private DataFrame MakeTestDataFrameWithParityAndTensColumns(int length)
{
DataFrame df = DataFrameTests.MakeDataFrameWithNumericColumns(length, false);
DataFrameColumn parityColumn = new StringDataFrameColumn("Parity", Enumerable.Range(0, length).Select(x => x % 2 == 0 ? "even" : "odd"));
DataFrameColumn tensColumn = new Int32DataFrameColumn("Tens", Enumerable.Range(0, length).Select(x => x / 10));
df.Columns.Insert(df.Columns.Count, parityColumn);
df.Columns.Insert(df.Columns.Count, tensColumn);
return(df);
}
public static DataFrame MakeDataFrameWithTwoColumns(int length, bool withNulls = true)
{
DataFrameColumn dataFrameColumn1 = new Int32DataFrameColumn("Int1", Enumerable.Range(0, length).Select(x => x));
DataFrameColumn dataFrameColumn2 = new Int32DataFrameColumn("Int2", Enumerable.Range(10, length).Select(x => x));
if (withNulls)
{
dataFrameColumn1[length / 2] = null;
dataFrameColumn2[length / 2] = null;
}
DataFrame dataFrame = new DataFrame();
dataFrame.Columns.Insert(0, dataFrameColumn1);
dataFrame.Columns.Insert(1, dataFrameColumn2);
return(dataFrame);
}
private static FxDataFrame CountCharacters(FxDataFrame dataFrame)
{
int characterCount = 0;
var characterCountColumn = new Int32DataFrameColumn("nameCharCount");
var ageColumn = new Int32DataFrameColumn("age");
ArrowStringDataFrameColumn nameColumn = dataFrame.Columns.GetArrowStringColumn("name");
for (long i = 0; i < dataFrame.Rows.Count; ++i)
{
characterCount += nameColumn[i].Length;
}
if (dataFrame.Rows.Count > 0)
{
characterCountColumn.Append(characterCount);
ageColumn.Append(dataFrame.Columns.GetInt32Column("age")[0]);
}
return(new FxDataFrame(ageColumn, characterCountColumn));
}
