まずはデータ・セットの作成

phpで学ぶ集合知プログラミング2.2

$critics=array('Lisa Rose'=> array('Lady in the Water' =>2.5, 'Snakes on a Plane' =>3.5,
    'Just My Luck'=> 3.0, 'Superman Returns'=> 3.5, 'You, Me and Dupree'=> 2.5,
    'The Night Listener'=> 3.0),
    'Gene Seymour' => array('Lady in the Water'=> 3.0, 'Snakes on a Plane'=> 3.5,
        'Just My Luck'=> 1.5, 'Superman Returns'=> 5.0, 'The Night Listener'=> 3.0,
        'You, Me and Dupree'=> 3.5),
    'Michael Phillips'=> array('Lady in the Water'=> 2.5, 'Snakes on a Plane'=> 3.0,
        'Superman Returns'=> 3.5, 'The Night Listener'=> 4.0),
    'Claudia Puig'=> array('Snakes on a Plane'=> 3.5, 'Just My Luck'=> 3.0,
        'The Night Listener'=> 4.5, 'Superman Returns'=> 4.0,
        'You, Me and Dupree'=> 2.5),
    'Mick LaSalle'=> array('Lady in the Water'=> 3.0, 'Snakes on a Plane'=> 4.0,
        'Just My Luck'=> 2.0, 'Superman Returns'=> 3.0, 'The Night Listener'=> 3.0,
        'You, Me and Dupree'=> 2.0),
    'Jack Matthews'=> array('Lady in the Water'=> 3.0, 'Snakes on a Plane'=> 4.0,
        'The Night Listener'=> 3.0, 'Superman Returns'=> 5.0, 'You, Me and Dupree'=> 3.5),
    'Toby'=> array('Snakes on a Plane'=>4.5,'You, Me and Dupree'=>1.0,'Superman Returns'=>4.0));