add decay when results are empty and retab file

rb/glicko2.rb

@@ -1,4 +1,4 @@
-#!/usr/bin/env ruby
+#!/usr/bin/env ruby -w
 
 #
 #
@@ -136,9 +136,6 @@ class Glicko2
       add_result(opponent,Glicko2::DRAW)
     end
 
-		# Update rating based on current results list, and clear results.
-		def update
-		
     # util func
     def Glicko2.g(deviation)
       1.0 / (Math.sqrt(1.0 + 3.0 * deviation ** 2.0 / (Math::PI ** 2.0)))
@@ -149,9 +146,14 @@ class Glicko2
       1.0 / (1.0 + Math.exp(-Glicko2.g(deviation_opponent)*(rating - rating_opponent)));
     end
 
+    # Update rating based on current results list, and clear results.
+    def update
+      # util func
+
       # bail if no opponents set
       if @results.empty?
-				return nil
+        @g2deviation = Math.sqrt(@g2deviation**2.0 + @g2volatility**2.0)
+        return
       end
 
       # compute variance

rb/test_glicko2.rb

@@ -1,6 +1,6 @@
-#!/usr/bin/env ruby
+#!/usr/bin/env ruby -w
 
-require 'glicko2'
+require_relative 'glicko2'
 require 'test/unit'
 
 class TestGlicko2 < Test::Unit::TestCase
@@ -26,7 +26,7 @@ class TestGlicko2 < Test::Unit::TestCase
 		a.update()
 		
 		assert_in_delta(1464.05,a.rating,0.01)
-		assert_in_delta(151.516,a.deviation,0.01)
+		assert_in_delta(151.875,a.deviation,0.01)
 
 	end