Michael Roth wrote:
Hello list,
maybe I'm just stupid, I'm trying to do something like this:
Ciao Michael,
As an alternative solution to Creighton's:
import Control.Monad.List
foobar :: ListT IO Int
foobar = do
a - ListT . return $ [1,2,3]
b - ListT . return $
takeListSt' = evalState . foldr k (return []) . map (State . splitAt)
where k m m'= cutNull $ do x-m; xs-m'; return (x:xs)
cutNull m = do s-get; if null s then return [] else m
Not only is ths not that elegant anymore, I think it *still* has a
bug, stack overflow against
Kannan Goundan wrote:
I'm writing a parser with Parsec. In the input language, elements of a
sequence
are separated by commas:
[1, 2, 3]
However, instead of a comma, you can also use an EOL:
[1, 2
3]
Anywhere else, EOL is considered ignorable whitespace. So it's not as
takeListSt' = evalState . foldr k (return []) . map (State . splitAt)
where k m m'= cutNull $ do x-m; xs-m'; return (x:xs)
cutNull m = do s-get; if null s then return [] else m
|Not only is ths not that elegant anymore,
As I was saying, sequence/mapM with early cutout is
Kannan Goundan wrote:
I've implemented this functionality in a hand-written parser (basically a hack
that keeps track of whether the last read token was preceded by an EOL,
without making EOL itself a token). Does anybody have ideas about how to
do this with Parsec?
You can do exactly the
Hello wren,
Saturday, April 4, 2009, 2:51:39 AM, you wrote:
On GHC 6.10 the use of -fvia-C had to be disabled because it conflicts
with the FFI (version 0.12.0.0 still used it, which is fine on GHC 6.8).
I'm still investigating the use of -fasm and getting proper benchmarking
numbers.
On Thursday 26 March 2009 15:39:12 Manlio Perillo wrote:
I also tried with Data.HashTable:
http://hpaste.org/fastcgi/hpaste.fcgi/view?id=2902
but memory usage is 703 MB, and execution time is about 4.5 times slower!
This is due to a perf bug in GHC's GC implementation that causes it to
On Sat, Apr 4, 2009 at 12:42 PM, Jon Harrop j...@ffconsultancy.com wrote:
For comparison:
Haskell hash table: 44s
Haskell map: 7s
F# hash table: 0.7s
Ouch! That's pretty insane.
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So how does F# IntMap version compares to Haskell's IntMap?
On Sat, Apr 4, 2009 at 2:58 PM, Peter Verswyvelen bugf...@gmail.com wrote:
On Sat, Apr 4, 2009 at 12:42 PM, Jon Harrop j...@ffconsultancy.com wrote:
For comparison:
Haskell hash table: 44s
Haskell map: 7s
F# hash table:
Hi,
I tried to solve some large data processing solely in Haskell so I could
avoid lots of eventually very long and complex SQL statements.
Unfortunately, as was to be expected, that approach doesn't scale.
So I do need an SQL backend.
But I hope to be able to use an DSL from which I can
At Sat, 04 Apr 2009 15:40:56 +0200,
Günther Schmidt wrote:
But I hope to be able to use an DSL from which I can automatically
generate SQL-Strings instead of writing the SQL statements literally.
Has anyone else taken a similar approach?
HaskellDB has an DSL for generating SQL strings.
Greetings. I'm trying to render some glyphs from ttf font to svg image using
gtk2hs cairo binding. Since I can find nothing appropriate in gtk2hs API, I
decided to draw outlines with bezier curves myself. But how to get them out of
font? As far as I know, freetype library is capable of
On Saturday 04 April 2009 14:02:48 Peter Verswyvelen wrote:
On Sat, Apr 4, 2009 at 12:42 PM, Jon Harrop j...@ffconsultancy.com wrote:
For comparison:
Haskell hash table: 44s
Haskell map: 7s
F# hash table: 0.7s
So how does F# IntMap version compares to Haskell's IntMap?
Hi Jeremy,
thanks for that.
I had come across it before but I think I'd prefer a more light-weight
approach.
Günther
Jeremy Shaw schrieb:
At Sat, 04 Apr 2009 15:40:56 +0200,
Günther Schmidt wrote:
But I hope to be able to use an DSL from which I can automatically
generate SQL-Strings
Yes, the FTGL library, but it uses FTGL on the backend and not
freetype directly. You might be able to get the flyph shapes from
Pango...
On Sat, Apr 4, 2009 at 12:59 PM, Dmitry V'yal akam...@gmail.com wrote:
Greetings. I'm trying to render some glyphs from ttf font to svg
image using
A Haskell binding to Freetype2 is indeed missing. Would be nice to have.
On Sat, Apr 4, 2009 at 4:08 PM, Jeff Heard jefferson.r.he...@gmail.comwrote:
Yes, the FTGL library, but it uses FTGL on the backend and not
freetype directly. You might be able to get the flyph shapes from
Pango...
On
Hi, I'm thinking of using happstack for a simple
online registration system. [ Customer gives
Name and Address and registers for certain workshops.
Then the app server should just produce a bill.
(Payment is handled through a different channel.)
The store owner needs to get some overview of
Dmitry V'yal schrieb:
Greetings. I'm trying to render some glyphs from ttf font to svg
image using gtk2hs cairo binding. Since I can find nothing appropriate
in gtk2hs API, I decided to draw outlines with bezier curves myself.
But how to get them out of font? As far as I know, freetype
Hi.
Haskell 98 allows import alias:
import qualified VeryLongModuleName as C
however it does not allow aliasing for imported names
import NormalModule (veryLongFunctionName as C)
what is the rational?
IMHO this can be very useful in some cases.
Thanks Manlio
On Saturday 04 April 2009, Manlio Perillo wrote:
Hi.
Haskell 98 allows import alias:
import qualified VeryLongModuleName as C
however it does not allow aliasing for imported names
import NormalModule (veryLongFunctionName as C)
what is the rational?
IMHO this can be very
Am Samstag 04 April 2009 17:33:55 schrieb Manlio Perillo:
Hi.
Haskell 98 allows import alias:
import qualified VeryLongModuleName as C
however it does not allow aliasing for imported names
import NormalModule (veryLongFunctionName as C)
what is the rational?
IMHO this can be
Hi
You can always do
{-# INLINE short #-}
short =
C.veryLongFunctionNameThatIReallyDoNotWantToTypeOutEveryTimeIUseIt
The INLINE pragma is not necessary, if an optimising compiler fails to
inline that then it's not very good.
However, you might want to consider the (evil) monomorphism
Indeed. I recommend upgrading to GHC 6.10.2, all the weird floating point
FFI bugs I encountered with GHC 6.10.1 seem to be resolved now.
On Sat, Apr 4, 2009 at 12:10 PM, Bulat Ziganshin
bulat.zigans...@gmail.comwrote:
Hello wren,
Saturday, April 4, 2009, 2:51:39 AM, you wrote:
On GHC 6.10
Indeed. I recommend upgrading to GHC 6.10.2, all the weird floating point
FFI bugs I encountered with GHC 6.10.1 seem to be resolved now.
On Sat, Apr 4, 2009 at 12:10 PM, Bulat Ziganshin
bulat.zigans...@gmail.comwrote:
Hello wren,
Saturday, April 4, 2009, 2:51:39 AM, you wrote:
On GHC 6.10
Indeed. I recommend upgrading to GHC 6.10.2, all the weird floating point
FFI bugs I encountered with GHC 6.10.1 seem to be resolved now.
On Sat, Apr 4, 2009 at 12:10 PM, Bulat Ziganshin
bulat.zigans...@gmail.comwrote:
Hello wren,
Saturday, April 4, 2009, 2:51:39 AM, you wrote:
On GHC 6.10
Johannes,
You'll have a better response if you post to the happs list.
Have you had a look at tutorial.happstack.com?
Thomas.
2009/4/4 Johannes Waldmann waldm...@imn.htwk-leipzig.de:
Hi, I'm thinking of using happstack for a simple
online registration system. [ Customer gives
Name and
Copied there.
On Sat, Apr 4, 2009 at 1:30 PM, Thomas Hartman tphya...@gmail.com wrote:
Johannes,
You'll have a better response if you post to the happs list.
Have you had a look at tutorial.happstack.com?
Thomas.
2009/4/4 Johannes Waldmann waldm...@imn.htwk-leipzig.de:
Hi, I'm
Thanks Claus,
Indeed the problem was that I was using the Strict state monad, with
lazy state it does the right thing when run through testP. I will try
and get back to this thread if I manage the derivation which proves
(or at least supports) that the two versions are equivalent.
2009/4/4
The instructions in the leksah manuals seem to work for doing a
straight-up ports install of gtk2hs. I've never managed to get it to
install without compiling manually, but this worked
$ sudo port install gtk2 cairo librsvg libglade2 gtksourceview2
gtkglext gtk-chtheme gtk2-clearlooks
$ sudo
I tried installing leskah on OS X using the x11 version of gtk2hs
(because I use gtkglext a lot in my work, and need it, therefore the
quartz build won't work for me) I get these errors. Is this leksah
specific or is this a more general problem with gtk2hs?
Linking dist/build/leksah/leksah ...
Hi Jeff,
On Sat, Apr 4, 2009 at 10:57 AM, Jeff Heard jefferson.r.he...@gmail.com wrote:
The instructions in the leksah manuals seem to work for doing a
straight-up ports install of gtk2hs. I've never managed to get it to
install without compiling manually, but this worked
$ sudo port
On Sat, Apr 4, 2009 at 12:15 PM, Jason Dagit da...@codersbase.com wrote:
I think people might be able to help you, but I think we need the
exact error message. Unfortunately, won't link is a bit too vague
to make any suggestions.
Nevermind my message. I see you sent the error in a different
Is it me or the above package is not included in Hoogle?
