- Haskell - Haskell.org

semi-private exports
by Hal Daume III 23 Apr '02

23 Apr '02

Hi again, all. In my NLP.Prelude file, I define: > newtype Token = Token [Word8] and I export only the type, not the constructor because I don't users of my package to be able to inspect/modify the list directly. However, in my NLP.IO module, in which I define IO for some of my data types, I need to be able to access it directly. In Java/C#, I would make Token public and the constructor protected (i.e., public for the current package but private for other people). I would really like to be able to do something similar. Any ideas? - Hal -- Hal Daume III "Computer science is no more about computers | hdaume(a)isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume

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module namespaces with "Prelude"
by Hal Daume III 23 Apr '02

23 Apr '02

I'm developing my package "NLP" for supporting common NLP functions and have a set of functions/datatypes that are common to almost all of my modules and I wanted to separate them off into an "NLP.Prelude" file, but this seems not to work. One of my modules imports Prelude (the Haskell one) directly so I can hide a few definitions, but then it looks at NLP/Prelude.lhs and complains that the name of that module "NLP.Prelude" doesn't match "Prelude". SHould I simply name my module "NLP.NLPPrelude" or something (which is ugly, imo) or what? -- Hal Daume III "Computer science is no more about computers | hdaume(a)isi.edu than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume

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how to call Fortran Procedures in Haskell Program?
by Zhe Fu 23 Apr '02

23 Apr '02

Does anybody know how to call Fortran procedures in Haskell program? I tried Green Card, but seems it only works with C codes. Thanks.

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RDP'03 - First announcement
by Salvador Lucas Alba 22 Apr '02

22 Apr '02

[Apologies for multiple copies of this announcement] ************************************************************************** ************************* First announcement *************************** ************************************************************************** Federated Conference on Rewriting, Deduction and Programming (RDP) http://www.dsic.upv.es/~rdp03 Valencia, Spain, June 8 - 14, 2003 -------------------------------------------------------------------------- We are pleased to announce the Federated Conference on Rewriting, Deduction and Programming (RDP) to be held in Valencia, Spain, in June 2003. The conference will be hosted by the Departamento de Sistemas Informaticos y Computacion (DSIC) at the Universidad Politecnica de Valencia. PARTICIPANTS 14th Int. Conference on Rewriting Techniques and Applications, RTA'03 6th Int. Conference on Typed Lambda Calculi and Applications, TLCA'03 4th Int. Workshop on First Order Theorem Proving, FTP'03 IFIP Working Group 1.6 on Term Rewriting 4th Int. Workshop on Rule Based Programming, RULE'03 16th Int. Workshop on Unification, UNIF'03 12th Int. Workshop on Functional and Logic Programming, WFLP'03 3rd Int. Workshop on Red. Strat. in Rewriting and Programming, WRS'03 6th Int. Workshop on Termination, WST'03 DATES RDP : June 8 - 14, 2003 RTA'03 : June 9 - 11 TLCA'03: June 10 - 12 FTP'03 : June 12 - 14 WG 1.6 : June 12 RULE'03: June 9 UNIF'03: June 8 - 9 WFLP'03: June 12 - 13 WRS'03 : June 8 WST'03 : June 13 - 14 ORGANIZERS The ELP group at the Universidad Politecnica de Valencia Officials: Salvador Lucas (chair of the organizing committee) Elvira Albert (secretary) Maria Alpuente (workshops chair) Jose Hernandez (local arrangements) Javier Oliver (secretary) Maria Jose Ramirez (local arrangements chair) German Vidal (publicity chair) CONTACT Salvador Lucas Departamento de Sistemas Informaticos y Computacion (DSIC) Universidad Politecnica de Valencia Camino de Vera, s/n E-46022 Valencia (Spain) phone: + 34 96 387 7353 (73531) fax: + 34 96 387 7359 e-mail: slucas(a)dsic.upv.es URL: http://www.dsic.upv.es/users/elp/slucas.html FURTHER INFORMATION RDP website: http://www.dsic.upv.es/~rdp03 The ELP group: http://www.dsic.upv.es/users/elp/elp.html **************************************************************************

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ICLP02 Call for Participation
by Peter Stuckey 22 Apr '02

