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Search found 221 results on 9 pages for 'swi prolog'.

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• tuProlog unknow behavior

  - by Josh Guzman

  I'm using tuProlog to integrate Prolog with Java, to do so I'v been defined a .pl file wich contains this code: go:-write('hello world!'),nl. In my Java File at NetBeans i Have a Main Class that invokes this: Prolog engine = new Prolog(); Theory theory = new Theory(new FileInputStream("facultad.pl")); try { …

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• Problem when reading backslash in Prolog

  - by Jerry

  I'm writing a lexer in Prolog which will be used as a part of functional language interpreter. Language spec allows expressions like for example let \x = x + 2; to occur. What I want lexer to do for such input is to "return": [tokLet, tokLambda, tokVar(x), tokEq, tokVar(x), tokPlus, tokNumber(2), tokSColon] and the problem is, that…

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• Is this a good implementation of a loop in Prolog?

  - by Carles Araguz

  First of all, let me tell you that this happens to be the first time I ask something here, so if it's not the right place to do so, please forgive me. I'm developing a rather complex software that has a Prolog core implementing a FSM. Since I don't want it to stop (ever), I'm trying to write a good loop-like predicate that would work…

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• Real world Prolog usage

  - by Hank

  Many study Prolog in college, but I have personally not come in contact with it professionally. The traditional examples given are AI and expert system applications, but what have you used it for and what made Prolog a suitable language for the task?

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• Class Problem (c++ and prolog)

  - by Joshua Green

  I am using the C++ interface to Prolog (the classes and methods of SWI-cpp.h). For working out a simple backtracking that john likes mary and emma and sara: likes(john, mary). likes(john, emma). likes(john, ashley). I can just do: { PlFrame fr; PlTermv av(2); av[0] = PlCompound("john"); PlQuery q("likes", av); while…

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• Breadth-First in Prolog

  - by Ricardo

  What is the general idea of using breadth-first over the default depth-first search scheme in Prolog? Not taking infinite branches? Is there any general way to use breadth-first in Prolog? I've been googling around and I didn't find too much useful info for a novice.

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• Appending facts into an existing prolog file.

  - by vuj

  Hi, I'm having trouble inserting facts into an existing prolog file, without overwriting the original contents. Suppose I have a file test.pl: :- dynamic born/2. born(john,london). born(tim,manchester). If I load this in prolog, and I assert more facts: | ?- assert(born(laura,kent)). yes I'm aware I can save this by…

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• Prolog newbie question: Making a procedure to print Hello World

  - by dmindreader

  I want to load this simple something into my Editor: Write:-repeat,write("hi"),nl,fail. So that it prints "hi". What should I do? I'm currently trying to do File->New and Saving a file named Write into E:\Program Files\pl\xpce\prolog\lib When doing the query: ?-Write. It's printing: 1 ?- Write. % ... 1,000,000…

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• Prolog n00b question: Doing whatever

  - by dmindreader

  I want to load this simple something into my Editor: Write:-repeat,write("hi"),nl,fail. So that it prints "hi". What should I do? I'm currently trying to do File->New and Saving a file named Write into E:\Program Files\pl\xpce\prolog\lib When doing the query: ?-Write. It's printing: 1 ?- Write. % ... 1,000,000…

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• Factorial in Prolog and C++

  - by Joshua Green

  I would like to work out a number's factorial. My factorial rule is in a Prolog file and I am connecting it to a C++ code. Can someone tell me what is wrong with my C++ interface please? % factorial.pl factorial( 1, 1 ):- !. factorial( X, Fac ):- X > 1, Y is X - 1, factorial( Y, New_Fac ), Fac is…

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• Matching tuples in Prolog

  - by milosz

  Why does Prolog match (X, Xs) with a tuple containing more elements? An example: test2((X, Xs)) :- write(X), nl, test2(Xs). test2((X)) :- write(X), nl. test :- …

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• Prolog .. Can i convert from a list of chars to a string or term in Prolog !!

