similar to: Strange behaviour of as.POSIXct

A newbie here - please forgive me if this is a basic question. We have an in house package built in R 2.2.1 (yes we're a little behind the times at our firm)and would like to rebuild it using R 2.5.1. However, when I try and build the package from source, I keep getting this error: Error in as(slotVal, slotClass, strict = FALSE) : no method or default for coercing "POSIXt"

I rarely work with dates in R, so I know very little about the POSIXct and POSIXlt classes. I'm importing an excel file into R using the RODBC package, and am having issues reformatting the dates. 1. The important info: > sessionInfo() R version 2.12.2 (2011-02-25) Platform: i386-pc-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United

Running under Windows XP 64 bit, as.POSIXlt()/as.POSIXct() seem to think that US time zones (EST5EDT, MST7MDT) switched from daylight savings back to standard time on Oct 28, 2007, whereas the switch is actually on Sun Nov 04, 2007. Examples: > Sys.timezone() [1] "Mountain Daylight Time" > as.POSIXct("2007-10-30 12:38:47") [1] "2007-10-30 12:38:47 Mountain

Hi everybody When I try example of strptime x <- c("1jan1960", "2jan1960", "31mar1960", "30jul1960") z <- strptime(x, "%d%b%Y") The result is; > z [1] NA NA NA NA I have got the same result with complete form of month but not with numeric form. Any idea? [[alternative HTML version deleted]]

Dear list, When using as.POSIXlt with times measured down to microseconds the default format.POSIXlt seems to cause some possibly undesirable behaviour: According to the code in format.POSIXlt the maximum accuracy of printing fractional seconds is 1 microsecond, but if I do; options( digits.secs = 6 ) as.POSIXlt( 1.000002 , tz="", origin="1970-01-01") as.POSIXlt( 1.999998 ,

Dear All, I encounted in a problem with as.POSIXct() function. > as.POSIXct("2009/03/26 01:00:00 AM" , format="%Y/%m/%d %I:%M:%S %p") [1] NA > as.POSIXct("2009/03/26 02:00:00 PM" , format="%Y/%m/%d %I:%M:%S %p") [1] NA I have tried this in the R version 2.11.1, R version 2.10.1 and R version 2.9.2 . They all does not work. The operation system is

In trying to use as.Date(), I've come across the conversion of POSIXlt to POSIXct when a POSIXlt variable is included in a data frame: my_POSIX <- strptime(c("11-09-2006", "11-10-2006", "11-11-2006", "11-12-2006", "11-13-2006"), "%m-%d-%Y") str(my_POSIX) my_Date <- as.Date(my_POSIX) str(my_Date) data <- format(my_Date)

Hi, when running the following on different instances of R (Linux and Windows), I get different results. The one for Linux seems to be the intended / documented one. When using numeric indices rather than characters, Windows seemed to behave as expected. -----------On Windows-------------- x = matrix(FALSE, nrow=3, ncol=3) colnames(x) = LETTERS[1:3] rownames(x) = letters[1:3] x # A

It is a strange behaviour in that I did not expect it... but I am sure there is a simple explanation for it and it'll have to do with the way numbers are stored in R, but it's caught me by surprise and I don't find it obvious. Here's a simplified example reproducing the behaviour I encountered: I create an empty vector, and I fill it with a sequence of numbers: 0, 0.005,

Hi, I have been using 'read.table' regularly to read tab-delimited text files with data. No problem, until now. Now I have a file that appeared to have read fine, and the data inside looks correct (structure etc), except I only had 15000+ rows out of the expected 24000. Using 'readLines' instead, and breaking up the data by tabs, gives me the expected result. I do not

Dear All, I found the following under R 2.3.0 on WINXP (tested on 2 PCs, I do not have access to Linux from this PC, sorry ... ) > set.seed(10) > x <- ts(rnorm(6),frequency=7) > x Time Series: Start = c(1, 1) End = c(1, 6) Frequency = 7 [1] 0.01874617 -0.18425254 -1.37133055 -0.59916772 0.29454513 0.38979430 > x[24] <- NA > x Time Series: Start = c(1, 1) End = c(1, 6)

Hi, I've read ?is.unsorted and searched. Have found a few items but nothing close, yet. Is the following expected? > is.unsorted(data.frame(1:2)) [1] FALSE > is.unsorted(data.frame(2:1)) [1] FALSE > is.unsorted(data.frame(1:2,3:4)) [1] TRUE > is.unsorted(data.frame(2:1,4:3)) [1] TRUE IIUC, is.unsorted is intended for atomic vectors only (description of x in ?is.unsorted). Indeed

Full_Name: Michael Jacob Version: 1.4.1 OS: Windows 2000 SP2 Submission from: (NULL) (195.27.237.226) Hi, there seems to be a bug in julian(): > Sys.getlocale() [1] "LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=C;LC_NUMERIC=C;LC_TIME=English_United States.1252" > julian(Sys.time()) Error in fromchar(x) : character string is not in a

A user here noticed the following difference between Linux and Windows versions of R-2.15.3 (and R-3.0.0, I think) when using times within a second of the end of 1969: f <- function (sec = -1) { x1 <- as.POSIXct(c(2 * sec, sec, 0), origin = "1970-01-01", tz = "UTC") x2 <- as.POSIXlt(x1) x3 <- as.POSIXct(x2, origin = "1970-01-01", tz =

Full_Name: Mario Luoni Version: 2.10.0 OS: Windows XP HE SP3 Submission from: (NULL) (217.194.59.134) This piece of code: zzz1 <- as.POSIXct("1999-03-18", tz="CET") zzz2 <- as.POSIXlt("1999-03-18", tz="CET") zzz1 == zzz2 as.Date(zzz1) as.Date(zzz2) yields TRUE for "zzz1==zzz2", but the two dates returned by as.Date are different: >

It looks like a timezone issue, and it's causing confusion to me at least. My original data: gmt <- c("19880101 0000", "19880101 0100", "19880101 0300", "19880101 0400", "19880101 0500", "19880101 0600") These were converted to local dates/times with akst<-strptime(gmt,format="%Y%m%d %H%M")-(3600*9) # because I want

I am using 'xyplot' in lattice to plot some data where the x-axis is a POSIXct date. I have data which spans a 6 month period, but when I plot it, only the last month is printed on the right hand side of the axis. I would have expected that at least I would have a beginning and an ending point so that I have a point of reference as to the time that the data spans. Here is some test

Dear all, I have a vector generated using the function strptime: > my.dt [1] "2004-04-19 08:35:00 W. Europe Daylight Time" "2004-04-19 09:35:00 W. Europe Daylight Time" "2004-04-19 11:35:00 W. Europe Daylight Time" [4] "2004-04-19 13:35:00 W. Europe Daylight Time" "2004-04-20 07:50:00 W. Europe Daylight Time" > class(my.dt) [1]

I have suggestions for function 'diff.default' in R. Suggestion 1: If the input is matrix, always return matrix, even if empty. What happens in R 2.15.2: > rbind(1:2) # matrix [,1] [,2] [1,] 1 2 > diff(rbind(1:2)) # not matrix integer(0) > sessionInfo() R version 2.15.2 (2012-10-26) Platform: i386-w64-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=English_United

Norm Josephy <NJOSEPHY@bentley.edu> writes: > Sir: > > I hope you do not mind me sending e-mail directly to you > rather than to the developer's list. I wish to avoid > unnecessary traffic on the list when the issue I raise may > have already been fixed. As a matter of principle: I *do* mind. One of the purposes of having a list is that not everyone has the time