Append (Superset)

Synopsis

This operator provides the same functionality as the Append operator from RapidMiner Core, but the attributes of the ExampleSets to be appended, do not have to be the same, or of the same type.

Description

This operator builds a merged ExampleSet from two or more ExampleSets by adding all examples into a combined ExampleSet. The attributes of the resulting ExampleSet will be a superset of all attributes in all ExampleSets.

If an attribute is not in one of the input ExampleSets, the values for the examples from the input ExampleSet will be set to missing values. If the types of attributes with the same name are different between the input ExampleSets the attribute in the resulting ExampleSet will be a nominal attribute and the values are parsed to nominal values.

If two attributes with different names have the same special role, only the first attribute will keep its role in the resulting ExampleSet. The role of the other attribute will be set to <role>_i with i a counter which is increased until the name of the role is unique (e.g. there are three attributes (names a,b,c) which all have role label. In the resulting ExampleSet, attribute 'a' will have role 'label', 'b' will have role 'label_1' and 'c' will have role 'label_2').

Input

example set

This operator can have multiple ExampleSet inputs. When one ExampleSet is connected, another input port becomes available which is ready to accept another ExampleSet. The order of inputs remains the same. Collections of ExampleSets can also be connected.

Output

merged set

The appended ExampleSet.