edu.ksu.cis.bnj.bbn
Class BBNCPF

java.lang.Object
  edu.ksu.cis.bnj.bbn.BBNCPF

All Implemented Interfaces:

java.lang.Cloneable

public class BBNCPF

extends java.lang.Object

implements java.lang.Cloneable

Author:

Roby Joehanes

Field Summary

protected java.util.Hashtable	cpf We store the PDF in a hashtable.
protected java.util.Collection	nodeNames
protected int	tableArity

Constructor Summary

BBNCPF(java.util.Collection nodeNames)

Method Summary

void	add(BBNCPF cpt) Addition with another CPT.
java.lang.Object	clone()
void	divide(BBNCPF cpt) Division with another CPT.
void	divide(BBNPDF arg)
java.lang.String	dumpPDF() Dumping out the PDF.
BBNCPF	extract(java.util.Collection subset)
BBNCPF	extractExcept(java.util.Collection subset)
double	get(java.util.Hashtable values) Queries to the CPT (or CPF, in case of continuous value).
java.util.Hashtable	getTable()
void	multiply(BBNCPF cpt) Multiplication with another CPT.
void	multiply(BBNPDF arg)
void	normalize(java.lang.String base) Normalize.
void	normalizeAndFill(java.lang.String base) Normalize.
double	normalizedQuery(java.util.Hashtable values) Same as query, but normalized
void	put(java.util.Hashtable q, BBNPDF v) Populating the conditional probability function (CPF)
double	query(java.util.Hashtable v) Syntactical candy for get(Hashtable) to make naming consistent
java.util.List	queryColumn(java.util.Hashtable values)
void	remove(java.util.Hashtable q) Removing a specific entry from CPF.
void	resetEntries() Reset all CPT entries to zeroes.
void	setTable(java.util.Hashtable t)
void	subtract(BBNCPF cpt) Subtraction with another CPT.
java.lang.String	toString()
void	zeroEntryExcept(java.util.Hashtable q)

Methods inherited from class java.lang.Object

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

Field Detail

cpf

protected java.util.Hashtable cpf

We store the PDF in a hashtable.

nodeNames

protected java.util.Collection nodeNames

tableArity

protected int tableArity

Constructor Detail

BBNCPF

public BBNCPF(java.util.Collection nodeNames)

Method Detail

query

public double query(java.util.Hashtable v)

Syntactical candy for get(Hashtable) to make naming consistent

Parameters:

v -

Returns:

double

get

public double get(java.util.Hashtable values)

Queries to the CPT (or CPF, in case of continuous value).

Parameters:

values - The query values in a hash table

Returns:

double the return value.

normalizedQuery

public double normalizedQuery(java.util.Hashtable values)

Same as query, but normalized

Parameters:

values - The query values in a hash table

Returns:

double the return value.

resetEntries

public void resetEntries()

Reset all CPT entries to zeroes.

put

public void put(java.util.Hashtable q,
                BBNPDF v)

Populating the conditional probability function (CPF)

Parameters:

q - The query

v - The actual value

remove

public void remove(java.util.Hashtable q)

Removing a specific entry from CPF.

Parameters:

q - the query

zeroEntryExcept

public void zeroEntryExcept(java.util.Hashtable q)

dumpPDF

public java.lang.String dumpPDF()

Dumping out the PDF. For debugging only.

multiply

public void multiply(BBNCPF cpt)

Multiplication with another CPT. (this_cpt = this_cpt * other_cpt) Note: This function must be overhauled if we deal with continuous values!

Parameters:

cpt -

divide

public void divide(BBNCPF cpt)

Division with another CPT. (this_cpt = this_cpt / other_cpt) Note: This function must be overhauled if we deal with continuous values! Also, if the denominator is zero, the division is not carried out (otherwise Java will complain division by zero error).

Parameters:

cpt -

add

public void add(BBNCPF cpt)

Addition with another CPT. (this_cpt = this_cpt + other_cpt) Note: This function must be overhauled if we deal with continuous values!

Parameters:

cpt -

subtract

public void subtract(BBNCPF cpt)

Subtraction with another CPT. (this_cpt = this_cpt - other_cpt) Note: This function must be overhauled if we deal with continuous values!

Parameters:

cpt -

queryColumn

public java.util.List queryColumn(java.util.Hashtable values)

extract

public BBNCPF extract(java.util.Collection subset)

extractExcept

public BBNCPF extractExcept(java.util.Collection subset)

normalize

public void normalize(java.lang.String base)

Normalize. If the column total is 0.0, it may throw a divide by zero error

Parameters:

base - Name of the variable to be marginalized to 1.0

normalizeAndFill

public void normalizeAndFill(java.lang.String base)

Normalize. If the column total is 0.0, fill it with uniform values

Parameters:

base - Name of the variable to be marginalized to 1.0

multiply

public void multiply(BBNPDF arg)

divide

public void divide(BBNPDF arg)

setTable

public void setTable(java.util.Hashtable t)

getTable

public java.util.Hashtable getTable()

toString

public java.lang.String toString()

clone

public java.lang.Object clone()