Cldr.Unit.Math.round

You're seeing just the function round, go back to Cldr.Unit.Math module for more information.
Link to this function

round(unit, places \\ 0, mode \\ :half_up)

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Specs

round(
  unit :: Cldr.Unit.t(),
  places :: non_neg_integer(),
  mode :: :down | :up | :ceiling | :floor | :half_even | :half_up | :half_down
) :: Cldr.Unit.t()

Rounds the value of a unit.

Options

  • unit is any unit returned by Cldr.Unit.new/2

  • places is the number of decimal places to round to. The default is 0.

  • mode is the rounding mode to be applied. The default is :half_up.

Returns

  • A %Unit{} of the same type as unit with a value that is rounded to the specified number of decimal places

Rounding modes

Directed roundings:

  • :down - Round towards 0 (truncate), eg 10.9 rounds to 10.0

  • :up - Round away from 0, eg 10.1 rounds to 11.0. (Non IEEE algorithm)

  • :ceiling - Round toward +∞ - Also known as rounding up or ceiling

  • :floor - Round toward -∞ - Also known as rounding down or floor

Round to nearest:

  • :half_even - Round to nearest value, but in a tiebreak, round towards the nearest value with an even (zero) least significant bit, which occurs 50% of the time. This is the default for IEEE binary floating-point and the recommended value for decimal.

  • :half_up - Round to nearest value, but in a tiebreak, round away from 0. This is the default algorithm for Erlang's Kernel.round/2

  • :half_down - Round to nearest value, but in a tiebreak, round towards 0 (Non IEEE algorithm)

Examples

iex> Cldr.Unit.round Cldr.Unit.new!(:yard, 1031.61), 1
#Cldr.Unit<:yard, 1031.6>

iex> Cldr.Unit.round Cldr.Unit.new!(:yard, 1031.61), 2
#Cldr.Unit<:yard, 1031.61>

iex> Cldr.Unit.round Cldr.Unit.new!(:yard, 1031.61), 1, :up
#Cldr.Unit<:yard, 1031.7>