From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by yquem.inria.fr (Postfix) with ESMTP id A3410D179 for ; Wed, 27 Jul 2005 11:14:10 +0200 (CEST) Received: from ptb-relay01.plus.net (ptb-relay01.plus.net [212.159.14.212]) by nez-perce.inria.fr (8.13.0/8.13.0) with ESMTP id j6R9EAWo020007 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Wed, 27 Jul 2005 11:14:10 +0200 Received: from [80.229.56.224] (helo=chetara) by ptb-relay01.plus.net with esmtp (Exim) id 1DxhzN-0006RF-3O for caml-list@yquem.inria.fr; Wed, 27 Jul 2005 10:14:09 +0100 From: Jon Harrop Organization: Flying Frog Consultancy Ltd. To: caml-list@yquem.inria.fr Subject: Set union/inter/diff efficiency Date: Wed, 27 Jul 2005 10:12:01 +0100 User-Agent: KMail/1.7.2 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200507271012.02020.jon@ffconsultancy.com> X-Miltered: at nez-perce with ID 42E75062.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; implements:01 ocaml:01 quicker:98 frog:98 overlap:01 pair:01 functions:01 diff:01 diff:01 caml:02 objective:02 module:03 module:03 probably:05 efficiency:05 X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=disabled version=3.0.3 Does anyone have any ideas or references on how the union/inter/diff functions of the Set module could be optimised by accepting a sequence of sets rather than a pair at a time? For example, if A overlaps B overlaps C but A does not overlap C then it is probably quicker to compute the union "(A U C) U B" rather than "A U B U C". Better still, does anyone have a replacement Set module which implements this functionality? -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. Objective CAML for Scientists http://www.ffconsultancy.com/products/ocaml_for_scientists