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PROLOG QUESTIONS

Turning off warnings in swi-prolog
Turning off warnings in swi-prolog
this one helps. Instead, you could fix the warning.The discontiguous directive is needed when the clauses of a static (compiled) predicate cannot be compiled as a single unit. This happens when the clause definitions are:
TAG : prolog
Date : November 06 2020, 07:00 PM , By : user3856978
Generate list and check if the values are increasing
Generate list and check if the values are increasing
it fixes the issue I do not really see why you specify a function gen/3 here. You can use an accumulator, and thus each time update the accumulator, like:
TAG : prolog
Date : October 14 2020, 03:00 AM , By : sothinbelle
Prolog stucks after giving the result
Prolog stucks after giving the result
This might help you So I have this knowledge base and I am trying to achieve the goals in the code given as comments. , What causes it?
TAG : prolog
Date : October 14 2020, 12:00 AM , By : Sachin Jindal
Hints to understand splendid program to solve Queens
Hints to understand splendid program to solve Queens
With these it helps Let us first look at the top predicate. Here we solve the N×N queens problem by calling queens(N,Qs). The first call in the body length(Qs, N) constructs a list of variables with length N. Next it calls place_queens/4 with place_q
TAG : prolog
Date : October 13 2020, 08:00 PM , By : Diogo Pereira
Generating a sequence of leap years using clpfd
Generating a sequence of leap years using clpfd
seems to work fine The code below checks whether a given year is a leap year or not. The arithmetic is formulated using declarative integer arithmetic from the library clpfd, in order that the query can be run in 'reverse' to generate a sequence of l
TAG : prolog
Date : October 13 2020, 06:00 AM , By : no name
Assigning values in a predicate
Assigning values in a predicate
Hope that helps Please don't do it like this. is/2 is for evaluating arithmetic expressions.Without any context whatsoever it is difficult impossible to suggest what is the right way to do it. The traditional way is to have a predicate that looks lik
TAG : prolog
Date : October 12 2020, 09:00 PM , By : mholloway
When does Prolog break lines?
When does Prolog break lines?
Hope this helps All bindings (Var = Value) appear on their own line, except when two or more variables are bound to the same value. In that case it uses the following syntax on a single line.
TAG : prolog
Date : October 10 2020, 02:00 PM , By : Sigit Purnomo
Equality of sets
Equality of sets
Any of those help It really really depends on how the predicate is going to be used.Assuming that a "set" is indeed a Prolog list without duplicates but not in any particular order; then two sets in that presentation "coincide" if they are permutatio
TAG : prolog
Date : October 10 2020, 12:00 PM , By : Jeremy Serious
How to solve a knapsack problem in CLP(B)
How to solve a knapsack problem in CLP(B)
should help you out You can model size(weight) constraints by issuing new variables to account for the weight, then use card constraint to model capacity of the backpack and finally using weighted_maximum/2 to maximize objective:
TAG : prolog
Date : October 09 2020, 09:00 PM , By : Giovanny Tarifeño Pe
(prolog) Can i abstract all the permutations of this pattern instead of having to write each one individually?
(prolog) Can i abstract all the permutations of this pattern instead of having to write each one individually?
like below fixes the issue I'm just starting out with prolog and though I think I'm getting a pretty good handle on how to use it, I've hit a wall here. I have a rule like this: , This is what I would do:
TAG : prolog
Date : October 08 2020, 12:00 AM , By : vishwanath Reshmimat
Prolog query with default for missing values
Prolog query with default for missing values
Does that help Say I have the following database in Prolog. , OK. I worked it out :
TAG : prolog
Date : October 07 2020, 07:00 AM , By : Christopher Kelly
What is the equivalent of an "outer join" in Prolog?
What is the equivalent of an "outer join" in Prolog?
Does that help You can approximate the behaviour of (a specific) SQL query in this way:
TAG : prolog
Date : October 07 2020, 07:00 AM , By : Robert Astle
compute the ranking of a parameter in the list
compute the ranking of a parameter in the list
Does that help I would use findall/3 and nth1/3 builtins:
TAG : prolog
Date : October 06 2020, 03:00 PM , By : r.m.Vivek arni
How to generate a grid of predicates in Prolog?
How to generate a grid of predicates in Prolog?
With these it helps Here's my solution:First we set the stage and make some access predicates:
TAG : prolog
Date : October 06 2020, 03:00 AM , By : Eric Milsson
Superpermutation in Prolog
Superpermutation in Prolog
around this issue Here is a brute-force implementation with an attempt to build shorter solutions first.
TAG : prolog
Date : October 05 2020, 01:00 PM , By : SJenkins62
Approximate value of sin by Taylor series
Approximate value of sin by Taylor series
fixed the issue. Will look into that further Cannot recognize the correct nth-term in your code... where is the factorial computation hidden? Remember that early time optimizations are roots of every evils in SW engineering :)A straightforward transl
TAG : prolog
Date : October 04 2020, 03:00 PM , By : Nutty Luang
Prolog Error: `character' expected, found `"((.).)"' (a string)
Prolog Error: `character' expected, found `"((.).)"' (a string)
it fixes the issue The best way to solve such problems is to start with the abstract representation first. Abstract means that all syntactic details have been removed. What you actually want is trees of the following form
TAG : prolog
Date : October 03 2020, 10:00 AM , By : Nadya
obtaining the rest of a clause as a list and creating a list of lists
obtaining the rest of a clause as a list and creating a list of lists
Hope this helps Whenever you consider a Prolog programming problem, you need to clarify the aspects that are important to you.
