Re: [R] cut.Date functionality for chron date/time objects

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Wed 03 Aug 2005 - 09:21:48 EST

Assuming, as in your post:

set.seed(123)
mychron <- chron(sort(runif(10, 0, 10))) breaks <- quantile(mychron)

# is one of these adequate?

cut(mychron, breaks)

cut(unclass(mychron), unclass(breaks), lab = FALSE)

On 8/2/05, Sebastian Luque <spluque@gmail.com> wrote:
> Hello,
>
> I've encountered the need to cut some chron objects of the form:
>
> R> mychron <- chron(sort(runif(10, 0, 10)))
> R> mychron
> [1] (01/01/70 16:36:20) (01/02/70 00:08:46) (01/03/70 16:54:49)
> [4] (01/04/70 06:45:00) (01/07/70 06:21:24) (01/07/70 18:28:44)
> [7] (01/08/70 00:47:05) (01/08/70 05:11:44) (01/10/70 01:07:53)
> [10] (01/10/70 17:46:53)
>
> into arbitrary (e.g. a given number of minutes, seconds, etc.) units.
> Basically, I'm searching for the functionality of cut.Date, which has a
> nice 'breaks' argument:
>
>
> ,-----[ *help[R](cut.Date)* (lines: 23 - 30) ]
> | breaks: a vector of cut points _or_ number giving the number of
> | intervals which 'x' is to be cut into _or_ an interval
> | specification, one of '"sec"', '"min"', '"hour"', '"day"',
> | '"DSTday"', '"week"', '"month"' or '"year"', optionally
> | preceded by an integer and a space, or followed by '"s"'.
> | For '"Date"' objects only '"day"', '"week"', '"month"' and
> | '"year"' are allowed.
> `-----
>
> 'cut.dates' (from chron itself) allows for cut'ing into months, years,
> etc., but not any fractions or multiples of these.
>
> Converting the chron objects to POSIXct (via 'as.POSIXct') and then using
> cut.Date works, but is inconvenient, as it introduces time zone
> information. Is there a better way to deal with this?
>
> Thanks in advance,
> --
> Sebastian P. Luque
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 03 09:31:34 2005

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