On 21/05/2014 08:33, Jeff Newmiller wrote:
You did not show us how "x" was created, so we cannot tell whether this indicates a bug or not. My bet would be that "x' was created in some way that bypassed the standard POSIXct creation code.Note that your timezone specification is not atypical for output shorthand but may not yield consistent results for input on different OS or locale combinations. I think "Etc/GMT-1" or "Europe/Amsterdam" will be more reliable depending on your typical data sources.
Etc/GMT-1 is not standard (although widely implemented) and does not have DST so seems inappropriate here. But note that we only have the time-zone abbreviations here, not the 'timezone specification'. (See ?Sys.timezone.)
"CET" is pretty much portable as a time zone and well-defined post 1945. But that does not mean that many places in the current CET time zone have used CET ever since 1945: the DST transition rules were changing up to the 1980s, and Portugal has been in and out of CET (twice) since.
All systems I know will use CET and CEST consistently as abbreviations for UTC+01:00 and UTC+02:00 (with the sign commonly used for that notation, the opposite of GMT-1).
--------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. On May 20, 2014 11:11:12 PM PDT, Jens Scheidtmann <jens.scheidtm...@gmail.com> wrote:Dear all, I have had a "weird" problem in R 3.0.2:x[1] "2006-03-14 12:48:01 CET" "2006-05-02 11:09:48 CEST"str(x)POSIXct[1:2], format: "2006-03-14 12:48:01" "2006-05-02 11:09:48"x + 6Error in unclass(e1) + unclass(e2) : non-numeric argument to binary operatoras.POSIXct(x) + 6Error in unclass(e1) + unclass(e2) : non-numeric argument to binary operator I was puzzled to the max and did not understand what's wrong:y <- c(as.POSIXct("2006-03-14 12:48:01 CET"), as.POSIXct("2006-05-0211:09:48 CEST"))y[1] "2006-03-14 12:48:01 CET" "2006-05-02 11:09:48 CEST"str(y)POSIXct[1:2], format: "2006-03-14 12:48:01" "2006-05-02 11:09:48"y + 6[1] "2006-03-14 12:48:07 CET" "2006-05-02 11:09:54 CEST" My immediate assumption was, that something was wrong with the internal representation. After some googling I discovered dput and there it was:dput(x)structure(c("1142336881", "1146560988"), class = c("POSIXct", "POSIXt"))dput(y)structure(c(1142336881, 1146560988), class = c("POSIXct", "POSIXt")) So on the inside "x" is a character vector, while "y" is a numeric vector. Ok, seems I need to force conversion to the "sensible" representation:xx <- as.POSIXct(as.character(x)) dput(xx)structure(c(1142336881, 1146560988), class = c("POSIXct", "POSIXt"), tzone = "") Now my questions: Shouldn't as.POSIXct() force the recommended or canonical internal representation? Would you regard this as a bug? Or is the code, which created x in the first place to blame? Thanks in advance, Jens [[alternative HTML version deleted]] ______________________________________________ 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.______________________________________________ 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.
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