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## weka.filters.unsupervised.attribute
Class Standardize

    java.lang.Object
      weka.filters.Filter
          weka.filters.unsupervised.attribute.PotentialClassIgnorer
              weka.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: 1.4.2.1 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`Standardize()`

Method Summary
`boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
`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, filterFile, inputFormat, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputPeek, useFilter`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

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)
                  throws java.lang.Exception

  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.Exception` - if an error occurs
    `java.lang.IllegalStateException` - if no input format has been set.

### batchFinished

    public boolean batchFinished()
                          throws java.lang.Exception

  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.Exception` - if an error occurs
    `java.lang.IllegalStateException` - if no input structure has been defined

### 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

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