Joao P Dubas
500d0e89bb
Some checks failed
continuous-integration/drone/pr Build is failing
1. calculate age in days, weeks, and months 2. calculate body mass index for metric and english unities 3. calculate z-score for a given measurement and box-cox parameters (l, m, s) 4. calculate centile score for a given measurement and box-cox parameters
30 lines
849 B
Elixir
30 lines
849 B
Elixir
defmodule Growth.Calc.BMI do
|
|
@moduledoc """
|
|
Calculate body mass index
|
|
"""
|
|
|
|
@inch_to_centimeter 2.54
|
|
@pound_to_kilogram 0.453592
|
|
|
|
@doc """
|
|
Calculate the body mass index for a given weight and height.
|
|
|
|
Measurements taken in english unit (pounds and inches) are converted to their metric equivalents (kilograms and centimeters).
|
|
"""
|
|
@spec calculate(:english | :metric, number, number) :: number
|
|
|
|
def calculate(:english, weight, height) do
|
|
metric_weight = pound_to_kilogram(weight)
|
|
metric_height = inches_to_centimeters(height)
|
|
calculate(:metric, metric_weight, metric_height)
|
|
end
|
|
|
|
def calculate(:metric, weight, height) do
|
|
weight / :math.pow(height / 100.0, 2)
|
|
end
|
|
|
|
defp inches_to_centimeters(height), do: height * @inch_to_centimeter
|
|
|
|
defp pound_to_kilogram(weight), do: weight * @pound_to_kilogram
|
|
end
|