weka.filters.unsupervised.attribute

Class Copy

java.lang.Object

weka.filters.Filter

weka.filters.unsupervised.attribute.Copy

All Implemented Interfaces:

Serializable, CapabilitiesHandler, OptionHandler, RevisionHandler, StreamableFilter, UnsupervisedFilter

public class Copy
extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler

An instance filter that copies a range of attributes in the dataset. This is used in conjunction with other filters that overwrite attribute values during the course of their operation -- this filter allows the original attributes to be kept as well as the new attributes.

Valid options are:

 -R <index1,index2-index4,...>
  Specify list of columns to copy. First and last are valid
  indexes. (default none)

 -V
  Invert matching sense (i.e. copy all non-specified columns)

Version:

$Revision: 8034 $

Author:

Len Trigg (trigg@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Copy()

Method Summary

Methods

Modifier and Type	Method and Description
String	attributeIndicesTipText() Returns the tip text for this property
String	getAttributeIndices() Get the current range selection
Capabilities	getCapabilities() Returns the Capabilities of this filter.
boolean	getInvertSelection() Get 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.
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) Set which attributes are to be copied (or kept if invert is true)
void	setAttributeIndicesArray(int[] attributes) Set which attributes are to be copied (or kept if invert is true)
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setInvertSelection(boolean invert) Set whether selected columns should be removed or kept.
void	setOptions(String[] options) Parses a given list of options.

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

Copy

public Copy()

Method Detail

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:

 -R <index1,index2-index4,...>
  Specify list of columns to copy. First and last are valid
  indexes. (default none)

 -V
  Invert matching sense (i.e. copy all non-specified columns)

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

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 a problem occurs setting the input format

input

public boolean input(Instance instance)

Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all 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 defined.

globalInfo

public String globalInfo()

Returns a string describing this filter

Returns:

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

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()

Get 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)

Set whether selected columns should be removed or kept. If true the selected columns are kept and unselected columns are copied. If false selected columns are copied and unselected columns are kept.
Note: use this method before you call setInputFormat(Instances), since the output format is determined in that method.

Parameters:

invert - the new invert setting

getAttributeIndices

public String getAttributeIndices()

Get the current range selection

Returns:

a string containing a comma separated list of ranges

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

setAttributeIndices

public void setAttributeIndices(String rangeList)
                         throws Exception

Set which attributes are to be copied (or kept if invert is true)

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
Note: use this method before you call setInputFormat(Instances), since the output format is determined in that method.

Throws:

Exception - if an invalid range list is supplied

setAttributeIndicesArray

public void setAttributeIndicesArray(int[] attributes)
                              throws Exception

Set which attributes are to be copied (or kept if invert is true)

Parameters:

attributes - an array containing indexes of attributes to select. Since the array will typically come from a program, attributes are indexed from 0.
Note: use this method before you call setInputFormat(Instances), since the output format is determined in that method.

Throws:

Exception - if an invalid set of ranges 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