Nothing
`weekly` <-
function (data, time, fun = sum, subject = NULL)
{
if (is.null(subject)) {
result <- aggregate(data, list(week(time)), fun)
names(result) <- c("Week", "Result")
}
else {
result <- aggregate(data, list(week(time), subject),
fun)
names(result) <- c("Week", "Subject", "Result")
}
result
}
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