October 2010 - Haskell-Cafe

RE: [Haskell-cafe] Candlestick charts
by Vivian McPhail 01 Oct '10

01 Oct '10

Hi >Message-ID: <AANLkTinROzNiqF4+yKxOfHo0FB=3B_7tfduX=vVbggYC(a)mail.gmail.com> > >Hi - > >What are the libraries to use in Haskell to generate a stock >candlestick chart like >http://stockcharts.com/h-sc/ui?s=SPY&p=D&b=5&g=5&id=p05007254056<http://stockcharts.com/h-sc/ui?s=SPY&p=D&b=5&g=5&id=p05007254056> > >I will use Finance-Quote-Yahoo to get the quote data from Yahoo. > >thanks for all your help. The plot 0.1.1 package supports candle and whisker charts. http://hackage.haskell.org/plot Vivian

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ANN: contstuff: CPS-based monad transformers
by Ertugrul Soeylemez 01 Oct '10

01 Oct '10

Hello fellow Haskellers, (after failing (again) to send to the haskell list, I'm posting this here. I've contacted the mailing list owner about this.) I'm announcing the 0.4.0 release of the 'contstuff' monad transformer library, an alternative to libraries like 'mtl', 'transformers' and 'monadLib': http://hackage.haskell.org/package/contstuff The difference is that contstuff makes heavy use of continuation passing style both to increase performance and to make certain control flow patterns more accessible, including abortion, accumulation of multiple results, etc. On the wiki there is a quickstart introduction to those of you, who are familiar with monad transformers in general: http://haskell.org/haskellwiki/Contstuff Feedback, positive as well as negative, is highly appreciated. Thank you. Greets, Ertugrul -- nightmare = unsafePerformIO (getWrongWife >>= sex) http://ertes.de/

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ANNOUNCE: atomo 0.1, a simple, adventurous programming language
by Alex Suraci 01 Oct '10

01 Oct '10

Over the past few months I've been designing and implementing a new language called Atomo. The idea is to build up a very expressive language from as few parts as possible, akin to Io or Scheme. But first, the fundamentals: prototype-based object-orientation with multiple dispatch and pattern-matching. Still here? Great! Being object-oriented and dynamic, I expect a few boos and hisses, but if you want to dive in, it's a lot of fun. :) An immense amount of progress has been made in a short amount of time. It already sports a powerful documentation system (similar to Racket's Scribble), and a package manager is in the works (it's functional, but it's local-only). For a while I had atomo-lang.org serving up a site powered by Atomo itself, with Snap underneath via Atomo's Haskell interface. It's down at the moment (it was wrestling with darcsden over my VPS's resources), but the docs are always available: Documentation: http://atomo-lang.org/docs/ (work-in-progress) Repository: http://darcsden.com/alex/atomo Examples: http://darcsden.com/alex/atomo/browse/examples I recommend the generators example if you want some mind-bending, or html.atomo for a nice EDSL, or web.(atomo|hs) for an example of Haskell interop. On Hackage: http://hackage.haskell.org/package/atomo Installation: `cabal install atomo` should "just work", though I haven't worked out the appropriate version numbers for all of its dependencies yet. Hackage shows a build failure, but that seems to be caused by Haddock; I still haven't figured that out. If you want to get involved, you can find me on freenode in #atomo (and #haskell); my nick is alexsuraci. Or, you can fork the repository on darcsden. I'd just like to put this out there to see if anyone else is interested in playing with this. -- Alex

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