scales (version 1.4.0)

label_log: Label numbers in log format (10^3, 10^6, etc)

Description

label_log() and format_log() display numbers as base^exponent, using superscript formatting. label_log() returns expressions suitable for labelling in scales, whereas format_log() returns deparsed text.

Usage

label_log(base = 10, digits = 3, signed = NULL)
format_log(x, base = 10, signed = NULL, ...)

Value

All label_() functions return a "labelling" function, i.e. a function that takes a vector x and returns a character vector of length(x) giving a label for each input value.

Labelling functions are designed to be used with the labels argument of ggplot2 scales. The examples demonstrate their use with x scales, but they work similarly for all scales, including those that generate legends rather than axes.

Arguments

base

Base of logarithm to use

digits

Number of significant digits to show for the exponent. Argument is passed on to base::format().

signed

Should a + or - be displayed as a prefix? The default, NULL, displays signs if there are zeroes or negative numbers present.

x

A numeric vector to format

...

Passed on to format().

See Also

breaks_log() for the related breaks algorithm.

Other labels for log scales: label_bytes(), label_number_si(), label_scientific()

Examples

demo_log10(c(1, 1e5), labels = label_log())
demo_log10(c(1, 1e5), breaks = breaks_log(base = 2), labels = label_log(base = 2))
format_log(c(0.1, 1, 10))