- Haskell-Cafe - Haskell.org

hs-dotnet with Mono?
by Daniel Cook 11 Jul '10

11 Jul '10

Hi, Has anyone used hs-dotnet (http://haskell.forkio.com/dotnet/) with Mono on Linux? Cheers, - Dan

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Mapping a Texture in OpenGL?
by Hector Guilarte 11 Jul '10

11 Jul '10

Hello, I already send this to the HOpenGL list, but I'm kind of in a hurry with this and I'll probabbly get more responses from you... I've been looking for a way to map a texture into a Quad primitive with HOpenGL with no luck. I've already done this in C++ and had no problem. I did the tutorial in http://www.haskell.org/~pairwise/HOpenGL/HOpenGL.html, downloaded the sources, compiled them and it worked great (After changing a 2 lines to make it work with OpenGL's latest version), but when I change the code to use a .rgb file created by me with the program they provide from a .png file of 256x256 pixels I don't have the same luck... My OpenGL version is 2.4.0.1... I'm REALLY lost, clueless, so any kind of help would be greatly appreciated. I checked the textures in the examples of the red book, but they are "procedural" textures, and I need to map an image. One of the pictures I need to map is in http://dl.dropbox.com/u/1476919/Orange256.png Are six like that one and are for making a Rubik's Cube. After I finish it I'll upload it to hackage and let you all know. Thanks a lot, Héctor Guilarte

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Re: [Haskell-cafe] Re: lhs2TeX - lhs2TeX.fmt missing
by Tillmann Rendel 11 Jul '10

11 Jul '10

Hi Ivan, (why are you answering off-list?) Ivan Miljenovic wrote: > I was under the impression that with cweb, you can have one function > definition split into two, with another completely different block of > code in between them. I agree, that's something literate haskell can not do. (But it's different from what you wrote before). Tillmann

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Haskellers in Cleveland
by Jason Felice 11 Jul '10

11 Jul '10

I've just started a Cleveland Haskellers meetup, and for some reason I haven't thought to ask on this list yet. If there's anybody from the Greater Cleveland, OH area who is interested, please sign up! I hope to keep it small and informal. I've had good luck keeping it small so far. There's a meetup next Saturday, in fact. http://www.meetup.com/cle-haskell/ Thanks, -Jason

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new haskell project (Was Re: [Haskell-cafe] Subtype polymorphism in Haskell)
by Simon Courtenage 10 Jul '10

10 Jul '10

Hi, Just to add some details about the project I'm working on in case anyone is interested. The project is called Quanthas and is being hosted on sourceforge at http://sourceforge.net/projects/quanthas/. The aim of the project is to produce a Haskell implementation of Quantlib ( http://sourceforge.net/projects/quantlib/)- an open source library for quantitative finance written in C++. Haskell is starting to be used seriously in quantitative finance and risk modelling circles within the investment banking and finance community, so I thought there would be some value in producing such a version. If anyone is interested in helping out, we would be more than happy to hear from you, since the project has just started and there's a great deal to do (and learn!). Best regards Simon Courtenage On Tue, Jul 6, 2010 at 2:32 PM, Yitzchak Gale <gale(a)sefer.org> wrote: > Hi Simon, > > Did you intentionally not reply to the list? > > Simon Courtenage wrote: > > This is for a project to port an open-source C++ library to haskell. > > Great! We'd love to give you whatever support you need > for your efforts. > > > My initial plan is to more or less preserve the way the > > library works in the first draft of the port and see how > > far we can get like that > > That's fine, as long as you truly mean the way it works, > and not the way the code is structured. Haskell is a post-OO > language. Its abstractions are very different than class > structures in C++. There is no direct translation - any given > C++ class structure could correspond to many totally different > kinds of Haskell programs, depending on what the program > is trying to do. > > If you are trying to find a method to transliterate a strongly > OO-style C++ program more or less word for word into > Haskell in a way that the class structure of the C++ will > still be apparent in the result, you are likely in for a frustrating > experience. You will spend a lot more time than you expected, > and the results will be very unsatisfying. Many others have > ended up that way. > > On the other hand, if you are willing to be a little more flexible > in your thinking, you'll probably find the task much easier than > you thought, enjoy it, and reap many benefits from the process > that you never imagined. > > In any case, please keep us in the loop, we'd like to hear > how it's going. And, uh... would you be willing to share a > few more details about what it is that you're trying to port? ;) > > Thanks, > Yitz >

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building ghc-6.12.3 from source on Open Solaris
by Günther Schmidt 10 Jul '10

10 Jul '10

Hi, does anyone here have experience what it takes to build ghc-6.12.3 from source on Open Solaris, with binary ghc-6.12.1 installed? Günther

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ANN: HaRe-0.6, now on Hackage
by Chris BROWN 10 Jul '10

10 Jul '10

Dear Haskellers, As part of our project on Refactoring Functional Programs http://www.cs.kent.ac.uk/projects/refactor-fp/ we are pleased to announce the availability of HaRe 0.6 on Hackage. http://hackage.haskell.org/package/HaRe-0.6 Please see the README.txt for build/use instructions and known issues, and let us know about any problems, bugs, suggestions or additional platforms you can confirm as working. Happy Refactoring! The HaRe Team (Chris Brown, Huiqing Li, Simon Thompson) Background: Refactoring is the process of changing the structure of programs without changing their functionality, i.e., refactorings are meaning-preserving program transformations that implement design changes. For more details about refactoring, about our project and for background on HaRe, see our project pages. HaRe - the Haskell Refactorer: HaRe is our prototype tool supporting a collection of refactorings for Haskell 98 (see README.txt for known issues and limitations). It is implemented as a separate refactoring engine (on top of Programatica's Haskell frontend and Strafunski's generic traversal strategy library), with small scripting frontends that call this engine from either Vim or Emacs.

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Transformers versus monadLib versus...
by Gregory Crosswhite 10 Jul '10

10 Jul '10

Hey everyone, What is the current state regarding transformers versus monadLib versus mmtl versus ... etc.? Transformers seems to be the "blessed" replacement for mtl, so when is it worthwhile to use the other libraries instead? It hadn't even occurred to me to look closely at packages other than transformers for this purpose until I read a message earlier today from someone who said that he uses monadLib whenever he needs to use monad transformers, and it has now made me curious about them. Cheers, Greg

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Memoization in Haskell?
by Angel de Vicente 10 Jul '10

10 Jul '10

Hi, I'm going through the first chapters of the Real World Haskell book, so I'm still a complete newbie, but today I was hoping I could solve the following function in Haskell, for large numbers (n > 108) f(n) = max(n,f(n/2)+f(n/3)+f(n/4)) I've seen examples of memoization in Haskell to solve fibonacci numbers, which involved computing (lazily) all the fibonacci numbers up to the required n. But in this case, for a given n, we only need to compute very few intermediate results. How could one go about solving this efficiently with Haskell? Thanks in advance, Ángel de Vicente -- http://www.iac.es/galeria/angelv/ High Performance Computing Support PostDoc Instituto de Astrofísica de Canarias --------------------------------------------------------------------------------------------- ADVERTENCIA: Sobre la privacidad y cumplimiento de la Ley de Protección de Datos, acceda a http://www.iac.es/disclaimer.php WARNING: For more information on privacy and fulfilment of the Law concerning the Protection of Data, consult http://www.iac.es/disclaimer.php?lang=en

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Fix plugins package.
by Andy Stewart 10 Jul '10

10 Jul '10

Hi all, I want to use *plugins* package (http://hackage.haskell.org/package/plugins-1.4.1) Unfortunately, it looks broken. Anybody can fix it? Thanks, -- Andy

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