MathPHP\Statistics\Regression\Methods\LeastSquares::createDesignMatrix PHP Метод

    public function createDesignMatrix($xs) : Matrix
    {
        if (is_int($xs) || is_float($xs)) {
            $xs = [$xs];
        }
        $X = new VandermondeMatrix($xs, $this->p + 1);
        if ($this->fit_constant == 0) {
            $X = $X->columnExclude(0);
        }
        return $X;
    }