kejadlen · July 24, 2012 22:52
diff --git a/itunes.rb b/itunes.rb
 require 'rbosa'

 itunes = OSA.app('iTunes')

 music = itunes.current_playlist
 music.name  #=> "Music"
 tracks = music.tracks

 sum = tracks.inject(0) {|n,i| n + i.played_count }  #=> 3871
 average = sum / tracks.size.to_f  #=> 3.61100746268657

 std_dev = (tracks.map {|t| (t.played_count - average)**2 }.inject(0) {|n,i| n + i } / tracks.size.to_f)**0.5  #=> 5.63593796507849
	require 'rbosa'

	itunes = OSA.app('iTunes')

	music = itunes.current_playlist
	music.name #=> "Music"
	tracks = music.tracks

	sum = tracks.inject(0) {\|n,i\| n + i.played_count } #=> 3871
	average = sum / tracks.size.to_f #=> 3.61100746268657

	std_dev = (tracks.map {\|t\| (t.played_count - average)2 }.inject(0) {\|n,i\| n + i } / tracks.size.to_f)0.5 #=> 5.63593796507849