realize is not exactly what you asked for. But hopefully you'll find
something there that can help.
Best,
Eric
On Mon, Sep 23, 2013 at 12:13 PM, Nick Vanderweit nick.vanderw...@gmail.com
wrote:
I'd be interested in more studies in this space. Does anyone know of
empirical studies on program
Might not be exactly what you're looking for, but Control.Arrow has a rich
set of operators that can be used to combine functions.
For instance, there's an example on
http://en.wikibooks.org/wiki/Haskell/Understanding_arrows showing an addA
function that can be used to apply two functions to the
recommend you use that instead of MonadCatchIO.
On Mon, Jul 22, 2013 at 4:13 AM, Eric Rasmussen
ericrasmus...@gmail.comwrote:
Arie,
Thanks for calling that out. The most useful part for my case is the
MonadCatchIO implementation of catch:
catch :: Exception e = m a - (e - m a) - m
monad.
Do you happen to know of another approach for catching IOExceptions and
throwing them in ErrorT?
Thanks,
Eric
On Sun, Jul 21, 2013 at 7:00 AM, Arie Peterson ar...@xs4all.nl wrote:
On Thursday 18 July 2013 23:05:33 Eric Rasmussen wrote:
[…]
Would there be any interest in cleaning
For the sake of approaching this in yet another way, it can also be helpful
to substitute the definitions of bind and return in your expression. If we
start with the definitions:
instance Monad [] where
xs = f = concat (map f xs)
return x = [x]
Then we can make the following transformations:
) to Control.Monad.CatchIO?
Either way I will write up a blog post on it since I couldn't find any
tutorials breaking this process down.
Thanks everyone!
On Thu, Jul 18, 2013 at 4:23 PM, Alberto G. Corona agocor...@gmail.comwrote:
Hi Eric:
The pattern may be the MonadCatchIO class:
http
somewhere.
Thanks!
Eric
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Eric,
On Sun, Apr 14, 2013 at 10:57:43AM -0700, Eric Dobson wrote:
I am working at reimplementing the library Unbound to understand how
it works. One issue I have come up with is that an equation that I
thought held true doesn't. The equation is: Forall e::Rebind a b, e
`aeq` (uncurry rebind
I am working at reimplementing the library Unbound to understand how
it works. One issue I have come up with is that an equation that I
thought held true doesn't. The equation is: Forall e::Rebind a b, e
`aeq` (uncurry rebind . unrebind $ e) = True. That is that spliting
the binding of a rebind
I agree that fromList or pattern matching at the function or case level are
readable. We probably don't need new sugar. For what it's worth, in scala
you can use - to construct tuples, so you'll sometimes see maps created
like this:
Map(1 - one, 2 - two, 3 - foo)
You can always do something
Hi Haskellers,
I'm trying to install wxHaskell on Windows XP. I have already installed Haskell
Platform 2012.04.0.0, MinGW and wxWidgets. When I try to install wx, I got the
following error when cabal is installing wxcore:
$ cabal install wx
Resolving dependencies...
[1 of 1] Compiling Main
Since no one's mentioned it yet, you might consider learning Scala. A good
starting point is http://www.artima.com/pins1ed/index.html (note that the
free edition is outdated but still a good introduction).
Scala has a mix of functional and OO programming styles, though (having
come first from
put simpler tasks into a global index. That might mix the
best of both.
I'll be happy to start accumulating information for the wiki page. I'm in
the middle of drafting a book, however, so it'll be Feb at the earliest
before I can really pay significant attention to it.
Best,
Eric
On Tue, Dec 11
2012/12/5 Christopher Howard christopher.how...@frigidcode.com:
Hi. I was wondering what the various (and especially most simple)
approaches one could take for working with (simulating or calculating)
sequential logic in Haskell. By sequential logic, I mean like wikipedia
describes, where a
I have a dream of one day being able to install leksah without having
to downgrade ghc. Right now I can't even install cabal-dev with cabal.
It will break ghc if I do.
