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code from last night

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0 parents commit 476accaf3916416273f42c1ef9730dd3269895bc @ninjudd committed Apr 29, 2011
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  1. +8 −0 .gitignore
  2. +227 −0 LICENSE
  3. +14 −0 README.md
  4. +3 −0 project.clj
  5. +62 −0 sample.elo
  6. +41 −0 src/elo/core.clj
8 .gitignore
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+.cake
+pom.xml
+*.jar
+*.war
+lib
+classes
+build
+./elo
227 LICENSE
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+Eclipse Public License - v 1.0
+
+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE
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+more than one year after the cause of action arose. Each party waives
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14 README.md
@@ -0,0 +1,14 @@
+# Elo Rating System
+
+Code from the April 2011 Clojure/Scala hackthon in Los Angeles.
+
+# Resources
+
+http://www.chesselo.com/
+http://en.wikipedia.org/wiki/Elo_rating_system
+http://collabedit.com/6wf2x
+
+# Usage
+
+ (require 'elo.core)
+ (elo.core/process-file "sample.elo")
3 project.clj
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+(defproject elo "0.0.1-SNAPSHOT"
+ :description "TODO: add summary of your project"
+ :dependencies [[clojure "1.2.0"]])
62 sample.elo
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+playerB playerA outcome
+justin aaron A
+lance justin A
+chun chris B
+chun chris
+chun chris A
+chun justin A
+chun justin B
+chun justin A
+michael aaron B
+michael aaron B
+chris aaron A
+chris aaron A
+chris justin A
+chris justin B
+justin aaron A
+lance justin A
+chun chris B
+chun chris D
+chun chris A
+chun justin A
+chun justin B
+chun justin A
+chun chris D
+michael aaron B
+michael aaron B
+chris aaron A
+chris aaron A
+chris justin A
+eric justin B
+eric justin B
+eric justin b
+chris justin B
+justin amos A
+justin eric A
+justin aaron A
+lance justin A
+chun chris B
+chun chris D
+chun chris A
+chun justin A
+chun justin B
+chun justin A
+chun chris D
+michael aaron B
+michael aaron B
+chris aaron A
+chris aaron A
+chris justin A
+eric justin B
+eric justin B
+eric justin b
+chris justin B
+justin amos A
+justin eric A
+c++ clojure A
+c++ java A
+c++ justin A
+c++ chun A
+c++ chris A
+c++ aaron A
+c++ 撮りためた A
41 src/elo/core.clj
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+(ns elo.core
+ (:use [clojure.java.io :only [reader]]
+ [clojure.string :only [split upper-case]]))
+
+(def *k-factor* 32)
+
+(def *starting-score* 1200)
+
+(defn expected-result [a b]
+ (/ 1 (+ 1 (Math/pow 10 (/ (- a b) 400)))))
+
+(defn score-change [a b result]
+ (* *k-factor* (- result (expected-result a b))))
+
+(defn update-scores [scores {:keys [playerA playerB outcome]}]
+ (let [a (or (scores playerA) *starting-score*)
+ b (or (scores playerB) *starting-score*)
+ delta (Math/round (score-change a b outcome))]
+ (-> scores
+ (assoc playerA (- a delta))
+ (assoc playerB (+ b delta)))))
+
+(defn to-result [str]
+ (case (upper-case (or str "d"))
+ "A" 0.0
+ "B" 1.0
+ 0.5))
+
+(defn game-seq [file]
+ (let [lines (line-seq (reader file))
+ keys (map keyword (split (first lines) #"\s+"))]
+ (for [line (rest lines)]
+ (let [vals (split line #"\s+")]
+ (update-in (zipmap keys vals) [:outcome] to-result)))))
+
+(defn process-file [file k-factor starting-score]
+ (binding [*k-factor* k-factor
+ *starting-score* starting-score]
+ (reduce update-scores
+ {}
+ (game-seq file))))

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