#z is my raggidy zoo series
min15 <- times("00:15:00")
trunc(index(z), min15)
This looks like what I want I am just truncating the index to the
nearest 15 min interval. a quick check with length confirms that they
are both of the same length. I am just checking to make sure that I
am not missing something. Thank you very much for your help.
Stephen
On Mon, Jun 28, 2010 at 5:05 PM, Gabor Grothendieck
<ggrothendi...@gmail.com> wrote:
> On Mon, Jun 28, 2010 at 5:52 PM, stephen sefick <ssef...@gmail.com> wrote:
>> Gabor,
>> This is very close, but it interpolates values that do not exist in
>> the original series. Is there a way to just "snap" the series to a
>> grid without interpolating?
>>
>
> Just round up or down the times with trunc. Using z from my prior
> post this rounds up to the next 10 minute boundary. (If there are
> multiple data values in a 10 minute interval it takes the last value.)
>
> min10 <- times("00:10:00")
> halfsec <- times("00:00:01")/2
> aggregate(z, trunc(time(z) + as.numeric(min10 - halfsec), min10),
> function(x) tail(x, 1))
>
>
> If there is only data value in each 10 minute interval this will round
> it up. If there are multiple data values in an interval it it takes
> the last one.
>
--
Stephen Sefick
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