执行计算，但结果只得到NaN

本文关键字：NaN 结果 计算 执行 | 更新日期: 2023-09-27 18:01:20

public double calculateStdErrorEst()
{
    double see = 0;
    double residualSquare = 0;
    CultureInfo culture = new CultureInfo("en-US");
    List<double> residualTotal = new List<double>();
    try
    {
        for (int i = 0; i < stockPctReturns.Count; i++)
        {
            // square root of all sums of predicted - actual or market - stock
            residualSquare = Math.Sqrt(Convert.ToDouble((marketPctReturns.ElementAt(i) - stockPctReturns.ElementAt(i)), culture));
            residualTotal.Add(Math.Round(residualSquare, 2, MidpointRounding.AwayFromZero));
        }
        see = residualTotal.Sum() / (stockPctReturns.Count - 2);
        see = Math.Sqrt(see);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
    return Math.Round(see, 2, MidpointRounding.AwayFromZero);
}

正如你所看到的，我试图将值四舍五入，这样我就可以保持数字小，但无论我尝试过什么，我一直得到NaN作为唯一的结果。我遗漏了什么吗?

执行计算，但结果只得到NaN

您可能试图从负值中获得平方根，这导致Math.Sqrt返回double.NaN。在调用Math.Sqrt之前使用Math.Abs:

residualSquare = Math.Sqrt(Math.Abs(Convert.ToDouble((marketPctReturns.ElementAt(i) - stockPctReturns.ElementAt(i)), culture)));
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