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pl:prolog:pllib:list_duplicates_remove [2019/06/27 15:50] |
pl:prolog:pllib:list_duplicates_remove [2019/06/27 15:50] (aktualna) |
| ====== List duplicates remove ====== |
| {{tag>lists}} |
| ===== Description ===== |
| Removing duplicates from a list. |
| |
| **Source**: The Art of Prolog |
| ===== Download ===== |
| Program source code: {{list_duplicates_remove.pl}} |
| ===== Listing ===== |
| <code prolog> |
| /* |
| no_doubles(Xs,Ys) :- |
| Ys is the list obtained by removing |
| duplicate elements from the list Xs. |
| */ |
| |
| no_doubles([X|Xs],Ys) :- |
| member(X,Xs), no_doubles(Xs,Ys). |
| no_doubles([X|Xs],[X|Ys]) :- |
| nonmember(X,Xs), no_doubles(Xs,Ys). |
| no_doubles([],[]). |
| |
| nonmember(X,[Y|Ys]) :- X \== Y, nonmember(X,Ys). |
| nonmember(X,[]). |
| |
| % Program 7.9 Removing duplicates from a list |
| </code> |
| ===== Comments ===== |
| |