jbnc.graphs
Class BNCInference

java.lang.Object
  jbnc.graphs.BNCInference

public class BNCInference

extends java.lang.Object

Efficient calculation of the joint probability distribution and and conditional probability of the class variable given values of all attributes. Assumes that all nodes are instantiated.

Since:

June 1, 1999

Author:

Jarek Sacha

Field Summary

protected double[]	condClassProb
protected int	nbClasses
protected int	nbVars
protected double[][]	probFuncs Probability function values for each of the network nodes.
protected int[][]	radix Used to calculate index within the probFunction.
protected int[][]	variables Variables for each of the probability function.

Constructor Summary

BNCInference(BayesianNetworks.BayesNet net)

Method Summary

double[]	getCondClassProb(int[] aCase) Return values of the class node conditional probability given instantiation of attribute variables.
double	getJointProb(int[] aCase) Return the value of the joint probability for the instantiation of the variables given by parameter 'vars'.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

nbVars

protected int nbVars

nbClasses

protected int nbClasses

probFuncs

protected double[][] probFuncs

Probability function values for each of the network nodes.

variables

protected int[][] variables

Variables for each of the probability function.

radix

protected int[][] radix

Used to calculate index within the probFunction.

condClassProb

protected double[] condClassProb

Constructor Detail

BNCInference

public BNCInference(BayesianNetworks.BayesNet net)
             throws java.lang.Exception

Parameters:

net - Description of Parameter

Throws:

java.lang.Exception - Description of Exception

Method Detail

getJointProb

public double getJointProb(int[] aCase)
                    throws java.lang.Exception

Return the value of the joint probability for the instantiation of the variables given by parameter 'vars'.

Parameters:

aCase - Values for each of the varaibles in the network. The last variable is class variable.

Returns:

The JointProb value

Throws:

java.lang.Exception - when size of array 'aCase' is different then expected.

getCondClassProb

public double[] getCondClassProb(int[] aCase)
                          throws java.lang.Exception

Return values of the class node conditional probability given instantiation of attribute variables.

Parameters:

aCase - Values for each of the varaibles in the network. The last variable is class variable. Its value is ignored.

Returns:

The CondClassProb value

Throws:

java.lang.Exception - when size of array 'aCase' is different then expected.