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## weka.filters.unsupervised.attribute
Class Add

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

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

    public class Add

extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler

An instance filter that adds a new attribute to the dataset. The new attribute contains all missing values.

Valid filter-specific options are:

-C index
Specify where to insert the column. First and last are valid indexes. (default last)

-L label1,label2,...
Create nominal attribute with the given labels (default numeric attribute)

-N name
Name of the new attribute. (default = 'Unnamed')

Version:
  $Revision: 5157 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`Add()`

Method Summary
`java.lang.String` | `attributeIndexTipText()` Returns the tip text for this property
`java.lang.String` | `attributeNameTipText()` Returns the tip text for this property
`java.lang.String` | `getAttributeIndex()` Get the index of the attribute used.
`java.lang.String` | `getAttributeName()` Get the name of the attribute to be created
`java.lang.String` | `getNominalLabels()` Get the list of labels for nominal attribute creation
`java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
`java.lang.String` | `globalInfo()` Returns a string describing this filter
`boolean` | `input(Instance instance)` Input an instance for filtering.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`java.lang.String` | `nominalLabelsTipText()` Returns the tip text for this property
`void` | `setAttributeIndex(java.lang.String attIndex)` Sets index of the attribute used.
`void` | `setAttributeName(java.lang.String name)` Set the new attribute's name
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setNominalLabels(java.lang.String labelList)` Set the labels for nominal attribute creation.
`void` | `setOptions(java.lang.String[] options)` Parses a list of options for this object.

Methods inherited from class weka.filters.Filter
`batchFilterFile, batchFinished, 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

### Add

    public Add()

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

### 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 list of options for this object. Valid options are:

  -C index
  Specify where to insert the column. First and last are valid indexes. (default last)

  -L label1,label2,...
  Create nominal attribute with the given labels (default numeric attribute)

  -N name
  Name of the new attribute. (default = 'Unnamed')

  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

### 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 format has been defined.

### attributeNameTipText

    public java.lang.String attributeNameTipText()

  Returns the tip text for this property

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

### getAttributeName

    public java.lang.String getAttributeName()

  Get the name of the attribute to be created

  Returns:
    the new attribute name

### setAttributeName

    public void setAttributeName(java.lang.String name)

  Set the new attribute's name

  Parameters:
    `name` - the new name

### attributeIndexTipText

    public java.lang.String attributeIndexTipText()

  Returns the tip text for this property

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

### getAttributeIndex

    public java.lang.String getAttributeIndex()

  Get the index of the attribute used.

  Returns:
    the index of the attribute

### setAttributeIndex

    public void setAttributeIndex(java.lang.String attIndex)

  Sets index of the attribute used.

  Parameters:
    `index` - the index of the attribute

### nominalLabelsTipText

    public java.lang.String nominalLabelsTipText()

  Returns the tip text for this property

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

### getNominalLabels

    public java.lang.String getNominalLabels()

  Get the list of labels for nominal attribute creation

  Returns:
    the list of labels for nominal attribute creation

### setNominalLabels

    public void setNominalLabels(java.lang.String labelList)

  Set the labels for nominal attribute creation.

  Parameters:
    `labelList` - a comma separated list of labels
  Throws:
    `java.lang.IllegalArgumentException` - if the labelList was invalid

### 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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