Normalize

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## weka.filters.unsupervised.attribute
Class Normalize

    java.lang.Object
      weka.filters.Filter
          weka.filters.unsupervised.attribute.PotentialClassIgnorer
              weka.filters.unsupervised.attribute.Normalize

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

    public class Normalize

extends PotentialClassIgnorer
implements UnsupervisedFilter, Sourcable, OptionHandler

Normalizes all numeric values in the given dataset (apart from the class attribute, if set). The resulting values are by default in [0,1] for the data used to compute the normalization intervals. But with the scale and translation parameters one can change that, e.g., with scale = 2.0 and translation = -1.0 you get values in the range [-1,+1].

Valid options are:

     -unset-class-temporarily
      Unsets the class index temporarily before the filter is
      applied to the data.
      (default: no)

     -S <num>
      The scaling factor for the output range.
      (default: 1.0)

     -T <num>
      The translation of the output range.
      (default: 0.0)

Version:
  $Revision: 1.13 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)
See Also:
  Serialized Form

Constructor Summary
`Normalize()`

Method Summary
`boolean` | `batchFinished()` Signify that this batch of input to the filter is finished.
`Capabilities` | `getCapabilities()` Returns the Capabilities of this filter.
`double[]` | `getMaxArray()` Returns the calculated maximum values for the attributes in the data.
`double[]` | `getMinArray()` Returns the calculated minimum values for the attributes in the data.
`java.lang.String[]` | `getOptions()` Gets the current settings of the filter.
`java.lang.String` | `getRevision()` Returns the revision string.
`double` | `getScale()` Get the scaling factor.
`double` | `getTranslation()` Get the translation.
`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[] args)` Main method for running this filter.
`java.lang.String` | `scaleTipText()` Returns the tip text for this property.
`boolean` | `setInputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setScale(double value)` Sets the scaling factor.
`void` | `setTranslation(double value)` Sets the translation.
`java.lang.String` | `toSource(java.lang.String className, Instances data)` Returns a string that describes the filter as source.
`java.lang.String` | `translationTipText()` Returns the tip text for this property.

Methods inherited from class weka.filters.unsupervised.attribute.PotentialClassIgnorer
`getIgnoreClass, getOutputFormat, ignoreClassTipText, setIgnoreClass`

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

### Normalize

    public Normalize()

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`
  Overrides:
    `listOptions` in class `PotentialClassIgnorer`
  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:

       -unset-class-temporarily
        Unsets the class index temporarily before the filter is
        applied to the data.
        (default: no)

       -S <num>
        The scaling factor for the output range.
        (default: 1.0)

       -T <num>
        The translation of the output range.
        (default: 0.0)

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `PotentialClassIgnorer`
  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 `PotentialClassIgnorer`
  Returns:
    an array of strings suitable for passing to setOptions

### 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 `PotentialClassIgnorer`
  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)
                  throws java.lang.Exception

  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.Exception` - if an error occurs
    `java.lang.IllegalStateException` - if no input format has been set.

### batchFinished

    public boolean batchFinished()
                          throws java.lang.Exception

  Signify 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.Exception` - if an error occurs
    `java.lang.IllegalStateException` - if no input structure has been defined

### toSource

    public java.lang.String toSource(java.lang.String className,
                                     Instances data)
                              throws java.lang.Exception

  Returns a string that describes the filter as source. The filter will be contained in a class with the given name (there may be auxiliary classes), and will contain two methods with these signatures:

       // converts one row
       public static Object[] filter(Object[] i);
       // converts a full dataset (first dimension is row index)
       public static Object[][] filter(Object[][] i);

  where the array `i` contains elements that are either Double, String, with missing values represented as null. The generated code is public domain and comes with no warranty.

  Specified by:
    `toSource` in interface `Sourcable`
  Parameters:
    `className` - the name that should be given to the source class.
    `data` - the dataset used for initializing the filter
  Returns:
    the object source described by a string
  Throws:
    `java.lang.Exception` - if the source can't be computed

### getMinArray

    public double[] getMinArray()

  Returns the calculated minimum values for the attributes in the data.

  Returns:
    the array with the minimum values

### getMaxArray

    public double[] getMaxArray()

  Returns the calculated maximum values for the attributes in the data.

  Returns:
    the array with the maximum values

### scaleTipText

    public java.lang.String scaleTipText()

  Returns the tip text for this property.

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

### getScale

    public double getScale()

  Get the scaling factor.

  Returns:
    the factor

### setScale

    public void setScale(double value)

  Sets the scaling factor.

  Parameters:
    `value` - the scaling factor

### translationTipText

    public java.lang.String translationTipText()

  Returns the tip text for this property.

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

### getTranslation

    public double getTranslation()

  Get the translation.

  Returns:
    the translation

### setTranslation

    public void setTranslation(double value)

  Sets the translation.

  Parameters:
    `value` - the translation

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

### main

    public static void main(java.lang.String[] args)

  Main method for running this filter.

  Parameters:
    `args` - should contain arguments to the filter, use -h for help

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