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public static double Sum(IEnumerable Values, int iStartIndex, int iEndIndex,
                                double dInitialValue)
        {
            double result = dInitialValue;
            if (iStartIndex < 0)
                throw new Exception("MathUtilities.Sum: End index or start index is out of range");
            int iIndex = 0;
            foreach (double Value in Values)
            {
                if (iIndex >= iEndIndex)
                    return result;
                if (iIndex >= iStartIndex && Value != MissingValue)
                    result += Value;
                iIndex++;
            }
            return result;
        }