weka.filters
Class NumericTransformFilter

java.lang.Object
  |
  +--weka.filters.Filter
        |
        +--weka.filters.NumericTransformFilter

All Implemented Interfaces:

OptionHandler, java.io.Serializable

public class NumericTransformFilter

extends Filter

implements OptionHandler

Transforms numeric attributes using a given transformation method.

Valid filter-specific options are:

-R index1,index2-index4,...
Specify list of columns to transform. First and last are valid indexes. (default none). Non-numeric columns are skipped.

-V
Invert matching sense.

-C string
Name of the class containing the method used for transformation. (default java.lang.Math)

-M string
Name of the method used for the transformation. (default abs)

Author:

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

See Also:

Serialized Form

Fields inherited from class weka.filters.Filter

m_NewBatch

Constructor Summary

NumericTransformFilter()
Default constructor -- sets the default transform method to java.lang.Math.abs().

Method Summary

java.lang.String	attributeIndicesTipText() Returns the tip text for this property
java.lang.String	getAttributeIndices() Get the current range selection
java.lang.String	getClassName() Get the class containing the transformation method.
boolean	getInvertSelection() Get whether the supplied columns are to be transformed or not
java.lang.String	getMethodName() Get the transformation method.
java.lang.String[]	getOptions() Gets the current settings of the filter.
boolean	input(Instance instance) Input an instance for filtering.
java.util.Enumeration	listOptions() Returns an enumeration describing the available options
static void	main(java.lang.String[] argv) Main method for testing this class.
void	setAttributeIndices(java.lang.String rangeList) Set which attributes are to be transformed (or kept if invert is true).
void	setAttributeIndicesArray(int[] attributes) Set which attributes are to be transformed (or kept if invert is true)
void	setClassName(java.lang.String name) Sets the class containing the transformation method.
boolean	setInputFormat(Instances instanceInfo) Sets the format of the input instances.
void	setInvertSelection(boolean invert) Set whether selected columns should be transformed or not.
void	setMethodName(java.lang.String name) Set the transformation method.
void	setOptions(java.lang.String[] options) Parses the options for this object.

Methods inherited from class weka.filters.Filter

batchFilterFile, batchFinished, bufferInput, copyStringValues, copyStringValues, filterFile, flushInput, getInputFormat, getInputStringIndex, getOutputFormat, getOutputStringIndex, getStringIndices, inputFormat, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputFormatPeek, outputPeek, push, resetQueue, setOutputFormat, useFilter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NumericTransformFilter

public NumericTransformFilter()

Default constructor -- sets the default transform method to java.lang.Math.abs().

Method Detail

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:

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

input

public boolean input(Instance instance)
              throws java.lang.Exception

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 format has been set.

java.lang.reflect.InvocationTargetException - if there is a problem applying the configured transform method.

listOptions

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

Parses the options for this object. Valid options are:

-R index1,index2-index4,...
Specify list of columns to transform. First and last are valid indexes. (default none). Non-numeric columns are skipped.

-V
Invert matching sense.

-C string
Name of the class containing the method used for transformation. (default java.lang.Math)

-M string
Name of the method used for the transformation. (default abs)

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

getClassName

public java.lang.String getClassName()

Get the class containing the transformation method.

Returns:

string describing the class

setClassName

public void setClassName(java.lang.String name)
                  throws java.lang.ClassNotFoundException

Sets the class containing the transformation method.

Parameters:

name - the name of the class

Throws:

java.lang.ClassNotFoundException - if class can't be found

getMethodName

public java.lang.String getMethodName()

Get the transformation method.

Returns:

string describing the transformation method.

setMethodName

public void setMethodName(java.lang.String name)
                   throws java.lang.NoSuchMethodException

Set the transformation method.

Parameters:

name - the name of the method

Throws:

java.lang.NoSuchMethodException - if method can't be found in class

getInvertSelection

public boolean getInvertSelection()

Get whether the supplied columns are to be transformed or not

Returns:

true if the supplied columns will be kept

setInvertSelection

public void setInvertSelection(boolean invert)

Set whether selected columns should be transformed or not.

Parameters:

invert - 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()

Get the current range selection

Returns:

a string containing a comma separated list of ranges

setAttributeIndices

public void setAttributeIndices(java.lang.String rangeList)

Set which attributes are to be transformed (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

Throws:

InvalidArgumentException - if an invalid range list is supplied

setAttributeIndicesArray

public void setAttributeIndicesArray(int[] attributes)

Set which attributes are to be transformed (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.

Throws:

InvalidArgumentException - if an invalid set of ranges is supplied

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