@spec abs(number()) :: number()

Get the absolute value of a number

Examples

iex> Statistics.Math.abs(-4)
4copy

@spec ceil(number()) :: number()

Ceiling function

Examples

iex> Statistics.Math.ceil(3.999)
4.0copy

@spec combination(non_neg_integer(), non_neg_integer()) :: non_neg_integer()

The number of k combinations of n

Both arguments must be integers

Examples

iex> Statistics.Math.combination(10, 3)
120copy

@spec e() :: number()

The constant e

Examples

iex> Statistics.Math.e
2.718281828459045copy

@spec exp(number()) :: number()

Exponent function

Raise e to given power

Examples

iex> Statistics.Math.exp(5.6)
270.42640742615254copy

@spec factorial(non_neg_integer()) :: non_neg_integer()

Factorial!

@spec floor(number()) :: number()

Floor function

Examples

iex> Statistics.Math.floor(3.999)
3.0copy

@spec ln(number()) :: number()

The natural log

( from Erlang Math module)

Examples

iex> Statistics.Math.ln(20)
2.995732273553991
iex> Statistics.Math.ln(200)
5.298317366548036copy

@spec permutation(non_neg_integer(), non_neg_integer()) :: non_neg_integer()

The number of k permuations of n

Examples

iex> Statistics.Math.permutation(10, 3)
720copy

@spec pi() :: number()

The constant pi

(returned from Erlang Math module)

Examples

iex> Statistics.Math.pi
3.141592653589793copy

@spec pow(number(), number()) :: number()

Get power from Erlang

This is needed because Elixir doesn't currently have the ** operator

Examples

iex> Statistics.Math.pow(2,3)
8.0
iex> Statistics.Math.pow(9,9)
387420489.0
iex> Statistics.Math.pow(2,0)
1
iex> Statistics.Math.pow(-2, 1.5)
-2.8284271247461903
iex> Statistics.Math.pow(0, 5)
0copy

@spec rand() :: number()

Get a random number from erlang

@spec round(number(), number()) :: number()

Round a decimal to a specific precision

Examples

iex> Statistics.Math.round(0.123456, 4)
0.1235copy

@spec sqrt(number()) :: number()

Get square root

return sqrt from Erlang

Examples

iex> Statistics.Math.sqrt(9)
3.0
iex> Statistics.Math.sqrt(99)
9.9498743710662copy

@spec to_int(number()) :: integer()

Get the base integer from a float

Examples

iex> Statistics.Math.to_int(66.6666)
66copy