22 Apr '02

------- Blind-Carbon-Copy X-Mailer: exmh version 2.5 10/15/1999 with version: MH 6.8.4 #1[UCI] To: pjs Subject: ICLP02 Call for Participation Reply-to: pjs(a)cs.mu.oz.au Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Date: Mon, 22 Apr 2002 10:32:18 +1000 Message-ID: <10795.1019435538(a)muldi.cs.mu.oz.au> From: Peter Stuckey <pjs(a)muldi.cs.mu.oz.au> Apologies for Receiving Multiple Copies of this Message - ---------------------------------------------------------- CALL FOR PARTICIPATION ICLP'02 Eighteenth International Conference on Logic Programming Copenhagen, Denmark July 29th - August 1, 2002 http://floc02.diku.dk/ICLP/ ICLP'02, the Eighteenth International Conference on Logic Programming will be held this year as part of the 2002 Federated Logic Conference (http://floc02.diku.dk/) = in conjunction with CADE, CAV, FME, LICS, RTA and TABLEAUX. ICLP'02 is sponsored by IF/Prolog (http://www.ifcomputer.de) Invited Speakers include: Pierre Wolper (Universite de Liege) Stefan Decker (Stanford) Invited Tutorials include: Constraint handling rules Thom Fruehwirth and Slim Abdennadher (LMU Munich) Program transformations for automated verification I.V. Ramakrishnan and Abhik Roychoudhury (SUNY-Stony Brook and NU= S) Answer set programming Mirek Truszczynski (Kentucky) Tabled logic programming David S. Warren, (SUNY-Stony Brook) Workshops: http://floc02.diku.dk/ICLP/wkstut.html The following workshops will be held in conjunction with ICLP'02. July 27: PCL - Paraconsistent Computational Logic Submission: April 30, 2002 July 27: SAVE - Specification, Analysis and Validation for Emerging = Technologies in Computational Logic Submission: April 27, 2002 July 27-28: NLULP - Natural Language Understanding and Logic Programming Submission: March 10, 2002 July 28: CLPSE - (Constraint) Logic Programming and Software Engineering Submission: May 31, 2002 July 31: CICLOPS - Colloquium on Implementation of Constraint and = LOgic Programming Systems Submission: April 30, 2002 July 31: WLPE - Workshop on Logic Programming Environments Submission: May 6, 2002 August 1: CLIMA - Computational Logic In Multi-Agent Systems Submission: April 30, 2002 Conference Location: The conference will be held at the University of Copenhagen. = Early registration is by June 15, 2002. See information about registration and hotels at http://floc02.diku.dk/ICLP/ Program Chair: Conference Chair: Peter J. Stuckey Henning Christiansen Department of Computer Science Department of Computer Science and Software Engineering Roskilde University University of Melbourne PO Box 260 3010, AUSTRALIA DK-4000 Roskilde, DENMARK Email: pjs(a)cs.mu.oz.au Email: henning(a)ruc.dk Tel: +613-8344-9155 Tel: +45 46 74 38 32 Fax: +613-9348-1184 = Programme Committee: Jose Alferes, Universidade Nova de Lisboa Francisco Bueno, Universidad Polytecnica de Madrid = Henning Christiansen, Roskilde University Sandro Etalle, University of Twente Francois Fages, INRIA Maurizio Gabbrielli, University of Bologna Maria Garcia de la Banda, Monash University Michael Gelfond, Texas Tech University Gopal Gupta, UT Dallas Katsumi Inoue, Kobe University Joxan Jaffar, National University of Singapore Gerda Janssens, K.U.Leuven Bharat Jayaraman, State University of New York at Buffalo Michael Leuschel, University of Southampton Michael Maher, Loyola University Chicago Dale Miller, The Pennsylvania State University = Ulf Nilsson, Linkoping University Francesca Rossi, Universita' di Padova Konstantinos Sagonas, Uppsala University Christian Schulte, Universitat des Saarlandes Harald Sondergaard, University of Melbourne Francesca Toni, Imperial College London Miroslaw Truszczynski, University of Kentucky Pascal Van Hentenryck, Brown University David S. Warren, State University of New York at Stony Brook = ACCEPTED PAPERS =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Reasoning with infinite stable models II: Disjunctive programs P.A. Bonatti A proof-theoretic foundation for tabled higher-order logic programming Brigitte Pientka Computing stable models: worst-case performance estimates Zbigniew Lonc and Miroslaw Truszczynski A rewriting method for Well-Founded Semantics with Explicit Negation Pedro Cabalar Trailing Analysis for HAL Tom Schrijvers, Maria Garcia de la Banda, Bart Demoen On Enabling the WAM with Region Support Henning Makholm and Kostis Sagonas Disjunctive Explanations Katsumi Inoue, Chiaki Sakama Efficient Real-Time Model Checking using Tabled Logic = Programming and Constraints Giridhar Pemmasani C.R. Ramakrishnan I.V. Ramakrishnan An Abductive Approach for Analysing Event-Based Requirements Specificatio= ns Alessandra Russo, Rob Miller, Bashar Nuseibeh, Jeff Kramer Embedding Defeasible Logic into Extended Logic Programs Grigoris Antoniou and Michael J. Maher A different look at garbage collection for the WAM Bart Demoen Reasoning about actions with CHRs and Finite Domain Constraints Michael Thielscher Propagation Completeness of Reactive Constraints Michael J. Maher Using hybrid concurrent constraint programming to model dynamic = biological systems Alexander Bockmayr and Arnaud Courtois A Polynomial Translation of Logic Programs with Nested Expressions = into Disjunctive Logic Programs: Preliminary Report David Pearce, Vladimir Sarsakov, Torsten Schaub, Hans Tompits, Stefan Wol= tran Logical Algorithms Harald Ganzinger and David McAllester A Model Theoretic Semantics for MLS Deductive Databases Hasan M. Jamil and Gillian Dobbie Proving the Equivalence of CLP Programs Sorin Craciunescu Access Control for Deductive Databases by Logic Programming Steve Barker A Purely Logical Account of Sequentiality in Proof Search Paola Bruscoli Logical Loops Joachim Schimpf Copying garbage collection for the WAM: to mark or not to mark ? Bart Demoen, Phuong-Lan Nguyen, Ruben Vandeginste Towards Local Search for Answer Sets Yannis Dimopoulos Andreas Sideris Tabulation for Stratified CLP and Infinite-State Model Checking for = Safe Branching Time Logic Witold Charatonik, Supratik Mukhopadhyay, and Andreas Podelski Learning in Logic with RichProlog Eric Martin, Phuong Nguyen, Arun Sharma, and Frank Stephan Using Logic Programming to Detect Activities in Pervasive Healthcare Henrik B=E6rbak Christensen Logic for Software Engineering: A Second Chance Kung-Kiu Lau, Michel Vanden Bossche A Logic-based System for Application Integration Tamas Benko, Peter Krauth, Peter Szeredi Towards a Declarative Query and Transformation Language for XML and = Semistructured Data: Simulation Unification Fran=E7ois Bry and Sebastian Schaffert ------- End of Blind-Carbon-Copy

