Append elements of list to other list in Prolog

Asked Apr 04 '20 at 17:40

Active Apr 10 '20 at 10:34

Viewed 25 times

I'm trying to learn Prolog and got stuck on a very simple problem. I need a function that will take one list and appends its elements to other list creating list of lists from them.

Lets say list1=[A,B] and list2=[0,1,2]. I need to generate list3=[[A,B,0],[A,B,1],[A,B,2]].

I thought there would be a function that works like this as it looks really simple. I didn't found anything useful, so I wanted to implement it but I couldn't even do that. I got stuck with "iterating" over the list and got it only working when list2 would be just an atom using maplist.

If anyone could show me how to do that I would be very grateful. Thank you.

edited Apr 10 '20 at 10:34

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asked Apr 04 '20 at 17:40

Ondřej

Hint: use `append/3`. – Willem Van Onsem Apr 04 '20 at 17:47
@WillemVanOnsem OP wants to end with list of list and not a single level list. – Guy Coder Apr 04 '20 at 17:48
@GuyCoder: yes, you can make a variant of `append/3` that can be used in `maplist/3` :) – Willem Van Onsem Apr 04 '20 at 17:49
I'll look into it if I find anything useful it looks a bit similar, but it's a different problem. – Ondřej Apr 04 '20 at 18:13
That sounds like something for `maplist/3`. Take a look [at my notes](https://github.com/dtonhofer/prolog_notes/blob/master/maplist_3_examples.md). – David Tonhofer Apr 04 '20 at 18:59
Thank you, that actually solves my problem. I didn't know the first argument can be so complex. You notes explain it very well. – Ondřej Apr 04 '20 at 19:19

Append elements of list to other list in Prolog

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