windows {diyar}

Windows and lengths

Description

Covert windows to and from case_lengths and recurrence_lengths.

Usage

epid_windows(date, lengths, episode_unit = "days")

epid_lengths(date, windows, episode_unit = "days")

index_window(date, from_last = FALSE)

Arguments

date

As used in episodes.

lengths

The duration (lengths) between a date and window.

episode_unit

Time unit of lengths. Options are "seconds", "minutes", "hours", "days", "weeks", "months" or "years". See diyar::episode_unit

windows

The range (windows) relative to a date for a given duration (length).

from_last

As used in episodes.

Details

epid_windows - returns the corresponding window for a given a date, and case_length or recurrence_length.

epid_lengths - returns the corresponding case_length or recurrence_length for a given date and window.

index_window - returns the corresponding case_length or recurrence_length for the date only.

index_window(date = x) is a convenience function for epid_lengths(date = x, window = x).

Value

number_line.

Examples

# Which `window` will a given `length` cover?
date <- Sys.Date()
epid_windows(date, 10)
epid_windows(date, number_line(5, 10))
epid_windows(date, number_line(-5, 10))
epid_windows(date, -5)


# Which `length` is required to cover a given `window`?
date <- number_line(Sys.Date(), Sys.Date() + 20)
epid_lengths(date, Sys.Date() + 30)
epid_lengths(date, number_line(Sys.Date() + 25, Sys.Date() + 30))
epid_lengths(date, number_line(Sys.Date() - 10, Sys.Date() + 30))
epid_lengths(date, Sys.Date() - 10)

# Which `length` is required to cover the `date`?
index_window(20)
index_window(number_line(15, 20))