Some useful math functions. These are generally used internally by the library.
Summary
Functions
Returns the binomial coefficient, the number of ways to choose k elements
from n
Returns the factorial of a number. Highly optimized for n < 30
Returns the multinomial coefficient, the number of ways to arrange groups of
counts interchangeable elements in a row
Functions
@spec binomial(non_neg_integer(), non_neg_integer()) :: non_neg_integer()
Returns the binomial coefficient, the number of ways to choose k elements
from n
Example
iex> binomial 5, 2
10
iex> binomial 2, 5
0@spec factorial(non_neg_integer()) :: pos_integer()
Returns the factorial of a number. Highly optimized for n < 30
Example
iex> factorial 5
120@spec multinomial([non_neg_integer()]) :: pos_integer()
Returns the multinomial coefficient, the number of ways to arrange groups of
counts interchangeable elements in a row
Example
iex> multinomial [2, 1]
3