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## weka.filters.unsupervised.attribute
Class StringToNominal

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

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

    public class StringToNominal

extends Filter
implements UnsupervisedFilter, OptionHandler

Converts a string attribute (i.e. unspecified number of values) to nominal (i.e. set number of values). You should ensure that all string values that will appear are represented in the dataset.

Valid filter-specific options are:

-C col
Index of the attribute to be changed. (default last)

Version:
  $Revision: 1.4 $
Author:
  Len Trigg (len@reeltwo.com)
See Also:
  Serialized Form

Constructor Summary
`StringToNominal()`

Method Summary
`java.lang.String` | `attributeIndexTipText()`
`boolean` | `batchFinished()` Signifies that this batch of input to the filter is finished.
`java.lang.String` | `getAttributeIndex()` Get the index of the attribute used.
`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.
`void` | `setAttributeIndex(java.lang.String attIndex)` Sets index of the attribute used.
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setOptions(java.lang.String[] options)` Parses the options for this object.

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

### StringToNominal

    public StringToNominal()

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:
    `UnsupportedAttributeTypeException` - if the selected attribute a string attribute.
    `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 structure has been defined.

### batchFinished

    public boolean batchFinished()

  Signifies that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.

  Overrides:
    `batchFinished` in class `Filter`
  Returns:
    true if there are instances pending output.
  Throws:
    `java.lang.IllegalStateException` - if no input structure has been defined.

### 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)

  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

### 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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