2012/11/20 Johan Tibell johan.tib...@gmail.com:
On Tue, Nov 20, 2012 at 1:10 PM, Gregory Guthrie guth...@mum.edu wrote:
Hmm,
In his defense, from the perspective of a more or less newbie in the
subject matter, I had quite a bit of trouble using Haskell under Arch.
Not that it is so much better in other systems, I wouldn't know.
I often was in the position to decide whether to use cabal-install,
arch-haskell
I can see that the required effort would be prohibitive, but after thinking
about this some more I do think there are a couple of nice advantages:
1) Quizzes and graded assignments offer some structure to self study, and
having some form of feedback/validation when you first get started is
data ANode a b = ANode a [BNode a b] [BNode a b]
data BNode a b = BNode b [ANode a b] [ANode a b]
Wouldn't the following work as well and be simpler to handle :
data Node a b = Node a [Node b a] [Node b a]
Yes !
In fact my actual structure is not symmetrical (some lists must
preserve order
type
variables, using pairs) a known pattern ? Does it have a name ? Are
there well known (and less tedious) alternatives, or higher-level
workarounds ?
Thanks for any hint,
Eric
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I found I had to keep switching between RWH and other books for these
concepts to sink in. A really good resource that I don't see mentioned too
often is the Haskell wikibook:
http://en.wikibooks.org/wiki/Haskell
I don't remember it covering parsec specifically but if you get grounded in
all the
On 13 September 2012 20:29, wren ng thornton w...@freegeek.org wrote:
On 9/12/12 5:37 PM, Francesco Mazzoli wrote:
At Wed, 12 Sep 2012 12:04:31 -0300,
Eric Velten de Melo wrote:
It would be really awesome, though, if it were possible to use a
parser written in Parsec
Thanks for all the tips! The iteratees seem worth checking out. I'll
see what I can do and will report back if I come up with something.
Eric
On 12 September 2012 03:03, o...@okmij.org wrote:
I am currently trying to rewrite the Graphics.Pgm library from hackage
to parse the PGM to a lazy
On 12 September 2012 11:46, Eric Velten de Melo ericvm...@gmail.com wrote:
Thanks for all the tips! The iteratees seem worth checking out. I'll
see what I can do and will report back if I come up with something.
Eric
On 12 September 2012 03:03, o...@okmij.org wrote:
I am currently trying
, though, I would not know how to
recover from it.
Any thoughts? Hopefully I'm not saying anything really stupid.
Eric
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Hi,
Here is a simple shell script (upper.hs):
import Data.Char
main = interact $ map toUpper
which composes fine with other scripts:
bash-3.2$ yes | head -n 3 | runghc upper.hs
Y
Y
Y
but not always:
bash-3.2$ yes | runghc upper.hs | head -n 3
Y
Y
Y
stdout: hFlush: resource vanished (Broken
Thanks Brandon and Iavor for your (fast!) responses.
Installing a silent handler as suggested by Brandon worked nicely.
-- Éric
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[survey]: http://goo.gl/bP2fn
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the Parallel Haskell Digest question if it helps later.
On 6 Jul 2012, at 14:57, Sean Leather wrote:
Hi Eric (et Café),
On Thu, Jul 5, 2012 at 5:13 PM, Eric Kow wrote:
*[Everybody should write everything in Go?][m7] (28 May)
Ryan Hayes posted a small [snippet of Go][go-snippet] showing how
, but feedback
would still be much appreciated! Get in touch with me,
Eric Kow, at paral...@well-typed.com. Bye for now!
[ch-pdf]:
http://research.microsoft.com/en-us/um/people/simonpj/papers/parallel/remote.pdf
[dist-p]: https://github.com/haskell-distributed/distributed-process
[downfall]: http
Hello all!
I trust tried to install yesod using cabal install yesod-platform but the
installation aborted with the following error:
cabal: Error: some packages failed to install:
authenticate-1.2.1.1 depends on zlib-conduit-0.4.0.2 which failed to
install.
http-conduit-1.4.1.10 depends on
I tried running cabal install again, but just got the same error.