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ANNOUNCE: HOpenGL 1.02 released
by Sven Panne 21 Apr '02

21 Apr '02

HOpenGL, a Haskell binding for OpenGL and GLUT version 1.02 I am pleased to announce the thirteenth release of the Haskell binding for GL 1.2.1 / GLU 1.3 / GLUT 3.7beta. It offers easy access to *the* industrial strength 3D graphics API and a GUI toolkit. More details about HOpenGL can be found at http://haskell.org/HOpenGL This is a mainly a compatibility release for >= GHC-5.x, including some minor extensions. What's new: * Added support for 3D textures: texImage3D, texSubImage3D, copyTexSubImage3D. * Added a "make install" target to add a HOpenGL package to GHC. This makes using HOpenGL much easier: A simple ghc -package HOpenGL --make MyCoolApp.hs is enough for most applications. * GLUT exports its own versions of System.exit{With,Failure} now to avoid GHC's problems of those functions if they were issued during callbacks. * Fixed quite a few library incompatibilities for GHC >= 5.02. * Fixed some minor GLU incompatibilities. * Fixed GLUT game mode exports, so you could actually use it now! :-} * Changed configure to detect the native (i.e. non-Mesa) OpenGL as the default. This is more conforming with the OpenGL ABI spec. * Re-animated --with-hc and --with-green-card configure flags. HOpenGL-1.02 has been tested on the following platforms: * ix86, SuSE Linux 7.3, Mesa 3.4.2, bleeding edge GHC from CVS * ix86, Windows 2000, Cygwin (DLL 1.3.10), NVIDIA DetonatorXP * drivers 28.32, GHC 5.02.3 and 5.03-20020204 * SPARC, Solaris 2.7, Mesa 4.0.2, GHC 5.02.3 It should work on any platform with a recent GHC, too. As always, feedback and/or patches are highly welcome. Have fun! Sven

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Re: HC&AR (May edition) - more suggestions
by C.Reinke 19 Apr '02

