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## weka.core
Class NormalizableDistance

    java.lang.Object
      weka.core.NormalizableDistance

All Implemented Interfaces:
  java.io.Serializable, DistanceFunction, OptionHandler, RevisionHandler

Direct Known Subclasses:
  AbstractStringDistanceFunction, ChebyshevDistance, EuclideanDistance, ManhattanDistance

    public abstract class NormalizableDistance

extends java.lang.Object
implements DistanceFunction, OptionHandler, java.io.Serializable, RevisionHandler

Represents the abstract ancestor for normalizable distance functions, like Euclidean or Manhattan distance.

Version:
  $Revision: 1.2 $
Author:
  Fracpete (fracpete at waikato dot ac dot nz), Gabi Schmidberger (gabi@cs.waikato.ac.nz) -- original code from weka.core.EuclideanDistance, Ashraf M. Kibriya (amk14@cs.waikato.ac.nz) -- original code from weka.core.EuclideanDistance
See Also:
  Serialized Form

Field Summary
`static int` | `R_MAX` Index in ranges for MAX.
`static int` | `R_MIN` Index in ranges for MIN.
`static int` | `R_WIDTH` Index in ranges for WIDTH.

Constructor Summary
`NormalizableDistance()` Invalidates the distance function, Instances must be still set.
`NormalizableDistance(Instances data)` Initializes the distance function and automatically initializes the ranges.

Method Summary
`java.lang.String` | `attributeIndicesTipText()` Returns the tip text for this property.
`double` | `distance(Instance first, Instance second)` Calculates the distance between two instances.
`double` | `distance(Instance first, Instance second, double cutOffValue)` Calculates the distance between two instances.
`double` | `distance(Instance first, Instance second, double cutOffValue, PerformanceStats stats)` Calculates the distance between two instances.
`double` | `distance(Instance first, Instance second, PerformanceStats stats)` Calculates the distance between two instances.
`java.lang.String` | `dontNormalizeTipText()` Returns the tip text for this property.
`java.lang.String` | `getAttributeIndices()` Gets the range of attributes used in the calculation of the distance.
`boolean` | `getDontNormalize()` Gets whether if the attribute values are to be normazlied in distance calculation.
`Instances` | `getInstances()` returns the instances currently set.
`boolean` | `getInvertSelection()` Gets whether the matching sense of attribute indices is inverted or not.
`java.lang.String[]` | `getOptions()` Gets the current settings.
`double[][]` | `getRanges()` Method to get the ranges.
`abstract java.lang.String` | `globalInfo()` Returns a string describing this object.
`double[][]` | `initializeRanges()` Initializes the ranges using all instances of the dataset.
`double[][]` | `initializeRanges(int[] instList)` Initializes the ranges of a subset of the instances of this dataset.
`double[][]` | `initializeRanges(int[] instList, int startIdx, int endIdx)` Initializes the ranges of a subset of the instances of this dataset.
`void` | `initializeRangesEmpty(int numAtt, double[][] ranges)` Used to initialize the ranges.
`boolean` | `inRanges(Instance instance, double[][] ranges)` Test if an instance is within the given ranges.
`java.lang.String` | `invertSelectionTipText()` Returns the tip text for this property.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`void` | `postProcessDistances(double[] distances)` Does nothing, derived classes may override it though.
`boolean` | `rangesSet()` Check if ranges are set.
`void` | `setAttributeIndices(java.lang.String value)` Sets the range of attributes to use in the calculation of the distance.
`void` | `setDontNormalize(boolean dontNormalize)` Sets whether if the attribute values are to be normalized in distance calculation.
`void` | `setInstances(Instances insts)` Sets the instances.
`void` | `setInvertSelection(boolean value)` Sets whether the matching sense of attribute indices is inverted or not.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`java.lang.String` | `toString()` Returns an empty string.
`void` | `update(Instance ins)` Update the distance function (if necessary) for the newly added instance.
`void` | `updateRanges(Instance instance)` Update the ranges if a new instance comes.
`double[][]` | `updateRanges(Instance instance, double[][] ranges)` Updates the ranges given a new instance.
`void` | `updateRanges(Instance instance, int numAtt, double[][] ranges)` Updates the minimum and maximum and width values for all the attributes based on a new instance.
`void` | `updateRangesFirst(Instance instance, int numAtt, double[][] ranges)` Used to initialize the ranges.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface weka.core.RevisionHandler
`getRevision`

Field Detail

### R_MIN

    public static final int R_MIN

  Index in ranges for MIN.

