weka.filters.unsupervised.attribute
Class Standardize

java.lang.Object
  extended byweka.filters.Filter
      extended byweka.filters.unsupervised.attribute.PotentialClassIgnorer
          extended byweka.filters.unsupervised.attribute.Standardize
All Implemented Interfaces:
java.io.Serializable, UnsupervisedFilter

public class Standardize
extends PotentialClassIgnorer
implements UnsupervisedFilter

Standardizes all numeric attributes in the given dataset to have zero mean and unit variance. intervals.

Version:
$Revision: 1.4 $
Author:
Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
Serialized Form

Field Summary
private  double[] m_Means
          The means
private  double[] m_StdDevs
          The variances
 
Fields inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer
m_ClassIndex, m_IgnoreClass
 
Fields inherited from class weka.filters.Filter
m_NewBatch
 
Constructor Summary
Standardize()
           
 
Method Summary
 boolean batchFinished()
          Signify that this batch of input to the filter is finished.
private  void convertInstance(Instance instance)
          Convert a single instance over.
 java.lang.String globalInfo()
          Returns a string describing this filter
 boolean input(Instance instance)
          Input an instance for filtering.
static void main(java.lang.String[] argv)
          Main method for testing this class.
 boolean setInputFormat(Instances instanceInfo)
          Sets the format of the input instances.
 
Methods inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer
getOutputFormat, setIgnoreClass
 
Methods inherited from class weka.filters.Filter
batchFilterFile, bufferInput, copyStringValues, copyStringValues, filterFile, flushInput, getInputFormat, getInputStringIndex, getOutputStringIndex, getStringIndices, inputFormat, inputFormatPeek, 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
 

Field Detail

m_Means

private double[] m_Means
The means


m_StdDevs

private double[] m_StdDevs
The variances

Constructor Detail

Standardize

public Standardize()
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

setInputFormat

public boolean setInputFormat(Instances instanceInfo)
                       throws java.lang.Exception
Sets the format of the input instances.

Overrides:
setInputFormat in class PotentialClassIgnorer
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)
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:
java.lang.IllegalStateException - if no input format has been set.

batchFinished

public boolean batchFinished()
Signify 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

convertInstance

private void convertInstance(Instance instance)
Convert a single instance over. The converted instance is added to the end of the output queue.

Parameters:
instance - the instance to convert

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