Expand a range to make it symmetric

Source: R/scale-continuous-logFC.r

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.

symmetric_limits(x)

Arguments

x

numeric The automatic limits when used as argument to a scale's limits formal parameter. Otherwise a numeric vector, possibly a range, for which to compute a symmetric 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


symmetric_limits(c(-1, 1.8))
#> [1] -1.8  1.8
symmetric_limits(c(-10, 1.8))
#> [1] -10  10
symmetric_limits(-5:20)
#> [1] -20  20