Cristiano
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I tried to get yi to run on my Mac earlier and I get the following errors:
dyld: lazy symbol binding failed: Symbol not found:
_cairo_quartz_font_face_create_for_atsu_font_id
Referenced from: /opt/local/lib/libpangocairo-1.0.0.dylib
Expected in: /opt/local/lib/libcairo.2.dylib
dyld: Symbol
Hello Cristiano,
Sunday, April 5, 2009, 12:05:02 AM, you wrote:
Is it me or the above package is not included in Hoogle?
afair, Neil, being windows user, includes only packages available for
his own system
there was a large thread a few months ago and many peoples voted for
excluding any
On Sat, Apr 4, 2009 at 10:21 PM, Bulat Ziganshin
bulat.zigans...@gmail.com wrote:
Hello Cristiano,
...
there was a large thread a few months ago and many peoples voted for
excluding any OS-specific packages at all since this decreases
portability of code developed by Hoogle users :)))
Nice
cristiano.paris:
On Sat, Apr 4, 2009 at 10:21 PM, Bulat Ziganshin
bulat.zigans...@gmail.com wrote:
Hello Cristiano,
...
there was a large thread a few months ago and many peoples voted for
excluding any OS-specific packages at all since this decreases
portability of code developed by
brad clawsie wrote:
does anyone have a .editrc they can provide that allows ghci to be used
on freebsd?
i'm not looking for anything fancy, just backspace not being broken etc
You could try to cabal install ghci-haskeline and see if that works better.
Cheers
Ben
On Wed, 1 Apr 2009, Don Stewart wrote:
bugfact:
Rumor goes that this is very difficult to do with Darcs. Is this correct?
darcs unpull
Be careful - you cannot revert this! If you want to unpull patches, that
were not distributed so far, you should better call 'darcs get' to get a
On Fri, 3 Apr 2009, Jeff Heard wrote:
Jurgen... I have one more question, or rather request... I'm running
under Ubuntu, and I get inconsistencies with packages that I build and
install via Leksah not showing up when I configure other packages that
depend on them. Then I notice that you're
On Thu, 2 Apr 2009, Bjorn Buckwalter wrote:
I'm pleased to announce the initial release of the Haskell fad
library, developed by Barak A. Pearlmutter and Jeffrey Mark Siskind.
Fad provides Forward Automatic Differentiation (AD) for functions
polymorphic over instances of 'Num'. There have been
Is there a simple way to combine two sequences that are in ascending order into
a single sequence that's also in ascending order? An example would be the
squares [1,4,9,16,25..] combined with the cubes [1,8,27,64,125..] to form
[1,1,4,8,9,16,25,27..].
Michael
Here's a pretty straightforward approach:
combine [] ys = ys
combine xs [] = xs
combine (x:xs) (y:ys) | x = y = x : combine xs (y:ys)
| otherwise = y : combine (x:xs) ys
On Sat, Apr 4, 2009 at 8:40 PM, michael rice nowg...@yahoo.com wrote:
Is there a simple
Henning Thielemann lemm...@henning-thielemann.de writes:
On Wed, 1 Apr 2009, Don Stewart wrote:
bugfact:
Rumor goes that this is very difficult to do with Darcs. Is this correct?
darcs unpull
Be careful - you cannot revert this! If you want to unpull patches,
that were not distributed
Thanks, guys! This one works perfectly.
I was monkeying with similar logic but wasn't sure about syntax.
Michael
--- On Sat, 4/4/09, Andrew Wagner wagner.and...@gmail.com wrote:
From: Andrew Wagner wagner.and...@gmail.com
Subject: Re: [Haskell-cafe] Combining sequences
To: michael rice
---
Haskell Weekly News
http://sequence.complete.org/hwn/20090405
Issue 112 - April 05, 2009
---
Welcome to issue 112 of HWN, a newsletter covering
Jeff Heard wrote:
I tried to get yi to run on my Mac earlier and I get the following errors:
dyld: lazy symbol binding failed: Symbol not found:
_cairo_quartz_font_face_create_for_atsu_font_id
Referenced from: /opt/local/lib/libpangocairo-1.0.0.dylib
Expected in:
vigalc...@ubuntu:~/FTP$ darcs get http://code.haskell.org/leksah
Invalid repository: http://code.haskell.org/leksah
darcs failed: Failed to download URL
http://code.haskell.org/leksah/_darcs/inventory : HTTP error (404?)
I did a google on HTTP 404 = not found why?
Kind regards, Vasili
On Sun, 2009-04-05 at 07:12 +0200, Bertram Felgenhauer wrote:
This looks like the quartz backend was disabled in the cairo C library,
not like a gtk2hs problem. I don't know how ports work, but
http://trac.macports.org/browser/trunk/dports/graphics/cairo/Portfile
defines a 'quartz'
Vasili I. Galchin wrote:
vigalc...@ubuntu:~/FTP$ darcs get http://code.haskell.org/leksah
Invalid repository: http://code.haskell.org/leksah
darcs failed: Failed to download URL
http://code.haskell.org/leksah/_darcs/inventory : HTTP error (404?)
I did a google on HTTP 404 = not found
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