public Datum(amatrix data) : this(data, default(Vector)) { }
public Datum(amatrix data, Vector value) : this(data, value, null) { }
public Selector(amatrix parent) { this.parent = parent; }
public Datum(amatrix data, Vector value, object context) { Value = value; Data = data.AsVector(); Context = context; }
public static void print(amatrix a) { a.Print(); }