Hi cafe.
recently I was looking at various possibilities of generating random
numbers in Haskell. Apparently, the main problem is the 'split' function
in the System.Random.RandomGen class. Since it is rarely needed in
imperative programs, not much is known how to implement it safely. It's
doc
Quick update: I'm including the "Stylish" code in the hamlet package now,
and renaming it to "Camlet" (CSS-hamlet). I'm also including something
called "Jamlet", which doesn't do much besides variable interpolation. As
you might guess, it's for Javascript. I mention it at the end of my most
recent
Recently I wrote a 3D graphics viewer using Gtk2hs and Cairo, and it works ok,
aside from the fact that it got quite slow when it got to displaying about 1000
polygons. It works something like this: The three-dimensional coordinates of
polygons are given, and the program sorts the polygons usin
Gtk2hs has an OepnGL binding. So you can create OpenGL context and draw there.
I don't think you will still be able to use parallel threads, but path
to hardware renderer will be shorter for sure.
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On Sun, Aug 8, 2010 at 9:20 PM, Michael Snoyman wrote:
> Quick update: I'm including the "Stylish" code in the hamlet package now,
> and renaming it to "Camlet" (CSS-hamlet). I'm also including something
> called "Jamlet", which doesn't do much besides variable interpolation. As
> you might guess
Hi Herng,
You can use gtk2hs with OpenGL, then use OpenGL render your 3D graphics.
You can use command
cabal install install gtkglext
to try it, demo at http://code.haskell.org/gtkglext/demo/
About multi-threaded, yes, you must post all *gtk* code to gtk+
main thread, otherwise bad thing will
Did you install libmysqlclient? sudo port install should handle this, IIRC.
There's also this problem in general with MySQL, it seems:
http://www.google.co.uk/#q=libmysqlclient+os+x
On 8 August 2010 03:27, Carter Schonwald wrote:
> Hey All,
> when i build hdbc-mysql and then try to run some exa
> Date: Sun, 8 Aug 2010 12:53:54 +0300
> Subject: Re: [Haskell-cafe] Combining Gtk2hs and Fieldtrip
> From: sergu...@gmail.com
> To: hern...@gmail.com
> CC: haskell-cafe@haskell.org
>
> Gtk2hs has an OepnGL binding. So you can create OpenGL context and draw there.
>
> I don't think you will stil
On Sun, Aug 8, 2010 at 1:03 PM, Tim Matthews wrote:
> On Sun, Aug 8, 2010 at 9:20 PM, Michael Snoyman wrote:
>
>> Quick update: I'm including the "Stylish" code in the hamlet package now,
>> and renaming it to "Camlet" (CSS-hamlet). I'm also including something
>> called "Jamlet", which doesn't do
Sassy?
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On Sun, Aug 8, 2010 at 4:00 AM, Michael Snoyman wrote:
>
>
> On Sun, Aug 8, 2010 at 1:03 PM, Tim Matthews
> wrote:
>>
>> On Sun, Aug 8, 2010 at 9:20 PM, Michael Snoyman
>> wrote:
>>>
>>> Quick update: I'm including the "Stylish" code in the hamlet package now,
>>> and renaming it to "Camlet" (CS
On Sun, Aug 8, 2010 at 3:15 PM, Alexander Dunlap
wrote:
> On Sun, Aug 8, 2010 at 4:00 AM, Michael Snoyman wrote:
>>
>>
>> On Sun, Aug 8, 2010 at 1:03 PM, Tim Matthews
>> wrote:
>>>
>>> On Sun, Aug 8, 2010 at 9:20 PM, Michael Snoyman
>>> wrote:
Quick update: I'm including the "Stylish"
What is <- ? Couldn't find anything on Hoogle.
1) main = do
x <- getLine -- get the value from the IO monad
putStrLn $ "You typed: " ++ x
2) pythags = do
z <- [1..] --get the value from the List monad?
x <- [1..z]
y <- [x..z]
guard (x^2 + y^2 == z^2)
On Sun, 8 Aug 2010, michael rice wrote:
So, Example 2 desugared becomes...
[1..] >== \z -> ?
Yes, [1..] >>= \z -> ...
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In shortyes, "do z <- ..; foo" desugars to "... >>= \z -> foo"
The Haskell Report describes `do' notation in detail:
http://www.haskell.org/onlinereport/exps.html#sect3.14
Real World Haskell describes its uses:
http://book.realworldhaskell.org/read/io.html#io.bind
On 8 August 2010 15:36, micha
On 8 Aug 2010, at 17:36, michael rice wrote:
What is <- ? Couldn't find anything on Hoogle.
1) main = do
x <- getLine -- get the value from the IO monad
putStrLn $ "You typed: " ++ x
2) pythags = do
z <- [1..] --get the value from the List monad?
x <- [1..z]
getLine >>= \x -> -- x is a string at this point
[1..] >>= \x -> -- x is WHAT at this point?
