Displaying 20 results from an estimated 2000 matches similar to: "difftime on vector"
2010 Sep 02
2
date
Hello all,
I've 2 strings that representing the start and end values of a date and
time.
For example,
time1 <- c("21/04/2005","23/05/2005","11/04/2005")
time2 <- c("15/07/2009", "03/06/2008", "15/10/2005")
as.difftime(time1,time2)
Time differences in secs
[1] NA NA NA
attr(,"tzone")
[1] ""
How can i
2010 Jan 12
0
Wishlist: Function 'difftime' to honor 'tzone' attribute (PR#14182)
Full_Name: Suharto Anggono
Version: 2.8.1
OS: Windows
Submission from: (NULL) (125.165.84.118)
PR#14076 inspired me to write this.
> t1 <- as.POSIXct("1970-01-01 00:00:00", tz="GMT")
> t2 <- as.POSIXlt("1970-01-01 00:00:00", tz="GMT")
> t1 - t2
Time difference of 7 hours
Above, t1 and t2 represent the same time in the same specified
2014 Aug 25
5
problema con campos que tienen formato fecha
Hola Javier,
Muchas gracias por responder tan rápido!
Yo trabajo en Mac OS X 10.9.4.
Versión 0.98.953 de RStudio.
Versión 3.0.2 (2013-09-25) de R.
##
Este es el script que estoy trabajando. Se trata de una rutina para
automatizar el cálculo de la duración del evento.
setwd("/Users/angelacamargosanabria/Documents/ANGELITA/1-DOC/1-TESIS/4-PAPERS/1-Mamiferos/DATOS/Bases")
BASE <-
2008 Apr 09
2
fuzzy merge
Hi,
I would like to merge two data frames. It is just that I want the merging to be done with some kind of a fuzzy criterion. Let me explain.
My first data frame looks like this :
ID1 time1 dt
1 2008-01-02 13:11 10
2 2008-01-02 14:20 20
3
2009 Feb 06
1
Operations on difftime (abs, /, c)
Since both comparison and negation are well-defined for time differences, I
wonder why abs and division are not defined for class difftime. This
behavior is clearly documented on the man page: "limited arithmetic is
available on 'difftime' objects"; but why? Both are natural, semantically
sound, and useful operations and I see no obvious reason that they should
give an error:
2009 Feb 06
1
Operations on difftime (abs, /, c)
Since both comparison and negation are well-defined for time differences, I
wonder why abs and division are not defined for class difftime. This
behavior is clearly documented on the man page: "limited arithmetic is
available on 'difftime' objects"; but why? Both are natural, semantically
sound, and useful operations and I see no obvious reason that they should
give an error:
2006 Apr 03
1
weird "max" behavior for difftime class
If you apply the "max" function to a vector of class "difftime" with
units="days", the returned value is in units of "seconds".
Is this not a bug? At any rate it can lead to confusing results if one
buries a call to "max" deep in some data analysis code.
Details:
> y<-structure(1, class = "difftime", units = "days")
2010 Jun 22
1
New errors with difftime()-objects in 2.11.1 (was Re: Request: difftime method for cut())
On Thu, Jun 10, 2010 at 3:39 PM, Gustaf Rydevik
<gustaf.rydevik at gmail.com> wrote:
> Hi all,
>
> The recent change in 2.11 that made as.numeric() return false on
> difftime-objects broke some of my code that calculated age classes of
> individuals using cut(). While this was no big thing to fix for me, it
> might be wise
> to provide a cut.difftime method to ?stop
2010 Jun 22
1
New errors with difftime()-objects in 2.11.1 (was Re: Request: difftime method for cut())
On Thu, Jun 10, 2010 at 3:39 PM, Gustaf Rydevik
<gustaf.rydevik at gmail.com> wrote:
> Hi all,
>
> The recent change in 2.11 that made as.numeric() return false on
> difftime-objects broke some of my code that calculated age classes of
> individuals using cut(). While this was no big thing to fix for me, it
> might be wise
> to provide a cut.difftime method to ?stop
2018 Aug 01
1
RFC: make as.difftime more consistent or convenient
Hello!
you, Emil Bode <emil.bode at dans.knaw.nl>, wrote on Tuesday, July 31, 2018 1:55 PM:
> Some of the changes you're proposing could be made (with effort), but note that you're not
> restricted to providing strings with a format.