On Mon, Jul 2, 2012 at 10:34 PM, Alexander Foremny
alexanderfore...@gmail.com wrote:
Hello Eric,
most packages fail to install because zlib-conduit fails to install.
The reason for this -- as can be seen in the last line
I seem to remember finding a package a few days ago that would take Haskell
source with TH, then run and expand the TH macros in-place to produce
equivalent, TH-free Haskell source.
I just went through the Hackage package list and didn't find anything like that.
Did I imagine it? Or can
I added a Scala solution since Haskell is already well represented.
Regarding exercises that are easier in OO, I don't think you'll find one
that a good Haskell programmer can't match in a functional style. But if
you make simulation the goal of the exercise (rather than writing a program
that
Another suggestion is to use pattern matching at the function level:
doLex' lexer loc [] = [makeToken EOF]
doLex' lexer loc (x:xs) = case x of
' ' - more (locInc loc 1) xs
'\n'- more (locNL loc) xs
...
_ -
That saves you from having to deconstruct repeatedly in your
to make an announcement in the next Haskell Parallel
Digest, then get in touch with me, Eric Kow, at
paral...@well-typed.com. Please feel free to leave any comments and
feedback!
[lifted-base]: http://hackage.haskell.org/package/lifted-base
[tutorial-sm]: http://community.haskell.org/~simonmar
define GeniShow in terms of other things (but vice versa) because I don't want
to accidentally change my file format just because I was trying to make
something prettier. Oops.
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, then get in touch with me, Eric Kow, at
paral...@well-typed.com. Please feel free to leave any comments and
feedback!
[arswell]:
http://arstechnica.com/business/news/2012/02/transactional-memory-going-mainstream-with-intel-haswell.ars
[chat-1]: https://github.com/joeyadams/haskell-chat-server-example
, then get in touch with me, Eric Kow, at
paral...@well-typed.com. Please feel free to leave any comments and
feedback!
[chan]:
http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Concurrent-Chan.html
[dp-design]:
https://github.com/haskell-distributed/distributed-process/wiki/New
-server package
using -fopenssl flag but without -fnodebug, so I think it's normal. Any idea on
this?
Eric
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This is very helpful, I found currently almost all of the open files are
sockets. But it don't have that much traffic. So it seems it's leaking socket
file descriptors.
在 2012-1-8，下午10:50， Felipe Almeida Lessa 写道：
On Sun, Jan 8, 2012 at 12:27 PM, Gregory Collins
g...@gregorycollins.net
I run both of these commands and found out that there're sockets leaking.
Most of them are TCP connections in CLOSE_WAIT state. There're also some socket
with can't identify protocol.
So, What's the problem? Is it related to the timeout in the server config? I'm
using the default value.
在
Yes, I know it's not related to the static files now. But do I have to close
socket in snap monad? Shouldn't it be closed by snap-server?
在 2012-1-9，下午2:29， Gregory Collins 写道：
2012/1/9 Eric Wong wsy...@gmail.com
I run both of these commands and found out that there're sockets leaking.
Most
Forget to mention it, I am using HTTPS to serve all the APIs. And int the
error.log file, I got lots of ConnectionAbruptlyTerminated exceptions, which I
think is defined in OpenSSL.
在 2012-1-9，下午2:48， Gregory Collins 写道：
2012/1/9 Eric Wong wsy...@gmail.com
Yes, I know it's not related
any expertise on the core of snap, so,
could some one give me some advice on this problem?
Thanks.
Eric
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[Bikeshed image][bikeshed] by banlon1964 available
one please tell me how to improve this.
Also kindly recommend me some literature for parallel programming in Haskell.
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blocked indefinitely in an STM
transaction. There's no STM related code in my code. Do you have any idea on
this error and how to process this?
Thanks.
Eric.
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about organising such an effort?
I wonder if this is a sort of thing we could tie to the IHG...
