Re: [Haskell-cafe] What is simplest extension language to implement?
Clojure! Sent from my iPad On Nov 2, 2010, at 2:31, Miguel Mitrofanov miguelim...@yandex.ru wrote: Ehm... Forth? TCL? Отправлено с iPhone Nov 2, 2010, в 9:04, Permjacov Evgeniy permea...@gmail.com написал(а): Let us think, that we need some scripting language for our pure haskell project and configure-compile-run is not a way. In such a case a reasonably simple, yet standartized and wide known language should be implemented. What such language may be? R(4/5/6)RS ? EcmaScript ? Some other ? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] fundata1 -- Karmic Social Capital Benchmark and Shootout
I am happy to announce fundata1 -- the largest-ever program per RAM allocation in Haskell, originally implemented in Clojure and then OCaml and Haskell for social network modeling. http://github.com/alexy/fundata1 It has now become the first large-scale social networking benchmark with a real dynamic social graph built from the actual Twitter gardenhose, with the data OK'd by Twitter and supplied along with the benchmark. I wrote three reference implementations, all on github as well. Clojure and OCaml are quite basic, while Haskell community had a chance to optimize its data structures and in fact fix a GC integer overflow while working on it. You're welcome to fork and improve all of these implementations, and supply others! There's a Google Group, http://groups.google.com/group/fundata/ to discuss the shootout. There's also a blog about it and other functional things at http://functional.tv/ Let the fun begin! -- Alexy Khrabrov firstname.lastnameATgmaildotcom ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: Configuring cabal install readline on Snow Leopard with MacPorts
OK -- I've managed to build it as follows. 1. Got the readline from the source at ftp.gnu.org. Always fun to ftp to the mothership, got the patches while at it. Always fun to remember where to cd to patch and which -p level to supply. 2. Built and installed readline 6.004 with default /usr/local prefix. 3. In the readline-1.0.1.0, manually ran ./configure --with-readline-includes=/usr/local/include --with-readline-libraries=/usr/local/lib 4. runghc Setup.hs build # no runghc Setup.hs configure, messes things right back! 5. sudo runghc Setup.hs install The only difference with cabal install is that (5) installs in /usr/local, but apparently subsequent cabal install modules which need readline finds it, even though installing in ~/.cabal/. I wonder if having multiple libreadline5.x.dylib and ...6... in /opt/local/lib, the residue from the previous MacPorts, some not deactivated, may confuse Cabal. In any case, installing things manually into /usr/local/ generally coexisted well with MacPorts for me, so this works for now. Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Configuring cabal install readline on Snow Leopard with MacPorts
I've tried to do cabal install readline on Snow Leopard with MacPorts and it fails with the infamous: $ cabal install readline ... checking for GNUreadline.framework... checking for readline... no checking for tputs in -lncurses... yes checking for readline in -lreadline... yes checking for rl_readline_version... yes checking for rl_begin_undo_group... no configure: error: readline not found, so this package cannot be built See `config.log' for more details. cabal: Error: some packages failed to install: readline-1.0.1.0 failed during the configure step. The exception was: exit: ExitFailure 1 Googilng shows the usual explanation that Mac'y broken clone interferes; yet I do have MacPorts and readline 6 there. So I try, per fixes recommended, $ cabal install readline --extra-include-dirs=/opt/local/include --extra-lib-dirs=/opt/local/lib ... checking for rl_readline_version... yes checking for rl_begin_undo_group... no ... -- same result. Downloaded the package and do configure manually: ./configure --with-readline-includes=/opt/local/include --with-readline-libraries=/opt/local/lib ... checking for readline in -lreadline... no checking for rl_readline_version... no ... Huh? $ port contents readline ... /opt/local/include/readline/readline.h ... /opt/local/lib/libreadline.5.0.dylib /opt/local/lib/libreadline.5.1.dylib /opt/local/lib/libreadline.5.2.dylib /opt/local/lib/libreadline.6.0.dylib /opt/local/lib/libreadline.6.dylib /opt/local/lib/libreadline.a /opt/local/lib/libreadline.dylib ... How should I properly tell cabal install readline where my readline is? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] where does ghc specify ar options
BTW, how did you get the package installed in that location? Did it involve copying into a temp dir and copying again? I believe that on OSX, copying a .a file breaks the ar index. This is because for reasons best known to themselves Apple decided that the index is only valid if its timestamp is the same as the last modification time of the file. OK -- what I did was rather drastic -- I got ar as a part of cctools off Apple's Open Source and verified that it didn't run ranlib on my Leopard 10.5. However it turns out it's supposed to do so -- folks from MacPorts even got a flag -S to make it *not* tun ranlib... Yet they're on PPC, and I'm on Intel (MBP). So what I ended up doing is patching Apple's ar as described in that MacPorts thread: Why ar doesn't call ranlib on Mac? And after that, cabal-install did bootstrap.sh like a charm. I know some folks say that they don't need to run ranlib on their Macs, and some do, and I could have wrapped it in sh-wrappers and investigate it forever, but this issue has re-ar-ed its head often enough that I'm happy with just fetching the li'l slimy ar out of its source soup and fixing it in the bud. Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] where does ghc specify ar options
