MathPHP\Functions\Special::generalizedHypergeometric PHP Метод

    public static function generalizedHypergeometric(int $p, int $q, ...$params)
    {
        $n = count($params);
        if ($n !== $p + $q + 1) {
            $expected_num_params = $p + $q + 1;
            throw new Exception\BadParameterException("Number of parameters is incorrect. Expected {$expected_num_params}; got {$n}");
        }
        $a = array_slice($params, 0, $p);
        $b = array_slice($params, $p, $q);
        $z = $params[$n - 1];
        $tol = 1.0E-8;
        $n = 1;
        $sum = 0;
        $product = 1;
        do {
            $sum += $product;
            $a_sum = array_product(Single::add($a, $n - 1));
            $b_sum = array_product(Single::add($b, $n - 1));
            $product *= $a_sum * $z / $b_sum / $n;
            $n++;
        } while ($product / $sum > $tol);
        return $sum;
    }