Thanks,
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-license them AFAIK, which
may be difficult.
I could just say it'd be unrealistic. Just trying to be thorough.
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:
cab deps -i -r -a vector
Thanks! That's close enough.
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interacting with hackage and sucking down the cabal files it needs, etc?
Thanks,
Eric
[1]: http://www.haskell.org/pipermail/cabal-devel/2010-October/006657.html
[2]: http://therning.org/magnus/archives/534
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an announcement in the next Haskell Parallel
Digest, then get in touch with me, Eric Kow, at
paral...@well-typed.com. Please feel free to leave any comments and
feedback!
[sm-tutorial]: http://community.haskell.org/~simonmar/par-tutorial.pdf
[mp-paper]:
http://research.microsoft.com/en-us/um
Attached are the png files I refer to in this post.
Check out the blog version to see it all in context
http://www.well-typed.com/blog/60
On Thu, Oct 06, 2011 at 16:58:47 +0100, Eric Y. Kow wrote:
First, the bigger picture: why do we have another way of doing parallel
programming in Haskell
usage here:
https://bitbucket.org/bos/attoparsec/src/286c3d520c52/examples/
Take care,
Eric
On Tue, Sep 27, 2011 at 2:14 AM, Michael Oswald muell...@gmx.net wrote:
Hello all,
I am currently working on parser for some packets received via the network.
The data structure currently is like
repository behind this
See http://wiki.darcs.net for an example of this in action.
Would be great if Haskell wiki were also running Gitit but that's
a potentially a tougher nut to crack
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Parallel Haskell Digest
===
Edition 5
2011-08-31
Hello Haskellers!
Eric here, reprising my role as Parallel Haskell Digester. Many thanks
to Nick for good stewardship of the digest and nice new directions for
the future. This month we have Erlang PhDs (and a postdoc), new
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Best,
Eric
On Tue, Aug 2, 2011 at 4:36 PM, Mark Spezzano valh...@chariot.net.auwrote:
Hi Ata,
You could write the following
decimalPart :: Float - Integer
decimalPart f = read (tail (tail (show (f :: Integer
This basically says convert f into a String using the show function
I just found another solution that seems to work, although I don't
fully understand why. In my original function where I used EB.take to
strictly read in a Lazy ByteString and then L.hPut to write it out to
a handle, I now use this instead (full code in the annotation here:
with this part if anyone has suggestions.
Thanks again,
Eric
On Sun, Jul 24, 2011 at 10:34 AM, Felipe Almeida Lessa
felipe.le...@gmail.com wrote:
On Sun, Jul 24, 2011 at 12:28 PM, Yves Parès limestr...@gmail.com wrote:
If you used Data.Enumerator.Text, you would maybe benefit the lines
function
other feedback on how to make it better, I want to
note that I'm not planning to release this as a utility so I wouldn't
want anyone to spend extra time performing a full code review.
Thanks!
Eric
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on it and see
if I can address the concerns you brought up.
Thanks again!
Eric
On Fri, Jul 22, 2011 at 6:00 PM, Felipe Almeida Lessa
felipe.le...@gmail.com wrote:
There is one problem with your algorithm. If the user asks for 4 GiB,
then the program will create files with *at least* 4 GiB. So
I've been looking into building parsers at runtime (from a config
file), and in my case it's beneficial to fit them into the context of
a larger parser with Attoparsec.Text. This code is untested for
practical use so I doubt you'll see comparable performance to the
aforementioned regex packages,
to
build up a vector from parsing results?
Thanks for any tips or insight,
Eric
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implementation?
import qualified Data.ByteString.Char8 as B
sortLines = B.unlines . sort . B.lines
Thanks!
Eric
On Fri, Jun 24, 2011 at 7:24 AM, Henk-Jan van Tuyl hjgt...@chello.nlwrote:
On Fri, 24 Jun 2011 15:11:59 +0200, David Place d...@vidplace.com wrote:
Hi,
I've been trying to learn
, but there is still a lot of work of to do before we get there
[2]. Help wanted :-)
Enjoy!
