aima.core.probability.util

Class RandVar

java.lang.Object

aima.core.probability.util.RandVar

All Implemented Interfaces:

Proposition, TermProposition, RandomVariable

public class RandVar
extends java.lang.Object
implements RandomVariable, TermProposition

Default implementation of the RandomVariable interface. Note: Also implements the TermProposition interface so its easy to use RandomVariables in conjunction with propositions about them in the Probability Model APIs.

Author:

Ciaran O'Reilly

Constructor Summary

Constructors

Constructor and Description
RandVar(java.lang.String name, Domain domain)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
Domain	getDomain()
java.lang.String	getName()
java.util.Set<RandomVariable>	getScope()
RandomVariable	getTermVariable()
java.util.Set<RandomVariable>	getUnboundScope()
int	hashCode()
boolean	holds(java.util.Map<RandomVariable,java.lang.Object> possibleWorld) Determine whether or not the proposition holds in a particular possible world.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RandVar

public RandVar(java.lang.String name,
               Domain domain)

Method Detail

getName

public java.lang.String getName()

Specified by:

getName in interface RandomVariable

Returns:

the name used to uniquely identify this variable.

getDomain

public Domain getDomain()

Specified by:

getDomain in interface RandomVariable

Returns:

the Set of possible values the Random Variable can take on.

getTermVariable

public RandomVariable getTermVariable()

Specified by:

getTermVariable in interface TermProposition

Returns:

The Term's Variable.

getScope

public java.util.Set<RandomVariable> getScope()

Specified by:

getScope in interface Proposition

Returns:

the Set of RandomVariables in the World (sample space) that this Proposition is applicable to.

getUnboundScope

public java.util.Set<RandomVariable> getUnboundScope()

Specified by:

getUnboundScope in interface Proposition

Returns:

the Set of RandomVariables from this propositions scope that are not constrained to any particular set of values (e.g. bound = P(Total = 11), while unbound = P(Total)). If a variable is unbound it implies the distributions associated with the variable is being sought.

holds

public boolean holds(java.util.Map<RandomVariable,java.lang.Object> possibleWorld)

Description copied from interface: Proposition

Determine whether or not the proposition holds in a particular possible world.

Specified by:

holds in interface Proposition

Parameters:

possibleWorld - A possible world is defined to be an assignment of values to all of the random variables under consideration.

Returns:

true if the proposition holds in the given possible world, false otherwise.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object