From: Michal Moskal <malekith@pld-linux.org>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Array.filter (was Multi-keyed lookup table?)
Date: Sun, 10 Aug 2003 21:53:07 +0200 [thread overview]
Message-ID: <20030810195307.GA19113@roke.freak> (raw)
In-Reply-To: <20030809184851.GA946@localhost>
On Sat, Aug 09, 2003 at 11:48:51AM -0700, ijtrotts@ucdavis.edu wrote:
> # module Array = struct
> include Array
> let filter f a = Array.init (Array.length a) (fun i -> f a.(i))
> end;;
> # Array.filter (fun x -> x * x) [| 1;2;3 |];;
> - : int array = [|1; 4; 9|]
This is map, not filter. Writing filter is more difficult, since you
need to first make list of results and then put them into array (or use
Obj.magic tricks).
--
: Michal Moskal :: http://www.kernel.pl/~malekith : GCS {C,UL}++++$ a? !tv
: When in doubt, use brute force. -- Ken Thompson : {E-,w}-- {b++,e}>+++ h
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next prev parent reply other threads:[~2003-08-10 19:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-07 19:41 [Caml-list] Multi-keyed lookup table? Matt Gushee
2003-08-07 20:16 ` Brian Hurt
2003-08-07 21:49 ` Yaron Minsky
2003-08-07 22:26 ` John Max Skaller
[not found] ` <D4DBD8568F05D511A1C20002A55C008C11AC05E6@uswaumsx03medge.med.ge.com>
2003-08-08 21:30 ` Matt Gushee
2003-08-08 22:13 ` Brian Hurt
[not found] ` <005d01c35e51$7c927200$6628f9c1@zofo>
2003-08-09 16:57 ` [Caml-list] Array.filter (was Multi-keyed lookup table?) Matt Gushee
2003-08-09 18:48 ` ijtrotts
2003-08-10 19:53 ` Michal Moskal [this message]
2003-08-10 2:34 ` ijtrotts
2003-08-11 5:48 ` David Brown
2003-08-10 18:53 ` ijtrotts
2003-08-10 20:23 ` Marcin 'Qrczak' Kowalczyk
2003-08-10 2:37 ` ijtrotts
[not found] ` <200308102222.16369.qrczak@knm.org.pl>
2003-08-10 20:43 ` Michal Moskal
2003-08-10 21:59 ` Ville-Pertti Keinonen
2003-08-10 20:55 ` [Caml-list] Array.filter Jean-Baptiste Rouquier
2003-08-11 9:46 ` Michal Moskal
2003-08-10 22:29 ` [Caml-list] Array.filter (was Multi-keyed lookup table?) Shawn Wagner
2003-08-11 11:51 ` [Caml-list] Multi-keyed lookup table? Remi Vanicat
2003-08-07 22:19 ` John Max Skaller
2003-08-12 6:34 ` Florian Hars
2003-08-12 9:58 ` Michael Wohlwend
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