R help - May 2009 - Problem with fractional seconds

Dear List,

I am having problems converting a file with fractional seconds to class POSIXct.
I have set my options to include digits.secs and my format to just time, but my
output is the current date with my time lacking the fractions of a second.  For
example:

options(digits.secs=3)  
t<-c("06:00:00.100","06:00:01.231")
myt<-as.POSIXct(t,format="%H:%M:%S")
myt

[1] "2009-05-26 06:00:00 HST" "2009-05-26 06:00:01 HST"

I would like the output to be just time with fractional seconds. I.e.

06:00:00.100,06:00:01.231

I have also tried Chron times() which did not work either.  Interestingly,
Sys.time() does produce fractional seconds, so I know the options are working.

I would appreciate your help and suggestions.

Aloha,

Tim





Tim Clark
Department of Zoology 
University of Hawaii

Try this:
> as.POSIXct(c("06:00:00.100","06:00:01.231"), format =
"%H:%M:%S%OS")
[1] "2009-05-26 06:00:00.100 EDT" "2009-05-26 06:00:00.231
EDT"


On Tue, May 26, 2009 at 5:52 PM, Tim Clark <mudiver1200 at yahoo.com>
wrote:
>
> Dear List,
>
> I am having problems converting a file with fractional seconds to class
POSIXct. ?I have set my options to include digits.secs and my format to just
time, but my output is the current date with my time lacking the fractions of a
second. ?For example:
>
> options(digits.secs=3)
> t<-c("06:00:00.100","06:00:01.231")
> myt<-as.POSIXct(t,format="%H:%M:%S")
> myt
>
> [1] "2009-05-26 06:00:00 HST" "2009-05-26 06:00:01 HST"
>
> I would like the output to be just time with fractional seconds. I.e.
>
> 06:00:00.100,06:00:01.231
>
> I have also tried Chron times() which did not work either. ?Interestingly,
Sys.time() does produce fractional seconds, so I know the options are working.
>
> I would appreciate your help and suggestions.
>
> Aloha,
>
> Tim
>
>
>
>
>
> Tim Clark
> Department of Zoology
> University of Hawaii
>
> ______________________________________________
> 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.
>

Gabor,

Thanks, that worked.  However, is there is way to just get the time and not have
the date added?  I assume the date is added since POSIX is based on seconds
since 1970.  I can't seem to convert the POSIX value to Chron times(), and
Chron won't take fractional seconds.  Are there other ways to deal with just
time and not date?

Thanks,

Tim

Tim Clark
Department of Zoology 
University of Hawaii


--- On Tue, 5/26/09, Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:
> From: Gabor Grothendieck <ggrothendieck at gmail.com>
> Subject: Re: [R] Problem with fractional seconds
> To: "Tim Clark" <mudiver1200 at yahoo.com>
> Cc: r-help at r-project.org
> Date: Tuesday, May 26, 2009, 11:59 AM
> Try this:
> 
> > as.POSIXct(c("06:00:00.100","06:00:01.231"),
format > "%H:%M:%S%OS")
> [1] "2009-05-26 06:00:00.100 EDT" "2009-05-26 06:00:00.231
> EDT"
> 
> 
> On Tue, May 26, 2009 at 5:52 PM, Tim Clark <mudiver1200 at yahoo.com>
> wrote:
> >
> > Dear List,
> >
> > I am having problems converting a file with fractional
> seconds to class POSIXct. ?I have set my options to include
> digits.secs and my format to just time, but my output is the
> current date with my time lacking the fractions of a second.
> ?For example:
> >
> > options(digits.secs=3)
> > t<-c("06:00:00.100","06:00:01.231")
> > myt<-as.POSIXct(t,format="%H:%M:%S")
> > myt
> >
> > [1] "2009-05-26 06:00:00 HST" "2009-05-26 06:00:01
> HST"
> >
> > I would like the output to be just time with
> fractional seconds. I.e.
> >
> > 06:00:00.100,06:00:01.231
> >
> > I have also tried Chron times() which did not work
> either. ?Interestingly, Sys.time() does produce fractional
> seconds, so I know the options are working.
> >
> > I would appreciate your help and suggestions.
> >
> > Aloha,
> >
> > Tim
> >
> >
> >
> >
> >
> > Tim Clark
> > Department of Zoology
> > University of Hawaii
> >
> > ______________________________________________
> > 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.
> >
>