Label numbers in decimal format (e.g. 0.12, 1,234)

Use label_number() force decimal display of numbers (i.e. don't use scientific notation). label_comma() is a special case that inserts a comma every three digits.

label_number(accuracy = NULL, scale = 1, prefix = "", suffix = "",
  big.mark = " ", decimal.mark = ".", trim = TRUE, ...)

label_comma(accuracy = NULL, scale = 1, prefix = "", suffix = "",
  big.mark = ",", decimal.mark = ".", trim = TRUE, digits, ...)

comma(x, accuracy = NULL, scale = 1, prefix = "", suffix = "",
  big.mark = ",", decimal.mark = ".", trim = TRUE, digits, ...)

number_format(accuracy = NULL, scale = 1, prefix = "", suffix = "",
  big.mark = " ", decimal.mark = ".", trim = TRUE, ...)

comma_format(accuracy = NULL, scale = 1, prefix = "", suffix = "",
  big.mark = ",", decimal.mark = ".", trim = TRUE, digits, ...)

Arguments

accuracy	A number to round to. Use (e.g.) 0.01 to show 2 decimal places of precision. If NULL, the default, uses a heuristic that should ensure breaks have the minimum number of digits needed to show the difference between adjacent values. Applied to rescaled data.
scale	A scaling factor: x will be multiplied by scale before formating. This is useful if the underlying data is very small or very large.
prefix, suffix	Symbols to display before and after value.
big.mark	Character used between every 3 digits to separate thousands.
decimal.mark	The character to be used to indicate the numeric decimal point.
trim	Logical, if FALSE, values are right-justified to a common width (see base::format()).
...	Other arguments passed on to base::format().
digits	Deprecated, use accuracy instead.
x	A numeric vector to format.

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.

Old interface

number_format(), comma_format(), and comma() are retired; please use label_number() and label_comma() instead.

Examples

demo_continuous(c(-1e6, 1e6))
#> scale_x_continuous()
demo_continuous(c(-1e6, 1e6), labels = label_number())
#> scale_x_continuous(labels = label_number())
demo_continuous(c(-1e6, 1e6), labels = label_comma())
#> scale_x_continuous(labels = label_comma())

# Use scale to rescale very small or large numbers to generate
# more readable labels
demo_continuous(c(0, 1e6), labels = label_number())
#> scale_x_continuous(labels = label_number())
demo_continuous(c(0, 1e6), labels = label_number(scale = 1 / 1e3))
#> scale_x_continuous(labels = label_number(scale = 1/1000))
demo_continuous(c(0, 1e-6), labels = label_number())
#> scale_x_continuous(labels = label_number())
demo_continuous(c(0, 1e-6), labels = label_number(scale = 1e6))
#> scale_x_continuous(labels = label_number(scale = 1e+06))

# You can use prefix and suffix for other types of display
demo_continuous(c(32, 212), label = label_number(suffix = "\u00b0F"))
#> scale_x_continuous(label = label_number(suffix = "°F"))
demo_continuous(c(0, 100), label = label_number(suffix = "\u00b0C"))
#> scale_x_continuous(label = label_number(suffix = "°C"))