# [R] How to calculate running 8-hour averages of temperature

arun smartpink111 at yahoo.com
Fri Oct 25 00:24:40 CEST 2013

Hi,
You may try
?rollmean from library(zoo)
?SMA from library(TTR)
dat1 <- structure(...
library(zoo)

res1 <- rollmean(dat1[-c(1:5),2],8)
library(TTR)
res2 <- SMA(dat1[-c(1:5),2],8)
all.equal(res1,res2[!is.na(res2)])
#[1] TRUE

A.K.

Hi,

How can I calculate running 8-hour averages of temperature
values that start at specific date and time? In the example data set
shown below I want to start the calculation on May 31, at 5pm (row 6).
Reproducible data is provided.

Thanks
structure(list(date = structure(c(644148000, 644151600, 644155200,
644158800, 644162400, 644166000, 644169600, 644173200, 644176800,
644180400, 644184000, 644187600, 644191200, 644194800, 644198400,
644202000, 644205600, 644209200, 644212800, 644216400, 644220000,
644223600, 644227200, 644230800, 644234400, 644238000, 644241600,
644245200, 644248800, 644252400, 644256000), class = c("POSIXct",
"POSIXt"), tzone = ""), temp = c(17.7, 18.3, 18.9, 19.7, 19.5,
19, 18.8, 18, 16.3, 15.1, 13.9, 12.7, 11.9, 10.6, 10, 8.7, 7.89999,
8.09999, 9.29999, 12.4, 14.5, 15.9, 17.4, 18.6, 18.3, 18.4, 18.5,
20.4, 19.7, 18.9, 18.1)), .Names = c("date", "temp"), row.names = 3613:3643, class = "data.frame")