Symmetric limits — symmetric

Expand scale limits to make them symmetric around zero. Can be passed as argument to parameter limits of continuous scales from packages {ggplot2} or {scales}. Can be also used to obtain an enclosing symmetric range for numeric vectors.

Usage

symmetric_limits(x)

Source

Adapted from the homonym function in {ggpmisc}

Arguments

x: a vector of numeric values, possibly a range, from which to compute enclosing range

Value

A numeric vector of length two with the new limits, which are always such that the absolute value of upper and lower limits is the same.

Examples

library(ggplot2)

ggplot(iris) +
  aes(x = Sepal.Length - 5, y = Sepal.Width - 3, colour = Species) +
  geom_vline(xintercept = 0) +
  geom_hline(yintercept = 0) +
  geom_point()


last_plot() +
  scale_x_continuous(limits = symmetric_limits) +
  scale_y_continuous(limits = symmetric_limits)