  See Also:
    Constant Field Values

### R_MAX

    public static final int R_MAX

  Index in ranges for MAX.

  See Also:
    Constant Field Values

### R_WIDTH

    public static final int R_WIDTH

  Index in ranges for WIDTH.

  See Also:
    Constant Field Values

Constructor Detail

### NormalizableDistance

    public NormalizableDistance()

  Invalidates the distance function, Instances must be still set.

### NormalizableDistance

    public NormalizableDistance(Instances data)

  Initializes the distance function and automatically initializes the ranges.

  Parameters:
    `data` - the instances the distance function should work on

Method Detail

### globalInfo

    public abstract java.lang.String globalInfo()

  Returns a string describing this object.

  Returns:
    a description of the evaluator 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.

### getOptions

    public java.lang.String[] getOptions()

  Gets the current settings. Returns empty array.

  Specified by:
    `getOptions` in interface `OptionHandler`
  Returns:
    an array of strings suitable for passing to setOptions()

### setOptions

    public void setOptions(java.lang.String[] options)
                    throws java.lang.Exception

  Parses a given list of options.

  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

### dontNormalizeTipText

    public java.lang.String dontNormalizeTipText()

  Returns the tip text for this property.

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

### setDontNormalize

    public void setDontNormalize(boolean dontNormalize)

  Sets whether if the attribute values are to be normalized in distance calculation.

  Parameters:
    `dontNormalize` - if true the values are not normalized

### getDontNormalize

    public boolean getDontNormalize()

  Gets whether if the attribute values are to be normazlied in distance calculation. (default false i.e. attribute values are normalized.)

  Returns:
    false if values get normalized

### 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

### setAttributeIndices

    public void setAttributeIndices(java.lang.String value)

  Sets the range of attributes to use in the calculation of the distance. The indices start from 1, 'first' and 'last' are valid as well. E.g.: first-3,5,6-last

  Specified by:
    `setAttributeIndices` in interface `DistanceFunction`
  Parameters:
    `value` - the new attribute index range

### getAttributeIndices

    public java.lang.String getAttributeIndices()

  Gets the range of attributes used in the calculation of the distance.

  Specified by:
    `getAttributeIndices` in interface `DistanceFunction`
  Returns:
    the attribute index range

### 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

### setInvertSelection

    public void setInvertSelection(boolean value)

  Sets whether the matching sense of attribute indices is inverted or not.

  Specified by:
    `setInvertSelection` in interface `DistanceFunction`
  Parameters:
    `value` - if true the matching sense is inverted

### getInvertSelection

    public boolean getInvertSelection()

  Gets whether the matching sense of attribute indices is inverted or not.

  Specified by:
    `getInvertSelection` in interface `DistanceFunction`
  Returns:
    true if the matching sense is inverted

### setInstances

    public void setInstances(Instances insts)

  Sets the instances.

  Specified by:
    `setInstances` in interface `DistanceFunction`
  Parameters:
    `insts` - the instances to use

### getInstances

    public Instances getInstances()

  returns the instances currently set.

  Specified by:
    `getInstances` in interface `DistanceFunction`
  Returns:
    the current instances

### postProcessDistances

    public void postProcessDistances(double[] distances)

  Does nothing, derived classes may override it though.

  Specified by:
    `postProcessDistances` in interface `DistanceFunction`
  Parameters:
    `distances` - the distances to post-process

### update

    public void update(Instance ins)

  Update the distance function (if necessary) for the newly added instance.

  Specified by:
    `update` in interface `DistanceFunction`
  Parameters:
    `ins` - the instance to add

### distance

    public double distance(Instance first,
                           Instance second)

  Calculates the distance between two instances.

  Specified by:
    `distance` in interface `DistanceFunction`
  Parameters:
    `first` - the first instance
    `second` - the second instance
  Returns:
    the distance between the two given instances

### distance

    public double distance(Instance first,
                           Instance second,
                           PerformanceStats stats)

  Calculates the distance between two instances.

  Specified by:
    `distance` in interface `DistanceFunction`
  Parameters:
    `first` - the first instance
    `second` - the second instance
    `stats` - the performance stats object
  Returns:
    the distance between the two given instances

### distance

    public double distance(Instance first,
                           Instance second,
                           double cutOffValue)

  Calculates the distance between two instances. Offers speed up (if the distance function class in use supports it) in nearest neighbour search by taking into account the cutOff or maximum distance. Depending on the distance function class, post processing of the distances by postProcessDistances(double []) may be required if this function is used.

