Package net.sf.tweety.logics.mln.syntax

Class MlnFormula

    • Field Detail

      • formula

        private FolFormula formula
        the first-order formula.

      • weight

        private java.lang.Double weight
        The weight of the formula (null means that the formula is strict).

    • Constructor Detail

      • MlnFormula

        public MlnFormula​(FolFormula formula)
        Creates a new strict MLN formula with the given formula.
        Parameters:
        formula - the first-order formula.

      • MlnFormula

        public MlnFormula​(FolFormula formula,
                  java.lang.Double weight)
        Creates a new MLN formula with the given formula and weight.
        Parameters:
        formula - the first-order formula.
        weight - the weight of the formula (null means that the formula is strict).

      • MlnFormula

        public MlnFormula​(FolFormula formula,
                  Probability p)
        Creates a new MLN formula and estimates its weight w by the given probability p using the formula w = log(p/(1-p)*f) where "f" is the ratio of the number of worlds not satisfying the formula and the worlds satisfying the formula.
        Parameters:
        formula - the first-order formula.
        p - the intended probability of the formula.

    • Method Detail

      • getPredicates

        public java.util.Set<? extends Predicate> getPredicates()
        Description copied from interface: SimpleLogicalFormula
        Processes the set of all predicates which appear in this formula
        Returns:
        all predicates that appear in this formula

      • containsQuantifier

        public boolean containsQuantifier()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula contains any quantification.
        Returns:
        "true" if this formula contains a quantification.

      • substitute

        public RelationalFormula substitute​(Term<?> v,
                                    Term<?> t)
                             throws java.lang.IllegalArgumentException
        Description copied from class: RelationalFormula
        Substitutes all occurrences of term "v" in this formula by term "t" and returns the new formula. NOTE: if "v" is a variable and bound to a quantifier then "v" is not substituted in that quantifiers inner formula.
        Specified by:
        substitute in interface ComplexLogicalFormula
        Specified by:
        substitute in class RelationalFormula
        Parameters:
        v - the term to be substituted.
        t - the term to substitute.
        Returns:
        a formula where every occurrence of "v" is replaced by "t".
        Throws:
        java.lang.IllegalArgumentException - if "v" and "t" are of different sorts (NOTE: this exception is only thrown when "v" actually appears in this formula).

      • getUnboundVariables

        public java.util.Set<Variable> getUnboundVariables()
        Returns:
        a set of of unbound variables

      • isClosed

        public boolean isClosed()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is closed, i.e. whether every variables occurring in the formula is bound by a quantifier.
        Returns:
        "true" if this formula is closed, "false" otherwise.

      • isClosed

        public boolean isClosed​(java.util.Set<Variable> boundVariables)
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is closed, i.e. whether every variables occurring in the formula is bound by a quantifier. Every variable in "boundVariables" is already assumed to be bound.
        Parameters:
        boundVariables - the variables assumed to be bound.
        Returns:
        "true" if this formula is closed wrt. "boundVariables", "false" otherwise.

      • isWellBound

        public boolean isWellBound()
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is well-bound, i.e. whether no variable bound by a quantifier is again bound by another quantifier within the first quantifier's range.
        Returns:
        "true" if this formula is well-bound, "false" otherwise.

      • isWellBound

        public boolean isWellBound​(java.util.Set<Variable> boundVariables)
        Description copied from interface: QuantifiedFormula
        Checks whether this formula is well-bound, i.e. whether no variable bound by a quantifier is again bound by another quantifier within the first quantifier range. Every variable in "boundVariables" is assumed to be bound already.
        Parameters:
        boundVariables - the variables assumed to be bound.
        Returns:
        "true" if this formula is well-bound, "false" otherwise.

      • getWeight

        public java.lang.Double getWeight()
        Returns the weight.
        Returns:
        the weight.

      • isStrict

        public boolean isStrict()
        Returns "true" iff this formula is strict.
        Returns:
        "true" iff this formula is strict.

      • isLiteral

        public boolean isLiteral()
        Returns:
        true if the formula represents a literal in the language or false otherwise

      • getTerms

        public java.util.Set<Term<?>> getTerms()
        Returns:
        a set containing all terms of this logical structure

      • getTerms

        public <C extends Term<?>> java.util.Set<C> getTerms​(java.lang.Class<C> cls)
        Description copied from interface: LogicStructure
        Processes the set containing all terms of type C. This method uses the equals method of the given Class and therefore does not add terms which are sub classes of type C to the set.
        Type Parameters:
        C - the type of terms
        Parameters:
        cls - The Class structure containing type information about the searched term
        Returns:
        A set containing all terms of type C of this logical structure

      • getQuantifierVariables

        public java.util.Set<Variable> getQuantifierVariables()
        Returns:
        a set containing all quantified variables

      • getSignature

        public FolSignature getSignature()
        Description copied from interface: Formula
        Returns the signature of the language of this formula.
        Returns:
        the signature of the language of this formula.