[R] as.day() Function (zoo question)
ssefick at gmail.com
Mon Sep 22 19:26:59 CEST 2008
On Mon, Sep 22, 2008 at 1:07 PM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> chron values are represented as day + fraction of a day so:
> try this:
> aggregate(z, floor, mean)
> On Mon, Sep 22, 2008 at 12:56 PM, stephen sefick <ssefick at gmail.com> wrote:
>> I am was going to look at the as.yearmon function in the zoo package
>> and write a as.day function to aggregate a time series of 96
>> observations per day into the mean for each day, but I don't know how
>> to look at the code so that I can convert it into something I can use.
>> On top of that I believe that it is probably an S3 method and I
>> haven't quite gotten that far in my programming experience.
>> How I want the mean for each day. the real data set has NA s randomly
>> 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"))
>> value <- rnorm(35040)
>> z <- zoo(value, tt)
>> Stephen Sefick
>> Research Scientist
>> Southeastern Natural Sciences Academy
>> 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
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
Southeastern Natural Sciences Academy
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.
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