number v0.5.0 Number.SI

Provides functions for formatting numbers using SI notation.

Summary

Functions

exponent_to_prefix(number)
number_to_si(number, options \\ [])
number_to_si(number, list) :: String.t

Format numbers using SI notation

Parameters

  • number - A value to convert. Can be any value that implements Number.Conversion.to_float/1.

  • options - A keyword list of options. See the documentation below for all available options.

Options

  • :base - Use 1024 if you wish to format bytes. Default: 1000

  • :separator - The string to place between the scaled number and the

             prefix + unit. Perhaps you want a space here. Default: ""
  • :unit - The unit of measurement, e.g. “M” for Meters. Default: “”

  • :precision - The number of decimal places to include. Default: 2

  • :trim - Trim trailing zeros. Default: false

Default configuration for these options can be specified in the Number application configuration.

config :number, si: [
                  separator: " ",
                  precision: 4,
                  trim: true
                ]

Examples

iex> Number.SI.number_to_si(1210000000, unit: "W")
"1.21GW"

iex> Number.SI.number_to_si(1210000000, unit: "W", precision: 1)
"1.2GW"

iex> Number.SI.number_to_si(1210000000, unit: "W", precision: 3, separator: " ")
"1.210 GW"

iex> Number.SI.number_to_si(1210000000, unit: "W", precision: 5, trim: true)
"1.21GW"

iex> Number.SI.number_to_si(1210000000)
"1.21G"

iex> Number.SI.number_to_si(Decimal.new(1210000000))
"1.21G"