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Update elo.md

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Angelos Chalaris
2018-06-23 10:17:42 +03:00
committed by GitHub
parent 49b8c11f36
commit 030d1a057d
1 changed files with 4 additions and 7 deletions
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11
snippets/elo.md
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@ -15,17 +15,14 @@ const elo = ([...ratings], kFactor = 32, selfRating) => {
const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400));
const newRating = (rating, i) =>
(selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));
if (ratings.length === 2) {
return [newRating(a, 1), newRating(b, 0)];
}
for (let i = 0, l = ratings.length; i < l; i++) {
}
for (let i = 0, len = ratings.length; i < len; i++) {
let j = i;
while (j < l - 1) {
[ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
while (j < len - 1) {
j++;
[ratings[i], ratings[j + 1]] = elo([ratings[i], ratings[j + 1]], kFactor);
}
}