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25 Μαΐ 2010 · Tuple term construction with the ,/2 operator is generally right-associative in PROLOG (typically referred to as a sequence), so your input of a, b(c), d(e(f)), g might well actually be the term (a, (b(c), (d(e(f)), g))).
9 Μαΐ 2022 · Which functor should I use to express Pair and Tuples? (x,y) or x-y? (x,y,z) or x-y-z? In the The Power of Prolog, the author says that Pairs are terms with principal functor (-)/2. I have some confusion because , …
?- tuples_in([[X,Y]], [[1,2],[1,5],[4,0],[4,3]]), X = 4. X = 4, Y in 0\/3. As another example, consider a train schedule represented as a list of quadruples, denoting departure and arrival places and times for each train.
14 Μαΐ 2018 · I haven't found how I can get the first/second element of a tuple in Prolog, I tried arg, but it only works on predicates. My list looks like this: Pairs = [ (pos(1, 2), pos(1, 3)), (pos(1,...
We can explicitly ask Prolog whether two given terms match by using the built-in equality-predicate = (written as an in x operator). ?- born(mary, yorkshire) = born(mary, X).
26 Απρ 2019 · Prolog: Simple Programming — Facts, Queries, Rules, Goals [2/2] A rule looks like a fact, then “ :-”, then a query. The term before “:-” is the head of the rule; afterward is the body of the rule, which gives conditions that must be satisfied. is_grandchild(A, B) :- is_child(A, X), is_child(X, B).
tuples_in(+Tuples, +Relation) True iff all Tuples are elements of Relation. Each element of the list Tuples is a list of integers or finite domain variables. Relation is a list of lists of integers. Arbitrary finite relations, such as compatibility tables, can be modeled in this way.
