Package weka.datagenerators

Class Test

java.lang.Object
weka.datagenerators.Test
All Implemented Interfaces:
Serializable, RevisionHandler
public class Test extends Object implements Serializable, RevisionHandler
Class to represent a test.

The string representation of the test can be supplied in standard notation or for a subset of types of attributes in Prolog notation.
Following examples for all possible tests that can be represented by this class, given in standard notation.

Examples of tests for numeric attributes:
B >= 2.333
B < 4.56

Examples of tests for nominal attributes with more then 2 values:
A = rain
A != rain

Examples of tests for nominal attribute with exactly 2 values:
A = false
A = true


The Prolog notation is only supplied for numeric attributes and for nominal attributes that have the values "true" and "false".

Following examples for the Prolog notation provided.

Examples of tests for numeric attributes:
The same as for standard notation above.

Examples of tests for nominal attributes with values "true"and "false":
A
not(A)

(Other nominal attributes are not supported by the Prolog notation.)

Version:
$Revision: 10203 $
Author:
Gabi Schmidberger (gabi@cs.waikato.ac.nz)
See Also:

  • Constructor Details

    • Test

      public Test(int i, double s, Instances dataset)
      Constructor
      Parameters:
      i - the attribute index
      s - the split
      dataset - the dataset

    • Test

      public Test(int i, double s, Instances dataset, boolean n)
      Constructor
      Parameters:
      i - the attribute index
      s - the split
      dataset - the dataset
      n - whether to negate the test

  • Method Details

    • getNot

      public Test getNot()
      Negates the test.
      Returns:
      the test itself negated

    • passesTest

      public boolean passesTest(Instance inst) throws Exception
      Determines whether an instance passes the test.
      Parameters:
      inst - the instance
      Returns:
      true if the instance satisfies the test, false otherwise
      Throws:
      Exception - if something goes wrong

    • toString

      public String toString()
      Returns the test represented by a string.
      Overrides:
      toString in class Object
      Returns:
      a string representing the test

    • toPrologString

      public String toPrologString()
      Returns the test represented by a string in Prolog notation.
      Returns:
      a string representing the test in Prolog notation

    • equalTo

      public boolean equalTo(Test t)
      Compares the test with the test that is given as parameter.
      Parameters:
      t - the test the object is compared to
      Returns:
      true if the two Tests are equal

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Returns:
      the revision