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## weka.core.neighboursearch
Class PerformanceStats

    java.lang.Object
      weka.core.neighboursearch.PerformanceStats

All Implemented Interfaces:
  java.io.Serializable, AdditionalMeasureProducer, RevisionHandler

Direct Known Subclasses:
  TreePerformanceStats

    public class PerformanceStats

extends java.lang.Object
implements AdditionalMeasureProducer, java.io.Serializable, RevisionHandler

The class that measures the performance of a nearest neighbour search (NNS) algorithm.

Version:
  $Revision: 5953 $
Author:
  Ashraf M. Kibriya (amk14[at-the-rate]cs[dot]waikato[dot]ac[dot]nz)
See Also:
  Serialized Form

Field Summary
`double` | `m_CoordCount` The number of coordinates looked at for the current/last query.
`double` | `m_MaxC` The min and max coordinates(attributes) looked at per query.
`double` | `m_MaxP` The min and max data points looked for a query by the NNS algorithm.
`double` | `m_MinC` The min and max coordinates(attributes) looked at per query.
`double` | `m_MinP` The min and max data points looked for a query by the NNS algorithm.
`double` | `m_PointCount` The number of data points looked at for the current/last query.
`double` | `m_SumC` The sum of coordinates/attributes looked at for all the queries.
`double` | `m_SumP` The sum of data points looked at for all the queries.
`double` | `m_SumSqC` The squared sum of coordinates/attributes looked at for all the queries.
`double` | `m_SumSqP` The squared sum of data points looked at for all the queries.

Constructor Summary
`PerformanceStats()` default constructor.

Method Summary
`java.util.Enumeration` | `enumerateMeasures()` Returns an enumeration of the additional measure names.
`double` | `getMaxCoordsPerPoint()` Returns the maximum of coords per point.
`double` | `getMaxPointsVisited()` Returns the maximum of points visited.
`double` | `getMeanCoordsPerPoint()` Returns the mean of coords per point.
`double` | `getMeanPointsVisited()` Returns the mean of points visited.
`double` | `getMeasure(java.lang.String additionalMeasureName)` Returns the value of the named measure.
`double` | `getMinCoordsPerPoint()` Returns the minimum of coords per point.
`double` | `getMinPointsVisited()` Returns the minimum of points visited.
`int` | `getNumQueries()` Returns the number of queries.
`java.lang.String` | `getRevision()` Returns the revision string.
`java.lang.String` | `getStats()` Returns a string representation of the statistics.
`double` | `getStdDevCoordsPerPoint()` Returns the standard deviation of coords per point.
`double` | `getStdDevPointsVisited()` Returns the standard deviation of points visited.
`double` | `getTotalCoordsPerPoint()` Returns the total sum of coords per point.
`double` | `getTotalPointsVisited()` Returns the total number of points visited.
`void` | `incrCoordCount()` Increments the coordinate count (number of coordinates/attributes looked at).
`void` | `incrPointCount()` Increments the point count (number of datapoints looked at).
`void` | `reset()` Resets all internal fields/counters.
`void` | `searchFinish()` Signals end of the nearest neighbour search.
`void` | `searchStart()` Signals start of the nearest neighbour search.
`void` | `updatePointCount(int n)` adds the given number to the point count.

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

Field Detail

### m_MinP

    public double m_MinP

  The min and max data points looked for a query by the NNS algorithm.

### m_MaxP

    public double m_MaxP

  The min and max data points looked for a query by the NNS algorithm.

### m_SumP

    public double m_SumP

  The sum of data points looked at for all the queries.

### m_SumSqP

    public double m_SumSqP

  The squared sum of data points looked at for all the queries.

### m_PointCount

    public double m_PointCount

  The number of data points looked at for the current/last query.

### m_MinC

    public double m_MinC

  The min and max coordinates(attributes) looked at per query.

### m_MaxC

    public double m_MaxC

  The min and max coordinates(attributes) looked at per query.

### m_SumC

    public double m_SumC

  The sum of coordinates/attributes looked at for all the queries.

### m_SumSqC

    public double m_SumSqC

  The squared sum of coordinates/attributes looked at for all the queries.

### m_CoordCount

    public double m_CoordCount

  The number of coordinates looked at for the current/last query.

Constructor Detail

### PerformanceStats

    public PerformanceStats()

  default constructor.

Method Detail

### reset

    public void reset()

  Resets all internal fields/counters.

### searchStart

    public void searchStart()

  Signals start of the nearest neighbour search. Initializes the stats object.

### searchFinish

    public void searchFinish()

  Signals end of the nearest neighbour search. Calculates the statistics for the search.

### incrPointCount

    public void incrPointCount()

  Increments the point count (number of datapoints looked at).

### incrCoordCount

    public void incrCoordCount()

  Increments the coordinate count (number of coordinates/attributes looked at).

### updatePointCount

    public void updatePointCount(int n)

  adds the given number to the point count.

  Parameters:
    `n` - The number to add to the point count.

### getNumQueries

    public int getNumQueries()

  Returns the number of queries.

  Returns:
    The number of queries.

### getTotalPointsVisited

    public double getTotalPointsVisited()

  Returns the total number of points visited.

  Returns:
    The total number.

### getMeanPointsVisited

    public double getMeanPointsVisited()

  Returns the mean of points visited.

  Returns:
    The mean points visited.

### getStdDevPointsVisited

    public double getStdDevPointsVisited()

  Returns the standard deviation of points visited.

  Returns:
    The standard deviation.

### getMinPointsVisited

    public double getMinPointsVisited()

  Returns the minimum of points visited.

  Returns:
    The minimum.

### getMaxPointsVisited

    public double getMaxPointsVisited()

  Returns the maximum of points visited.

  Returns:
    The maximum.

### getTotalCoordsPerPoint

    public double getTotalCoordsPerPoint()

  Returns the total sum of coords per point.

  Returns:
    The total per point.

### getMeanCoordsPerPoint

    public double getMeanCoordsPerPoint()

  Returns the mean of coords per point.

  Returns:
    The mean.

### getStdDevCoordsPerPoint

    public double getStdDevCoordsPerPoint()

  Returns the standard deviation of coords per point.

  Returns:
    The standard deviation.

### getMinCoordsPerPoint

    public double getMinCoordsPerPoint()

  Returns the minimum of coords per point.

  Returns:
    The minimum.

### getMaxCoordsPerPoint

    public double getMaxCoordsPerPoint()

  Returns the maximum of coords per point.

  Returns:
    The maximum.

### enumerateMeasures

    public java.util.Enumeration enumerateMeasures()

  Returns an enumeration of the additional measure names.

  Specified by:
    `enumerateMeasures` in interface `AdditionalMeasureProducer`
  Returns:
    An enumeration of the measure names.

### getMeasure

    public double getMeasure(java.lang.String additionalMeasureName)
                      throws java.lang.IllegalArgumentException

  Returns the value of the named measure.

  Specified by:
    `getMeasure` in interface `AdditionalMeasureProducer`
  Parameters:
    `additionalMeasureName` - The name of the measure to query for its value.
  Returns:
    The value of the named measure.
  Throws:
    `java.lang.IllegalArgumentException` - If the named measure is not supported.

### getStats

    public java.lang.String getStats()

  Returns a string representation of the statistics.

  Returns:
    The statistics as string.

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

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