MIchael
--- On Sun, 8/8/10, Henning Thielemann wrote:
From: Henning Thielemann
Subject: Re: [Haskell-cafe] What is <-
To: "michael rice"
Cc: haskell-cafe@haskell.org
Date: Sunday, August
On 8 August 2010 16:21, michael rice wrote:
> getLine >>= \x -> -- x is a string at this point
>
> [1..] >>= \x ->-- x is WHAT at this point?
>
Num n => n
A number from the list.
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Hi Michael,
although I never used it myself, lists seem strange in the way that when
combining list monads, then all the values go through the chain one by one
-- x will be 1 first, then 2, then 3 and so on.. Try it out, to see. (I
think the result is then also a list of all combinations of result
If xs is a list,
xs >>= f
is the same as (concat (map f xs)). Take a look at the monad instance
for lists. So, in
[1..] >>= \x ->
x is "every" element of the list. Example:
[1,2,3] >>= \x -> [x, x*2]
is
concat
[ (\x -> [x, x*2]) 1
, (\x -> [x, x*2]) 2
, (\x -> [x, x*2]) 3
]
Hello michael,
Sunday, August 8, 2010, 5:36:05 PM, you wrote:
i highly recommend you to read
http://sigfpe.blogspot.com/2006/08/you-could-have-invented-monads-and.html
that is the best introduction into monads i know
and then http://haskell.org/all_about_monads/html/index.html
- comprehensive tu
Daniel van den Eijkel schrieb:
If xs is a list,
xs >>= f
is the same as (concat (map f xs)). Take a look at the monad instance
for lists. So, in
[1..] >>= \x ->
x is "every" element of the list. Example:
[1,2,3] >>= \x -> [x, x*2]
is
concat
[ (\x -> [x, x*2])
Hi all,
for build ghc from source, how can I set which c-compiler to use?
./configure --with-gcc=
does not seem to work for ghc-6.12.3 nor does setting the CC-environment
variable.
Günther
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That was my suspicion. So, you can't change horses (monads) in mid-stream.
A parallel question:
main = do ... -- in the IO monad
I know I can have other *do*s in main,
if foo
then do
.
.
else do
.
.
but must all these other *do
On Sun, 8 Aug 2010, michael rice wrote:
That was my suspicion. So, you can't change horses (monads) in mid-stream.
A parallel question:
main = do ... -- in the IO monad
I know I can have other *do*s in main,
if foo
then do
.
.
else do
.
michael rice wrote:
> That was my suspicion. So, you can't change horses (monads) in mid-stream.
>
> A parallel question:
>
> main = do ...-- in the IO monad
>
> I know I can have other *do*s in main,
>
> if foo
> then do
> .
> .
> else do
>
I did`nt care about the underlying theory behind monads once I learn that
the easy way to understand them is trough desugarization. Desugarize the
"do" notation, after that, desugarize the >>= and >> operators down to the
function call notation and suddenly everithing lost its magic because it
bec
Alberto G. Corona writes:
(...) Desugarize the
"do" notation, after that, desugarize the >>= and >> operators down to the
function call notation and suddenly everithing lost its magic because it
becomes clear that a haskell monad is a sugarization of plain functional
tricks.
Yep.
But, BTW
I've been running around the gtk2hs web site and can't seem to find the
actual code (I did find the cairo blog, with examples but no code).
Can some kind soul post a link ?
Thanks
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Recently we discussed Haskell and especially types in Russian part of
LiveJournal and of course we talk about STM.
My opponent gave me that link:
http://logicaloptimizer.blogspot.com/2010/06/so-microsofts-experiments-with-software.html
It says that performance with STM in Microsoft Research was m
Carter Schonwald writes:
> Hey All,
> when i build hdbc-mysql and then try to run some example code, i get the
> following error message:
>
> Loading package HDBC-mysql-0.6.3 ... can't load .so/.DLL for: mysqlclient
> (dlopen(libmysqlclient.dylib, 9): no suitable image found. Did find:
> /us
This + 1 in (n1 + n2 + 1) what is it doing there?
import Control.Parallel
nfib :: Int -> Int
nfib n | n <= 1 = 1
| otherwise = par n1 (pseq n2 (n1 + n2 + 1))
where n1 = nfib (n-1)
n2 = nfib (n-2)
BTW, same code can be found in "Seq no more:
-- Forwarded message --
From: Alberto G. Corona
Date: 2010/8/8
Subject: Re: [Haskell-cafe] Is there any experience using Software
Transactional Memory in substantial applications?
To: Serguey Zefirov
This first papers is the first that describes the preliminary haskell
implement
On Sat, 07 Aug 2010 10:52:57 +0200, Axel Huizinga wrote:
I run into problems using shared libs on windows.
The error messages I get looks like:
Could not find module `Data.List':
Perhaps you haven't installed the "dyn" libraries for package `base'?
Any ideas how to enable shared libs sys
Thank you very much. This is just the answer I needed.
