Hello!
If I would like to generate a sequence of seconds for a date, I would do
the following:
x - seq(from=as.POSIXct(2014-08-12 00:00:00),to=as.POSIXct(2014-08-12
23:59:59),by=secs)
What if I just want the seconds vector without the date, please? Is there
a convenient way to create such a
On Aug 12, 2014, at 1:51 PM, Erin Hodgess erinm.hodg...@gmail.com wrote:
Hello!
If I would like to generate a sequence of seconds for a date, I would do
the following:
x - seq(from=as.POSIXct(2014-08-12 00:00:00),to=as.POSIXct(2014-08-12
23:59:59),by=secs)
What if I just want the
What if I just want the seconds vector without the date, please? Is there
a convenient way to create such a vector, please?
Why do you want such a thing? E.g., do you want it to print the time
of day without the date? Or are you trying to avoid numeric problems
when you do regressions with
What I would like to do is to look at several days and determine activities
that happened at times on those days. I don't really care which days, I
just care about what time.
Thank you!
On Tue, Aug 12, 2014 at 3:14 PM, William Dunlap wdun...@tibco.com wrote:
What if I just want the
If your activities of interest are mainly during the workday then
seconds-since-3am might give good results, avoiding most daylight
savings time issues. If they are more biologically oriented then
something like seconds before or after sunrise or sunset might be
better. Both can be expressed as
On Tue, Aug 12, 2014 at 1:51 PM, Erin Hodgess erinm.hodg...@gmail.com wrote:
Hello!
If I would like to generate a sequence of seconds for a date, I would do
the following:
x - seq(from=as.POSIXct(2014-08-12 00:00:00),to=as.POSIXct(2014-08-12
23:59:59),by=secs)
What if I just want the
Erin,
Is a sequential resolution of seconds required, as per your original post?
If so, then using my approach and specifying the start and end dates and times
will work, with the coercion of the resultant vector to numeric as I included.
The method I used (subtracting the first value) will
On Tue, Aug 12, 2014 at 2:40 PM, John McKown
john.archie.mck...@gmail.com wrote:
snip
You can simply make that a function
getTimePortion - function(POSIXct_value) {
value_in_seconds=as.integer(POSIXct_value);
sprintf(%02d:%02d:%02d, #
And some people wonder why I absolutely abhor daylight saving time.
I'm not really fond of leap years and leap seconds either. Somebody
needs to fix the Earth's rotation and orbit!
On Tue, Aug 12, 2014 at 2:14 PM, William Dunlap wdun...@tibco.com wrote:
What if I just want the seconds vector
On Aug 12, 2014, at 2:49 PM, John McKown john.archie.mck...@gmail.com wrote:
And some people wonder why I absolutely abhor daylight saving time.
I'm not really fond of leap years and leap seconds either. Somebody
needs to fix the Earth's rotation and orbit!
I have been a longtime proponent
On Tue, Aug 12, 2014 at 2:26 PM, Erin Hodgess erinm.hodg...@gmail.com
wrote:
What I would like to do is to look at several days and determine
activities
that happened at times on those days. I don't really care which days, I
just care about what time.
Thank you!
Ah! A light dawns. You want
Marc:
You just need to be more patient -- this is already happening:
http://en.wikipedia.org/wiki/Tidal_acceleration
Cheers,
Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom.
Again, in my opinion, all time date should be recorded in GMT.
It depends on context. If you are studying traffic flow or
electricity usage, then you want local time with all its warts
(perhaps stated as time since 3am so any daylight savings time
problems are confined to a small portion of
On Tue, Aug 12, 2014 at 3:23 PM, William Dunlap wdun...@tibco.com wrote:
Again, in my opinion, all time date should be recorded in GMT.
It depends on context. If you are studying traffic flow or
electricity usage, then you want local time with all its warts
(perhaps stated as time since
Great!
Thank you!
I think the function with the C-like function should do the trick.
On Tue, Aug 12, 2014 at 4:31 PM, John McKown john.archie.mck...@gmail.com
wrote:
On Tue, Aug 12, 2014 at 3:23 PM, William Dunlap wdun...@tibco.com wrote:
Again, in my opinion, all time date should be
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