com.rapidminer.example.table
Class NominalAttribute

java.lang.Object
  com.rapidminer.example.table.AbstractAttribute
      com.rapidminer.example.table.NominalAttribute

All Implemented Interfaces:

Attribute, java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

BinominalAttribute, PolynominalAttribute

public abstract class NominalAttribute
extends AbstractAttribute

This class holds all information on a single nominal attribute. In addition to the generic attribute fields this class keeps information about the nominal values and the value to index mappings. If one of the methods designed for numerical attributes was invoked a RuntimeException will be thrown. It will be guaranteed that all values are mapped to indices without any missing values. This could, however, be changed in future versions thus operators should not rely on this fact.

Author:

Ingo Mierswa Exp $

See Also:

Serialized Form

Field Summary

Fields inherited from interface com.rapidminer.example.Attribute

MISSING_NOMINAL_VALUE, UNDEFINED_ATTRIBUTE_INDEX, VIEW_ATTRIBUTE_INDEX

Method Summary

java.lang.String	getAsString(double value, int digits, boolean quoteNominal) Returns a string representation and maps the value to a string if type is nominal.
boolean	isNominal() Returns true if the attribute is nominal.
boolean	isNumerical() Returns true if the attribute is nominal.

Methods inherited from class com.rapidminer.example.table.AbstractAttribute

addOwner, addTransformation, clearTransformations, clone, equals, getAllStatistics, getBlockType, getConstruction, getDefault, getLastTransformation, getName, getStatistics, getStatistics, getTableIndex, getValue, getValueType, hashCode, readResolve, registerStatistics, removeOwner, setBlockType, setConstruction, setDefault, setName, setTableIndex, setValue, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.rapidminer.example.Attribute

getMapping, setMapping

Method Detail

isNominal

public boolean isNominal()

Description copied from interface: Attribute

Returns true if the attribute is nominal.

isNumerical

public boolean isNumerical()

Description copied from interface: Attribute

Returns true if the attribute is nominal.

getAsString

public java.lang.String getAsString(double value,
                                    int digits,
                                    boolean quoteNominal)

Returns a string representation and maps the value to a string if type is nominal. The number of digits is ignored.