private double getNikRecursion double int int if if isEqualNull Math A

	private double getNikRecursion(double t, int i, int k)
        {
            if (k == 1)
            {
                if (isEqualNull(Math.Abs(knots[i] - t)) || (knots[i] < t && t < knots[i + 1]))
                {
                    return 1;
                }
                else
                {
                    return 0;
                }
            }

            double numerator1 = (t - knots[i]) * getNikRecursion(t, i, k - 1),
                   znam1 = knots[i + k - 1] - knots[i];

            double numerator2 = (knots[i + k] - t) * getNikRecursion(t, i + 1, k - 1),
                   znam2 = knots[i + k] - knots[i + 1];

            double proportion1, proportion2;

            if (isEqualNull(numerator1) || isEqualNull(znam1))
            {
                proportion1 = 0;
            }
            else
            {
                proportion1 = numerator1 / znam1;
            }

            if (isEqualNull(numerator2) || isEqualNull(znam2))
            {
                proportion2 = 0;
            }
            else
            {
                proportion2 = numerator2 / znam2;
            }

            double curN = proportion1 + proportion2;

            return curN;
        }