From 651c339cedb7a6e09cf7209a538ab5aca7046711 Mon Sep 17 00:00:00 2001 From: Kiana Sheibani Date: Sat, 23 Sep 2023 02:36:28 -0400 Subject: [PATCH] Write score calculation code --- cli/src/datasets.rs | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/cli/src/datasets.rs b/cli/src/datasets.rs index b0098e6..373c172 100644 --- a/cli/src/datasets.rs +++ b/cli/src/datasets.rs @@ -24,3 +24,32 @@ pub fn new_dataset(dataset: &Path) -> sqlite::Result { connection.execute(query)?; Ok(connection) } + +// Score calculation + +/// Calculate the collective expected score for each team. +fn expected_scores(ratings: &Teams<&mut f64>) -> Vec { + let qs: Vec = ratings + .into_iter() + .map(|es| 10_f64.powf(es.iter().map(|x| **x).sum::() / es.len() as f64 / 400.0)) + .collect(); + let sumq: f64 = qs.iter().sum(); + qs.into_iter().map(|q| q / sumq).collect() +} + +/// Adjust the ratings of each player based on who won. +fn adjust_ratings(ratings: Teams<&mut f64>, winner: usize) { + let exp_scores = expected_scores(&ratings); + + ratings + .into_iter() + .zip(exp_scores.into_iter()) + .enumerate() + .for_each(|(i, (es, exp_sc))| { + let len = es.len() as f64; + let score = f64::from(winner == i); + es.into_iter() + .for_each(|e| *e += 40.0 * (score - exp_sc) / len); + }) +} +