[R] as.day() Function (zoo question)

stephen sefick ssefick at gmail.com
Mon Sep 22 18:56:23 CEST 2008

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

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