MathPHP\LinearAlgebra\Matrix::oneNorm PHP Method

    public function oneNorm()
    {
        $n = $this->n;
        $‖A‖₁ = array_sum(Map\Single::abs(array_column($this->A, 0)));
        for ($j = 1; $j < $n; $j++) {
            $‖A‖₁ = max($‖A‖₁, array_sum(Map\Single::abs(array_column($this->A, $j))));
        }
        return $‖A‖₁;
    }