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 calculate the difference between this 2 string?
Regards,
Dunia
[[alternative HTML version deleted]]
Hi Dunia,
You need to convert the character strings to Dates.
time1 <-
as.Date(c("21/04/2005","23/05/2005","11/04/2005"),
"%d/%m/%Y")
time2 <- as.Date(c("15/07/2009", "03/06/2008",
"15/10/2005"), "%d/%m/%Y")
time2-time1
Best,
Ista
On Thu, Sep 2, 2010 at 10:32 AM, Dunia Scheid <dunia.scheid at gmail.com>
wrote:> 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 calculate the difference ?between this 2 string?
>
> Regards,
> Dunia
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>
--
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org
try to use difftime() instead of as.difftime(). On Thu, Sep 2, 2010 at 10:32 PM, Dunia Scheid <dunia.scheid at gmail.com> wrote:> 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 calculate the difference ?between this 2 string? > > Regards, > Dunia > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >