The community Trac hosting server isn't sending email, which Trac requires.
I've submitted several tickets to supp...@community.haskell.org but
gotten no response.
Does anyone maintain that server anymore?
Justin
___
Haskell-Cafe mailing list
Haskell-
at 5:56 PM, Antoine Latter wrote:
> Hi Justin, this message might be better on the haskell-cafe list (or
> the excellent beginers list!).
>
> When you tried to write the get/put implementations, what problems
> were you running into?
>
> Antoine
>
> On Sat, Jun 25,
On Mon, Oct 11, 2010 at 7:56 AM, Christopher Done
wrote:
> Hey that's cool, I hadn't seen that. This'll reduce my code
> significantly, especially mkFieldWithName. Cheers!
>
I'm not sure if it supports the "parameterization" of records that you
detailed in your post - let me know how it works for
No immediate plans but thanks for pointing that out - I hadn't seen it
yet. Similar functionality exists in the haskelldb-th package, without
the special type operators.
On Fri, Oct 8, 2010 at 5:19 PM, Bas van Dijk wrote:
> Great work!
>
> I think I'm going to use it.
>
> Any plan on packaging up
What is it?
The HaskellDB library lets you generate SQL queries without writing
any actual SQL. Unlike other query generating libraries, you choose
the abstraction level. Queries can be built out of independent
fragments, just like your programs. Leave hand-written, string-based,
SQL libr
You can find teh BASIC module on hackage:
http://hackage.haskell.org/package/BASIC
Download .tar.gz file and you can see the source.
On Mon, Nov 16, 2009 at 3:16 AM, CK Kashyap wrote:
> Thanks Don,
>
> I read the PDF. I was not able to figure out how to get the BASIC module.
> Wanted to see a
I'd recommend sending HaskellDB questions to the haskelldb users
mailing list. You do need to subscribe first. Now to your question:
On Sat, Oct 31, 2009 at 2:38 AM, R. Emre Başar wrote:
> Hi all,
> project (Server.name << s!Server.name #
> Vendor.name << v!Vendor.name #
> Model.n
These woudl be much more useful if they flushed the output handle
after each message. Then you know your trace messages will be
displayed/written to a file.
On Mon, Oct 19, 2009 at 1:51 PM, Thomas Hartman wrote:
> I have this and a couple other handy functions in
>
> DebugTraceHelpers:
>
> http:/
On Wed, Sep 30, 2009 at 7:54 AM, Robert Wills wrote:
> fwiw I found it difficult getting a Haskell installation onto Windows.
> Packages that would 'cabal install' just fine on Linux were much more of a
> pain on Windows. Eventually, I actually found it easiest to cross compile
> to Windows usin
On Sun, Sep 27, 2009 at 12:50 PM, Paul Moore wrote:
> The problem is that I have *no idea* how to begin debugging this. In
> C, Python, or any other imperative language, I'd put traces in, etc.
> But in Haskell, I don't even know where to start.
>
One of the standard modules is Debug.Trace modul
Gunther,
I've got a little experience with HList - read below.
2009/9/6 Günther Schmidt :
> Hi,
>
> I keep accumulating values and right now use plain tuples for that. I end up
> with a 12 element tuple and things are a bit messy.
>
> I'd like to use extensible Records from HList instead, thing i
Joachim,
I am maintaing the haskelldb package and it is definitely alive and well. I
don't have a Debian install to test on, but I am glad to help get things
compiling. See my detailed answers below:
On Mon, Sep 7, 2009 at 11:04 AM, Joachim Breitner wrote:
>
> * Are the haskelldb-hsql-* and has
I like it. git branches are nice to work with, and they don't the
conceptual pain of "creating" an new repository.
Things that make them nice:
* When switching branches, all your files magically update (if they
have not been modified).
* Easy to maintain multiple branches, say "stable" and
"e
System.Console.Curses? Sorry couldn't resist ...
On Fri, Jul 17, 2009 at 12:18 PM, Don Stewart wrote:
> dmehrtash:
>> Why do Haskell programmers (and libraries) name their function like "<@<" or
>> "#
>> ##"? Why not use a more descriptive label for functions?
>
> Where are those functions def
Anyone have thoughts to share? I'd love to read others' experiences
but there isn't much coming up with searches or on redditt ...
