weka.filters.unsupervised.attribute

Class NumericToNominal

java.lang.Object

weka.filters.Filter

weka.filters.SimpleFilter

weka.filters.SimpleBatchFilter

weka.filters.unsupervised.attribute.NumericToNominal

All Implemented Interfaces:

java.io.Serializable, CapabilitiesHandler, CapabilitiesIgnorer, CommandlineRunnable, OptionHandler, RevisionHandler, WeightedAttributesHandler, WeightedInstancesHandler

public class NumericToNominal
extends SimpleBatchFilter
implements WeightedInstancesHandler, WeightedAttributesHandler

A filter for turning numeric attributes into nominal ones. Unlike discretization, it just takes all numeric values and adds them to the list of nominal values of that attribute. Useful after CSV imports, to force certain attributes to become nominal, e.g., the class attribute, containing values from 1 to 5.

Valid options are:

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

 -V
  Invert matching sense of column indexes.
 

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NumericToNominal()

Method Summary

Modifier and Type	Method and Description
java.lang.String	attributeIndicesTipText() Returns the tip text for this property
java.lang.String	getAttributeIndices() Gets the current range selection
Capabilities	getCapabilities() Returns the Capabilities of this filter.
boolean	getInvertSelection() Gets whether the supplied columns are to be worked on or the others.
java.lang.String[]	getOptions() Gets the current settings of the filter.
java.lang.String	getRevision() Returns the revision string.
java.lang.String	globalInfo() Returns a string describing this filter
java.lang.String	invertSelectionTipText() Returns the tip text for this property
java.util.Enumeration<Option>	listOptions() Gets an enumeration describing the available options.
static void	main(java.lang.String[] args) Runs the filter with the given parameters.
void	setAttributeIndices(java.lang.String value) Sets which attributes are to be "nominalized" (only numeric attributes among the selection will be transformed).
void	setAttributeIndicesArray(int[] value) Sets which attributes are to be transoformed to nominal.
void	setInvertSelection(boolean value) Sets whether selected columns should be worked on or all the others apart from these.
void	setOptions(java.lang.String[] options) Parses a given list of options.

Methods inherited from class weka.filters.SimpleBatchFilter

allowAccessToFullInputFormat, batchFinished, input, input

Methods inherited from class weka.filters.SimpleFilter

setInputFormat

Methods inherited from class weka.filters.Filter

batchFilterFile, debugTipText, doNotCheckCapabilitiesTipText, filterFile, getCapabilities, getCopyOfInputFormat, getDebug, getDoNotCheckCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, numPendingOutput, output, outputPeek, postExecution, preExecution, run, runFilter, setDebug, setDoNotCheckCapabilities, toString, useFilter, wekaStaticWrapper

Methods inherited from class java.lang.Object

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

Constructor Detail

NumericToNominal

public NumericToNominal()

Method Detail

globalInfo

public java.lang.String globalInfo()

Returns a string describing this filter

Specified by:

globalInfo in class SimpleFilter

Returns:

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

listOptions

public java.util.Enumeration<Option> listOptions()

Gets an enumeration describing the available options.

Specified by:

listOptions in interface OptionHandler

Overrides:

listOptions in class Filter

Returns:

an enumeration of all the available options.

setOptions

public void setOptions(java.lang.String[] options)
                throws java.lang.Exception

Parses a given list of options.

Valid options are:

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

 -V
  Invert matching sense of column indexes.
 

Specified by:

setOptions in interface OptionHandler

Overrides:

setOptions in class Filter

Parameters:

options - the list of options as an array of strings

Throws:

java.lang.Exception - if an option is not supported

getOptions

public java.lang.String[] getOptions()

Gets the current settings of the filter.

Specified by:

getOptions in interface OptionHandler

Overrides:

getOptions in class Filter

Returns:

an array of strings suitable for passing to setOptions

invertSelectionTipText

public java.lang.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 worked on or the others.

Returns:

true if the supplied columns will be worked on

setInvertSelection

public void setInvertSelection(boolean value)

Sets whether selected columns should be worked on or all the others apart from these. If true all the other columns are considered for "nominalization".

Parameters:

value - the new invert setting

attributeIndicesTipText

public java.lang.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 java.lang.String getAttributeIndices()

Gets the current range selection

Returns:

a string containing a comma separated list of ranges

setAttributeIndices

public void setAttributeIndices(java.lang.String value)

Sets which attributes are to be "nominalized" (only numeric attributes among the selection will be transformed).

Parameters:

value - 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:

java.lang.IllegalArgumentException - if an invalid range list is supplied

setAttributeIndicesArray

public void setAttributeIndicesArray(int[] value)

Sets which attributes are to be transoformed to nominal. (only numeric attributes among the selection will be transformed).

Parameters:

value - an array containing indexes of attributes to nominalize. Since the array will typically come from a program, attributes are indexed from 0.

Throws:

java.lang.IllegalArgumentException - if an invalid set of ranges is supplied

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

getRevision

public java.lang.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(java.lang.String[] args)

Runs the filter with the given parameters. Use -h to list options.

Parameters:

args - the commandline options