weka.filters.unsupervised.attribute

Class StringToNominal

java.lang.Object

weka.filters.Filter

weka.filters.unsupervised.attribute.StringToNominal

All Implemented Interfaces:

java.io.Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, UnsupervisedFilter

public class StringToNominal
extends Filter
implements UnsupervisedFilter, OptionHandler

Converts a string attribute (i.e. unspecified number of values) to nominal (i.e. set number of values). You should ensure that all string values that will appear are represented in the first batch of the data.

Valid options are:

 -R <col>
  Sets the range of attribute indices (default last).
 

Version:

$Revision: 9273 $

Author:

Len Trigg (len@reeltwo.com)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StringToNominal()

Method Summary

Modifier and Type	Method and Description
java.lang.String	attributeRangeTipText()
boolean	batchFinished() Signifies that this batch of input to the filter is finished.
java.lang.String	getAttributeRange() Get the range of indices of the attributes used.
Capabilities	getCapabilities() Returns the Capabilities of this filter.
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
boolean	input(Instance instance) Input an instance for filtering.
java.util.Enumeration<Option>	listOptions() Returns an enumeration describing the available options.
static void	main(java.lang.String[] argv) Main method for testing this class.
void	setAttributeRange(java.lang.String rangeList) Sets range of indices of the attributes used.
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setOptions(java.lang.String[] options) Parses a given list of options.

Methods inherited from class weka.filters.Filter

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

Methods inherited from class java.lang.Object

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

Constructor Detail

StringToNominal

public StringToNominal()

Method Detail

globalInfo

public java.lang.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 java.lang.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.

java.lang.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:

java.lang.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:

java.lang.IllegalStateException - if no input structure has been defined.

listOptions

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

Parses a given list of options.

Valid options are:

 -R <col>
  Sets the range of attribute indices (default last).
 

 -V <col>
  Inverts the selection specified by -R.
 

Specified by:

setOptions in interface OptionHandler

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

Returns:

an array of strings suitable for passing to setOptions

attributeRangeTipText

public java.lang.String attributeRangeTipText()

Returns:

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

getAttributeRange

public java.lang.String getAttributeRange()

Get the range of indices of the attributes used.

Returns:

the index of the attribute

setAttributeRange

public void setAttributeRange(java.lang.String rangeList)

Sets range of indices of the attributes used.

Parameters:

attIndex - the index of the attribute

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[] argv)

Main method for testing this class.

Parameters:

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