I was happiest with the VM I implemented. Sadly, I wasn't able to
solve any of the scenarios, but my VM ran damn fast. That didn't seem
to matter so much this year as
I bet they have PHP on the server already. Write your program so it
takes input from standard in and writes to standard out. Then just
run your executable from PHP and write to its pipe. Instant web
service!
On Fri, Jun 5, 2009 at 8:18 AM, Conor McBride wrote:
> Comrades
>
> I'm in a perplexing s
Try this:
http://www.connectionstrings.com/
On Fri, May 29, 2009 at 8:01 PM, Michael P Mossey
wrote:
> I'm trying to use Database.HDBC.ODBC to connect to a MySQL server, and I
> cannot figure out the docs. I want to establish a connection, and I know the
> server url, username, and password. A
Thanks for sharing your code and experience. Very interesting and a
good example of how to put the libraries together to build a real app.
On Mon, May 4, 2009 at 12:45 AM, Chris Forno wrote:
> I decided to find out for myself. You can find the results at
> http://jekor.com/article/is-haskell-a-go
How does this compare to WiX? I haven't looked at the docs yet ...
On Sat, Apr 25, 2009 at 4:59 PM, Sigbjorn Finne
wrote:
> Hi,
>
> a new version of Bamse has been uploaded to hackage,
>
> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bamse
>
> Bamse is a package and application for
I suspect it was never written. They "reference" that paper as one yet
to be written.
On Fri, Apr 10, 2009 at 10:15 AM, GüŸnther Schmidt wrote:
> Hi Shan,
>
> thanks but the paper I'm looking for is actually the reference #13 from the
> document you're pointing me to.
>
> Günther
>
>
>
> Chung-ch
On Sat, Feb 14, 2009 at 2:43 AM, Felipe Lessa wrote:
> Hello!
>
> There was a new HaskellDB release, but I didn't see any announcement
> here. Is it back alive? What happened to 0.11?
>
0.11 existed in the repository but was never uploaded to Hackage. I
updated the HDBC backends and rolled the ve
It's not a tutorial but it covers all the relvant portions you asked
about. Download the package, unzip it and you'll find my "Haskell
Cheat Sheet" PDF inside:
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/CheatSheet
On Mon, Feb 2, 2009 at 6:35 AM, Emil Axelsson wrote:
> Hello,
>
I have run into a weird bug with HDBC-odbc that only occurs on my unix
system. When I execute a select which returns more than 435 rows twice
in the same process, the second execution fails with this error
message:
SQL error: SqlError {seState = "[\"HYT00\"]", seNativeError = -1,
seErrorMsg = "co
I have run into a weird bug with HDBC-odbc that only occurs on my unix
system. When I execute a select which returns more than 435 rows twice
in the same process, the second execution fails with this error
message:
SQL error: SqlError {seState = "[\"HYT00\"]", seNativeError = -1,
seErrorMsg = "c
I've been following this instructions at
http://www.haskell.org/haskellwiki/Calling_Haskell_from_C to build a
Haskell library which I can call from a C program. I'd like to use
cabal to do the build in the future.
Are there any examples showing how to do it?
___
On Wed, Nov 19, 2008 at 11:50 AM, Warren Harris
<[EMAIL PROTECTED]> wrote:
> Now perhaps the in-memory list part was a bad conclusion since the queries
> can be decorated with translation functions capable of streaming the results
> out to another channel. However, the use of a universal type for t
On Tue, Nov 18, 2008 at 6:23 PM, Warren Harris <[EMAIL PROTECTED]> wrote:
> I am working on a query language translator, and although I feel that a
> monadic formulation would work well for this application, I've stumbled on a
> number of questions and difficulties that I thought the knowledgeable
On Tue, Oct 21, 2008 at 11:43 AM, Luke Palmer <[EMAIL PROTECTED]> wrote:
> Hi, I need a rather strange data structure, and I can't find any
> existing implementations or think of a way to implement it. It's a
> "multiqueue", basically a map of queues. The trick is that it should
> be lazy in its
On Sat, Oct 11, 2008 at 5:30 AM, Holger Siegel <[EMAIL PROTECTED]> wrote:
>
> - The explanation of the layout rule is wrong. If you define more than one
> value in a let declaration, then it is only required that the identifiers
> start on the same column.
