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8 <title>tournament_select_one (Population)
</title>
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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"><<</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">"Winner = #{winner} in #{length} moves. Game had #{player_count} players
"</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">></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>