scale_units {units}

Position scales for units data

Description

These are the default scales for the units class. These will usually be added automatically. To override manually, use scale_*_units.

Usage

scale_x_units(..., guide = ggplot2::waiver(), position = "bottom",
  sec.axis = ggplot2::waiver(), unit = NULL)

scale_y_units(..., guide = ggplot2::waiver(), position = "left",
  sec.axis = ggplot2::waiver(), unit = NULL)

Arguments

...

arguments passed on to continuous_scale (e.g. scale transformations via the trans argument; see examples).

guide

A function used to create a guide or its name. See guides() for more information.

position

For position scales, The position of the axis. left or right for y axes, top or bottom for x axes.

sec.axis

sec_axis() is used to specify a secondary axis.

unit

A unit specification to use for the axis. If given, the values will be converted to this unit before plotting. An error will be thrown if the specified unit is incompatible with the unit of the data.

Examples

if (requireNamespace("ggplot2", quietly=TRUE)) {

library(ggplot2)

mtcars$consumption <- set_units(mtcars$mpg, mi / gallon)
mtcars$power <- set_units(mtcars$hp, hp)

# Use units encoded into the data
ggplot(mtcars) +
  geom_point(aes(power, consumption))

# Convert units on the fly during plotting
ggplot(mtcars) +
  geom_point(aes(power, consumption)) +
  scale_x_units(unit = "W") +
  scale_y_units(unit = "km/l")

# Resolve units when transforming data
ggplot(mtcars) +
  geom_point(aes(power, 1 / consumption))

# Reverse the y axis
ggplot(mtcars) +
  geom_point(aes(power, consumption)) +
  scale_y_units(trans="reverse")

}