Package net.sf.tweety.math.term

Class Difference

  • public class Difference
extends Term
    This class models a difference between two terms.
    Author:
    Matthias Thimm

    • Constructor Detail

      • Difference

        public Difference​(Term first,
                  Term second)
        Creates a new difference with the given terms.
        Parameters:
        first - a term.
        second - a term.

    • 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"

      • 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 java.lang.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:
        java.lang.IllegalArgumentException - if this term cannot be converted into a linear normal form.

      • 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.

      • 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.

      • toString

        public java.lang.String toString()
        Specified by:
        toString in class Term

      • getVariables

        public java.util.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 java.util.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.

      • getMinimums

        public java.util.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 java.util.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 java.util.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.

      • isInteger

        public boolean isInteger()
        Description copied from class: Term
        Checks whether this term represents an integer value.
        Specified by:
        isInteger in class Term
        Returns:
        "true" iff this term represents an integer value.

      • 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