When bootstrapping cabal-install 0.6.2 on Mac OSX Leopard (Intel), I get a problem when linking: Linking dist/build/cabal/cabal ... ld: in /private/var/folders/mw/mwJSf7ErEa4w8nWyKyyqDTY/-Tmp-/zlib-0.5.0.0/dist/build/libHSzlib-0.5.0.0.a, archive has no table of contents This had happened with other ar'chives on my Mac before where it hadn't for some others. In all cases the fix was to make sure ranlib is run on the archive in question, or s is passed to ar during the creation. I have the latest XCode 312m gcc build 5490, and ghc 6.10.1 from MacPorts. In order to ensure ar cr becomes ar crs, I need to find out where in the ghc build process is it known how to create .a files? Where can an ar cr be changed to ar crs on a system-wide ghc build basis? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Boost equivalent
One of the great strengths of Python is Boost.Python. Practitioners say it's a major advantage of Python over Ruby, for example. So the question is not whether there's a Boost in Haskell -- C++ and Haskell are too different for it to have much meaning -- but whether there's or going to be a Boost.Haskell? Cheers, Alexy On Feb 1, 2007, at 5:03 AM, John Ky wrote: Does the Haskell community have an equivalent to C++ community's Boost project with the aim of writing libraries for the eventual inclusion into Haskell? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell Cookbook?
On 1/30/07, Donald Bruce Stewart [EMAIL PROTECTED] wrote: That reminds me, there's lots of very nice code on Haskell paste, http://hpaste.org/ You could dump a lot of that into a cookbook, almost. Thanks for the link, lovely, but very linear -- and not classified, and not browseable even. I clicked a bit until my mouse got tired and there was only 5d age on display. How about dumping this whole codebase into a search engine such as Lucene? Is it available in more useful form for browsing/study? (Even a tarball form will be fine...) Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell Cookbook?
Also see that sequence.complete.org has many code snippets in the blog section. What would be a good way to systematize all such snippets together with hpaste.org and those scrolling through the mailing list? Perhaps some kind of ontology of snippets like the table of contents of a cookbook? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Is Excel the most used -- and fucntional -- programming lanuage on Earth?
Heard that statement recently -- that Excel is a functional programming language, and the most used one -- of any programming languages -- on Earth! Is it true? Are there good examples of typical FP style in Excel? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Haskell Cookbook?
So I'm picking up Haskell bit by bit, and I found the code examples transpiring here most useful. Reflecting why it's harder to pick up Haskell than say Ruby or Python, here's what I found -- those languages deal with a typical domain available to any programmer -- his own computer/system/shell. The artifacts are files, directories, timestamps, etc. The stuff every programmer understands in their sleep. APIs. So I loved the shell-script beautification thread. That's how I learn about new modules and their functions -- as use cases. I also found some pieces of Haskell strewn around people's websites, blogs, forums; even at paste.lisp.org. I'm gathering them for my own purpose and trying to compile and run them. Wouldn't it be nice -- in case it doesn't exist already -- a[n O'Reilly[-like]] Haskell Cookbook? That would be the best way to learn Haskell. I've found a wikibook on Haskell, but I look for a big bag of small, self-contained programs. Perhaps you esteemed veterans can dig your small scripts and paste them into a wiki? Examples needed -- how to connect to a database; to a web service (e.g. Amazon); read a csv file; represent data equivalent to a directory listing; a text file/XML; etc... Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] State of OOP in Haskell
And OOHaskell didn't compile for me on GHC 6.6... tells you about currency of use. On 1/28/07, Lennart Augustsson [EMAIL PROTECTED] wrote: OOHaskell is ingenious, but it's a terrible way to use Haskell. It's very unidiomatic Haskell, and it makes you do things in the same old OO way. Presumably people are using Haskell to do things differently? But as I said, I consider OOHaskell itself a work of genius. :) -- Lennart On Jan 27, 2007, at 22:24 , Alexy Khrabrov wrote: What about this OOHaskell: http://homepages.cwi.nl/~ralf/OOHaskell/ -- how is it received in the café? :) Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] How did you stumble on Haskell?
