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## weka.clusterers
Class MakeDensityBasedClusterer

    java.lang.Object
      weka.clusterers.Clusterer
          weka.clusterers.DensityBasedClusterer
              weka.clusterers.MakeDensityBasedClusterer

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, NumberOfClustersRequestable, OptionHandler, WeightedInstancesHandler

    public class MakeDensityBasedClusterer

extends DensityBasedClusterer
implements NumberOfClustersRequestable, OptionHandler, WeightedInstancesHandler

Class for wrapping a Clusterer to make it return a distribution and density. Fits normal distributions and discrete distributions within each cluster produced by the wrapped clusterer. Supports the NumberOfClustersRequestable interface only if the wrapped Clusterer does.

Version:
  $Revision: 1.5.2.2 $
Author:
  Richard Kirkby (rkirkby@cs.waikato.ac.nz), Mark Hall (mhall@cs.waikato.ac.nz), Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`MakeDensityBasedClusterer()` Default constructor.
`MakeDensityBasedClusterer(Clusterer toWrap)` Contructs a MakeDensityBasedClusterer wrapping a given Clusterer.

Method Summary
`void` | `buildClusterer(Instances data)` Builds a clusterer for a set of instances.
`double[]` | `clusterPriors()` Returns the cluster priors.
`Clusterer` | `getClusterer()` Gets the clusterer being wrapped.
`double` | `getMinStdDev()` Get the minimum allowable standard deviation.
`java.lang.String[]` | `getOptions()` Gets the current settings of the clusterer.
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options..
`double[]` | `logDensityPerClusterForInstance(Instance inst)` Computes the log of the conditional density (per cluster) for a given instance.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`java.lang.String` | `minStdDevTipText()` Returns the tip text for this property
`int` | `numberOfClusters()` Returns the number of clusters.
`void` | `setClusterer(Clusterer toWrap)` Sets the clusterer to wrap.
`void` | `setMinStdDev(double m)` Set the minimum value for standard deviation when calculating normal density.
`void` | `setNumClusters(int n)` Set the number of clusters to generate.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`java.lang.String` | `toString()` Returns a description of the clusterer.

Methods inherited from class weka.clusterers.DensityBasedClusterer
`distributionForInstance, logDensityForInstance, logJointDensitiesForInstance, makeCopies`

Methods inherited from class weka.clusterers.Clusterer
`clusterInstance, forName, makeCopies`

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

Constructor Detail

### MakeDensityBasedClusterer

    public MakeDensityBasedClusterer()

  Default constructor.

### MakeDensityBasedClusterer

    public MakeDensityBasedClusterer(Clusterer toWrap)

  Contructs a MakeDensityBasedClusterer wrapping a given Clusterer.

  Parameters:
    `toWrap` - the clusterer to wrap around

Method Detail

### setNumClusters

    public void setNumClusters(int n)
                        throws java.lang.Exception

  Set the number of clusters to generate.

  Specified by:
    `setNumClusters` in interface `NumberOfClustersRequestable`
  Parameters:
    `n` - the number of clusters to generate
  Throws:
    `java.lang.Exception` - if the wrapped clusterer has not been set, or if the wrapped clusterer does not implement this facility.

### buildClusterer

    public void buildClusterer(Instances data)
                        throws java.lang.Exception

  Builds a clusterer for a set of instances.

  Specified by:
    `buildClusterer` in class `Clusterer`
  Parameters:
    `instances` - the instances to train the clusterer with
  Throws:
    `java.lang.Exception` - if the clusterer hasn't been set or something goes wrong

### clusterPriors

    public double[] clusterPriors()

  Returns the cluster priors.

  Specified by:
    `clusterPriors` in class `DensityBasedClusterer`
  Returns:
    the prior probability for each cluster

### logDensityPerClusterForInstance

    public double[] logDensityPerClusterForInstance(Instance inst)
                                             throws java.lang.Exception

  Computes the log of the conditional density (per cluster) for a given instance.

  Specified by:
    `logDensityPerClusterForInstance` in class `DensityBasedClusterer`
  Parameters:
    `instance` - the instance to compute the density for
  Returns:
    the density.
  Throws:
    `java.lang.Exception` - if the density could not be computed successfully

### numberOfClusters

    public int numberOfClusters()
                         throws java.lang.Exception

  Returns the number of clusters.

  Specified by:
    `numberOfClusters` in class `Clusterer`
  Returns:
    the number of clusters generated for a training dataset.
  Throws:
    `java.lang.Exception` - if number of clusters could not be returned successfully

### toString

    public java.lang.String toString()

  Returns a description of the clusterer.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a string containing a description of the clusterer

### setClusterer

    public void setClusterer(Clusterer toWrap)

  Sets the clusterer to wrap.

  Parameters:
    `toWrap` - the clusterer

### getClusterer

    public Clusterer getClusterer()

  Gets the clusterer being wrapped.

  Returns:
    the clusterer

### minStdDevTipText

    public java.lang.String minStdDevTipText()

  Returns the tip text for this property

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

### setMinStdDev

    public void setMinStdDev(double m)

  Set the minimum value for standard deviation when calculating normal density. Reducing this value can help prevent arithmetic overflow resulting from multiplying large densities (arising from small standard deviations) when there are many singleton or near singleton values.

  Parameters:
    `m` - minimum value for standard deviation

### getMinStdDev

    public double getMinStdDev()

  Get the minimum allowable standard deviation.

  Returns:
    the minumum allowable standard deviation

### 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 given list of options. Valid options are:

  -W clusterer name
  Clusterer to wrap. (required)

  -M
  Set the minimum allowable standard deviation for normal density calculation.

  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 clusterer.

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

### main

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

  Main method for testing this class.

  Parameters:
    `argv` - the options

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