Re: [R] No years() function?
Sérgio Nunes snunes at gmail.com writes:
Hi,
I'm trying to aggregate date values using the aggregate function. For example:
aggregate(data,by=list(weekdays(LM),months(LM)),FUN=length)
I would also like to aggregate by year but there seems to be no
years() function.
Should there be one? Is there any alternative choice?
Also, a hours() function would be great. Any tip on this?
Thanks in advance!
Sérgio Nunes
Well, working by analogy with the existing
functions, this might work (not messing with
setting up an S3 default though):
apropos(weekdays)
[1] weekdaysweekdays.Date weekdays.POSIXt
weekdays.Date
function (x, abbreviate = FALSE)
format(x, ifelse(abbreviate, %a, %A))
environment: namespace:base
d1 = Sys.time()
years - function(x,abbreviate=FALSE) {
as.numeric(format(x, ifelse(abbreviate, %y, %Y)))
}
hours - function(x) {
as.numeric(format(x,%H))
}
years(d1); hours(d1)
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Re: [R] No years() function?
From the help of weekdays: Note: Other components such as the day of the month or the year are very easy to compute: just use 'as.POSIXlt' and extract the relevant component. Yet another option: help(package=chron) JR El mié, 07-03-2007 a las 15:35 +, Sérgio Nunes escribió: Hi, I'm trying to aggregate date values using the aggregate function. For example: aggregate(data,by=list(weekdays(LM),months(LM)),FUN=length) I would also like to aggregate by year but there seems to be no years() function. Should there be one? Is there any alternative choice? Also, a hours() function would be great. Any tip on this? Thanks in advance! Sérgio Nunes __ R-help@stat.math.ethz.ch 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. -- Dipl.-Biol. JR Ferrer Paris ~~~ Laboratorio de Biología de Organismos --- Centro de Ecología Instituto Venezolano de Investigaciones Científicas (IVIC) Apdo. 21827, Caracas 1020-A República Bolivariana de Venezuela Tel: (+58-212) 504-1452 Fax: (+58-212) 504-1088 email: [EMAIL PROTECTED] clave-gpg: 2C260A95 __ R-help@stat.math.ethz.ch 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.
