doc/classes/Population.src/M000016.html

   1 <?xml version="1.0" encoding="iso-8859-1"?>
   2 <!DOCTYPE html
   3      PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   4      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
   5
   6 <html>
   7 <head>
   8   <title>tournament_select_one (Population)</title>
   9   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
  10   <link rel="stylesheet" href="../.././rdoc-style.css" type="text/css" media="screen" />
  11 </head>
  12 <body class="standalone-code">
  13   <pre><span class="ruby-comment cmt"># File src/selection.rb, line 19</span>
  14   <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">tournament_select_one</span>(<span class="ruby-identifier">winner_success_chance</span> = <span class="ruby-value">0</span><span class="ruby-value">.8</span>, <span class="ruby-identifier">max_game_length</span>= <span class="ruby-value">1000</span>, <span class="ruby-identifier">verbose</span> = <span class="ruby-keyword kw">false</span>)
  15     <span class="ruby-identifier">player_count</span> = <span class="ruby-identifier">rand</span>(<span class="ruby-value">5</span>) <span class="ruby-operator">+</span> <span class="ruby-value">2</span>
  16     <span class="ruby-identifier">pool_size</span> = <span class="ruby-ivar">@individuals</span>.<span class="ruby-identifier">length</span>
  17     <span class="ruby-identifier">players</span> = []
  18     <span class="ruby-value">1</span>.<span class="ruby-identifier">upto</span>(<span class="ruby-identifier">player_count</span>) { <span class="ruby-identifier">players</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-ivar">@individuals</span>[<span class="ruby-identifier">rand</span>(<span class="ruby-identifier">pool_size</span>)].<span class="ruby-identifier">to_potential_player</span> }
  19     <span class="ruby-identifier">game</span> = <span class="ruby-constant">GameHandler</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">players</span>, <span class="ruby-identifier">max_game_length</span>, <span class="ruby-keyword kw">false</span>, <span class="ruby-keyword kw">false</span>)
  20     <span class="ruby-identifier">winner</span>, <span class="ruby-identifier">length</span> = <span class="ruby-identifier">game</span>.<span class="ruby-identifier">play</span>
  21     <span class="ruby-identifier">puts</span> <span class="ruby-node">&quot;Winner = #{winner} in #{length} moves.  Game had #{player_count} players&quot;</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">verbose</span>
  22     <span class="ruby-comment cmt"># If the game was a draw, or the winner is unlucky, pick a parent at random</span>
  23     <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">winner</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">:draw</span> <span class="ruby-keyword kw">or</span> <span class="ruby-identifier">rand</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">winner_success_chance</span>
  24       <span class="ruby-identifier">successful_player</span> = <span class="ruby-identifier">players</span>[<span class="ruby-identifier">rand</span>(<span class="ruby-identifier">player_count</span>)]
  25     <span class="ruby-keyword kw">else</span>
  26       <span class="ruby-identifier">successful_player</span> = <span class="ruby-identifier">winner</span>
  27     <span class="ruby-keyword kw">end</span>
  28     <span class="ruby-identifier">successful_player</span>
  29   <span class="ruby-keyword kw">end</span></pre>
  30 </body>
  31 </html>