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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 · When dealing with exactly two arguments and no need for a particular name, A-B represents an pair and library(pairs) has some useful functionality for a list of pairs. Typically though, invent a good name, e.g., point(X,Y) .
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,...
threepath(A, D, Ps) :- Ps = [[A,B,_T0,T1],[B,C,T2,T3],[C,D,T4,_T5]], T2 #> T1, T4 #> T3, trains(Ts), tuples_in(Ps, Ts). In this example, the unique solution is found without labeling: ?- threepath(1, 4, Ps). Ps = [[1, 2, 0, 1], [2, 3, 4, 5], [3, 4, 8, 9]].
26 Απρ 2019 · Prolog terms come in four kinds: numbers, atoms, variables, and compound terms. An atom is a name. Atoms are written in one of four ways. § A sequence of letters, digits, and/or underscores, beginning with a lower-case letter. Example: foo7 § The above with a backslash prepended. Example: \foo7
Logic Programming. To express programs in a form of symbolic logic, and use a logic inferencing process to produce results. Symbolic logic is the study of symbolic abstractions that capture the formal features of logical inference. Logic programs are declarative. Formal Logic.
?- 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.
