On Sat, Jan 17, 2009 at 11:19 PM, Dan Piponi wrote:
> On Sat, Jan 17, 2009 at 1:47 AM, david48 wrote:
>> why would I
>> need to write a running count this way instead of, for example, a non
>> monadic fold, which would probably result in clearer and faster code?
>
> Maybe my post here will answe
Manlio Perillo wrote:
By the way, I have managed to have a working program:
http://hpaste.org/13919
I would like to receive some advices:
1) I have avoided the do notation,
As Paolo Losi says, there's nothing wrong with do-notation. You should
use whichever style makes your code the easiest t
Ketil Malde wrote:
Sjoerd Visscher writes:
JSON is a UNICODE format, like any modern format is today. ByteStrings
are not going to work.
Well, neither is String as used in the code I responded to. I'm not
intimately familiar with JSON, but I believe ByteStrings would work on
UTF-8 input, an
Duncan Coutts wrote:
It may well be tempting to plague maintainers until they fix their
packages however in practise it will not work. We want a low barrier to
entry for packages on hackage and we do not want to annoy package
maintainers to the point where they decide to stop using hackage at all
Andrew Coppin wrote:
> I would suggest that ExistentiallyQuantifiedTypeVariables would be an
> improvement [...]
That must be a joke. Typing the long extension names in LANGUAGE
pragmas over and over again is tiring and annoying enough already. We
really don't need even longer names, and your
On Sat, 2009-01-17 at 10:47 +0100, david48 wrote:
> On Fri, Jan 16, 2009 at 4:04 PM, Jonathan Cast
> wrote:
>
> > On Fri, 2009-01-16 at 14:16 +0100, david48 wrote:
> >> Part of the problem is that something like a monoid is so general that
> >> I can't wrap my head around why going so far in the
On Sat, 2009-01-17 at 11:07 +, Andrew Coppin wrote:
> Anton van Straaten wrote:
> > Niklas Broberg wrote:
> >>> I still think existential quantification is a step too far though. :-P
> >>
> >> Seriously, existential quantification is a REALLY simple concept, that
> >> you would learn week two (
On Sat, 2009-01-17 at 12:04 +, Andrew Coppin wrote:
> Eugene Kirpichov wrote:
> > No, a functor is a more wide notion than that, it has nothing to do
> > with collections.
> > An explanation more close to truth would be "A structure is a functor
> > if it provides a way to convert a structure o
On Sun, 2009-01-18 at 00:34 -0500, Bjorn Buckwalter wrote:
> Thanks for the pointer. My "source" is the Earth Orientation Parameter
> (EOP) data at http://www.celestrak.com/SpaceData/; specifically I
> autogenerate the module from
> http://www.celestrak.com/SpaceData/eop19620101.txt. Probably looks
On Sun, Jan 18, 2009 at 00:00, Ashley Yakeley wrote:
> Bjorn Buckwalter wrote:
>>
>> leapseconds-announced is a pragmatic, if imperfect, improvement over
>> my past practices. It provides a LeapSecondTable with all leap seconds
>> announced to date (hence the name). Once the IERS announces[3] anot
Maybe. Handling the common cases reasonably well is
probably worth doing first (+profiling) before opting for
a heart&lung transplant..
To wit, I've trivially improved the handling of string and
integer lits in version 0.4.3 (just released.) It cuts down
the running times by a factor of 2-3 on l
Bjorn Buckwalter wrote:
leapseconds-announced is a pragmatic, if imperfect, improvement over
my past practices. It provides a LeapSecondTable with all leap seconds
announced to date (hence the name). Once the IERS announces[3] another
leap second the package will need an update and all code using
Hi everyone,
I'm pleased to announce a new package I've just uploaded to hackage:
language-sh. It's a set of modules for parsing, manipulating, and
printing sh-style shell scripts. It's being developed alongside shsh,
the Simple Hakell Shell (available at http://code.haskell.org/shsh/,
but it's
On Thu, 2009-01-15 at 13:40 +0100, Apfelmus, Heinrich wrote:
> Eugene Kirpichov wrote:
> > Well, your program is not equivalent to the C++ version, since it
> > doesn't bail on incorrect input.
>
> Oops. That's because my assertion
>
>show . read = id
>
> is wrong. We only have
>
>read
G'day all.
Dan Weston wrote:
Richard Feinman once said: "if someone says he understands quantum
mechanics, he doesn't understand quantum mechanics".
But what did he know...
Presumably not quantum mechanics.
Cheers,
Andrew Bromage
___
Haskell-Ca
Hackage is about to reach the 1000 release mark, 2 years after it went
live.
That's right: in 2 years we've gone from having only a handful of
released projects, to one thousand! Well done everyone!
