Haskell Weekly News: September 12, 2009

Submitted by byorgey on Sat, 09/12/2009 - 11:24am.
Haskell Weekly News: September 12, 2009

Welcome to issue 130 of HWN, a newsletter covering developments in the Haskell community.

Welcome to issue 130 of HWN! In the last week, HWN has gotten a new editor, me! I'm Joe Fredette (jfredett on IRC, reddit, and everywhere else), and I'll be taking over for Brent (byorgey) from now on. I think I speak for the whole community when I thank him for his excellent work on the HWN and associated tools. I have a few ideas about how I want to change HWN for the better, and hopefully you'll like them too! So, without further ado, The Haskell Weekly News!


Looking for a new HWN editor. Brent Yorgey went looking for a new editor for the HWN, and that's how you got me! See the editorial for more details.

CfPart: FMICS 2009, 2-3 November 2009. Christophe Joubert announced FMICS 2009 - FIRST CALL FOR PARTICIPATION, 14th International Workshop on Formal Methods for Industrial Critical Systems. November 2-3, 2009

Call for Posters: APLAS 2009. Kiminori Matsuzaki announced a CALL FOR POSTER PRESENTATIONS The Seventh ASIAN Symposium on Programming Languages and Systems (APLAS 2009) December 14 - 16, 2009 Seoul National University, Seoul, Korea.

hecc-0.1. Marcel Fourné announced the first release of hecc, the Elliptic Curve Cryptography Library for Haskell. Implemented are affine, projective, jacobian and modified jacobian point formats with the basic operations. Included as an Example is a basic ECDH as well as a basic speed test.

HLint 1.6.8. Neil Mitchell announced HLint 1.6.8. HLint is a tool for suggesting improvements to your source code. It suggests the use of library functions you may have been unaware of, finds patterns of recursion that are really folds/maps, hints about extensions you aren't using and much more. HLint is now one of the top 20 applications on Hackage, and is used by the darcs project to improve and statically check their code base.

A Levenberg-Marquardt implementation. Bas van Dijk announced the release of a Haskell binding to Manolis Lourakis's C levmar library. This library implements the Levenberg-Marquardt algorithm which is an iterative technique that finds a local minimum of a function that is expressed as the sum of squares of nonlinear functions. It has become a standard technique for nonlinear least-squares problems and can be thought of as a combination of steepest descent and the Gauss-Newton method.

CCA-0.1. Paul L announced that a library for Causal Commutative Arrows (CCA) has been uploaded to Hackage DB. It implements CCA normalization using Template Haskell and a modified arrow pre-processor (based on arrowp) to generate outout that Template Haskell can parse. It's highly experimental since we are still fiddling with several design choices, and by no means we imply Template Haskell is the best choice to implement CCA. Any suggestion or comment is welcome!

graphviz-2999.5.0.0. Ivan Lazar Miljenovic announced version 2999.5.0.0 of the graphviz package for Haskell. This is what I like to think of as the 'Hey, this is almost getting to be a decent library!' version. The graphviz package provides bindings to the GraphViz suite of programs by providing the ability to generate and parse GraphViz's Dot language as well as wrappers around the tools themselves.

uvector-algorithms 0.2. Dan Doel announced version 0.2 of the uvector-algorithms package. The package so far has implementations of several sorting and selection algorithms for use on the mutable arrays from the uvector library, as well as combinators for applying them to immutable arrays.

dbmigrations 0.1. Jonathan Daugherty announced dbmigrations, A library and program for the creation, management, and installation of schema updates (called migrations) for a relational database. In particular, this package lets the migration author express explicit dependencies between migrations and the management tool automatically installs or reverts migrations accordingly, using transactions for safety. This package is written to support any HDBC-supported database, although at present only PostgreSQL is fully supported.

Palindromes 0.1. Johan Jeuring announced Palindromes, a package for finding palindromes in files. Visit the homepage The primary features of Palindromes include: A linear-time algorithm for finding exact palindromes, A linear-time algorithm for finding text palindromes, ignoring spaces, case of characters, and punctuation symbols.


Averting QuickCheck Madness. Christopher Lane Hinson Christopher Hinson asked about best practices with regards to QuickCheck, and it's inclusion/exclusion as a dependency for end-user programs.

How to customize dyre recompile? Andy Stewart Andy Stewart asked about how to customize Dyre's settings to do a whole-program recompilation.

Externally derive instance of Data? Dimitry Golubovsky Dimitry Golubovsky asked about stand-alone deriving for third-party datatypes.

Parallel parsing & multicore. Anakim Border Anakim Border talked about parallel parsing, specifically about a parser he had put together, which led to a discussion of Edward Kmett's recent talks at BAHUG.

Ph.D position, Utrecht University, the Netherlands. S.Doaitse announced Vacancy PhD student on Realizing Optimal Sharing in the Functional Language Implementations Utrecht University, The Netherlands.

Blog noise

Haskell news from the blogosphere. Blog posts from people new to the Haskell community are marked with >>>, be sure to welcome them!

Quotes of the Week

  • lispy: All haskell lists have less than 400 elements
  • Jafet: The C preprocessor is purely dysfunctional
  • edwardk: so the -> is matched on the outside, but the -> and , fail to match on the inside, unification fails, dogs and cats start living together in harmony, general chaos.
  • yaxu: [about lambdabot] an irc bot that no-one understands the workings of has to be a fine precursor to artificial intelligence
  • Gracenotes: all in all, you're just another brick in the -Wall

About the Haskell Weekly News

New editions are posted to the Haskell mailing list as well as to the Haskell Sequence and Planet Haskell. RSS is also available, and headlines appear on haskell.org.

To help create new editions of this newsletter, please see the information on how to contribute. Send stories to jfredett . at . gmail . dot . com. The darcs repository is available at darcs get http://code.haskell.org/~byorgey/code/hwn/ .