TAG : prolog
Date : September 30 2020, 02:00 PM , By : necati
Does it matter what is unification terms sequence?
Does it matter what is unification terms sequence?
Does that help A difference that shows simply by replacing X = Y by Y = X is highly unlikely.As long as you consider syntactic unification (using the occurs-check) or rational tree unification, the only differences might be some minimal performance d
TAG : prolog
Date : September 28 2020, 02:00 AM , By : PSTCAT
Prolog, generate all combinations of n balanced brackets
Prolog, generate all combinations of n balanced brackets
Any of those help This is what dcgs are best for. We define a grammar for balanced round brackets and then enumerate them accordingly.
TAG : prolog
Date : September 27 2020, 04:00 AM , By : Smart max
Fitltering in findall
Fitltering in findall
it should still fix some issue I have rule: , You can enforce that in the goal:
TAG : prolog
Date : September 27 2020, 03:00 AM , By : DamjanT
advanced prolog tricks for 2019?
advanced prolog tricks for 2019?
I wish this help you I can refer you to Logtalk language. it augments Prolog with objects.https://logtalk.org/
TAG : prolog
Date : September 26 2020, 07:00 PM , By : Jarrar Haider
Calculate whether the sum of exactly three values in a list is equal to N
Calculate whether the sum of exactly three values in a list is equal to N
I wish this helpful for you You can make use of append/3 [swi-doc] here to pick an element from a list, and get access to the rest of the elements (the elements after that element). By applying this technique three times, we thus obtain three items f
TAG : prolog
Date : September 24 2020, 08:00 PM , By : Bálint Réthelyi
Prolog Quicksort using second element as a pivot
Prolog Quicksort using second element as a pivot
I hope this helps . However, when I try to sort the list with qsort([8, 3, 4, 12, 25, 4, 6, 1, 9, 22, 6], Sorted). It simply returns false. What am I doing wrong?
TAG : prolog
Date : September 24 2020, 03:00 AM , By : Jones R
Constraint Handling Rules in SWI Prolog: Does the "constraint store" exists only for the duration of the tople
Constraint Handling Rules in SWI Prolog: Does the "constraint store" exists only for the duration of the tople
This might help you In regards to "How do I get results of CHR computation back into Prolog?".You can do something like:
TAG : prolog
Date : September 24 2020, 01:00 AM , By : Pratik Choudhury
Check if the structure is Binary Tree with prolog
Check if the structure is Binary Tree with prolog
Hope that helps I think you make this too complicated. We can define a predicate here to check intervals with a null value to check for (un)bounded intervals. For example:
TAG : prolog
Date : September 23 2020, 11:00 PM , By : Zwerty12
Prolog going though a list and turning the odd number to even by doubling all the odd numbers in the list
Prolog going though a list and turning the odd number to even by doubling all the odd numbers in the list
wish helps you toEven(L1, L2) takes an input list of integers and generates an output list L2 which is L1 with all odd integers changed into even by doubling each odd number.
TAG : prolog
Date : September 23 2020, 03:00 PM , By : varathu rajan
how to compare elements of a lists in prolog
how to compare elements of a lists in prolog
should help you out how do you compare two lists to see if then are different , What about as follows ?
TAG : prolog
Date : September 23 2020, 07:00 AM , By : Aleksandar T
Two lists have at least one common element without Prolog built-in predicates
Two lists have at least one common element without Prolog built-in predicates
will be helpful for those in need I am new to prolog.I want to write compare_lists/2 which will compare 2 lists and return true if they have at least one common element. I know this can be done with something like that , You can write the member func
TAG : prolog
Date : September 23 2020, 05:00 AM , By : Sudip
Copy all the elements of one list N times in a new list Prolog
Copy all the elements of one list N times in a new list Prolog
I think the issue was by ths following , How can I copy all the elements of one list N times in a new list with simple commands of Prolog without using Maplist,findall or libraries. , A twist on Willem's first solution:
TAG : prolog
Date : September 22 2020, 04:00 PM , By : Jay WS
Querying a data knowledge in prolog
Querying a data knowledge in prolog
This might help you You can enforce order in the terms Zi, by adding constraints Zi @< Zi+1. Here we thus use the (@
TAG : prolog
Date : September 20 2020, 04:00 PM , By : Varinder Deol
CLP(FD) variable domains & propagation
CLP(FD) variable domains & propagation
help you fix your problem In my Prolog course the past semester, I fell a little behind around the time CLP was introduced. Now I'm trying to catch up, and have tried my hand at a past exam that the professor supplied to all students. , It seems to m
TAG : prolog
Date : September 14 2020, 08:00 PM , By : Alaa
Prolog logical programming Binary tree predicates
Prolog logical programming Binary tree predicates
it fixes the issue A binary tree is just a data structure. I would represent it as something like tree(L,R,V), where L is the left subtree, R is the right subtree, and V is the value of that node.
TAG : prolog
Date : September 14 2020, 04:00 PM , By : adriansyah
Exclude variants/rotations of lists in solutions SWI-Prolog
Exclude variants/rotations of lists in solutions SWI-Prolog
Hope this helps So what you want is to identify certain symmetries. At first glance you would have to compare all possible solutions with such. That is, in addition of paying the cost of generating all possible solutions you will then compare them to
TAG : prolog
Date : September 12 2020, 11:00 AM , By : Karthik M
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