net.sf.tweety.math.term

Class Minimum

java.lang.Object

net.sf.tweety.math.term.Term

net.sf.tweety.math.term.AssociativeOperation

net.sf.tweety.math.term.Minimum

public class Minimum
extends AssociativeOperation

This class models the minimum of two terms.

Author:

Matthias Thimm

Constructor Summary

Constructors

Constructor and Description
Minimum(List<Term> terms) Creates a new minimum with the given list of terms.
Minimum(Term first, Term second) Creates a new minimum with the given terms.

Method Summary

Modifier and Type	Method and Description
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<Maximum>	getMaximums() Returns all maximums of this term.
Set<Minimum>	getMinimums() Returns all minimums of 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.
String	toString()
Constant	value() Computes the actual value of this term if it contains no variables.

Methods inherited from class net.sf.tweety.math.term.AssociativeOperation

addAllTerm, addTerm, collapseAssociativeOperations, getAbsoluteValues, getProducts, getTerms, getVariables, isInteger, removeTerm, size

Methods inherited from class net.sf.tweety.math.term.Term

add, doubleValue, evaluateMatrix, evaluateVector, evaluateVector, isContinuous, isLinear, min, minus, mult, replaceAllTerms, replaceAllTerms

Methods inherited from class java.lang.Object

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

Constructor Detail

Minimum

public Minimum(Term first,
               Term second)

Creates a new minimum with the given terms.

Parameters:

first - a term.

second - a term.

Minimum

public Minimum(List<Term> terms)

Creates a new minimum with the given list of terms.

Parameters:

terms - a list of terms.

Method Detail

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.

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"

getMinimums

public Set<Minimum> getMinimums()

Description copied from class: Term

Returns all minimums of this term.

Overrides:

getMinimums in class AssociativeOperation

Returns:

all minimums of this 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

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.

derive

public Term derive(Variable v)
            throws NonDifferentiableException

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.

Throws:

NonDifferentiableException - if the term cannot be differentiated.

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.

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

Returns:

"true" iff this term is continuous in v.

toString

public String toString()

Specified by:

toString in class Term

getMaximums

public Set<Maximum> getMaximums()

Description copied from class: Term

Returns all maximums of this term.

Overrides:

getMaximums in class AssociativeOperation

Returns:

all maximums of this term.