Eric
[1] http://thread.gmane.org/gmane.comp.lang.haskell.wxhaskell.devel/612
[2] http://thread.gmane.org/gmane.comp.lang.haskell.wxhaskell.devel/616
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There is a program written in Haskell called Timeplot that does this:
http://www.haskell.org/haskellwiki/Timeplot
It's an executable rather than a library, but you can use your own Haskell
code to preprocess/format data and pipe it to the program to generate
histograms as pngs.
Best,
Eric
this helps,
Eric
[1] http://sourceforge.net/mailarchive/message.php?msg_id=24625975
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of the Haskell
web application frameworks. Eventually it'd be nice to proudly advertise all
the prominent Haskell community pages as being powered by Haskell.
Thanks!
Eric
On Fri, Jun 3, 2011 at 12:50 PM, Greg Weber g...@gregweber.info wrote:
I have been trying to make a few edits to the haskell wiki
of that framework. I'm still relatively new to the Haskell community
so I apologize if much of this has been addressed before!
On Fri, Jun 3, 2011 at 3:11 PM, Gwern Branwen gwe...@gmail.com wrote:
On Fri, Jun 3, 2011 at 4:17 PM, Eric Rasmussen ericrasmus...@gmail.com
wrote:
This is a bit
to
facilitate access by columns or rows or both, and I'd like to know if
there's a particular matrix library that would work well with this idea.
However, I'm certainly open to any other data structures that may be better
suited to the task.
Thanks!
Eric
, Tillmann Rendel
ren...@informatik.uni-marburg.de wrote:
Hi,
Eric Rasmussen wrote:
The spreadsheet analogy isn't too literal as I'll be using this for data
with a more regular structure. For instance, one grid might have 3 columns
where every item in column one is a CellStr, every item
Thanks! I think GADTs may work nicely for this project, so I'm going to
start building it out.
On Fri, May 27, 2011 at 4:16 PM, Alexander Solla alex.so...@gmail.comwrote:
On Fri, May 27, 2011 at 3:11 PM, Eric Rasmussen
ericrasmus...@gmail.comwrote:
Stephen, thanks for the link! The paper
of this discussion are promising. And for
my part, I'm going to make an effort to participate on the wiki once I wrap
a couple projects.
Best,
Eric
On Mon, May 23, 2011 at 8:31 AM, KC kc1...@gmail.com wrote:
Librarians have been struggling for years with classifying topics; I
don't imagine
I only recently started learning Haskell and have had a difficult time
convincing other Python hackers to come on board. I see two things that
might help:
1) A resource to make informed decisions about different libraries.
Something that includes specific criteria like how long a library has been
should be quite
straightforward as well.
Thanks for reading!
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Description: Bourne shell script
dist-mac.sh
Description: Bourne shell script
OS=$(shell uname)
ifeq ($(OS),Darwin)
SHARED_LIB_EXT=dylib
SHARED_LIB_FLAGS=-dynamic -shared
else
--lazy http://darcsden.com/kowey/wxhaskell
Unfortunately, this does not address Conal's issue about using wxHaskell
with GHCi on Mac. I do wish somebody had a free week to concentrate on
the issue. Maintainer Jeremy made some progress on it, the last time I
checked...
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If anybody knows what this unknown symbol `__dso_handle' means and
what we can do about it, it could be a great help
I wonder if GHC 7 makes any of this easier...
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You could read hledger[1] sources for inspiration: it's written in
Haskell and contains some (quite generic) currency parsing.
Hi Eric.. here's the code in question:
http://hackage.haskell.org/packages/archive/hledger-lib/0.14/doc/html/src/Hledger-Read-JournalReader.html#postingamount
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use), and I'd really
appreciate any insight into a better way to do this, or if there are any
built-in functions/established libraries that would be better suited to the
task. My code below works, but doesn't seem terribly efficient.
Thanks!
