weka.filters.unsupervised.attribute

Class NominalToString

java.lang.Object

weka.filters.Filter

weka.filters.unsupervised.attribute.NominalToString

All Implemented Interfaces:

Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, UnsupervisedFilter

public class NominalToString
extends Filter
implements UnsupervisedFilter, OptionHandler

Converts a nominal attribute (i.e. set number of values) to string (i.e. unspecified number of values).

Valid options are:

 -C <col>
  Sets the range of attributes to convert (default last).
 

Version:

$Revision: 10215 $

Author:

FracPete (fracpete at waikato dot ac dot nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NominalToString()

Method Summary

Methods

Modifier and Type	Method and Description
String	attributeIndexesTipText() Returns the tip text for this property
boolean	batchFinished() Signifies that this batch of input to the filter is finished.
String	getAttributeIndexes() Get the index of the attribute used.
Capabilities	getCapabilities() Returns the Capabilities of this filter.
String[]	getOptions() Gets the current settings of the filter.
String	getRevision() Returns the revision string.
String	globalInfo() Returns a string describing this filter
boolean	input(Instance instance) Input an instance for filtering.
Enumeration<Option>	listOptions() Returns an enumeration describing the available options.
static void	main(String[] args) Main method for testing this class.
void	setAttributeIndexes(String attIndex) Sets index of the attribute used.
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setOptions(String[] options) Parses a given list of options.

Methods inherited from class weka.filters.Filter

batchFilterFile, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, numPendingOutput, output, outputPeek, runFilter, toString, useFilter, wekaStaticWrapper

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NominalToString

public NominalToString()

Method Detail

globalInfo

public String globalInfo()

Returns a string describing this filter

Returns:

a description of the filter suitable for displaying in the explorer/experimenter gui

getCapabilities

public Capabilities getCapabilities()

Returns the Capabilities of this filter.

Specified by:

getCapabilities in interface CapabilitiesHandler

Overrides:

getCapabilities in class Filter

Returns:

the capabilities of this object

See Also:

Capabilities

setInputFormat

public boolean setInputFormat(Instances instanceInfo)
                       throws Exception

Sets the format of the input instances.

Overrides:

setInputFormat in class Filter

Parameters:

instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).

Returns:

true if the outputFormat may be collected immediately.

Throws:

UnsupportedAttributeTypeException - if the selected attribute a string attribute.

Exception - if the input format can't be set successfully.

input

public boolean input(Instance instance)

Input an instance for filtering. The instance is processed and made available for output immediately.

Overrides:

input in class Filter

Parameters:

instance - the input instance.

Returns:

true if the filtered instance may now be collected with output().

Throws:

IllegalStateException - if no input structure has been defined.

batchFinished

public boolean batchFinished()

Signifies that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.

Overrides:

batchFinished in class Filter

Returns:

true if there are instances pending output.

Throws:

IllegalStateException - if no input structure has been defined.

listOptions

public Enumeration<Option> listOptions()

Returns an enumeration describing the available options.

Specified by:

listOptions in interface OptionHandler

Returns:

an enumeration of all the available options.

setOptions

public void setOptions(String[] options)
                throws Exception

Parses a given list of options.

Valid options are:

 -C <col>
  Sets the range of attributes to convert (default last).
 

Specified by:

setOptions in interface OptionHandler

Parameters:

options - the list of options as an array of strings

Throws:

Exception - if an option is not supported

getOptions

public String[] getOptions()

Gets the current settings of the filter.

Specified by:

getOptions in interface OptionHandler

Returns:

an array of strings suitable for passing to setOptions

attributeIndexesTipText

public String attributeIndexesTipText()

Returns the tip text for this property

Returns:

tip text for this property suitable for displaying in the explorer/experimenter gui

getAttributeIndexes

public String getAttributeIndexes()

Get the index of the attribute used.

Returns:

the index of the attribute

setAttributeIndexes

public void setAttributeIndexes(String attIndex)

Sets index of the attribute used.

Parameters:

attIndex - the index of the attribute

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class Filter

Returns:

the revision

main

public static void main(String[] args)

Main method for testing this class.

Parameters:

args - should contain arguments to the filter: use -h for help