pocketmine\math\Matrix::determinant PHP Method

    public function determinant()
    {
        if ($this->isSquare() !== true) {
            return false;
        }
        switch ($this->rows) {
            case 1:
                return 0;
            case 2:
                return $this->matrix[0][0] * $this->matrix[1][1] - $this->matrix[0][1] * $this->matrix[1][0];
            case 3:
                return $this->matrix[0][0] * $this->matrix[1][1] * $this->matrix[2][2] + $this->matrix[0][1] * $this->matrix[1][2] * $this->matrix[2][0] + $this->matrix[0][2] * $this->matrix[1][0] * $this->matrix[2][1] - $this->matrix[2][0] * $this->matrix[1][1] * $this->matrix[0][2] - $this->matrix[2][1] * $this->matrix[1][2] * $this->matrix[0][0] - $this->matrix[2][2] * $this->matrix[1][0] * $this->matrix[0][1];
        }
        return false;
    }