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pl:prolog:pllib:list_duplicates_remove [2019/06/27 15:50] (aktualna) |
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| + | ====== 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 ===== | ||
