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Date: | 2002-08-09 (06:43) |
From: | Florian Hars <florian@h...> |
Subject: | Re: [Caml-list] Side effect |
Nicolas FRANCOIS (AKA El Bofo) wrote: > So matrix m was modified. But I work on a copy of m in > Pivot_Z.pivot_ligne_sans_echange. What's the problem doc ? Yes, m' is a copy of m, but the elements of m are arrays, so the copy m' contains references to the same arrays that m contains, so m.(i).(j) is the same cell as m'.(i).(j). See: Objective Caml version 3.04 # let m = [|[|1;2|];[|3;4|]|];; val m : int array array = [|[|1; 2|]; [|3; 4|]|] # let m' = Array.copy m;; val m' : int array array = [|[|1; 2|]; [|3; 4|]|] # m'.(1).(1)<-99;; - : unit = () # m';; - : int array array = [|[|1; 2|]; [|3; 99|]|] # m;; - : int array array = [|[|1; 2|]; [|3; 99|]|] # m'.(1) <- [|0;0|];; - : unit = () # m' ;; - : int array array = [|[|1; 2|]; [|0; 0|]|] # m;; - : int array array = [|[|1; 2|]; [|3; 99|]|] # Yours, Florian. ------------------- 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