>> week(x)
>>> [1] 50 50 50 50 51 51 51
>>
>> But 2010-12-15 is a Wednesday and 2010-12-16 is a Thursday.
>>
>
>
> Together with the description of ?week this shows that lubridate's week()
> function works as documented rather than as expected by Luca Meyer.
>
> Uwe Ligges
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