Haskell Weekly News: October 17, 2009

Submitted by jfredett on Fri, 10/16/2009 - 11:00pm.
Haskell Weekly News: October 17, 2009

Welcome to issue 136 of HWN, a newsletter covering developments in the Haskell community.

Over the last week, fpisfun from reddit announced a new subreddit for simple, direct applications of Haskell to common problems which normally might be solved by a perl script or bit of bash. There are a number of examples already there, and the numbers keep growing. It's not just command-line utilities either, there is also this post on calculating the bend needed for a bay window curtainrod. There is plenty of great material if you're new to Haskell and looking for some basic examples of different simple projects, examples of using monads and functors appropriately, or just want to see some 'real' programs in Haskell, it's worth a look!

Also, a small correction, due to some issues with the tools, unicode characters get replaced with their ASCII 'equivalents' so that an 'e' with an umlaut becomes an 'e' character. Thanks to Wolfram Kahl for pointing out that this change is not as innocent as I thought, apologies thusly to Guenther Schmidt (I'm told thats a better approximation of the correct spelling) for the error, I apologize in advance for any other similar errors. I'm working on improving the unicode support in the tools, but it's a nasty bug to catch.

This was a long editorial, so I won't take any more of your time, Haskellers, the Haskell Weekly News!


Call for Contributions - Haskell Communities and Activities Report, November 2009 edition. voigt called for contributions to the November 2009 issue of the Haskell Communities and Activities Report. See post for details.

Call for Participation: VSTTE 2009. Jean-Christophe Filliatre announced a call for participation for the VSTTE Workshop.

WFLP 2010 Call for papers. Pablo Nogueira announced a call for papers for the 2010 WFLP.

BAHUG Next meeting: October 21st at MIT (32G-882). Ravi Nanavati announced the next meeting of the Boston Area Haskell User's Group. Which will be in the CSAIL Reading Room at MIT. This editor hopes to actually make it to this one, so maybe I'll see you there!

fp-southwales, the South Wales Functional Programming User Group. Andy Gimblett announced the formation of fp-southwales, a user group for anybody interested in functional programming in the area of south Wales, UK.

The Monad.Reader (14) - Call for copy. Brent Yorgey announced the call for copy for the next issue of `The Monad.Reader`, Issue #14

Extensions to Vec uploaded (useful for GPipe programs). Tobias Bexelius announced two extensions to the Vec package: Vec-Transform and Vec-Boolean. Vec-Transform provides some 4x4 transform matrices such as perspective projection and rotation. Vec-Boolean provides Data.Boolan instances for the Vec data types.

Bindings to FFMpeg library. Vasyl Pasternak announced the next release of the hs-ffmpeg library. Downloadable from Hackage along with the ffmpeg-tutorials, which show capabilities of this library. The installation process is a bit tricky so Vasyl put up a blog post which describes the installation process.

Haskell Hackathon in Zurich, Switzerland. Johan Tibell announced a Hackathon in Zurich, to be held in March in the Google office. No concrete date has been decided, but if your interested, make sure to add your name here.

Reverse Dependencies in Hackage (demo). Roel van Dijk announced his patch to add reverse-dependencies to Hackage, see the linked post for information on where to see an example version of hackage.


Relational Algebra. Guenther Schmidt asked about whether or not a EDSL for relational algebra in Haskell.

GHC devs. Andrew Coppin asked about how many GHC Developers there are, and was somewhat surprised with the answer.

Fuzzy Logic / Linguistic Variables. Neal Alexander demonstrated an implementation of fuzzy logic taken from the book: 'Programming Game AI by Example' by Mat Buckland. In the book, the code was in C++, rewriting it in Haskell made for much more succint, readable code.

Graph Library Using Associated Types. Lajos Nagy asked about using Associated types in a Graph library.

Is proof by testing possible? Muad'Dib asked us Haskell Mentat's about whether it was possible to prove a function correct in a finite number of tests. The discussion brought forth not only answers but some /very cool/ results about the application of compactness (in the topological sense) to testing.

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

  • sproingie: How do you beta-reduce a problem like Maria
  • Baughn: There's also the language, Quine, whose interpreter is implemented as a symlink to /bin/cat
  • benmachine: [on the best editor] opinions vary. from correct opinions i.e. mine to other ones. [editor's comment: Obviously, this question is settled, the best editor is *garbled*]
  • pozic: statistics. a wonderful tool to control people.
  • FunctorSalad: I think the 'asks', 'gets' etc family of names is sort of cute, like the program is talking about itself in the third person
  • mmorrow:: Right, that's just beggin for a State monad.

About the Haskell Weekly News

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