I did some quick visualisation of the rate of new releses, diversity of
packages, and community g
G'day all.
Quoting John Goerzen :
If I see Appendable I can guess what it might be. If I see "monoid", I
have no clue whatsoever, because I've never heard of a monoid before.
Any sufficiently unfamiliar programming language looks like line noise.
That's why every new language needs to use cu
Hi Sigbjorn,
On Thu, Jan 15, 2009 at 10:36:35PM -0800, Sigbjorn Finne wrote:
>
> I've yet to gain access to www.haskell.org and update
> http://www.haskell.org/http,
Perhaps this would be a good point to move the website to the community
server?
Thanks
Ian
__
On Saturday 17 January 2009 8:28:05 am Bulat Ziganshin wrote:
> Hello Luke,
>
> Saturday, January 17, 2009, 3:16:06 PM, you wrote:
> > fmap id = id
> > fmap (f . g) = fmap f . fmap g
> >
> > The first property is how we write "preserving underlying
> > structure", but this has a precise, well-
G'day all.
Quoting Gracjan Polak :
I remember my early CS algebra courses. I met cool animals there: Group,
Ring, Vector Space. Those beasts were very strong, but also very calm at
the same time. Although I was a bit shy at first, after some work we
became friends.
I don't know about you, bu
ilmari.vacklin:
> 2009/1/18 Matti Niemenmaa :
> > Announcing the release of Coadjute, version 0.0.1!
>
> Hi,
>
> trying to build on GHC 6.10.1 I get:
>
> Building regex-dfa-0.91...
>
> Text/Regex/DFA/Common.hs:6:7:
> Could not find module `Data.IntMap':
> it is a member of package con
matti.niemenmaa+news:
> Announcing the release of Coadjute, version 0.0.1!
>
> Web site: http://iki.fi/matti.niemenmaa/coadjute/
> Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Coadjute
>
Here's an Arch Linux package for it,
http://aur.archlinux.org/packages.php?ID=232
2009/1/18 Matti Niemenmaa :
> Announcing the release of Coadjute, version 0.0.1!
Hi,
trying to build on GHC 6.10.1 I get:
Building regex-dfa-0.91...
Text/Regex/DFA/Common.hs:6:7:
Could not find module `Data.IntMap':
it is a member of package containers-0.2.0.0, which is hidden
cabal:
Announcing the release of Coadjute, version 0.0.1!
Web site: http://iki.fi/matti.niemenmaa/coadjute/
Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Coadjute
Coadjute is a generic build tool, intended as an easier to use and more
portable replacement for make. It’s not tailo
I'm pleased to announce another hledger release. Happy new year, all!
hledger is a partial haskell clone of John Wiegley's "ledger" text-based
accounting tool. It generates transaction & balance reports from a
plain
text ledger file, and demonstrates a functional implementation of
ledger.
F
Attoparsec does not have something like the Stream class, so I do not
see how I could do UTF8 parsing easily.
On Jan 17, 2009, at 11:50 PM, Don Stewart wrote:
It occurs to me you could also use attoparsec, which is specifically
optimised for bytestring processing.
sjoerd:
Hi,
Somebody told
I personally spurned MacPorts for this reason (and others). I've had
good success using the GTK+ Aqua framework from http://www.gtk-
osx.org/ and manually compiling pkg-config and gtk2hs from the darcs
repository. The only "trick" was to set PKG_CONFIG_PATH appropriately
before running gtk2h
On 17/01/2009 20:45, "Eugene Kirpichov" wrote:
> A very short time ago Simon Marlow (if I recall correctly) commented
> on this topic: he told that this transformation usually improves
> efficiency pretty much, but sometimes it leads to some problems and it
> shouldn't be done by the compiler aut
That would probably be the problem, then, yes. I'm still using GHC
6.8.3 in most of my code, but MacPorts doesn't respect the existing
installation of GHC 6.8.3 that I installed via the DMG package on
http://haskell.org/ghc
On Sat, Jan 17, 2009 at 5:56 PM, Yitzchak Gale wrote:
> Jeff,
>
> I'm no
Jeff,
I'm not sure if this is causing the problem you're referring to,
but MacPorts is at GHC 6.10 while Gtk2Hs doesn't support
that yet.
Regards,
Yitz
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It occurs to me you could also use attoparsec, which is specifically
optimised for bytestring processing.
sjoerd:
> Hi,
>
> Somebody told me about Parsec 3, which uses a Stream type class so it
> can parse any data type. This sounded like the right way to do
> encoding independent parsing, so
Am Samstag, 17. Januar 2009 23:20 schrieb Alberto G. Corona:
> Hi guys:
>
> I don´t know how difficult really is, but it seens that it could be done
> because all the necessary elements are there (except perhaps the mapping
> package name-hackage url): Why hasn´t been done yet Is unknown to me.
