MathPHP\LinearAlgebra\Vector::crossProduct PHP Метод

    public function crossProduct(Vector $B)
    {
        if ($B->getN() !== 3 || $this->n !== 3) {
            throw new Exception\VectorException('Vectors must have 3 items');
        }
        $s1 = $this->A[1] * $B[2] - $this->A[2] * $B[1];
        $s2 = -($this->A[0] * $B[2] - $this->A[2] * $B[0]);
        $s3 = $this->A[0] * $B[1] - $this->A[1] * $B[0];
        return new Vector([$s1, $s2, $s3]);
    }