> What you're trying to do can be accomplished with as.difftime(12, units='weeks'), see also
> ?as.difftime
>
> Or if
2013 Jul 09
1
Is difftime a "class"
I am trying to write S4 methods with "difftime" in the signature but
am being "informed" (? not a warning or error) that "difftime" is not
a class. Nevertheless, dispatch takes place. Should I simply ignore
that "information"? Here is a toy example:
> setClass("foo", contains = "Date")
> setMethod("+", c("foo",
2011 Oct 25
2
difftime producing NA values in R 2.12.2
R-listers,
I have noticed several posts on issues with difftime producing NA's
but they have been for older versions of R. Here's the issue
associated with difftime that I am dealing with in R 2.12.2.
> preciptime = strptime("01/10/2007 14:00",format="%m/%d/%Y %H:%M")
> class(preciptime)
[1] "POSIXlt" "POSIXt"
> # Now using difftime, this
2002 Dec 04
2
difftime arithmetic (PR#2345)
Full_Name: Barry Rowlingson
Version: 1.6.0
OS: RH8 i386
Submission from: (NULL) (148.88.136.205)
Strange things happen if I premultiply a difftime() object with a number.
Example:
> d1 <- difftime(Sys.time(),Sys.time())
> d2 <- 1 * difftime(Sys.time(),Sys.time())
> d3 <- difftime(Sys.time(),Sys.time()) * 1
> d1
Time difference of 0 secs
- thats fine
> d2
[1] 0
2010 Apr 05
1
using difftime()
I'm new to R and have the following problem with difftime:
if I directly assign date/time strings in difftime I get the expected
result:
> a<-"2010-03-23 10:52:00"
> a
[1] "2010-03-23 10:52:00"
> b<-"2010-03-23 11:53:00"
> u2<-as.difftime(c(a,b), format ="%Y-%m-%d %H:%M:%S", units="mins")
> u2
Time differences in mins
2009 Sep 25
1
Collision between difftime and ggplot2.
It seems that there are several folks Out There with an itch to
scratch with respect to difftimes.
http://article.gmane.org/gmane.comp.lang.r.devel/19223/match=difftime
http://article.gmane.org/gmane.comp.lang.r.devel/18441/match=difftime
http://article.gmane.org/gmane.comp.lang.r.devel/10882/match=difftime
http://article.gmane.org/gmane.comp.lang.r.devel/11675/match=difftime
and I might be
2007 Mar 22
2
R difftime function: How can we fix the difftime unit?
Hi,
I am trying to take difference of two time objects. I want to fix the
result's unit to minutes. How can I do that?
Here is an example:
> difftime(x, y)
Time difference of 2.030720 hours
> difftime(x, z)
Time difference of 30.34672 mins
where x = '2007-03-05 08:32:58'
y = '2007-03-05 06:31:07'
and z = '2007-03-05 08:02:37'
How can I get answer
2007 Feb 21
1
Adding difftime objects to POSIXt objects
Hello,
?DateTimeClasses states that "one can add or subtract a number of
seconds or a 'difftime' object from a date-time object, but not add two
date-time objects."
So, is the below expected behavior?
> x <- Sys.time()
> x
[1] "2007-02-21 16:19:56 CST"
> x + as.difftime("1","%H")
[1] "2007-02-21 16:19:57 CST"
Warning
2007 Oct 08
2
Incompatible methods ("-.POSIXt", "Ops.difftime") for "-"
Dear all,
according to the Help-page of DateTimeClasses {base} I should be able to do
time - z
with
time date-time objects
z a numeric vector (in seconds) or an object of class "difftime".
However, on R version 2.6.0 (Windows XP) I get
> Sys.time() - as.difftime(c("0:3:20", "11:23:15"))
Time differences in mins
[1] 1191837998 1191837318
2009 Sep 11
1
What determines the unit of POSIXct differences?
Dear All,
what determines if a difference between POSIXct objects gets
expressed in days or seconds?
In the following example, it's sometimes seconds, sometimes days.
as.POSIXct('2009-09-01') - as.POSIXct(NA)
Time difference of NA secs
c(as.POSIXct('2009-09-01'), as.POSIXct(NA)) -
c(as.POSIXct('2009-09-01'), as.POSIXct('2009-08-31'))
Time differences in
2008 May 14
1
Time differences (as.difftime?) issue
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]