  - by AhmadAssaf

  i use read_line_to_codes(Stream,Line) to read a line from a file .. first is there any way to read a line and assign it to a term in prolog ?? if not i managed to read a line and put it in this char list .. now this char list contains spaces .. which is bad .. so i want to convert it to a term or a string in prolog so…

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• swi prolog- IDE - Eclipse- how to use it in Linux?

  - by francis gan

  I read that Swi Prolog IDE - Eclipse - in Linux(Ubuntu) is possible. However I couldn't get the installed Eclipse to 'use' swi Prolog. Please help

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• Prolog singleton variables in Python

  - by Rubens

  I'm working on a little set of scripts in python, and I came to this: line = "a b c d e f g" a, b, c, d, e, f, g = line.split() I'm quite aware of the fact that these are decisions taken during implementation, but shouldn't (or does) python offer something like: _, _, var_needed, _, _, another_var_needed, _ =…

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• Learn Prolog Now! exercise solutions

  - by Timothy

  Does anyone know where I can find solutions to the exercises and practical sessions to Learn Prolog Now? I started working through it and would to verify the answers that I devise.

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• Installing GNU Prolog on Mac OS X (getting a Bus Error)

  - by sixtyfootersdude

  Just installed gnu prolog on Mac OS X 10.4 but it is not working. When I go: % ./gprolog Bus error Anyone have any ideas? Thanks.

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• Power function in prolog

  - by NHans

  Exactly what's the prolog definition for power function. I wrote this code and it give some errors I wanna know exact code for the power function. pow(X,0,1). pow(X,Y,Z):-Y1=Y-1,pow(X,Y1,Z1),Z1=Z*X. Anything wrong with this code?

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• prolog interpreter on linux?

  - by anon

  I've decided to learn prolog. What's a good interpreter to use? Even better if it has a decent c/c++ ffi.

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• Good beginners material on Prolog

  - by meelow

  I am looking for good beginners material on Prolog, both online and printed. I am not only interested in 'learning the language' but also in background and scientific information.

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• amzi prolog + eclipse question

  - by alan

  hey guys i have a question regarding amzi prolog with eclipse, Im running a .pro file which executes a breadth first search and if queue gets too long, the following error message appears: system_error 1021 Control stack full. Compile code or increase .cfg parameter 'control' If so, how may i run the…

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• Prolog: Finding the Nth Element in a List

  - by Thomas

  I am attempting to locate the nth element of a List in Prolog. Here is the code I am attempting to use: Cells = [OK, _, _, _, _, _] . ... next_safe(_) :- facing(CurrentDirection), delta(CurrentDirection, Delta), in_cell(OldLoc), NewLoc is OldLoc + Delta, nth1(NewLoc, Cells, SafetyIdentifier),…

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• How to stop repetitions in rules in prolog

  - by Pradeep

  In my prolog rule marriedcouple(X,Y) :- parent((X,Z),bornin(_)), parent((Y,Z),bornin(_)), female(X),male(Y); male(X),female(Y), different(X,Y). when a parent has two kids, the couple shows twice. How can we prevent this ?

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• how to stop repititions in rules in prolog

  - by Pradeep

  in my prolog rule marriedcouple(X,Y) :- parent((X,Z),bornin()), parent((Y,Z),bornin()), female(X),male(Y); male(X),female(Y), different(X,Y). when a parent have two kids. the couple shows two times. how to stop this

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• Where is Prolog used for traffic control systems?

  - by Masi

  The user Laurent had an interesting reply to the question [Why hasn’t logic programming caught on?]: If you look at the influence logic-programming has had in the field of -- air traffic control -- I don't think it can be said logic-programming has not caught on. A question arises: …

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• Prolog - Sum up "positioned" elem in list

  - by wOOt

  Hi guys, any solution to this problem - given a list of numbers [1,2,3,4,5] write a Prolog program to sum up all the odd-positioned in this list ? odd([1,2,3,4,5],Sum) Sum = 9. (1+3+5)

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