weka.filters.unsupervised.attribute

## Class RemoveType

- java.lang.Object
- - weka.filters.Filter
  - - weka.filters.unsupervised.attribute.RemoveType

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

      public class RemoveType
      extends Filter
      implements UnsupervisedFilter, StreamableFilter, OptionHandler

  Removes attributes of a given type.

  Valid options are:

       -T <nominal|numeric|string|date|relational>
        Attribute type to delete. Valid options are "nominal",
        "numeric", "string", "date" and "relational".
        (default "string")

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

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

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static Tag[]` | `TAGS_ATTRIBUTETYPE` Tag allowing selection of attribute type to delete

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `RemoveType()`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.String` | `attributeTypeTipText()` Returns the tip text for this property
    `boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
    `SelectedTag` | `getAttributeType()` Gets the attribute type to be deleted by the filter.
    `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
    `boolean` | `isOutputFormatDefined()` Returns whether the output format is ready to be collected
    `java.util.Enumeration<Option>` | `listOptions()` Returns an enumeration describing the available options.
    `static void` | `main(java.lang.String[] argv)` Main method for testing this class.
    `int` | `numPendingOutput()` Returns the number of instances pending output
    `Instance` | `output()` Output an instance after filtering and remove from the output queue.
    `Instance` | `outputPeek()` Output an instance after filtering but do not remove from the output queue.
    `void` | `setAttributeType(SelectedTag type)` Sets the attribute type to be deleted by the filter.
    `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, debugTipText, doNotCheckCapabilitiesTipText, filterFile, getCapabilities, getDebug, getDoNotCheckCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, makeCopies, makeCopy, mayRemoveInstanceAfterFirstBatchDone, postExecution, preExecution, run, runFilter, setDebug, setDoNotCheckCapabilities, toString, useFilter, wekaStaticWrapper`

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

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

- - ### Field Detail

    - #### TAGS_ATTRIBUTETYPE

          public static final Tag[] TAGS_ATTRIBUTETYPE

      Tag allowing selection of attribute type to delete

  - ### Constructor Detail

    - #### RemoveType

          public RemoveType()

  - ### Method Detail

    - #### 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 inputFormat can't be set successfully

    - #### input

          public boolean input(Instance instance)

      Input an instance for filtering.
      Overrides:
        `input` in class `Filter`
      Parameters:
        `instance` - the input instance
      Returns:
        true if the filtered instance may now be collected with output().

    - #### batchFinished

          public boolean batchFinished()
                                throws java.lang.Exception

      Signify that this batch of input to the filter is finished.
      Overrides:
        `batchFinished` in class `Filter`
      Returns:
        true if there are instances pending output
      Throws:
        `java.lang.Exception` - if something goes wrong

    - #### output

          public Instance output()

      Output an instance after filtering and remove from the output queue.
      Overrides:
        `output` in class `Filter`
      Returns:
        the instance that has most recently been filtered (or null if the queue is empty).

    - #### outputPeek

          public Instance outputPeek()

      Output an instance after filtering but do not remove from the output queue.
      Overrides:
        `outputPeek` in class `Filter`
      Returns:
        the instance that has most recently been filtered (or null if the queue is empty).

    - #### numPendingOutput

          public int numPendingOutput()

      Returns the number of instances pending output
      Overrides:
        `numPendingOutput` in class `Filter`
      Returns:
        the number of instances pending output

    - #### isOutputFormatDefined

          public boolean isOutputFormatDefined()

      Returns whether the output format is ready to be collected
      Overrides:
        `isOutputFormatDefined` in class `Filter`
      Returns:
        true if the output format is set

    - #### listOptions

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

      Returns 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:

           -T <nominal|numeric|string|date|relational>
            Attribute type to delete. Valid options are "nominal",
            "numeric", "string", "date" and "relational".
            (default "string")

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

      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

    - #### attributeTypeTipText

          public java.lang.String attributeTypeTipText()

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

    - #### setAttributeType

          public void setAttributeType(SelectedTag type)

      Sets the attribute type to be deleted by the filter.
      Parameters:
        `type` - a TAGS_ATTRIBUTETYPE of the new type the filter should delete

    - #### getAttributeType

          public SelectedTag getAttributeType()

      Gets the attribute type to be deleted by the filter.
      Returns:
        the attribute type as a selected tag TAGS_ATTRIBUTETYPE

    - #### 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

    - #### 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