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## weka.filters.unsupervised.attribute
Class Remove

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

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

    public class Remove

extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler

A filter that removes a range of attributes from the dataset. Will re-order the remaining attributes if invert matching sense is turned on and the attribute column indices are not specified in ascending order.

Valid options are:

     -R <index1,index2-index4,...>
      Specify list of columns to delete. First and last are valid
      indexes. (default none)

     -V
      Invert matching sense (i.e. only keep specified columns)

Version:
  $Revision: 7107 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`Remove()` Constructor so that we can initialize the Range variable properly.

Method Summary
`java.lang.String` | `attributeIndicesTipText()` Returns the tip text for this property
`java.lang.String` | `getAttributeIndices()` Get the current range selection.
`Capabilities` | `getCapabilities()` Returns the Capabilities of this filter.
`boolean` | `getInvertSelection()` Get whether the supplied columns are to be removed or kept
`java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
`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` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`void` | `setAttributeIndices(java.lang.String rangeList)` Set which attributes are to be deleted (or kept if invert is true)
`void` | `setAttributeIndicesArray(int[] attributes)` Set which attributes are to be deleted (or kept if invert is true)
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setInvertSelection(boolean invert)` Set whether selected columns should be removed or kept.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.

Methods inherited from class weka.filters.Filter
`batchFilterFile, batchFinished, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper`

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

Constructor Detail

### Remove

    public Remove()

  Constructor so that we can initialize the Range variable properly.

Method Detail

### listOptions

    public java.util.Enumeration listOptions()

  Returns 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 a given list of options.

  Valid options are:

       -R <index1,index2-index4,...>
        Specify list of columns to delete. First and last are valid
        indexes. (default none)

       -V
        Invert matching sense (i.e. only keep specified columns)

  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

### 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 if the outputFormat may be collected immediately
  Throws:
    `java.lang.Exception` - if the format couldn'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 structure has been defined.

### 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

### 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()

  Get whether the supplied columns are to be removed or kept

  Returns:
    true if the supplied columns will be kept

### setInvertSelection

    public void setInvertSelection(boolean invert)

  Set whether selected columns should be removed or kept. If true the selected columns are kept and unselected columns are deleted. If false selected columns are deleted and unselected columns are kept.

  Parameters:
    `invert` - the new invert setting

### attributeIndicesTipText

    public java.lang.String attributeIndicesTipText()

  Returns the tip text for this property

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

### getAttributeIndices

    public java.lang.String getAttributeIndices()

  Get the current range selection.

  Returns:
    a string containing a comma separated list of ranges

### setAttributeIndices

    public void setAttributeIndices(java.lang.String rangeList)

  Set which attributes are to be deleted (or kept if invert is true)

  Parameters:
    `rangeList` - a string representing the list of attributes. Since the string will typically come from a user, attributes are indexed from 1.
    eg: first-3,5,6-last

### setAttributeIndicesArray

    public void setAttributeIndicesArray(int[] attributes)

  Set which attributes are to be deleted (or kept if invert is true)

  Parameters:
    `attributes` - an array containing indexes of attributes to select. Since the array will typically come from a program, attributes are indexed from 0.

### 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

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