Thank you - updated.
>
> - When I starte
-signatures #-}
>Start commenting out calling functions until it compiles, and then
> look at the signatures.
>And then type the signatures in explicitly... does something look funny?
> Like, wrong number of args? Maybe currying went wrong.
>
> tag and bundle a dis
All,
I've created a "cheat sheet" for Haskell. It's a PDF that tries to
summarize Haskell 98's syntax, keywords and other language elements.
It's currently available on hackage[1]. Once downloaded, unpack the
archive and you'll see the PDF. A literate source file is also
included.
If you install
On Fri, Oct 10, 2008 at 1:00 PM, Tommy M. McGuire <[EMAIL PROTECTED]> wrote:
> I would agree as well. My own flailings led to Software Tools in
> Haskell[1], which taught me more about how to actually do things[2] than the
> textbooks that I have read.
I found it really hard to just look up the s
2008/9/9 Pieter Laeremans <[EMAIL PROTECTED]>:
> What 's the best equivalent haskell approach ?
> thanks in advance,
> Pieter
The preferred approach is to look at your code, figure out where you
are using tail (or could be calling something that uses tail) and use
the "trace" function to output lo
This paper is a bit old but still very relevant:
An External Representation for the GHC Core Language
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.25.1755
Click "view or download" at the bottom to see the paper. Also, I
haven't used this utility myself yet but it pages and colori
2008/9/8 Daryoush Mehrtash <[EMAIL PROTECTED]>
>
> Thanks.
>
> Pattern matching and memory management in Haskell (or may be GHC
> implementation of it) is somewhat of a mystery to me. Are there any
> references that explains the underlying implementation?
>
> Daryoush
Be careful what you ask fo
On Thu, Sep 4, 2008 at 2:52 PM, Philippa Cowderoy <[EMAIL PROTECTED]> wrote:
> Would writing Haskell to generate the C via Language.C be an option?
> Effectively you'd be using Haskell as a typeful macro system.
Interesting idea, and I've done similar things with haskelldb
(generating SQL queries
I am thinking of writing a simple library in Haskell which would be
useful in a number of different scenarios, and not always with
programs written in Haskell. That makes me think the library should be
C-compatible and able to link with C programs. Reading over chapter 9
of the GHC manual ("Foreign
On Sun, Aug 10, 2008 at 11:47 AM, Michael Feathers
<[EMAIL PROTECTED]> wrote:
>
> unlist3 :: (a -> a -> a -> b) -> [a] -> b
> unlist3 f (x:y:z:xs) = f x y z
>
Oleg has written about this. Be careful, its easy to overdose on:
"Functions with the variable number of (variously typed) arguments"
http
On Sat, Aug 9, 2008 at 11:30 AM, Jefferson Heard
<[EMAIL PROTECTED]> wrote:
> The link is:
>
> http://bluheron.europa.renci.org/docs/BeautifulCode.pdf
Very readable and interesting. You may want to add some pictures or
graphs if you weren't planning on that already.
I really like how you have com
On Fri, Aug 1, 2008 at 11:09 AM, PJ Durai <[EMAIL PROTECTED]> wrote:
> Greetings everyone,
>
> I am having issues getting hdbc/odbc working on windows.
>
> When using GHC, I am not able to compile a simple program. It ends up
> with linker errors like
I had similar issues buidling hdbc-postgres. I
On Wed, Jul 23, 2008 at 11:10 AM, Corey O'Connor <[EMAIL PROTECTED]> wrote:
> I still have two questions after all this:
> - Can I get a Haskell implementation as fast as the Perl?
> - What do I need to do to get GHC's profiler to provide me usable
> information? Telling me that 98% of the time w
The PDX functional programming interest group will have a dinner
meeting at the location below tonight. John Goerzen had asked if there
would be a Haskell get together in Portland during OSCON. Here is one
opportunity!
-- Forwarded message --
From: Igal Koshevoy <[EMAIL PROTECTED]>
On Thu, Jul 17, 2008 at 11:14 AM, Peter Gavin <[EMAIL PROTECTED]> wrote:
> evaluated anywhere. I've used retainer profiling, and the functions that
> are leaking space according to the profiler output are strict throughout.
