private Double zeilensummenNorm()
    {
        Double sum = 0d;
        Double max = 0d;
        
        for (int t = 0; t < 2; t++)
        {
            for (int i = 0; i < 2; i++)
            {
                sum = sum + Math.abs(values[t][i]);
            }
            if (max.compareTo(sum) == -1)
                max = sum;
            
            sum = 0d;
        }
        return max;
    }