July 2010 - Haskell-Cafe

Multidimensional Matrices in Haskell
by Mihai Maruseac 12 Jul '10

12 Jul '10

Hi, A friend of mine wanted to do some Cellular Automata experiments in Haskell and was asking me what packages/libraries are there for multidimensional matrices. I'm interested in both immutable and mutable ones but I don't want them to be trapped inside a monad of any kind. Any hints? -- MM

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EnumMap 0.0.2 and Containers-0.3
by Max Cantor 11 Jul '10

11 Jul '10

Is there a reason that EnumMap specifically requires containers < 0.3 or just a matter of not having been tested? It seems to compile just fine (but with one warning for a deprecated call). Max

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ANNOUNCE: UMM-0.3.0
by Uwe Hollerbach 11 Jul '10

11 Jul '10

Hi, all, I've just uploaded version 0.3.0 of umm, my small money-manager program, to hackage. This version does nicer plotting of data than before (depends on gnuplot). Have a look if you... errr... like money :-) regards, Uwe

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HaskellWiki spam
by Henk-Jan van Tuyl 11 Jul '10

11 Jul '10

L.S., There are hundreds of HaskellWiki users created, their names all start with "Buy" and their user pages contain spam. I suppose the antispam measures were reverted when a backup of the site was loaded. (B.T.W. the site still displays the old logo.) Regards, Henk-Jan van Tuyl -- http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html --

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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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