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## weka.estimators
Class EstimatorUtils

    java.lang.Object
      weka.estimators.EstimatorUtils

All Implemented Interfaces:
  RevisionHandler

    public class EstimatorUtils

extends java.lang.Object
implements RevisionHandler

Contains static utility functions for Estimators.

Version:
  $Revision: 1.4 $
Author:
  Gabi Schmidberger (gabi@cs.waikato.ac.nz)

Constructor Summary
`EstimatorUtils()`

Method Summary
`static java.lang.String` | `cutpointsToString(double[] cutPoints, boolean[] cutAndLeft)` Returns a string representing the cutpoints
`static double` | `findMinDistance(Instances inst, int attrIndex)` Find the minimum distance between values
`static Instances` | `getInstancesFromClass(Instances data, int classIndex, double classValue)` Returns a dataset that contains of all instances of a certain class value.
`static java.util.Vector` | `getInstancesFromClass(Instances data, int attrIndex, int classIndex, double classValue, Instances workData)` Returns a dataset that contains all instances of a certain class value.
`static Instances` | `getInstancesFromValue(Instances data, int index, double v)` Returns a dataset that contains of all instances of a certain value for the given attribute.
`static int` | `getMinMax(Instances inst, int attrIndex, double[] minMax)` Find the minimum and the maximum of the attribute and return it in the last parameter..
`java.lang.String` | `getRevision()` Returns the revision string.
`static void` | `writeCurve(java.lang.String f, Estimator est, double min, double max, int numPoints)` Output of an n points of a density curve.
`static void` | `writeCurve(java.lang.String f, Estimator est, Estimator classEst, double classIndex, double min, double max, int numPoints)` Output of an n points of a density curve.

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

Constructor Detail

### EstimatorUtils

    public EstimatorUtils()

Method Detail

### findMinDistance

    public static double findMinDistance(Instances inst,
                                         int attrIndex)

  Find the minimum distance between values

  Parameters:
    `inst` - sorted instances, sorted
    `attrIndex` - index of the attribute, they are sorted after
  Returns:
    the minimal distance

### getMinMax

    public static int getMinMax(Instances inst,
                                int attrIndex,
                                double[] minMax)
                         throws java.lang.Exception

  Find the minimum and the maximum of the attribute and return it in the last parameter..

  Parameters:
    `inst` - instances used to build the estimator
    `attrIndex` - index of the attribute
    `minMax` - the array to return minimum and maximum in
  Returns:
    number of not missing values
  Throws:
    `java.lang.Exception` - if parameter minMax wasn't initialized properly

### getInstancesFromClass

    public static java.util.Vector getInstancesFromClass(Instances data,
                                                         int attrIndex,
                                                         int classIndex,
                                                         double classValue,
                                                         Instances workData)

  Returns a dataset that contains all instances of a certain class value.

  Parameters:
    `data` - dataset to select the instances from
    `attrIndex` - index of the relevant attribute
    `classIndex` - index of the class attribute
    `classValue` - the relevant class value
  Returns:
    a dataset with only

### getInstancesFromClass

    public static Instances getInstancesFromClass(Instances data,
                                                  int classIndex,
                                                  double classValue)

  Returns a dataset that contains of all instances of a certain class value.

  Parameters:
    `data` - dataset to select the instances from
    `classIndex` - index of the class attribute
    `classValue` - the class value
  Returns:
    a dataset with only instances of one class value

### writeCurve

    public static void writeCurve(java.lang.String f,
                                  Estimator est,
                                  double min,
                                  double max,
                                  int numPoints)
                           throws java.lang.Exception

  Output of an n points of a density curve. Filename is parameter f + ".curv".

  Parameters:
    `f` - string to build filename
    `est` -
    `min` -
    `max` -
    `numPoints` -
  Throws:
    `java.lang.Exception` - if something goes wrong

### writeCurve

    public static void writeCurve(java.lang.String f,
                                  Estimator est,
                                  Estimator classEst,
                                  double classIndex,
                                  double min,
                                  double max,
                                  int numPoints)
                           throws java.lang.Exception

  Output of an n points of a density curve. Filename is parameter f + ".curv".

  Parameters:
    `f` - string to build filename
    `est` -
    `classEst` -
    `classIndex` -
    `min` -
    `max` -
    `numPoints` -
  Throws:
    `java.lang.Exception` - if something goes wrong

### getInstancesFromValue

    public static Instances getInstancesFromValue(Instances data,
                                                  int index,
                                                  double v)

  Returns a dataset that contains of all instances of a certain value for the given attribute.

  Parameters:
    `data` - dataset to select the instances from
    `index` - the index of the attribute
    `v` - the value
  Returns:
    a subdataset with only instances of one value for the attribute

### cutpointsToString

    public static java.lang.String cutpointsToString(double[] cutPoints,
                                                     boolean[] cutAndLeft)

  Returns a string representing the cutpoints

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

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