Question

我有这样的System.Runtime.InteropServices.COMException : Error HRESULT E_FAIL has been returned from a call to a COM component. at MS.Win32.UnsafeNativeMethods.IWebBrowser2.Navigate2(Object& URL, Object& flags, Object& targetFrameName, Object& postData, Object& headers) at System.Windows.Controls.WebBrowser.DoNavigate(Uri source, Object& targetFrameName, Object& postData, Object& headers, Boolean ignoreEscaping) at MyApp.Views.BrowserView.Open(Uri uri)：

df

我想比较A B C D E F 2 a1 a2 a3 a4 100 2 a1 b2 c3 a4 100 # note 2 b1 b2 b3 b4 100 2 c1 c2 c3 c4 100 1 a1 a2 a3 a4 120 2 a1 b2 c3 a4 150 # note 1 b1 b2 b3 b4 130 1 c1 c2 c3 c4 110 0 a1 a2 a3 a4 80列与B-E列匹配的F列的结果，如下所示：

由于第一行在A B C D E F diff 2 a1 a2 a3 a4 100 120/100 2 a1 b2 c3 a4 100 # note 150/100 2 b1 b2 b3 b4 100 130/100 2 c1 c2 c3 c4 100 110/100 1 a1 a2 a3 a4 120 80/120 1 a1 b2 c3 a4 150 # note 1 b1 b2 b3 b4 130 1 c1 c2 c3 c4 110 0 a1 a2 a3 a4 80为A的第一行中具有相同的值，所以我执行1。

我尝试过的事情：

120/100-这将数据分组，但是我不知道如何应用计算列df.groupby(['B',' 'C', 'D', 'E'])的先前值的逻辑。或者也许有一种更简单的方法来实现它。

Answer 1

将DataFrameGroupBy.shift与Series.div一起使用：

public static void SetTickSpacing(Axis axis, int numTicks, int precision)
{
    double maxValue = double.MinValue;
    double minValue = double.MaxValue;

    foreach (Series series in AllSeries)
    {
        maxValue = Math.Max(GetMaxValue(series, GetAxisOrientation(axis)), maxValue);
        minValue = Math.Min(GetMinValue(series, GetAxisOrientation(axis)), minValue);
    }

    double range = maxValue - minValue;
    double spacing = range / numTicks;
    spacing = Math.Round(spacing / 10, precision) * 10;
    axis.Separator.Step = spacing;
}

public static int GetNumTicksByPixelSpacing(Axis axis, int pixelSpacing)
{
    double pixelSize;

    if (GetAxisOrientation(axis) == AxisOrientation.X)
    {
        int index = GetAxisIndexByName(GetAxisCollection(AxisOrientation.X), axis.Name);
        pixelSize = cartesianChart.AxisX[index].Width;   // this returns NaN
    }
    else
    {
        int index = GetAxisIndexByName(GetAxisCollection(AxisOrientation.Y), axis.Name);
        pixelSize = cartesianChart.AxisY[index].Height;   // this returns NaN
    }

    return (int)Math.Round(pixelSize / pixelSpacing);
}

将结果与分组后的先前结果进行比较

1 个答案: