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[Caml-list] List.sort
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Date: | 2002-06-19 (14:55) |
From: | Johann Spies <jspies@s...> |
Subject: | [Caml-list] List.sort |
I apologise for asking a newbie question on this list, but the beginners-list seems to have a problem. After 24 hours my message did not appear on the list and there was actually no activity the last few days. I am trying to figure out how to use List.sort. According to the manual the Persvasives.compare function is suitable to use with List.sort. I can't figure out how to use it: ---------------------------- # k;; - : int list = [3; 2; 1] # List.sort (compare 1 2) k;; This expression has type int but is here used with type 'a -> 'a -> int # List.sort (+) k;; - : int list = [1; 2; 3] # a;; - : char list = ['d'; 'b'; 'g'] # List.sort (+) a;; This expression has type char list but is here used with type int list # List.sort (compare 'a' 'b') a;; This expression has type int but is here used with type 'a -> 'a -> int # compare 'a' 'b';; - : int = -1 # --------------------- What is confusing to me is that the manual says: "Sort a list in increasing order according to a comparison function. The comparison function must return 0 if it arguments compare as equal, a positive integer if the first is greater, and a negative integer if the first is smaller. For example, the compare function is a suitable comparison function. " I could not find a single example on how to use this function in the manual. Can somebody show me how to use it please? Johann -- Johann Spies Telefoon: 021-808 4036 Informasietegnologie, Universiteit van Stellenbosch "My son, if sinners entice thee, consent thou not." Proverbs 1:10 ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners