MathPHP\LinearAlgebra\Matrix::columnMultiply PHP Method

    public function columnMultiply(int $nᵢ, int $k) : Matrix
    {
        if ($nᵢ >= $this->n) {
            throw new Exception\MatrixException('Column to multiply does not exist');
        }
        if ($k == 0) {
            throw new Exception\BadParameterException('Multiplication factor k must not be 0');
        }
        $m = $this->m;
        $R = $this->A;
        for ($i = 0; $i < $m; $i++) {
            $R[$i][$nᵢ] *= $k;
        }
        return MatrixFactory::create($R);
    }