avitex/glicko-elixir
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Add e to results

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avitex 2017-11-16 13:12:13 +11:00
parent 7d46daf078
commit 66133e48d1
1 changed files with 12 additions and 11 deletions
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23
lib/glicko.ex
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@ -26,12 +26,14 @@ defmodule Glicko do
defp do_new_rating(player = %Player{version: :v2}, results, sys_constant) do defp do_new_rating(player = %Player{version: :v2}, results, sys_constant) do
results = Enum.map(results, fn result -> results = Enum.map(results, fn result ->
opponent = Player.to_v2(result.opponent) result =
%{ Map.new
score: result.score, |> Map.put(:opponent, Player.to_v2(result.opponent))
opponent: opponent, |> Map.put(:score, result.score)
opponent_rating_deviation_g: calc_g(opponent.rating_deviation),
} result = Map.put(result, :opponent_rating_deviation_g, calc_g(result.opponent.rating_deviation))
result = Map.put(result, :e, calc_e(player, result))
result
end) end)
ctx = ctx =
@ -74,11 +76,10 @@ defmodule Glicko do
end end
# Calculation of the estimated variance of the player's rating based on game outcomes # Calculation of the estimated variance of the player's rating based on game outcomes
defp calc_variance_estimate(%{player: player, results: results}) do defp calc_variance_estimate(%{results: results}) do
results results
|> Enum.reduce(0.0, fn result, acc -> |> Enum.reduce(0.0, fn result, acc ->
tmp_e = calc_e(player, result) acc + :math.pow(result.opponent_rating_deviation_g, 2) * result.e * (1 - result.e)
acc + :math.pow(result.opponent_rating_deviation_g, 2) * tmp_e * (1 - tmp_e)
end) end)
|> :math.pow(-1) |> :math.pow(-1)
end end
@ -102,9 +103,9 @@ defmodule Glicko do
:math.exp(a / 2) :math.exp(a / 2)
end end
defp calc_results_effect(%{player: player, results: results}) do defp calc_results_effect(%{results: results}) do
Enum.reduce(results, 0.0, fn result, acc -> Enum.reduce(results, 0.0, fn result, acc ->
acc + result.opponent_rating_deviation_g * (result.score - calc_e(player, result)) acc + result.opponent_rating_deviation_g * (result.score - result.e)
end) end)
end end