Re: [R] Date Time Sequence

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Thu, 26 Jun 2008 18:06:50 -0400

Try this:

library(chron)
t1 <- chron("1/1/2006", "00:00:00")
t2 <- chron("12/31/2006", "23:45:00")
deltat <- times("00:15:00")
tt <- seq(t1, t2, by = times("00:15:00"))

Note that if you have some data and your intention is simply to create the index for it so you can create a zoo or zooreg object then the zooreg constructor can do it for you. For example, a series of 10 values starting at t1 with successive points spaced 15 minutes apart is:

library(zoo)
zooreg(1:10, start = t1, deltat = as.numeric(deltat))

On Thu, Jun 26, 2008 at 5:36 PM, stephen sefick <ssefick_at_gmail.com> wrote:
> I would like a sequence of dates with a time step of 15 minutes
> starting:
> 1/1/2006 00:00:00 - 12/31/2006 23:45:00
>
> function(x) {
> chron(sub(" .*", "", x), gsub(".* (.*)", "\\1:00", x))
> }
>
> this is the piece of code I use to read in zoo objects
> for any help I would be grateful I have tried sequence and I can not seem
> to get it to work
>
> --
> Let's not spend our time and resources thinking about things that are so
> little or so large that all they really do for us is puff us up and make us
> feel like gods. We are mammals, and have not exhausted the annoying little
> problems of being mammals.
>
> -K. Mullis
>
> [[alternative HTML version deleted]]
>
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>



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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. Received on Thu 26 Jun 2008 - 22:09:28 GMT

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