>
Have you looked at the Core code generated? That might show something
2008/7/9 Mitar <[EMAIL PROTECTED]>:
>
> And it took 15 s. And also the profiling was like I would anticipate.
> Calculating points coordinates and checking spheres takes almost all
> time.
>
> So any suggestions how could I build a list of objects to check at
> runtime and still have this third pe
I want to simulate various process/thread scheduling algorithms for a
small project. I'm trying to compare the performance versus power
consumption of several algorithms. If anyone knows of some Haskell
code along those lines I'd love to hear about it. Thanks in advance!
Justin
p.s. I can find no
On Wed, Apr 9, 2008 at 3:03 PM, Sebastian Sylvan
<[EMAIL PROTECTED]> wrote:
> Hmm, that's curious. I compile with "ghc --make -threaded partest.hs -o
> par.exe", and then run it with "par.exe +RTS -N2 -RTS". Am I making some
> silly configuration error?
> Are you running this on windows?
Yep, tha
On Wed, Apr 9, 2008 at 2:25 PM, Sebastian Sylvan
<[EMAIL PROTECTED]> wrote:
> Nope!
>
> This is GHC 6.8.2 btw, downloaded the binary from the web site, so it's
> nothing strange.
On my hyper-threaded CPU, your original code works fine. With -N2, I
see 100% CPU. With N1, only 50%. I am also using G
2008/4/9 Sebastian Sylvan <[EMAIL PROTECTED]>:
> main = print $ parMap rnf fib $ take 80 $ randomRs (30,35) (mkStdGen 123)
Does the strategy "rwhnf" do it for you?
Justin
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On Tue, Apr 8, 2008 at 10:24 AM, Jackm139 <[EMAIL PROTECTED]> wrote:
> import List
>
> same :: [[Char]] -> [[Char]] -> Bool
> same [xs] [ys] = map (normalize) [[xs]] == map (normalize) [[ys]]
>
> normalize :: [String] -> [String]
> normalize [xs] = [(sort (nub xs))]
>
Your pattern binding [xs
On Tue, Apr 1, 2008 at 3:18 AM, Simon Peyton-Jones
<[EMAIL PROTECTED]> wrote:
> Dear Haskell Cafe members
>
> Here's an open-ended question about Haskell vs Scheme. Don't forget to cc
> Douglas in your replies; he may not be on this list (yet)!
>
> Simon
No one seems to have pointed out how fr
On Wed, Mar 26, 2008 at 2:33 PM, Jim Snow <[EMAIL PROTECTED]> wrote:
> -Memory consumption is atrocious: 146 megs to render a scene that's a
> 33k ascii file. Where does it all go? A heap profile reports the max
> heap size at a rather more reasonable 500k or so. (My architecture is
> 64 bit
All,
Yesterday I wrote some code I thought was very clever (even though I
stole most of it) and I wonder what the pattern is. I have seen it in
at least one other place, and I suspect it's well known to long-time
Haskellers.
The problem I wanted to solved was creating a combinator that could be
d
On Wed, Mar 19, 2008 at 12:48 AM, Benjamin L. Russell
<[EMAIL PROTECTED]> wrote:
> However, in thinking about how to adapt the game, I am
> not quite sure how to incorporate the representation
> of "->" (function type):
>
> * ???: "->" (function type)
>
> What ideas, if any, would anybody hav
On Wed, Mar 19, 2008 at 10:55 AM, Marc Mertens <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I'm trying to learn to use HaskellDb. I have managed to finally compile
> and
> install it on my linux box (I have ghc 6.8.2). But when I try to create a
> database description (as described in
> http://
>From a recent interview[1] with the guy leading Ruby development on
.NET at Microsoft:
"You spend less time writing software than you spend maintaining
software. Optimizing for writing software versus maintaining software
is probably the wrong thing to do. Static typing makes it harder to
mainta
On Sun, Mar 16, 2008 at 10:21 AM, Adam Smyczek <[EMAIL PROTECTED]> wrote:
> Somehow I cannot get cookies from the Response
> using Network.Browser module (HTTP 3001.0.4).
> The cookie header part seams to be empty and
> getCookies returns empty list as well.
