Double Comparison Method Misbehaviour

Question

I have a code that populates 2 ArrayLists.

    x_i.Clear();

    x_j.Clear();

    for (int i = 0; i < iter; i++)

    {                   

        x_i.Add(Relax(((double)v_1[i] + (double)x_1[i])));

        x_j.Add(Relax(((double)v_2[i] + (double)x_2[i])));

    }

And Here is the relaxation step if that is necessary.

    private static double Relax(double eval)

            {

    

                if (eval < min)

                {

                    return min;

                }

                else if (eval > max)

                {

                    return max;

                }

                else

                {

                    return eval;

                }

            }

**max is set to 1.0 and min = 0.0** and the relaxation step sets eval to 0 if it is less than min and to 1 if it is more than max.

The problem is although the evaluation generates different numbers, the output of the x_i and x_j are always same. A sample run with some Console.WriteLine Will clear the problem.

    x_i Sans relax: 0.255135946560249 and Relax: 1.65849559394646

    x_j Sans relax: -0.297522860941407 and Relax: 1.65849559394646

    Added x_i: 1.658 and x_j: 1.658

And here is the code that generates the output:

    for (int i = 0; i < iter; i++)

    {

    Console.WriteLine("x_i Sans relax: {0} and Relax: {1}", ((double)v_1[i] + (double)x_1[i]), Relax(((double)v_1[i] + (double)x_1[i])));

    Console.WriteLine("x_j Sans relax: {0} and Relax: {1}", ((double)v_2[i] + (double)x_2[i]), Relax(((double)v_2[i] + (double)x_2[i])));

    x_i.Add(Relax(((double)v_1[i] + (double)x_1[i])));

    x_j.Add(Relax(((double)v_2[i] + (double)x_2[i])));

    Console.WriteLine("Added x_i: {0} and x_j: {1}",  string.Format("{0:0.000}",x_i[i]),  string.Format("{0:0.000}",x_j[i]));

    }

Why is the Relax() method generating spurious output? Please comment if any further information is required. Any help is highly appreciated.