Eric
On Mon, May 9, 2011 at 8:15 PM, wren ng thornton w...@freegeek.org wrote:
On 5/9/11 10:04 PM, Antoine Latter wrote:
On Mon, May 9, 2011 at 5:07 PM, Eric Rasmussenericrasmus...@gmail.com
wrote:
Hi everyone,
I am relatively new to Haskell and Parsec, and I couldn't find any
Has anyone tried webfaction.com with Haskell?
I use them for custom Python web apps and they're great (competitive shared
hosting price, ssh access, easy to setup proxy apps listening on custom
ports or cgi apps with the ability to edit .htaccess). Loosely speaking it's
a cross between
outputting the results to file then reading
it in with tplot. Both worked great.
Thanks,
Eric
On Sun, May 1, 2011 at 12:14 PM, Eugene Kirpichov ekirpic...@gmail.comwrote:
Hello,
Sorry for the broken link: the correct link to the presentation is:
http://jkff.info/presentations/two-visualization
we're slowly creeping up to a point where
the list will sort of explode into being. The thing I'm most looking
forward to is people making combined use of packages, joining up work by
two completely unrelated groups.
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For a faster response, try
Thank you -- I will try your spreadsheet package for sure, and when I have
more expertise in this area I'd be happy to contribute to the wiki.
On Wed, Apr 27, 2011 at 3:00 AM, Henning Thielemann
schlepp...@henning-thielemann.de wrote:
Eric Rasmussen schrieb:
Also, in the spirit
; it shouldn't be too
much trouble to implement it myself, by imitating the existing
'decode' function but changing its behavior when it runs out of input
in the middle of a utf8-character. Also key is the property
s1 ++ s2 == decode (encode s1)) ++ decode (encode s2))
holds.
Thanks,
Eric
idea to the kit? More welcome,
of course :-)
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xmpp:ko...@jabber.fr (Jabber or Google Talk only)
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on Hackage and reading up on different
approaches, I can't seem to find a consensus in Haskell.
If anyone knows of a book/resource that breaks down different approaches to
common problems and when/why you might choose one over the other, I'm very
interested.
-Eric Rasmussen
On Tue, Apr 26, 2011
to handle this problem in full generality.
Thanks,
Eric
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Or for those of you who prefer GMane
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Enjoy!
Eric
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/concurrency puzzles,
cool projects for featured code. Other comments and feedback (criticism
and corrections especially!) would be welcome too.
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Eric Kow http://www.nltg.brighton.ac.uk/home/Eric.Kow
For a faster response, try +44 (0)1273 64 2905 or
xmpp:ko...@jabber.fr (Jabber or Google Talk only
Freedom
Conservancy for making fundraising and reimbursements so painless!
If you can't join us in person, but you'd like to cheer us on,
say hello at http://darcs.net/donations.html!
Looking forward to seeing you!
Eric
PS. Berets optional.
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Eric Kow http://www.nltg.brighton.ac.uk/home
cramming all of the possible layer
input and output types into one giant ADT in such a solution.
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Eric Mertens
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or to
Haskell. We have an ample supply of enthusiasm and ProbablyEasy bugs to
help you get started. See http://wiki.darcs.net/Recruitment for some
ideas and also have a look at http://wiki.darcs.net/Development to see
how to start coding on Darcs.
Looking forward to see you!
Guillaume and Eric
I have a project that involves building a shared library containing code
generated by GHC and exposed using the foreign function interface to
other C programs that link against it. I'm able to build a functioning
library without issue on 32bit x86 systems using GHC 6.8.2 and 6.12.3.
When I try
Thanks to http://www.well-typed.com/blog/30 I was able to figure out
what I was doing wrong. Replacing -optl -shared with just -shared
and using -dynamic allows linking to complete. :D
On 2011-01-27 11:59 AM, Eric Webster wrote:
I have a project that involves building a shared library
)
Can anyone help?
Eric M.
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. The
online tutorials I've seen aren't so in-depth, either.
Thanks,
Eric
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