Network.Browser comes with a built-
2008/3/15 Greg Meredith <[EMAIL PROTECTED]>:
> All,
>
>
> The following Haskell code gives a 2-level type analysis of a
> functorial approach to introducing naming and name management into a
> given (recursive) data type. The analysis is performed by means of an
What's the upshot of this? That i
On Thu, Mar 13, 2008 at 4:50 PM, Krzysztof Kościuszkiewicz
<[EMAIL PROTECTED]> wrote:
> Retainers are thunks or objects on stack that keep references to
> live objects. All retainers of an object are called the object's
> retainer set. Now when one makes a profiling run, say with ./jobname
> +
On Wed, Mar 12, 2008 at 12:12 PM, Krzysztof Kościuszkiewicz
<[EMAIL PROTECTED]> wrote:
> I have tried both Poly.StateLazy and Poly.State and they work quite well
> - at least the space leak is eliminated. Now evaluation of the parser
> state blows the stack...
>
> The code is at http://hpaste.o
The Portland Functional Programming group is meeting again this
Monday, March 10, at 7 p.m. Join us!
-- Forwarded message --
From: Igal Koshevoy <[EMAIL PROTECTED]>
Date: Fri, Mar 7, 2008 at 11:26 AM
Subject: [pdxfunc] pdxfunc meeting: Monday, March 10, 7pm, CubeSpace
To: Igal Kos
Way off topic, but this is the cafe. The below is well worth reading.
http://changelog.complete.org/posts/698-If-Version-Control-Systems-were-Airlines.html
For the click-impaired, here's Darcs Airlines:
"Darcs Airlines: Unlike every other airline, this one uses physicists
instead of engineer
> 2008/3/4, Dimitry Golubovsky <[EMAIL PROTECTED]>:
> > Hi,
> >
> > I finally got the Yhc Web Service (web-based front end to the
> > compiler) running in public testing mode. There hasn't been any
> > documentation written, and Haddock stuff not brought in order, but if
> > anyone wants
On Mon, Mar 3, 2008 at 5:41 PM, Ben Lippmeier <[EMAIL PROTECTED]> wrote:
> Hi Justin.
>
> try: ghc -c -ddump-to-file -ddump-asm
>
Thanks, that does it. I also tried the -keep-s-files (possibly new to
6.8) and found it produces the same output.
Justin
___
I'm interested in seeing what kind of assembler my functions turn
into. Is there a means of annotating assembler output, similar to the
{#- CORE -#} pragma? Is there a trickier way of doing it?
Justin
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On Wed, Feb 27, 2008 at 1:37 PM, Hitesh Jasani <[EMAIL PROTECTED]> wrote:
> Sparklines are small, word sized graphs that can be interspersed with
> text to provide context and enhance communication. There are
> implementations in many languages and even some web services that will
> generate th
Adding pseudo columns to a projection is cumbersome, to say the list.
For example, to add a field named "hidden" to a query I have to write:
data Hide = Hide
instance FieldTag Hide where
fieldName _ = "hide"
hideField = mkAttr Hide
I wrote a little Template haskell that reduces this to
I don't know about hsql, but I have some patches that add parametes to
haskelldb. I'd be glad to send them along but I couldn't offer much
support.
2008/2/24 Roman Cheplyaka <[EMAIL PROTECTED]>:
> Is there an ability to use placeholders in SQL statement using hsql?
> (Actually I'm interested in S
2008/2/20 Jeff φ <[EMAIL PROTECTED]>:
> I'd love to find a good article that describes the ins and outs of multi
> parameter types, functional dependencies, and type assertions, in enough
> detail to resolve these surprises. A step-by-step walk through showing how
> the compiler resolve a type and
On Feb 19, 2008 8:04 AM, Peter Verswyvelen <[EMAIL PROTECTED]> wrote:
> Actually, if you look at the way OO programmers design code, they usually
> choose long descriptive names, like "FindElementByName". Most Haskell people
> seem more math oriented and use very short names, like "fst" and "snd"
That looks really cool and I'd like to try it out. Can you provide
links to these packages?
gtk >=0.9.12,
glib >=0.9.12,
sourceview >=0.9.12,
binary >=0.4.1
I just don't have time to track them down myself ...