19 Apr '02

> Haskell Communities and Activities Report > http://www.haskell.org/communities/ > > The current plan is to get contributions in by the end of April, > and to get the collective report out early next month (*). I wrote "new suggestions are welcome". Several Haskellers have already contacted me about applications of Haskell (Haskell as a mere tool for someone's work or research) this week, and during these exchanges, two further interesting topics have emerged: 1. Tips, tricks & tutorials It seems that some Haskellers have documented their own hard-won experience to help others. They have been working on web pages, short papers, tours, and tutorials touching on introductory examples of monads&co, giving guided tours and explanations of prelude, libraries & syntax, or tips about programming and resource tuning, even explaining the internals of GHC (scary;), or interpreting Hugs error messages. If you have, or know about such a valuable resource, please send me a link and a brief description. Ultimately, all these things should be linked from the Haskell bookshelf (which is not limited to books:): http://haskell.cs.yale.edu/bookshelf/ but many resources are not yet linked in there (wasn't there some group of pragmatic programmers choosing Haskell as their language to be learned this year? And another group working on a new tutorial?), so we'll have a section on this in the next HC&A Report. 2. Haskell publication overview We already had a preview of the JFP special issue on Haskell last time, but we should make this a permanent section. So, if during the last 6 months, you've finished your Haskell-related thesis, or published your book, or if some Haskell-related conference proceedings have appeared, or you know about any other relevant publications during that period, please let me know. Btw, we don't have good coverage of Haskell research groups yet (apart from those who are covered by reports on their software releases). And if you know Haskellers who are on other lists, but don't read the main list here, please feel free to point them to the report's home page. I'm also trying to contact folks who have released software recently, but please don't wait for me to get round to you. Just send me an email if you're willing to contribute a brief report on your great new tool! Please keep those contact offers and summaries coming!-) Claus PS. I seem to have problems getting answers from some people I've contacted about the report. I hope I'm not in people's kill-files yet, or that I'm running into your anti-spam mechanisms?-) The emails don't bounce, and there's no vacation message either, so if you were expecting me to contact you personally, but haven't heard from me, could you please get in touch? Thanks.

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ANNOUNCE: FunGEn-0.1 released!
by Andre W B Furtado 19 Apr '02

19 Apr '02

----------------------- FunGEn Functional Game Engine ----------------------- I am pleased to announce the first release of FunGEn, a 2D platform-independent game engine implemented in and for Haskell, using HOpenGL. Actually, FunGEn supports: * Initialization, updating, removing, rendering and grouping routines for game objects; * Definition of a game background (or map), including texture-based maps and tile maps; * Reading and intepretation of the player's keyboard input; * Collision detection; * Time-based functions and pre-defined game actions; * Loading and displaying of 24-bit bitmap files; * Some debugging and game performance evaluation facilities; * Sound support (actually for windows platforms only... :-[ ) You can download and find more info about FunGEn in: http://www.cin.ufpe.br/~haskell/fungen Your feedback is highly welcome! Nice coding... -- Andre W B Furtado

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RE: Confused about seq and forms.
by Konst Sushenko 19 Apr '02

19 Apr '02

Jay Cox wrote: > > > Any referal to a paper describing the differences between HNF and WHNF > (yes, that includes yours Simon PJ!) would be appreciated. Actually, > I really, really want that reference to at least read that > bit about WHNF. I found "Functional Programming" by Field and Harrison (ISBN 0201192497) useful: An expression E is in HNF if: 1. E is a constant or a variable 2. E is an expression of the form \x_1.\x_2...\x_n.M, where expression M is not a redex, n > 0 3. E is of the form P E_1 E_2 ... E_n, where P is a function of arity k > n, n >= 0 and E is in WHNF if: 1. E is a constant or a variable 2. E is an expression of the form \x.M, for any sub-expression M 3. E is of the form P E_1 E_2 ... E_n, where P is a function of arity k > n, n >= 0 In other words, as I understand it, the difference between HNF and WHNF is that any lambda abstraction is in WHNF but only those lambda abstractions that have irreducible bodies are also in HNF. In all other respects WHNF and HNF are identical, that is, any variable and constant is in both WHNF and HNF, and any patially applied function is also in both forms. Any corrections are welcome! konst

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MDaemon Warning - Virus Found
by postmaster＠socrates.america-net.com.br 19 Apr '02

19 Apr '02

The following message had attachment(s) which contained the viruses: >From : postmaster(a)haskell.org To : haskell(a)haskell.org Subject : Undeliverable mail--"eager to see you" Date : Fri, 19 Apr 2002 01:07:42 -0300 Message-ID: Attachment Virus name Action taken ------------------------------------------------------------------------------ ��.scr I-Worm.Klez.h Removed

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