On Thu, May 21, 2009 at 8:28 PM, Gabor Grothendieck ggrothendi...@gmail.com
wrote:
It uses hours/minutes/seconds for values 1 day and uses days and
fractions
of a day otherwise.
Yes, my examples were documenting this idiosyncracy.
For values and operations that it has not considered it
You could create a subclass of times with its own print and format
methods that printed and formatted hours/minutes/seconds even if
greater than one day if that is the main item you need.
Regarding division you could contribute that to the chron package.
I've contributed a few missing items and
On Fri, May 22, 2009 at 10:03 AM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
Regarding division you could contribute that to the chron package.
I've contributed a few missing items and they were incorporated.
Good to know. Maybe I'll do that
Giving an error when it does not
On Fri, May 22, 2009 at 11:01 AM, Stavros Macrakis
macra...@alum.mit.edu wrote:
On Fri, May 22, 2009 at 10:03 AM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
Regarding division you could contribute that to the chron package.
I've contributed a few missing items and they were
On Fri, May 22, 2009 at 12:28 PM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
...The way this might appear in code is if someone wanted to calculate the
number of one hour intervals in 18 hours. One could write:
t18 - times(18:00:00)
t1 - times(1:00:00)
as.numeric(t18) /
On Fri, May 22, 2009 at 1:55 PM, Stavros Macrakis macra...@alum.mit.edu wrote:
On Fri, May 22, 2009 at 12:28 PM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
...The way this might appear in code is if someone wanted to calculate the
number of one hour intervals in 18 hours. One could
On Wed, May 20, 2009 at 12:28 PM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
There is a times class in the chron package.
Perfect! Just what I was looking for.
On Wed, May 20, 2009 at 12:19 PM, jim holtman jholt...@gmail.com wrote:
If you want the hours from a POSIXct, here is one
On Thu, May 21, 2009 at 5:04 PM, Stavros Macrakis macra...@alum.mit.edu wrote:
On Wed, May 20, 2009 at 12:28 PM, Gabor Grothendieck
ggrothendi...@gmail.com wrote:
There is a times class in the chron package.
Perfect! Just what I was looking for.
On Wed, May 20, 2009 at 12:19 PM, jim
What is the recommended class for time of day (independent of calendar
date)?
And what is the recommended way to get the time of day from a POSIXct
object? (Not a string representation, but a computable representation.)
I have looked in the man page for DateTimeClasses, in the Time Series
There is a times class in the chron package. Times are measured
in fractions of a day so 1/24 is one hour.
library(chron)
dt - Sys.time()
tt - times(format(dt, %H:%M:%S))
tt
[1] 12:27:46
tt + 1/24
[1] 13:27:46
There is an article on dates and times in R News 4/1.
On Wed, May 20, 2009 at
If you want the hours from a POSIXct, here is one way of doing it; you can
create a function for doing it:
x - Sys.time()
x
[1] 2009-05-20 12:17:13 EDT
y - difftime(x, trunc(x, units='days'), units='hours')
y
Time difference of 12.28697 hours
as.numeric(y)
[1] 12.28697
It depends on what
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