> I
Hi guys:
I don´t know how difficult really is, but it seens that it could be done
because all the necessary elements are there (except perhaps the mapping
package name-hackage url): Why hasn´t been done yet Is unknown to me.
It would be very useful and a big save of time to have a cabal commad
"c
On Sat, Jan 17, 2009 at 1:47 AM, david48 wrote:
> why would I
> need to write a running count this way instead of, for example, a non
> monadic fold, which would probably result in clearer and faster code?
Maybe my post here will answer some questions like that:
http://sigfpe.blogspot.com/2009/0
On Sat, Jan 17, 2009 at 9:16 AM, david48
> wrote:
> On Sat, Jan 17, 2009 at 4:08 PM, David Leimbach wrote:
>
> > So you're saying it should be better documented in Haskell what a Monoid
> is.
> > Did you say you searched for "C++ class" why not "Haskell Monoid" then?
> > The first correct goog
Hi,
Somebody told me about Parsec 3, which uses a Stream type class so it
can parse any data type. This sounded like the right way to do
encoding independent parsing, so I decided to see how it would work to
parse UTF8 JSON.
Sadly I could not use Text.JSON.Parsec directly, because it uses
A very short time ago Simon Marlow (if I recall correctly) commented
on this topic: he told that this transformation usually improves
efficiency pretty much, but sometimes it leads to some problems and it
shouldn't be done by the compiler automatically. Search the recent
messages for 'map' and one
On 17/01/2009 16:55, "Luke Palmer" wrote:
Wow. I strongly suggest you forget about efficiency completely and become a
proficient high-level haskeller, and then dive back in. Laziness changes
many runtime properties, and renders your old ways of thinking about
efficiency almost useless.
If you a
On Fri, 2009-01-16 at 21:17 +, Chris Kuklewicz wrote:
> And regex-posix has a very "old school" Setup.hs file with a small addition:
>
> > #!/usr/bin/env runhaskell
> >
> > -- I usually compile this with "ghc --make -o setup Setup.hs"
> >
> > import Distribution.Simple(defaultMainWithHooks,
Just started up a blog on my own random lumberings through Haskell and
the visualizations I've produced in Haskell. Have plenty of content
on backlog, so I should be updating regularly. That's about all!
http://vis.renci.org/jeff/
-- Jeff
___
Haskell-
On Sat, Jan 17, 2009 at 11:09 AM, Pieter Laeremans wrote:
> Hello,
>
> When I try to render a byteString template using outputFPS like this :
>
> outputBsTemplate :: StringTemplate ByteString -> CGI CGIResult
> outputBsTemplate template = let bs = renderFPS template in
>
Hello,
When I try to render a byteString template using outputFPS like this :
outputBsTemplate :: StringTemplate ByteString -> CGI CGIResult
outputBsTemplate template = let bs = renderFPS template in
outputFPS bs
I get this error :
Couldn't match expected type `Da
On Sat, Jan 17, 2009 at 4:08 PM, David Leimbach wrote:
> So you're saying it should be better documented in Haskell what a Monoid is.
> Did you say you searched for "C++ class" why not "Haskell Monoid" then?
> The first correct google hit that didn't think I meant Monads, takes you
> straight t
On Fri, 2009-01-16 at 17:57 +0300, Bulat Ziganshin wrote:
> Hello Sigbjorn,
>
> Friday, January 16, 2009, 5:42:06 PM, you wrote:
>
> first question: are these packages (http, curl, curl-shell, webclient)
> windows-compatible? second - that is advantages of using http (or
> webclient) over curl?
On Sat, Jan 17, 2009 at 9:46 AM, Phil wrote:
> In the second example we probably have something like 6 'JMP' statements
> in machine code – 3 to jump in to each function, and 3 to jump back out. In
> the first we have 2 – one to jump us into mcSimulate and one to return. So
> each iteration ex
Hi,
I¹ve been thinking about factoring constants out of iterations and have
spotted another place in my code where I can make use of this.
See the two examples below the first example iterates over the mcSimulate
function this has changed a little bit but essentially still recurses
around pas
There's however still no framework which supports both HTTP client and
server functions using the same Request and Response data type, right? I
don't know whether I am the only one who needs this (e.g. for the Real
Monad Transformer). E.g. a proxy would need this, too.
I've wanted this for a whi
On Sat, Jan 17, 2009 at 7:33 AM, Lennart Augustsson
wrote:
> Thinking that Functor allows you to apply a function to all elements
> in a collection is a good intuitive understanding. But fmap also
> allows applying a function on "elements" of things that can't really
> be called collections, e.g.
