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## weka.filters.unsupervised.attribute
Class NominalToBinary

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

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

    public class NominalToBinary

extends Filter
implements UnsupervisedFilter, OptionHandler

Converts all nominal attributes into binary numeric attributes. An attribute with k values is transformed into k binary attributes if the class is nominal (using the one-attribute-per-value approach). Binary attributes are left binary, if option '-A' is not given.If the class is numeric, you might want to use the supervised version of this filter.

Valid options are:

     -N
      Sets if binary attributes are to be coded as nominal ones.

     -A
      For each nominal value a new attribute is created,
      not only if there are more than 2 values.

     -R <col1,col2-col4,...>
      Specifies list of columns to act on. First and last are
      valid indexes.
      (default: first-last)

     -V
      Invert matching sense of column indexes.

Version:
  $Revision: 5543 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`NominalToBinary()` Constructor - initialises the filter

Method Summary
`java.lang.String` | `attributeIndicesTipText()` Returns the tip text for this property
`java.lang.String` | `binaryAttributesNominalTipText()` Returns the tip text for this property
`java.lang.String` | `getAttributeIndices()` Gets the current range selection
`boolean` | `getBinaryAttributesNominal()` Gets if binary attributes are to be treated as nominal ones.
`Capabilities` | `getCapabilities()` Returns the Capabilities of this filter.
`boolean` | `getInvertSelection()` Gets 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.
`boolean` | `getTransformAllValues()` Gets if all nominal values are turned into new attributes, not only if there are more than 2.
`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)` Sets which attributes are to be acted on.
`void` | `setBinaryAttributesNominal(boolean bool)` Sets if binary attributes are to be treates as nominal ones.
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setInvertSelection(boolean invert)` Sets whether selected columns should be removed or kept.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setTransformAllValues(boolean bool)` Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.
`java.lang.String` | `transformAllValuesTipText()` Returns the tip text for this property

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

### NominalToBinary

    public NominalToBinary()

  Constructor - initialises the filter

Method Detail

### 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

### 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 input format can't be set successfully

### input

    public boolean input(Instance instance)

  Input an instance for filtering. Filter requires all training 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

### 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:

       -N
        Sets if binary attributes are to be coded as nominal ones.

       -A
        For each nominal value a new attribute is created,
        not only if there are more than 2 values.

       -R <col1,col2-col4,...>
        Specifies list of columns to act on. First and last are
        valid indexes.
        (default: first-last)

       -V
        Invert matching sense of column indexes.

  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

### binaryAttributesNominalTipText

    public java.lang.String binaryAttributesNominalTipText()

  Returns the tip text for this property

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

### getBinaryAttributesNominal

    public boolean getBinaryAttributesNominal()

  Gets if binary attributes are to be treated as nominal ones.

  Returns:
    true if binary attributes are to be treated as nominal ones

### setBinaryAttributesNominal

    public void setBinaryAttributesNominal(boolean bool)

  Sets if binary attributes are to be treates as nominal ones.

  Parameters:
    `bool` - true if binary attributes are to be treated as nominal ones

### transformAllValuesTipText

    public java.lang.String transformAllValuesTipText()

  Returns the tip text for this property

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

### getTransformAllValues

    public boolean getTransformAllValues()

  Gets if all nominal values are turned into new attributes, not only if there are more than 2.

  Returns:
    true all nominal values are transformed into new attributes

### setTransformAllValues

    public void setTransformAllValues(boolean bool)

  Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.

  Parameters:
    `bool` - true if all nominal value are transformed into new attributes

### 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 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)

  Sets 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()

  Gets the current range selection

  Returns:
    a string containing a comma separated list of ranges

### setAttributeIndices

    public void setAttributeIndices(java.lang.String rangeList)

  Sets which attributes are to be acted on.

  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
  Throws:
    `java.lang.IllegalArgumentException` - if an invalid range list is supplied

### 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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