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Hello to everyone, I am studying from a prolog tutorial, but I have stuck in a programm, and can't figure it out at all. It's the perm predicate, I think it's in the prolog or sth, it's definition is this(with the definition of takeout too that it uses): takeout(X,[X|R],R)...

Hey, write it in English to get answers.

Ok, thank you.:)

When I put trace, reverse_list([5]). ,it says undefined reverse_list/1, however there is a definition for reverse_list/2.

Thank you.

Hi, I don't understand how this programm works. reverse_list([], []). reverse_list([Head | Tail], ReversedList) :- reverse_list(Tail, ReversedTail), append(ReversedTail, [Head], ReversedList). It is assumed to reverse a list, but I don't know what calls does it make and with what order. Can...

Ok, now I got it thanks. I didn't understand why B is [6,7], it's a little bit difficult, but now I get it. We use backtracking.

In the 2 elements list, B was []. Now, in the 4 elements list, B is [[6,7]] from the clause you made that I didn't understand. I also don't understand this: "B is the result of couples([6, 7], B)." I'm quite confused. :S

No, I understand this equivalence, what I don't understand is this: "We know that couples([6, 7], B) computes B = [[6, 7]] because [6, 7] is a 2-element list.

Ok, I understand with two elements. The problem is with four elements, but you don't have to explain it if you don't want to.

Sorry, I am not English and I can't explain it further. I' m talking about the meaning here and in the meaning we use firstly the if clause. That's what I 'm saying. In the Swi- prolog, it is obvious that it happens secondly, not firstly I was wrong. I didn't understand how B is [[6,7]].

Yes, but again you explained me about what Swi-prolog does, I am talking about the meaning here. How can we say if for sth, if it happens first in the Swi-prolog and the meaning? That's what I'm saying. And also, I would like you to tell me if you can, what is saved in the B list when we insert...

Thank you, but I asked the opposite. What's the translation, the meaning of the second rule if we use if. Since the meaning starts from the second clause with if, then how the first action (the separation of H and H1) happens first. Now you got it?

But I have a general question, which for example in this programm, is that since we separate the H and H1 in the head of the rule, how can the body be the first action? Do you get what I mean? That we say first the body, but the first action is on the head of the rule. I don't understand how...

Oh sorry I had forgotten the first rule....

But when I insert couples([4,5,6,7,8,9],S). it says false. :S

I didn't understand what I had done wrong, but I understood the explanation of the correct programm. :) About the first rule, I translated that when we finish rule 2, what shall we have for rule 1? So, my translation was wrong if you get it. Thank you so much for everything! Be well!

Sorry, pair_list is another name for couples.. So, my programm is that: couples([], _). couples([H, H1|A], B) :- append([H], [H1], L), couples(A, [L|B]). Sorry, I don't understand your explanation, what I thought my programm does is: First, seperates H and H1 from the body. It uses append to...

Hi, I want to apologize to all and especially Mr. Kahleen for my continuous asking for help, but I have boggled. Here's what I have to do next, I have a list A and a list B with the couples of the elements of list A, for example: list A=[4,5,6,7,8,9] and list B=[[4,5],[6,7],[8,9]]. I have made a...

Oh, ok:) Thanks :) And I was trying to figure out! Thank you very much, I have another one programm and this is the end for now. :)