scale_x_grates_isoweek: Isoweek scale

In grates: Grouped Date Classes

Isoweek scale

Description

ggplot2 scale for an ⁠<grates_isoweek>⁠ vector.

Usage

scale_x_grates_isoweek(
  ...,
  breaks = ggplot2::waiver(),
  n.breaks = 6L,
  format = NULL
)

Arguments

...	Not currently used.
breaks	A ⁠<grates_isoweek>⁠ vector of the desired breaks.
n.breaks	⁠[integer]⁠ Approximate number of breaks calculated using scales::breaks_pretty (default 6L). Will only have an effect if breaks = waiver().
format	Format to use if "Date" or year/week scales are required. If NULL (default) then labels are in the standard isoweek format (YYYY-Wxx). If "week" then the labels are of the form Www (e.g. W37). If "year" then labels are of the form YYYY (e.g. 2020). Otherwise the value is used by format.Date() and can be any input acceptable by that function. Note that when date scales are requested the grate labels are first coerced via as.Date().

Value

A scale for use with ggplot2.

Examples

# use simulated linelist data from the outbreaks package
linelist <- outbreaks::ebola_sim_clean$linelist
x <- as_isoweek(linelist$date_of_infection)
dat <- aggregate(list(cases = x), by = list(week = x), FUN = length)

# plot the output
(week_plot <-
    ggplot2::ggplot(dat, ggplot2::aes(week, cases)) +
    ggplot2::geom_col(width = 1, colour = "white") +
    ggplot2::theme_bw())

# We can have non-centred date labels on the x_axis by using the
# associated scale function and explicitly specifying a format for
# the date labels:
week_plot + scale_x_grates_isoweek(format = "%Y-%m-%d")

grates documentation built on Nov. 21, 2025, 5:07 p.m.