2010/8/8 Alberto G. Corona :
>
>
> -- Forwarded message --
> From: Alberto G. Corona
> Date: 2010/8/8
> Subject: Re: [Haskell-cafe] Is there any experience using Software
> Transactional Memory in substantial applications?
> T
> My opponent gave me that link:
http://logicaloptimizer.blogspot.com/2010/06/so-microsofts-experiments-with-software.html
I enjoy the article you linked but I sort of skimmed it because it was a
little boring, however its main point seem to be:
1. Ghostbusters.
2. Artificial intelligence is usel
On Sun, 8 Aug 2010 11:13:33 -0700
wrote:
> I've been running around the gtk2hs web site and can't seem to find
> the actual code (I did find the cairo blog, with examples but no
> code).
>
> Can some kind soul post a link ?
>
and here you go:
http://code.haskell.org/gtk2hs/cairo/demo/
__
2010/8/8 Johnny Morrice :
>> My opponent gave me that link:
> http://logicaloptimizer.blogspot.com/2010/06/so-microsofts-experiments-with-software.html
>
> I enjoy the article you linked but I sort of skimmed it because it was a
> little boring, however its main point seem to be:
>
> 1. Ghostbuster
I reported a seg-fault in chart a while back.
so I was experimenting with cairo and rendering to to the screen, which
if my understanding is correct, uses gtk. Certainly looks like it.
So I compiled the cairo example Drawing.hs and that worked fine.
I then tried running the example from ghci, i
On Sun, Aug 8, 2010 at 6:09 PM, Serguey Zefirov wrote:
> "Except that we have to write real apps" is a real gem of that conversation.
> ;)
So this Anders guy bashes functional languages and then says that
programmers should be encouraged to write functional code in OO
languages? Doesn't make an
On Aug 3, 2010, at 11:37 PM, Christopher Witte wrote:
> On 3 August 2010 01:34, Richard O'Keefe wrote:
> There's a thing I'm still finding extremely hard about monads,
> and that's how to get into the frame of mind where inventing
> things like Monad and Applicative and Arrows is something I cou
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 8/8/10 19:28 , Richard O'Keefe wrote:
> On Aug 3, 2010, at 11:37 PM, Christopher Witte wrote:
>> Maybe looking at Sigfpe's blog post You Could Have Invented Monads! (And
>> Maybe You Already Have.) will help.
>
> Notice the tense, "could have". I
Which ghc version?
It's have a bug in ghc-6.12 that cause gtk2hs segment fault.
If you use other ghc version, you should use gdb run your program to get
backtrace, then we can help you.
Cheers,
-- Andy
writes:
> I reported a seg-fault in chart a while back.
>
> so I was experimenting with
On 9 August 2010 09:44, Andy Stewart wrote:
> Which ghc version?
>
> It's have a bug in ghc-6.12 that cause gtk2hs segment fault.
If memory serves, that bug was only present in 6.12.2...
--
Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com
IvanMiljenovic.wordpress.com
Ivan Lazar Miljenovic writes:
> On 9 August 2010 09:44, Andy Stewart wrote:
>> Which ghc version?
>>
>> It's have a bug in ghc-6.12 that cause gtk2hs segment fault.
>
> If memory serves, that bug was only present in 6.12.2...
Yes, typo, it's a bug of ghc-6.12.2
-- Andy
__
Hello,
I'm sorry if this has already been posted.
http://www.galois.com/blog/2010/05/27/tech-talk-categories-are-databases/
Vasili
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Date: Sun, 8 Aug 2010 11:13:33 -0700
From:
Subject: [Haskell-cafe] cairo rendered to screen examples
To: haskell-cafe@haskell.org
Message-ID: <20100808111333.44b5f...@windy.deldotd.com>
Content-Type: text/plain; charset=US-ASCII
I've been running around the gtk2hs web site and can't seem to fi
On Mon, 09 Aug 2010 11:09:40 +0800
Andy Stewart wrote:
> Ivan Lazar Miljenovic writes:
>
> > On 9 August 2010 09:44, Andy Stewart
> > wrote:
> >> Which ghc version?
> >>
The Glorious Glasgow Haskell Compilation System, version 6.12.1
So just run gdb on ghci to see what is happening ?
Brian
Alberto G. Corona wrote:
But it seems that the trick is so productive because it comes from some
fundamental properties of math, the reality, and maybe the human mind . Jost
now I found this article:
Categorial Compositionality: A Category Theory Explanation for the
Systematicity of Human
Cognit
Alexander Dunlap wrote:
CaSSius and JSaesar?
+1 for Cassius.
--
Live well,
~wren
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On Fri, Aug 6, 2010 at 5:58 PM, Alex Stangl wrote:
> On Fri, Aug 06, 2010 at 10:17:26AM -0500, aditya siram wrote:
>> >From my vantage point they are (in no particular order) : Reader, Writer,
>> State, IO, ST, STM, Parsec (have I missed any?) and of course the
>> transformer versions. I am debati
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