[R] generating a sequence of seconds

[John McKown]

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 <wdunlap at tibco.com> wrote:
>> 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 the seconds-since-1970 numbers around
> 1414918800?  Or is there another problem you want solved?
>
> Note that the number of seconds in a day depends on the day and the
> time zone.  In US/Pacific time I get:
>
>   > length(seq(from=as.POSIXct("2014-08-12
> 00:00:00"),to=as.POSIXct("2014-08-12 23:59:59"), by="secs"))
>   [1] 86400
>   > length(seq(from=as.POSIXct("2014-03-09
> 00:00:00"),to=as.POSIXct("2014-03-09 23:59:59"), by="secs"))
>   [1] 82800
>   > length(seq(from=as.POSIXct("2014-11-02
> 00:00:00"),to=as.POSIXct("2014-11-02 23:59:59"), by="secs"))
>   [1] 90000
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
>
> On Tue, Aug 12, 2014 at 11:51 AM, Erin Hodgess <erinm.hodgess at 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 seconds vector without the date, please?  Is there
>> a convenient way to create such a vector, please?
>>
>> thanks,
>> Erin
>>
>>
>> --
>> Erin Hodgess
>> Associate Professor
>> Department of Mathematical and Statistics
>> University of Houston - Downtown
>> mailto: erinm.hodgess at gmail.com
>>
>>         [[alternative HTML version deleted]]
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> 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.



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John McKown