Package org.tweetyproject.math.term

Class Constant

java.lang.Object

org.tweetyproject.math.term.Term

org.tweetyproject.math.term.Constant

Direct Known Subclasses:

FloatConstant, IntegerConstant

public abstract class Constant
extends Term

This class models an abstract constant, e.g. a float or an integer.

Author:

Matthias Thimm

Constructor Summary

Constructors

Constructor	Description
Constant()	Constructor

Method Summary

Modifier and Type	Method	Description
void	collapseAssociativeOperations()	This method collapses all associative operations appearing in this term, e.g.
Term	derive(Variable v)	Differentiates the term with respect to the given variable.
void	expandAssociativeOperations()	This method expands all associative operations appearing in this term, e.g.
Set<AbsoluteValue>	getAbsoluteValues()	Returns all absolute values of this term.
Set<Maximum>	getMaximums()	Returns all maximums of this term.
Set<Minimum>	getMinimums()	Returns all minimums of this term.
Set<Product>	getProducts()	Returns all products of this term.
Set<Sum>	getSums()	Returns all sums of this term.
List<Term>	getTerms()	Getter Terms
Set<Variable>	getVariables()	Returns all variables in this term.
boolean	isContinuous(Variable v)	Checks whether this term is continuous in v.
Term	replaceTerm(Term toSubstitute, Term substitution)	Replaces each occurrence of "toSubstitute" by "substitution" and return the new term.
Term	simplify()	Simplifies this term in an equivalent way: - Replaces products that contain a zero by the constant zero - Removes a term one from products - Removes a term zero from sums - Aggregates constants in sums, products, and minimums - Evaluates functional terms on constants - Simplifies fractions where possible.
Sum	toLinearForm()	Converts this term into a linear normal form, i.e.
Sum	toQuadraticForm()	Return a quadratic form
Constant	value()	Computes the actual value of this term if it contains no variables.

Methods inherited from class org.tweetyproject.math.term.Term

add, doubleValue, evaluateMatrix, evaluateVector, evaluateVector, isContinuous, isInteger, isLinear, isQuadratic, min, minus, mult, replaceAllTerms, replaceAllTerms, toString

Methods inherited from class java.lang.Object

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

Constructor Details

Constant

public Constant()

Constructor

Method Details

value

public Constant value()

Description copied from class: Term

Computes the actual value of this term if it contains no variables.

Specified by:

value in class Term

Returns:

the value of this term, either a float or an integer.

getVariables

public Set<Variable> getVariables()

Description copied from class: Term

Returns all variables in this term.

Specified by:

getVariables in class Term

Returns:

all variables in this term.

getProducts

public Set<Product> getProducts()

Description copied from class: Term

Returns all products of this term.

Specified by:

getProducts in class Term

Returns:

all products of this term.

getSums

public Set<Sum> getSums()

Description copied from class: Term

Returns all sums of this term.

Specified by:

getSums in class Term

Returns:

all sums of this term.

getMinimums

public Set<Minimum> getMinimums()

Description copied from class: Term

Returns all minimums of this term.

Specified by:

getMinimums in class Term

Returns:

all minimums of this term.

getMaximums

public Set<Maximum> getMaximums()

Description copied from class: Term

Returns all maximums of this term.

Specified by:

getMaximums in class Term

Returns:

all maximums of this term.

getAbsoluteValues

public Set<AbsoluteValue> getAbsoluteValues()

Description copied from class: Term

Returns all absolute values of this term.

Specified by:

getAbsoluteValues in class Term

Returns:

all absolute values of this term.

collapseAssociativeOperations

public void collapseAssociativeOperations()

Description copied from class: Term

This method collapses all associative operations appearing in this term, e.g. every min{min{a,b},c} becomes min{a,b,c}.

Specified by:

collapseAssociativeOperations in class Term

expandAssociativeOperations

public void expandAssociativeOperations()

Description copied from class: Term

This method expands all associative operations appearing in this term, e.g. every min{a,b,c} becomes min{min{a,b},c}.

Specified by:

expandAssociativeOperations in class Term

simplify

public Term simplify()

Description copied from class: Term

Simplifies this term in an equivalent way:
- Replaces products that contain a zero by the constant zero
- Removes a term one from products
- Removes a term zero from sums
- Aggregates constants in sums, products, and minimums
- Evaluates functional terms on constants
- Simplifies fractions where possible.

Specified by:

simplify in class Term

Returns:

the simplified term.

getTerms

public List<Term> getTerms()

Description copied from class: Term

Getter Terms

Specified by:

getTerms in class Term

Returns:

List of Terms

toLinearForm

public Sum toLinearForm()
                 throws IllegalArgumentException

Description copied from class: Term

Converts this term into a linear normal form, i.e. into a sum of products of a constant and a variable.

Specified by:

toLinearForm in class Term

Returns:

a term in linear normal form.

Throws:

IllegalArgumentException - if this term cannot be converted into a linear normal form.

toQuadraticForm

public Sum toQuadraticForm()
                    throws IllegalArgumentException

Description copied from class: Term

Return a quadratic form

Specified by:

toQuadraticForm in class Term

Returns:

a quadratic form

Throws:

IllegalArgumentException - error

derive

public Term derive(Variable v)

Description copied from class: Term

Differentiates the term with respect to the given variable.

Specified by:

derive in class Term

Parameters:

v - a variable.

Returns:

the derivation of this term wrt. the given variable.

isContinuous

public boolean isContinuous(Variable v)

Description copied from class: Term

Checks whether this term is continuous in v.

Specified by:

isContinuous in class Term

Parameters:

v - a variable

Returns:

"true" iff this term is continuous in v.

replaceTerm

public Term replaceTerm(Term toSubstitute,
 Term substitution)

Description copied from class: Term

Replaces each occurrence of "toSubstitute" by "substitution" and return the new term.

Specified by:

replaceTerm in class Term

Parameters:

toSubstitute - the term to be substituted

substitution - the new term

Returns:

this term where "toSubstitute" is replaced by "substitution"