Here is one way of doing it:
> x <- data.frame(dates=seq(as.POSIXct('2008-09-08'), by='7 hours', length=10),
+ values=1:10)
> # split into days
> x.s <- split(x, format(x$dates, "%Y%m%d"))
> x.s
$`20080908`
dates values
1 2008-09-08 00:00:00 1
2 2008-09-08 07:00:00 2
?aggregate
?window.zoo
?rollapply
anyway have a look at package zoo
On Tue, Sep 9, 2008 at 3:25 PM, Alexy Khrabrov <[EMAIL PROTECTED]> wrote:
> Greetings -- I have a dataframe a with one element a vector, time, of
> POSIXct values. What's a good way to split the data frame into periods of
> a$ti
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