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## weka.filters.unsupervised.attribute
Class MergeTwoValues

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

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

    public class MergeTwoValues

extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler

Merges two values of a nominal attribute.

Valid filter-specific options are:

-C col
The column containing the values to be merged. (default last)

-F index
Index of the first value (default first).

-S index
Index of the second value (default last).

Version:
  $Revision: 1.4 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`MergeTwoValues()`

Method Summary
`java.lang.String` | `attributeIndexTipText()`
`java.lang.String` | `firstValueTipText()`
`java.lang.String` | `getAttributeIndex()` Get the index of the attribute used.
`java.lang.String` | `getFirstValueIndex()` Get the index of the first value used.
`java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
`java.lang.String` | `getSecondValueIndex()` Get the index of the second value used.
`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` | `secondValueTipText()`
`void` | `setAttributeIndex(java.lang.String attIndex)` Sets index of the attribute used.
`void` | `setFirstValueIndex(java.lang.String firstIndex)` Sets index of the first value used.
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setOptions(java.lang.String[] options)` Parses the options for this object.
`void` | `setSecondValueIndex(java.lang.String secondIndex)` Sets index of the second value used.

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

### MergeTwoValues

    public MergeTwoValues()

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

### 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. The instance is processed and made available for output immediately.

  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 the options for this object. Valid options are:

  -C col
  The column containing the values to be merged. (default last)

  -F index
  Index of the first value (default first).

  -S index
  Index of the second value (default last).

  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

### attributeIndexTipText

    public java.lang.String attributeIndexTipText()

  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

### firstValueTipText

    public java.lang.String firstValueTipText()

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

### getFirstValueIndex

    public java.lang.String getFirstValueIndex()

  Get the index of the first value used.

  Returns:
    the index of the first value

### setFirstValueIndex

    public void setFirstValueIndex(java.lang.String firstIndex)

  Sets index of the first value used.

  Parameters:
    `index` - the index of the first value

### secondValueTipText

    public java.lang.String secondValueTipText()

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

### getSecondValueIndex

    public java.lang.String getSecondValueIndex()

  Get the index of the second value used.

  Returns:
    the index of the second value

### setSecondValueIndex

    public void setSecondValueIndex(java.lang.String secondIndex)

  Sets index of the second value used.

  Parameters:
    `index` - the index of the second value

### 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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