weka.filters.unsupervised.instance

## Class RemovePercentage

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

- All Implemented Interfaces:
    java.io.Serializable, CapabilitiesHandler, CapabilitiesIgnorer, OptionHandler, RevisionHandler, UnsupervisedFilter

      public class RemovePercentage
      extends Filter
      implements UnsupervisedFilter, OptionHandler

  A filter that removes a given percentage of a dataset.

  Valid options are:

       -P <percentage>
        Specifies percentage of instances to select. (default 50)

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

  Version:
    $Revision: 10215 $
  Author:
    Richard Kirkby (eibe@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz)
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `RemovePercentage()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
    `Capabilities` | `getCapabilities()` Returns the Capabilities of this filter.
    `boolean` | `getInvertSelection()` Gets if selection is to be inverted.
    `java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
    `double` | `getPercentage()` Gets the percentage of instances to select.
    `java.lang.String` | `getRevision()` Returns the revision string.
    `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<Option>` | `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 a given list of options.
    `void` | `setPercentage(double percent)` Sets the percentage of intances to select.

    - ### Methods inherited from class weka.filters.Filter

      `batchFilterFile, debugTipText, doNotCheckCapabilitiesTipText, filterFile, getCapabilities, getDebug, getDoNotCheckCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, numPendingOutput, output, outputPeek, runFilter, setDebug, setDoNotCheckCapabilities, toString, useFilter, wekaStaticWrapper`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### RemovePercentage

          public RemovePercentage()

  - ### Method Detail

    - #### listOptions

          public java.util.Enumeration<Option> listOptions()

      Gets an enumeration describing the available options..
      Specified by:
        `listOptions` in interface `OptionHandler`
      Overrides:
        `listOptions` in class `Filter`
      Returns:
        an enumeration of all the available options.

    - #### setOptions

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

      Parses a given list of options.

      Valid options are:

           -P <percentage>
            Specifies percentage of instances to select. (default 50)

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

      Specified by:
        `setOptions` in interface `OptionHandler`
      Overrides:
        `setOptions` in class `Filter`
      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`
      Overrides:
        `getOptions` in class `Filter`
      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 double getPercentage()

      Gets the percentage of instances to select.
      Returns:
        the percentage.

    - #### setPercentage

          public void setPercentage(double percent)

      Sets the percentage of intances to select.
      Parameters:
        `percent` - the percentage
      Throws:
        `java.lang.IllegalArgumentException` - if percentage 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

    - #### getCapabilities

          public Capabilities getCapabilities()

      Returns the Capabilities of this filter.
      Specified by:
        `getCapabilities` in interface `CapabilitiesHandler`
      Overrides:
        `getCapabilities` in class `Filter`
      Returns:
        the capabilities of this object
      See Also:
        `Capabilities`

    - #### 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

    - #### getRevision

          public java.lang.String getRevision()

      Returns the revision string.
      Specified by:
        `getRevision` in interface `RevisionHandler`
      Overrides:
        `getRevision` in class `Filter`
      Returns:
        the revision

    - #### 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