num: Format a numeric vector

Description Usage Arguments See Also Examples

Description

[Experimental]

Constructs a numeric vector that can be formatted with predefined significant digits, or with a maximum or fixed number of digits after the decimal point. Scaling is supported, as well as forcing a decimal, scientific or engineering notation. If a label is given, it is shown in the header of a column.

The formatting is applied when the vector is printed or formatted, and also in a tibble column. The formatting annotation and the class survives most arithmetic transformations, the most notable exceptions are var() and sd().

Usage

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num(
  x,
  ...,
  sigfig = NULL,
  digits = NULL,
  label = NULL,
  scale = NULL,
  notation = c("fit", "dec", "sci", "eng", "si"),
  fixed_exponent = NULL,
  extra_sigfig = NULL
)

Arguments

x

A numeric vector.

...

These dots are for future extensions and must be empty.

sigfig

Define the number of significant digits to show. Must be one or greater. The "pillar.sigfig" option is not consulted. Can't be combined with digits.

digits

Number of digits after the decimal points to show. Positive numbers specify the exact number of digits to show. Negative numbers specify (after negation) the maximum number of digits to show. With digits = 2, the numbers 1.2 and 1.234 are printed as 1.20 and 1.23, with digits = -2 as 1.2 and 1.23, respectively. Can't be combined with sigfig.

label

A label to show instead of the type description.

scale

Multiplier to apply to the data before showing. Useful for displaying e.g. percentages. Must be combined with label.

notation

One of "fit", "dec", "sci", "eng", or "si".

  • "fit": Use decimal notation if it fits and if it consumes 13 digits or less, otherwise use scientific notation. (The default for numeric pillars.)

  • "dec": Use decimal notation, regardless of width.

  • "sci": Use scientific notation.

  • "eng": Use engineering notation, i.e. scientific notation using exponents that are a multiple of three.

  • "si": Use SI notation, prefixes between 1e-24 and 1e24 are supported.

fixed_exponent

Use the same exponent for all numbers in scientific, engineering or SI notation. -Inf uses the smallest, +Inf the largest fixed_exponent present in the data. The default is to use varying exponents.

extra_sigfig

If TRUE, increase the number of significant digits if the data consists of numbers of the same magnitude with subtle differences.

See Also

Other vector classes: char()

Examples

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# Display as a vector
num(9:11 * 100 + 0.5)

# Significant figures
tibble(
  x3 = num(9:11 * 100 + 0.5, sigfig = 3),
  x4 = num(9:11 * 100 + 0.5, sigfig = 4),
  x5 = num(9:11 * 100 + 0.5, sigfig = 5),
)

# Maximum digits after the decimal points
tibble(
  x0 = num(9:11 * 100 + 0.5, digits =  0),
  x1 = num(9:11 * 100 + 0.5, digits = -1),
  x2 = num(9:11 * 100 + 0.5, digits = -2),
)

# Use fixed digits and a currency label
tibble(
  usd = num(9:11 * 100 + 0.5, digits = 2, label = "USD"),
  gbp = num(9:11 * 100 + 0.5, digits = 2, label = "£"),
  chf = num(9:11 * 100 + 0.5, digits = 2, label = "SFr")
)

# Scale
tibble(
  small  = num(9:11 / 1000 + 0.00005, label = "%", scale = 100),
  medium = num(9:11 /  100 + 0.0005 , label = "%", scale = 100),
  large  = num(9:11 /   10 + 0.005  , label = "%", scale = 100)
)

# Notation
tibble(
  sci = num(10^(-13:6), notation = "sci"),
  eng = num(10^(-13:6), notation = "eng"),
  si  = num(10^(-13:6), notation = "si"),
  dec = num(10^(-13:6), notation = "dec")
)

# Fixed exponent
tibble(
  scimin = num(10^(-7:6) * 123, notation = "sci", fixed_exponent = -Inf),
  engmin = num(10^(-7:6) * 123, notation = "eng", fixed_exponent = -Inf),
  simin  = num(10^(-7:6) * 123, notation = "si",  fixed_exponent = -Inf)
)

tibble(
  scismall = num(10^(-7:6) * 123, notation = "sci", fixed_exponent = -3),
  scilarge = num(10^(-7:6) * 123, notation = "sci", fixed_exponent = 3),
  scimax   = num(10^(-7:6) * 123, notation = "sci", fixed_exponent = Inf)
)

#' Extra significant digits
tibble(
  default = num(100 + 1:3 * 0.001),
  extra1 = num(100 + 1:3 * 0.001, extra_sigfig = TRUE),
  extra2 = num(100 + 1:3 * 0.0001, extra_sigfig = TRUE),
  extra3 = num(10000 + 1:3 * 0.00001, extra_sigfig = TRUE)
)

tibble documentation built on Sept. 30, 2021, 5:08 p.m.