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Add function to calculate win probability

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avitex 2017-11-29 13:02:40 +11:00
parent 0f013beaa3
commit 82bd9e54ba
1 changed files with 22 additions and 0 deletions
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lib/glicko.ex
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@ -33,6 +33,28 @@ defmodule Glicko do
@type new_rating_opts :: [system_constant: float, convergence_tolerance: float]
@doc """
Calculates the probability of a player winning against an opponent from a player and an opponent.
Returns a value between `0.0` and `1.0`.
"""
@spec win_probability(player :: Player.t, opponent :: Player.t) :: float
def win_probability(player, opponent) do
win_probability(player |> Player.rating(:v2), opponent |> Player.rating(:v2), opponent |> Player.rating_deviation(:v2))
end
@doc """
Calculates the probability of a player winning against an opponent from a player rating, opponent rating and opponent rating deviation.
Values provided for the player rating, opponent rating and opponent rating deviation must be *v2* based.
Returns a value between `0.0` and `1.0`.
"""
@spec win_probability(player_rating :: Player.rating, opponent_rating :: Player.rating, opponent_rating_deviation :: Player.rating_deviation) :: float
def win_probability(player_rating, opponent_rating, opponent_rating_deviation) do
calc_e(player_rating, opponent_rating, calc_g(opponent_rating_deviation))
end
@doc """
Generate a new rating from an existing rating and a series (or lack) of results.