diagonal.php

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<?php
 
namespace Matrix;
 
if (!function_exists(__NAMESPACE__ . '\\diagonal')) {
    function diagonal($matrix): Matrix
    {
        if (is_array($matrix)) {
            $matrix = new Matrix($matrix);
        }
        if (!$matrix instanceof Matrix) {
            throw new Exception('Must be Matrix or array');
        }
 
        return Functions::diagonal($matrix);
    }
}