public void TestExpandToOneHot()
{
var df = new DataFrame();
var column = new DataFrameColumn <int>(null, new int[] { 1, 2, 3 });
df.DefineNewColumn("a", column);
df.ExpandToOneHot("a", 4);
Assert.AreEqual(3, df.RowCount);
Assert.AreEqual(4, df.ColumnCount);
Assert.AreEqual(0, df["a_0"].GetObject(0));
Assert.AreEqual(1, df["a_1"].GetObject(0));
Assert.AreEqual(0, df["a_2"].GetObject(0));
Assert.AreEqual(0, df["a_3"].GetObject(0));
Assert.AreEqual(0, df["a_0"].GetObject(1));
Assert.AreEqual(0, df["a_1"].GetObject(1));
Assert.AreEqual(1, df["a_2"].GetObject(1));
Assert.AreEqual(0, df["a_3"].GetObject(1));
Assert.AreEqual(0, df["a_0"].GetObject(2));
Assert.AreEqual(0, df["a_1"].GetObject(2));
Assert.AreEqual(0, df["a_2"].GetObject(2));
Assert.AreEqual(1, df["a_3"].GetObject(2));
}
protected override void EndProcessing()
{
var df = new DataFrame();
if (Transpose)
{
bool first = true;
foreach (int[] seq in Combinatorics.Sequences(Symbols, true))
{
if (first)
{
for (var column = 0; column < seq.Length; ++column)
{
df.AddColumn <int>("c" + column);
}
first = false;
}
for (var column = 0; column < seq.Length; ++column)
{
df.GetColumn(column).SetObject(column, seq[column]);
}
}
}
else
{
int column = 0;
foreach (int[] seq in Combinatorics.Sequences(Symbols, true))
{
df.DefineNewColumn("c" + column, new DataFrameColumn <int>(df, seq));
++column;
}
}
WriteObject(df);
}