/// <summary>
/// For a frame of type Frame<TRow,TCol> mutate its rows of type TVal and create a new column with the results
/// </summary>
/// <typeparam name="TRow">Row Type</typeparam>
/// <typeparam name="TVal">Value Type</typeparam>
/// <typeparam name="TCol">Column Type</typeparam>
/// <param name="myFrame"></param>
/// <param name="mutatorMethod">delegate for transformation</param>
/// <returns>Series<K, V></returns>
public static Series <TRow, TVal> Mutate <TRow, TVal, TCol>(this Frame <TRow, TCol> myFrame, Func <TVal[], TVal> mutatorMethod)
{
SeriesBuilder <TRow, TVal> result = new SeriesBuilder <TRow, TVal>();
foreach (TRow key in myFrame.Rows.Keys)
{
TVal colResult = mutatorMethod(myFrame.Rows[key].GetValues <TVal>().ToArray());
result.Add(key, colResult);
}
return(result.ToSeries());
}
private static Series <string, double> ColumnWiseSum(Frame <int, string> frame, string exclude)
{
var sb = new SeriesBuilder <string, double>();
foreach (string colname in frame.ColumnKeys)
{
double frequency = frame[colname].Sum();
if (!colname.Equals(exclude))
{
sb.Add(colname, frequency);
}
}
return(sb.ToSeries());
}