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## weka.filters.unsupervised.instance
Class RemovePercentage

    java.lang.Object
      weka.filters.Filter
          weka.filters.unsupervised.instance.RemovePercentage

All Implemented Interfaces:
  java.io.Serializable, OptionHandler, UnsupervisedFilter

    public class RemovePercentage

extends Filter
implements UnsupervisedFilter, OptionHandler

This filter removes a given percentage of a dataset. Valid options are:

-V
Specifies if inverse of selection is to be output.

-P percentage
The percentage of instances to select. (default 50)

Version:
  $Revision: 1.3.2.1 $
Author:
  Richard Kirkby (eibe@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`RemovePercentage()`

Method Summary
`boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
`boolean` | `getInvertSelection()` Gets if selection is to be inverted.
`java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
`int` | `getPercentage()` Gets the percentage of instances to select.
`java.lang.String` | `globalInfo()` Returns a string describing this filter
`boolean` | `input(Instance instance)` Input an instance for filtering.
`java.lang.String` | `invertSelectionTipText()` Returns the tip text for this property
`java.util.Enumeration` | `listOptions()` Gets an enumeration describing the available options..
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`java.lang.String` | `percentageTipText()` Returns the tip text for this property
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setInvertSelection(boolean inverse)` Sets if selection is to be inverted.
`void` | `setOptions(java.lang.String[] options)` Parses the options for this object.
`void` | `setPercentage(int percent)` Sets the percentage of intances to select.

Methods inherited from class weka.filters.Filter
`batchFilterFile, filterFile, getOutputFormat, 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

### RemovePercentage

    public RemovePercentage()

Method Detail

### listOptions

    public java.util.Enumeration listOptions()

  Gets 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:

  -P percentage
  The percentage of instances to select. (default 50)

  -V
  Specifies if inverse of selection is to be output.

  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

### 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

### percentageTipText

    public java.lang.String percentageTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getPercentage

    public int getPercentage()

  Gets the percentage of instances to select.

  Returns:
    the percentage.

### setPercentage

    public void setPercentage(int percent)

  Sets the percentage of intances to select.

  Parameters:
    `percent` - the percentage
  Throws:
    `java.lang.IllegalArgumentException` - if percenatge out of range

### invertSelectionTipText

    public java.lang.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()

  Gets if selection is to be inverted.

  Returns:
    true if the selection is to be inverted

### setInvertSelection

    public void setInvertSelection(boolean inverse)

  Sets if selection is to be inverted.

  Parameters:
    `inverse` - true if inversion is to be performed

### 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 because outputFormat can 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. 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:
    `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. 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

### 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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