weka.filters.unsupervised.attribute
Class NominalToBinary

java.lang.Object
  weka.filters.Filter
      weka.filters.unsupervised.attribute.NominalToBinary

All Implemented Interfaces:

Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, UnsupervisedFilter

public class NominalToBinary
extends Filter
implements UnsupervisedFilter, OptionHandler

Converts all nominal attributes into binary numeric attributes. An attribute with k values is transformed into k binary attributes if the class is nominal (using the one-attribute-per-value approach). Binary attributes are left binary, if option '-A' is not given.If the class is numeric, you might want to use the supervised version of this filter.

Valid options are:

 -N
  Sets if binary attributes are to be coded as nominal ones.

 -A
  For each nominal value a new attribute is created, 
  not only if there are more than 2 values.

 -R <col1,col2-col4,...>
  Specifies list of columns to act on. First and last are 
  valid indexes.
  (default: first-last)

 -V
  Invert matching sense of column indexes.

Version:

$Revision: 8034 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

NominalToBinary()
Constructor - initialises the filter

Method Summary

String	attributeIndicesTipText() Returns the tip text for this property
String	binaryAttributesNominalTipText() Returns the tip text for this property
String	getAttributeIndices() Gets the current range selection
boolean	getBinaryAttributesNominal() Gets if binary attributes are to be treated as nominal ones.
Capabilities	getCapabilities() Returns the Capabilities of this filter.
boolean	getInvertSelection() Gets whether the supplied columns are to be removed or kept
String[]	getOptions() Gets the current settings of the filter.
String	getRevision() Returns the revision string.
boolean	getTransformAllValues() Gets if all nominal values are turned into new attributes, not only if there are more than 2.
String	globalInfo() Returns a string describing this filter
boolean	input(Instance instance) Input an instance for filtering.
String	invertSelectionTipText() Returns the tip text for this property
Enumeration	listOptions() Returns an enumeration describing the available options.
static void	main(String[] argv) Main method for testing this class.
void	setAttributeIndices(String rangeList) Sets which attributes are to be acted on.
void	setBinaryAttributesNominal(boolean bool) Sets if binary attributes are to be treates as nominal ones.
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setInvertSelection(boolean invert) Sets whether selected columns should be removed or kept.
void	setOptions(String[] options) Parses a given list of options.
void	setTransformAllValues(boolean bool) Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.
String	transformAllValuesTipText() Returns the tip text for this property

Methods inherited from class weka.filters.Filter

batchFilterFile, batchFinished, 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

NominalToBinary

public NominalToBinary()

Constructor - initialises the filter

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:

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

input

public boolean input(Instance instance)

Input an instance for filtering. Filter requires all training instances be read before producing output.

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 format has been set

listOptions

public Enumeration 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:

 -N
  Sets if binary attributes are to be coded as nominal ones.

 -A
  For each nominal value a new attribute is created, 
  not only if there are more than 2 values.

 -R <col1,col2-col4,...>
  Specifies list of columns to act on. First and last are 
  valid indexes.
  (default: first-last)

 -V
  Invert matching sense of column indexes.

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

binaryAttributesNominalTipText

public String binaryAttributesNominalTipText()

Returns the tip text for this property

Returns:

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

getBinaryAttributesNominal

public boolean getBinaryAttributesNominal()

Gets if binary attributes are to be treated as nominal ones.

Returns:

true if binary attributes are to be treated as nominal ones

setBinaryAttributesNominal

public void setBinaryAttributesNominal(boolean bool)

Sets if binary attributes are to be treates as nominal ones.

Parameters:

bool - true if binary attributes are to be treated as nominal ones

transformAllValuesTipText

public String transformAllValuesTipText()

Returns the tip text for this property

Returns:

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

getTransformAllValues

public boolean getTransformAllValues()

Gets if all nominal values are turned into new attributes, not only if there are more than 2.

Returns:

true all nominal values are transformed into new attributes

setTransformAllValues

public void setTransformAllValues(boolean bool)

Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.

Parameters:

bool - true if all nominal value are transformed into new attributes

invertSelectionTipText

public String invertSelectionTipText()

Returns the tip text for this property

Returns:

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

getInvertSelection

public boolean getInvertSelection()

Gets whether the supplied columns are to be removed or kept

Returns:

true if the supplied columns will be kept

setInvertSelection

public void setInvertSelection(boolean invert)

Sets whether selected columns should be removed or kept. If true the selected columns are kept and unselected columns are deleted. If false selected columns are deleted and unselected columns are kept.

Parameters:

invert - the new invert setting

attributeIndicesTipText

public String attributeIndicesTipText()

Returns the tip text for this property

Returns:

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

getAttributeIndices

public String getAttributeIndices()

Gets the current range selection

Returns:

a string containing a comma separated list of ranges

setAttributeIndices

public void setAttributeIndices(String rangeList)

Sets which attributes are to be acted on.

Parameters:

rangeList - a string representing the list of attributes. Since the string will typically come from a user, attributes are indexed from 1.
eg: first-3,5,6-last

Throws:

IllegalArgumentException - if an invalid range list is supplied

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[] argv)

Main method for testing this class.

Parameters:

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