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## weka.filters.unsupervised.attribute
Class PotentialClassIgnorer

    java.lang.Object
      weka.filters.Filter
          weka.filters.unsupervised.attribute.PotentialClassIgnorer

All Implemented Interfaces:
  java.io.Serializable

Direct Known Subclasses:
  Discretize, Normalize, NumericToBinary, ReplaceMissingValues, Standardize

    public abstract class PotentialClassIgnorer

extends Filter

This filter should be extended by other unsupervised attribute filters to allow processing of the class attribute if that's required. It the class is to be ignored it is essential that the extending filter does not change the position (i.e. index) of the attribute that is originally the class attribute !

Version:
  $Revision: 1.2 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz), Mark Hall (mhall@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`PotentialClassIgnorer()`

Method Summary
`Instances` | `getOutputFormat()` Gets the format of the output instances.
`void` | `setIgnoreClass(boolean newIgnoreClass)` Set the IgnoreClass value.
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.

Methods inherited from class weka.filters.Filter
`batchFilterFile, batchFinished, filterFile, input, inputFormat, isOutputFormatDefined, main, numPendingOutput, output, outputFormat, outputPeek, useFilter`

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

Constructor Detail

### PotentialClassIgnorer

    public PotentialClassIgnorer()

Method Detail

### setInputFormat

    public boolean setInputFormat(Instances instanceInfo)
                           throws java.lang.Exception

  Sets the format of the input instances. If the filter is able to determine the output format before seeing any input instances, it does so here. This default implementation clears the output format and output queue, and the new batch flag is set. Overriders should call `super.setInputFormat(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 inputFormat can't be set successfully

### getOutputFormat

    public final Instances getOutputFormat()

  Gets the format of the output instances. This should only be called after input() or batchFinished() has returned true. The relation name of the output instances should be changed to reflect the action of the filter (eg: add the filter name and options).

  Overrides:
    `getOutputFormat` in class `Filter`
  Returns:
    an Instances object containing the output instance structure only.
  Throws:
    `java.lang.NullPointerException` - if no input structure has been defined (or the output format hasn't been determined yet)

### setIgnoreClass

    public void setIgnoreClass(boolean newIgnoreClass)

  Set the IgnoreClass value. Set this to true if the class index is to be unset before the filter is applied.

  Parameters:
    `newIgnoreClass` - The new IgnoreClass value.

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