Justin
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Haskell-Cafe mailing li
On Feb 9, 2008 2:12 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> I'd like to build a database model with winHugs that allows
> a "recursive relation". For example a single instance of
> entity "components" is related with at least another row of
> the entity "components" (1 to many relationsh
-- Forwarded message --
From: Igal Koshevoy <[EMAIL PROTECTED]>
Date: Feb 8, 2008 12:01 PM
Subject: [pdxfunc] pdxfunc meeting: Monday, February 11, 7pm, CubeSpace
To: Igal Koshevoy <[EMAIL PROTECTED]>
Join us at the next meeting of pdxfunc, the Portland Functional
Programming Stud
If Seattle is too far away, Portland has its own recently formed FP
group, PDXFP:
http://groups.google.com/group/pdxfunc
So far we're meeting every 2nd Monday of the month at CubeSpace on 6th & Grand.
Justin
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Haskell-Cafe
My apologies for the cryptic email below - I meant it for the
haskell-db users list. And now I have to apologize for this spam too.
Should I send yet another email? ;)
Justin
-- Forwarded message --
From: Justin Bailey <[EMAIL PROTECTED]>
Date: Jan 30, 2008 10:00 AM
S
All,
project doesn't easily let me add a few columns to an existing query
(or take a few columns away). Instead, each use of project requires me
to build the entire list of columns I'd like to pass on by hand.
Before I go further, if there is a way to do that, please let me know.
An example of wh
On Jan 13, 2008 11:47 PM, Sterling Clover <[EMAIL PROTECTED]> wrote:
> HStringTemplate is a port of Terrence Parr's lovely StringTemplate
> (http://www.stringtemplate.org) engine to Haskell.
Reading about the original library, I'm impressed. Can you add some
examples to your darcs repository showi
2008/1/15 Immanuel Normann <[EMAIL PROTECTED]>:
> I don't know what pairs of strings this function needs. The API
> description is to unspecific:
>
> The connect function takes some driver specific name, value pairs use to
> > setup the database connection, and a database action to run.
>
>
> What
On Jan 13, 2008 5:54 AM, Torsten Otto <[EMAIL PROTECTED]> wrote:
> Howdy,
>
> with a just-in-time-learning approach I managed to teach my class of
> advanced high schoolers the basics of functional programming using
> Haskell (I had only used Scheme before). Now to show them that Haskell
That is
I can speak to haskelldb a little, see below:
On Jan 2, 2008 3:50 AM, Peter Verswyvelen <[EMAIL PROTECTED]> wrote:
> ·regarding Haskell and databases, the page
> http://haskell.org/haskellwiki/Libraries_and_tools/Database_interfaces
> describes a few, but which are the ones that are stable
ature on relation. Removing it
allowed me to remove all extensions except MultiParameterTypeClasses.
Justin
-- Forwarded message --
From: Justin Bailey <[EMAIL PROTECTED]>
Date: Dec 31, 2007 12:25 PM
Subject: Attempt at defining typeful primary key/foreign key relationships
To: [E
When I joined the haskell-cafe mailing list, I was surprised to see
the "reply-to" header on each message was set to the sender of a given
message to the list, rather than the list itself. That seemed counter
to other mailing lists I had been subscribed to, but I didn't think
too much about it.
We
On Dec 21, 2007 2:55 PM, Bertram Felgenhauer
<[EMAIL PROTECTED]> wrote:
>
> If you look at the generated machine code, you'll find that f and g
> are identical functions. The sole purpose of the int2Word# and
> word2Int# operations is to satisfy the type checker. (This is
> even true at the core l
On Dec 21, 2007 9:48 AM, Brad Larsen <[EMAIL PROTECTED]> wrote:
> I'm curious as well. My first thought was to try the (!!) operator.
> Typing
>
>Prelude> [1..] !! 55
>
> overflows the stack on my computer, as does dropTest 55.
I think its [1..] which is building up the unevaluated th
Given this function:
dropTest n = head . drop n $ [1..]
I get a stack overflow when n is greater than ~ 550,000 . Is that
inevitable behavior for large n? Is there a better way to do it?