How do people stumble on Haskell? I've taught ML at UPenn, and many of my colleagues in Amazon are in SeaFunc -- switching from C funk to func funk. I've got Hudak's book a while ago, but didn't have time/excuse to delve into it until recently. Then the most fantastic chain if events triggered it: -- finally switched to Intel Mac -- got Parallels -- got a recent Linux, openSUSE 10.2, to stick into Parallels -- decided finally to try Gentoo -- found equery slow, came across Adelie/FQuery as fast equery -- emerge adelie To my surprise, saw it emerge GHC! Realized Adelie is a Haskell way to hack Portage. Dug all things Haskell! I also used Darcs for a long time. It probably takes several pro et contra factors to push away from boring things and to be inducted into interesting FP things. Again, UPenn focus on ML was invaluable, and Ullman's book on ML superb -- and thin! What's folks most interesting ways to arrive at FP? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] State of OOP in Haskell
Well, I'm thinking in terms of OOD/OOA/OOP -- Design, Architecture, Programming. That's about the only way to model a bog system. Say I have a stock market model -- I'll have a database of tickers, a simulator to backtest things, a trading strategy, etc. Do Haskell modules provide enough encapsulation to design a system in terms of them? What are the design/architecture units in Haskell if not OO-based? Cheers, Alexy On 1/27/07, Donald Bruce Stewart [EMAIL PROTECTED] wrote: deliverable: ...In the tradition of the letters of an ignorant newbie... What's the consensus on the OOP in Haskell *now*? There're some libraries such as OOHaskell, O'Haskell, and Haskell~98's own qualified type system with inheritance. If I have GHC, which way to do anything OOP-like is considered right today? Using existentials and typeclasses to do some OO things wouldn't be considered unidiomatic (particularly, using existentials to package up interfaces to values). In general though, using a functional approach will produce better (simpler) Haskell code, and make it more likely others will understand it. Personally, I run in fear from OO Haskell ;) Concrete examples of when you think you need an OO feature might be useful, so people can discuss the more FP solutions to the same problem. Cheers, Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] State of OOP in Haskell
...In the tradition of the letters of an ignorant newbie... What's the consensus on the OOP in Haskell *now*? There're some libraries such as OOHaskell, O'Haskell, and Haskell~98's own qualified type system with inheritance. If I have GHC, which way to do anything OOP-like is considered right today? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] State of OOP in Haskell
What about this OOHaskell: http://homepages.cwi.nl/~ralf/OOHaskell/ -- how is it received in the café? :) Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Concurrency in Haskell
Well, I'm a bit suspicious if the top references on Haskell concurrency are either research papers or compiler manual sections. How about some good ol' bundles of them codes to peruse and take example from? E.g., dining philosophers? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Concurrency in Haskell
What's the state of concurrency in Haskell? If Erlang's main strength is light-weight parallelism, can something like that be done in Haskell? Are there good examples of useful code employing GHC concurrency features one can play with? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Strings in Haskell
I wonder if that's another reason OCaml is used in a(t least one) hedge fund -- why Jane St. preferred OCaml to Haskell, I wonder? Was it the state of affairs then that OCaml was more efficient (? -- WAGuess), and would they prefer Haskell now? I'm trying to make sense out of OCaml objects out of that already infamously annoying Practical OCaml book, and class object blah... doesn't look like much, not to say that class object sounds about as bad as most English in that book. (Written by an English major... What a decline in US education! :) I come from ML background, so Haskell laziness and OCaml objects are all new to me. But my Haskell book, Haskell School of Expression, is so much better written, that I'm reading it much faster. I'm CC'ing Yaron as his e-mail comes up in my Gmail context adwords on the word Haskell. :) I'm interested in financial data mining and market modeling -- are there any good application of FP there, say in Lisp? Cheers, Alexy P.S. Somebody with an old-fashioned mail client please feel free to change the subject to Financial Engineering with FP, gmail seems to etch its subjects in stone. :) On 1/23/07, Martin Jambon [EMAIL PROTECTED] wrote: On Mon, 22 Jan 2007, Alexy Khrabrov wrote: Greetings -- I'm looking at several FP languages for data mining, and was annoyed to learn that Erlang represents each character as 8 BYTES in a string which is just a list of characters. Now I'm reading a Haskell book which states the same. Is there a more efficient Haskell string-handling method? Which functional language is the most suitable for text processing? In OCaml, strings are compact sequences of bytes. And you can pass them as-is to C functions: http://caml.inria.fr/pub/ml-archives/caml-list/2002/08/e109df224ff0150b302033e2002dbf87.en.html Martin -- Martin Jambon http://martin.jambon.free.fr ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Strings in Haskell
On 1/23/07, Bryan O'Sullivan [EMAIL PROTECTED] wrote: generate financial models for execution by clusters running Excel. There used to be, on Slashdot, a saying: Now imagine a Beowulf cluster of these! :) Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Strings in Haskell
Greetings -- I'm looking at several FP languages for data mining, and was annoyed to learn that Erlang represents each character as 8 BYTES in a string which is just a list of characters. Now I'm reading a Haskell book which states the same. Is there a more efficient Haskell string-handling method? Which functional language is the most suitable for text processing? Cheers, Alexy ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
