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str_off
2011 Nov 23
1
Density over time intervals
...minute of
the day and the duration of the online session:
data <- read.table("availability.csv", header=T, sep=",")
diff_online <- function(username)
{
user_on <- strptime(data$online_time[which(data$username==username)],
format="%Y-%m-%d %H:%M:%S");
user_off <- strptime(data$offline_time[which(data$username==username)],
format="%Y-%m-%d %H:%M:%S");
difftime(user_off, user_on, units="mins");
}
min.of.day <- function(dtstr) # minute of day
{
dt <- strptime(dtstr, format="%Y-%m-%d %H:%M:%S");
h <- a...