Justin
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h
On Dec 20, 2007 7:42 PM, Sterling Clover <[EMAIL PROTECTED]> wrote:
> I'm curious how much of the unboxing helped performance and how much
> didn't. In my experience playing with this stuff, GHC's strictness
> analyzer has consistently been really excellent, given the right
> hints. Unboxed tuples
I'm back with another version of my cellular automata simulator. Since the
last iteration I discovered GHC's unlifted types and the primitive
operations that go with them. Using these types, rather than Ints, sped my
code up by 2x or more.
http://hpaste.org/4151#a2 -- first half of program
http://
I'm working on a project which would generate a PHP data-access layer
from a Haskell model. I'm wondering what libraries might be already be
available for generating PHP or other types of code. The
pretty-printing library is one option. Any other suggestions?
Thanks in advance.
Justin
___
On Nov 29, 2007 9:11 PM, Jon Harrop <[EMAIL PROTECTED]> wrote:
> Mathematica uses a single arbitrary-precision integer to represent each
> generation of a 1D automaton. The rules to derive the next generation are
> compiled into arithmetic operations on the integer. The offloads all such
> work ont
On Nov 29, 2007 4:45 PM, Felipe Lessa <[EMAIL PROTECTED]> wrote:
> Why don't you use an UArray of Bools? They're implemented as bit
> arrays internally, AFAIK (e.g. see
> http://www.haskell.org/haskellwiki/Shootout/Nsieve ). And then you
> would get rid of a lot of shifts and masks in your code --
I posted awhile back asking for help improving my cellular automata
program. I am competing with a C program which evolves CAs using a
fairly simple genetic algorithm. The algorithm involves evaluating 100
rules on 100 CAs, 100 times. In C this takes about 1 second. In my
Haskell version, it takes
On Nov 28, 2007 10:11 AM, manu <[EMAIL PROTECTED]> wrote:
> Hello
>
> I've spent a few days trying to install all the packages required to
> use HaskellDB with either MySQL or SQlite3
> (the only 2 DB the host I was thinking about is supporting)
I'm not surprised you had this much trouble. If you
On Nov 19, 2007 10:25 AM, brad clawsie <[EMAIL PROTECTED]> wrote:
> so far the haskell community has taken the cpan route for most
> practical libs but i wonder if a "batteries included" approach might
> help get some key libraries to a more complete state. in particular, i
> would like to see supp
On Nov 15, 2007 6:25 PM, Galchin Vasili <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I have a Haskell script that contains several functions that are
> implemented in terms on "interact". When I do a "function application",
> Hugs/ghci is waiting for input from stdin. How do one denote EOF from std
On Nov 15, 2007 9:01 AM, Jim Burton <[EMAIL PROTECTED]> wrote:
> How would I go about converting the little get program at
> http://darcs.haskell.org/http/test/get.hs to use a proxy server? I tried
> adding a call to setProxy like this but it doesn't work:
I think it needs to be a real URL:
set
It's:
f $! x = x `seq` f x
That is, the argument to the right of $! is forced to evaluate, and
then that value is passed to the function on the left. The function
itself is not strictly evaluated (i.e., f x) I don't believe.
Justin
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I implement bit shifting to get the next rule, as you suggested, and
that cut my run time by 75%. It went from 200 seconds to do 100 rules
on 100 CAs to 50 seconds. Amazing.
Justin
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On Nov 13, 2007 2:49 PM, Stefan O'Rear <[EMAIL PROTECTED]> wrote:
> About how wide are your rules usually?
7 bits (3 neighbors on each side plus the current cell).
Justin
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On Nov 13, 2007 2:21 PM, Ryan Ingram <[EMAIL PROTECTED]> wrote:
> Never mind, I realized this is a ring buffer with `mod` s. That's another
> slow operation when you're doing code as tight as this. If you can
> guarantee the ring is a power of 2 in size you can use a mask instead, or
> use my or
I've been working on a program over the last few days to evolve
cellular automata rules using a genetic algorithm. Luckily, this email
has nothing to do with CAs but everything to do with Haskell
performance.
For those who don't know, a CA is represented as a row of cells, where
each can be either
On Nov 13, 2007 10:56 AM, John Lato <[EMAIL PROTECTED]> wrote:
> I know there are several important differences between let-expressions
> and where-clauses regarding scoping and the restriction of "where" to
> a top-level definition. However, frequently I write code in which
One place I find it u
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