Thinking that Functor allows you to apply a function to all elements
in a collection is a good intuitive understanding. But fmap also
allows applying a function on "elements" of things that can't really
be called collections, e.g., the continuation monad.
-- Lennart
On Sat, Jan 17, 2009 at 11:
/opt/local/bin/ghc +RTS -RTS -c tools/hierarchyGen/TypeGen.hs -o
tools/hierarchyGen/TypeGen.o -O -itools/hierarchyGen -package-conf
package.conf.inplace -hide-all-packages -package base
package.conf.inplace: openBinaryFile: does not exist (No such file or directory)
/opt/local/bin/ghc +RTS -RTS -c
On Sat, Jan 17, 2009 at 1:41 AM, david48
> wrote:
> On Fri, Jan 16, 2009 at 3:10 PM, Bulat Ziganshin
> wrote:
> > Hello david48,
> >
> > Friday, January 16, 2009, 4:16:51 PM, you wrote:
> >
> >> Upon reading this thread, I asked myself : what's a monoid ? I had no
> >> idea. I read some posts, t
Hello Luke,
Saturday, January 17, 2009, 3:16:06 PM, you wrote:
> fmap id = id
> fmap (f . g) = fmap f . fmap g
> The first property is how we write "preserving underlying
> structure", but this has a precise, well-defined meaning that we can
> say a given functor obeys or it does not (and i
On Sat, Jan 17, 2009 at 5:04 AM, Andrew Coppin
wrote:
> Eugene Kirpichov wrote:
>
>> No, a functor is a more wide notion than that, it has nothing to do
>> with collections.
>> An explanation more close to truth would be "A structure is a functor
>> if it provides a way to convert a structure over
2009/1/17 Andrew Coppin :
> Eugene Kirpichov wrote:
>>
>> No, a functor is a more wide notion than that, it has nothing to do
>> with collections.
>> An explanation more close to truth would be "A structure is a functor
>> if it provides a way to convert a structure over X to a structure over
>> Y,
Eugene Kirpichov wrote:
No, a functor is a more wide notion than that, it has nothing to do
with collections.
An explanation more close to truth would be "A structure is a functor
if it provides a way to convert a structure over X to a structure over
Y, given a function X -> Y, while preserving t
2009/1/17 Andrew Coppin :
> Cory Knapp wrote:
>>
>> Actually, that was part of my point: When I mention Haskell to people, and
>> when I start describing it, they're generally frightened enough by the focus
>> on pure code and lazy evaluation-- add to this the inherently abstract
>> nature, and we
The great "that's why" is as follows: when you have an abstraction,
then it is sufficient to hold the abstraction in mind instead of the
whole concrete implementation. That's the whole purpose of
abstraction, after all, be it maths or programming.
Let me illustrate this.
Suppose you are developin
Cory Knapp wrote:
Actually, that was part of my point: When I mention Haskell to people,
and when I start describing it, they're generally frightened enough by
the focus on pure code and lazy evaluation-- add to this the
inherently abstract nature, and we can name typeclasses
"cuddlyKitten", a
Hello,
2009/1/16 Immanuel Litzroth :
> I don't understand your comment.
> 1) If XMonad already uses it the problem is solved, without giving Haskell
> import new semantics?
Right, but there are some restrictions.
> 2) These guys refer to a method to do plugin work in Haskell
> http://www.cse.uns
Anton van Straaten wrote:
Niklas Broberg wrote:
I still think existential quantification is a step too far though. :-P
Seriously, existential quantification is a REALLY simple concept, that
you would learn week two (or maybe three) in any introductory course
on logic. In fact, I would argue th
On Fri, Jan 16, 2009 at 10:28 PM, Apfelmus, Heinrich
wrote:
> david48 wrote:
>> I don't care about the name, it's ok for me that the name
>> mathematicians defined is used, but there are about two categories of
>> people using haskell and
>> I would love that each concept would be adequately doc
On Fri, Jan 16, 2009 at 4:04 PM, Jonathan Cast
wrote:
> On Fri, 2009-01-16 at 14:16 +0100, david48 wrote:
>> Part of the problem is that something like a monoid is so general that
>> I can't wrap my head around why going so far in the abstraction.
>> For example, the writer monad works with a mon
On Fri, Jan 16, 2009 at 3:10 PM, Bulat Ziganshin
wrote:
> Hello david48,
>
> Friday, January 16, 2009, 4:16:51 PM, you wrote:
>
>> Upon reading this thread, I asked myself : what's a monoid ? I had no
>> idea. I read some posts, then google "haskell monoid".
>
> it would be interesting to google "
I think you need to remove your users database (and rebuild
it). Compatibility was broken in version 0.3.4 (not sure of number).
HTH
--
Arnaud Bailly, PhD
OQube - Software Engineering
http://www.oqube.com
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