On Thu, Jan 6, 2011 at 5:27 AM, Joshua Wiley <jwiley.ps...@gmail.com> wrote:
> timeSequence() ultimately is relying on seq.POSIXt(). If you look at
My apologies, I spoke nonsense---timeSequence() does NOT rely on
seq.POSIXt(). The timeDate package has its own method defined for
seq() which is what gets dispatched. Still, the behavior is similar:
> timeSequence(from = "2010-01-15", to = "2010-02-01", by = "1 month")
GMT
[1] [2010-01-15] [2010-02-15]
>
> seq.POSIXt(from = as.POSIXct("2010-01-15"),
+ to = as.POSIXct("2010-02-01"), by = "1 month")
[1] "2010-01-15 PST" "2010-02-15 PST"
which is not surprising because the code is responsible for this
behavior is similar:
###### seq.timeDate* ######
else if (valid == 6) {
if (missing(to)) {
mon <- seq.int(r1$mon, by = by, length.out = length.out)
}
else {
to <- as.POSIXlt(to)
mon <- seq.int(r1$mon, 12 * (to$year - r1$year) +
to$mon, by)
}
r1$mon <- mon
r1$isdst <- -1
res <- as.POSIXct(r1)
}
###### seq.POSIXt ######
else if (valid == 6L) {
if (missing(to)) {
mon <- seq.int(r1$mon, by = by, length.out = length.out)
}
else {
to <- as.POSIXlt(to)
mon <- seq.int(r1$mon, 12 * (to$year - r1$year) +
to$mon, by)
}
r1$mon <- mon
r1$isdst <- -1
res <- as.POSIXct(r1)
}
and "res" is the object returned in both cases (I believe).
My system:
R version 2.12.1 (2010-12-16)
Platform: i486-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] timeDate_2130.91
______________________________________________
R-help@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.