  Specified by:
    `distance` in interface `DistanceFunction`
  Parameters:
    `first` - the first instance
    `second` - the second instance
    `cutOffValue` - If the distance being calculated becomes larger than cutOffValue then the rest of the calculation is discarded.
  Returns:
    the distance between the two given instances or Double.POSITIVE_INFINITY if the distance being calculated becomes larger than cutOffValue.

### distance

    public double distance(Instance first,
                           Instance second,
                           double cutOffValue,
                           PerformanceStats stats)

  Calculates the distance between two instances. Offers speed up (if the distance function class in use supports it) in nearest neighbour search by taking into account the cutOff or maximum distance. Depending on the distance function class, post processing of the distances by postProcessDistances(double []) may be required if this function is used.

  Specified by:
    `distance` in interface `DistanceFunction`
  Parameters:
    `first` - the first instance
    `second` - the second instance
    `cutOffValue` - If the distance being calculated becomes larger than cutOffValue then the rest of the calculation is discarded.
    `stats` - the performance stats object
  Returns:
    the distance between the two given instances or Double.POSITIVE_INFINITY if the distance being calculated becomes larger than cutOffValue.

### initializeRanges

    public double[][] initializeRanges()

  Initializes the ranges using all instances of the dataset. Sets m_Ranges.

  Returns:
    the ranges

### updateRangesFirst

    public void updateRangesFirst(Instance instance,
                                  int numAtt,
                                  double[][] ranges)

  Used to initialize the ranges. For this the values of the first instance is used to save time. Sets low and high to the values of the first instance and width to zero.

  Parameters:
    `instance` - the new instance
    `numAtt` - number of attributes in the model
    `ranges` - low, high and width values for all attributes

### updateRanges

    public void updateRanges(Instance instance,
                             int numAtt,
                             double[][] ranges)

  Updates the minimum and maximum and width values for all the attributes based on a new instance.

  Parameters:
    `instance` - the new instance
    `numAtt` - number of attributes in the model
    `ranges` - low, high and width values for all attributes

### initializeRangesEmpty

    public void initializeRangesEmpty(int numAtt,
                                      double[][] ranges)

  Used to initialize the ranges.

  Parameters:
    `numAtt` - number of attributes in the model
    `ranges` - low, high and width values for all attributes

### updateRanges

    public double[][] updateRanges(Instance instance,
                                   double[][] ranges)

  Updates the ranges given a new instance.

  Parameters:
    `instance` - the new instance
    `ranges` - low, high and width values for all attributes
  Returns:
    the updated ranges

### initializeRanges

    public double[][] initializeRanges(int[] instList)
                                throws java.lang.Exception

  Initializes the ranges of a subset of the instances of this dataset. Therefore m_Ranges is not set.

  Parameters:
    `instList` - list of indexes of the subset
  Returns:
    the ranges
  Throws:
    `java.lang.Exception` - if something goes wrong

### initializeRanges

    public double[][] initializeRanges(int[] instList,
                                       int startIdx,
                                       int endIdx)
                                throws java.lang.Exception

  Initializes the ranges of a subset of the instances of this dataset. Therefore m_Ranges is not set. The caller of this method should ensure that the supplied start and end indices are valid (start <= end, end<instList.length etc) and correct.

  Parameters:
    `instList` - list of indexes of the instances
    `startIdx` - start index of the subset of instances in the indices array
    `endIdx` - end index of the subset of instances in the indices array
  Returns:
    the ranges
  Throws:
    `java.lang.Exception` - if something goes wrong

### updateRanges

    public void updateRanges(Instance instance)

  Update the ranges if a new instance comes.

  Parameters:
    `instance` - the new instance

### inRanges

    public boolean inRanges(Instance instance,
                            double[][] ranges)

  Test if an instance is within the given ranges.

  Parameters:
    `instance` - the instance
    `ranges` - the ranges the instance is tested to be in
  Returns:
    true if instance is within the ranges

### rangesSet

    public boolean rangesSet()

  Check if ranges are set.

  Returns:
    true if ranges are set

### getRanges

    public double[][] getRanges()
                         throws java.lang.Exception

  Method to get the ranges.

  Returns:
    the ranges
  Throws:
    `java.lang.Exception` - if no randes are set yet

### toString

    public java.lang.String toString()

  Returns an empty string.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    an empty string

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