Hi Mark
What style of Stream programming do you have in mind? In Haskell
there can be at least four styles of Stream programming depending how
you count:
There is the stream as infinite-list - see Wouter Swierstra's
Data.Stream on Hackage and if you have university affiliation look for
the paper
Hi Oscar,
On Sat, May 15, 2010 at 22:19, Oscar Finnsson oscar.finns...@gmail.comwrote:
(...)
I guess my questions are:
1. Is it possible to combine GADTs with Scrap your Boilerplate?
Your GADT encodes an existential datatype. The closest attempt to encode
existential types in (something
On Sun, May 16, 2010 at 2:34 AM, Tom Hawkins tomahawk...@gmail.com wrote:
I got the GADT
data DataBox where
DataBox :: (Show d, Eq d, Data d) = d - DataBox
[snip]
but I can't figure out how to implement gunfold for DataBox.
The error message is
Text/XML/Generic.hs:274:23:
On Thu, May 13, 2010 at 8:13 PM, wren ng thornton w...@freegeek.org wrote:
Andrea Vezzosi wrote:
On Thu, May 13, 2010 at 10:51 AM, wren ng thornton w...@freegeek.org
wrote:
Andrea Vezzosi wrote:
wren ng thornton wrote:
With this change [1] I can't notice any difference for your
On Fri, 14 May 2010, Derek Elkins wrote:
You did it wrong. All you did was Church encode the Either type.
Your bind is still doing a case-analysis. All you have to do is use
ContT r (Either e). The bind implementation for ContT is completely
independent of the underlying monad. It doesn't
On 16/05/2010, at 10:17, Pierre-Etienne Meunier wrote:
I've also just noticed a lack in the vector library : multidimensional arrays
seem to require indirections like in caml, whereas in C or in Data.Ix, there
is a way to avoid this. This is especially important for avoiding cache
misses
On 16/05/2010, at 11:54, Mark Wassell wrote:
Hi,
This possibly might go against the spirit of what Stream programming is about
but I having difficulties converting an imperative algorithm [1] into Haskell
and think it would be easier if I was able to write it in a monadic style
with
Brent Yorgey wrote:
I am very pleased to announce that Issue 16 of The Monad.Reader is now
available [1].
Issue 16 consists of the following three articles:
* Demand More of Your Automata by Aran Donohue
* Iteratee: Teaching an Old Fold New Tricks by John W. Lato
* Playing
executeFile is failing for me on Mac OS X 10.5.8, with ghc 6.12.1 when
compiling with -threaded. Compiling without -threaded, or running on
linux is fine.
When compiled with -threaded, the following snippet produces the error:
testProg: /bin/echo: executeFile: failed (Operation not supported)
Hello David,
Sunday, May 16, 2010, 7:18:29 PM, you wrote:
executeFile is failing for me on Mac OS X 10.5.8, with ghc 6.12.1
when compiling with -threaded. Compiling without -threaded, or running on
linux is fine.
forkProcess $ executeFile /bin/echo False [Ok] Nothing
afair, forkProcess
Hello all!
Can somebody please explain wha am I doing in wrong way?
===
module UrlEncode where
import System
import Codec.Binary.UTF8.String as SU
import Codec.Binary.Url as U
import Data.Maybe
main :: IO ()
main = do
args -
* Eugene Dzhurinsky b...@redwerk.com [2010-05-16 18:42:08+0300]
Hello all!
Can somebody please explain wha am I doing in wrong way?
[snip]
I am getting the output:
===
1) 345 =K=G5 4= 1...@0bl :=86:8 2 2845 FB2?
2) :0:9
On Sun, May 16, 2010 at 06:56:58PM +0300, Roman Cheplyaka wrote:
I assume you are using GHC 6.12. The trouble is in conversion done by
putStrLn. Use one from System.IO.UTF8.
Or try to upgrade to GHC 6.12 which respects the locale settings.
Hello, Roman!
Thank you very much for the hint, it
You are quite right that vector only supports nested arrays but not
multidimensional ones. This is by design, however - the library's only goal
is to provide efficient one-dimensional, Int-indexed arrays. I'm thinking
about how to implement multidimensional arrays on top of vector but it's
On Sunday 16 May 2010 18:13:30, Eugene Dzhurinsky wrote:
On Sun, May 16, 2010 at 06:56:58PM +0300, Roman Cheplyaka wrote:
I assume you are using GHC 6.12. The trouble is in conversion done
by putStrLn. Use one from System.IO.UTF8.
Or try to upgrade to GHC 6.12 which respects the locale
On May 16, 2010, at 4:51 AM, Roman Leshchinskiy wrote:
You are quite right that vector only supports nested arrays but not
multidimensional ones. This is by design, however - the library's only goal
is to provide efficient one-dimensional, Int-indexed arrays. I'm thinking
about how to
Eventually, I don't think it is a profiling issue.
Maybe a problem with integral. According to a quite recent post on the
reactive mailing list, the following minimal code produces the same problem
:
import FRP.Reactive
import FRP.Reactive.LegacyAdapters
import Control.Applicative
type
As far as I know, it was never possible to make a pong game in
Reactive, at least not with the versions I tried, but I admit a lot of
never versions got released since then. It would be great to see one
though :)
You might want to try Yampa, that works for sure (although you should
mark all your
Roman Leshchinskiy wrote:
On 16/05/2010, at 11:54, Mark Wassell wrote:
Hi,
This possibly might go against the spirit of what Stream programming is about
but I having difficulties converting an imperative algorithm [1] into Haskell
and think it would be easier if I was able to write it
Why isn't it possible to make a Pong with Reactive? Where is the problem?
Conceptually, I don't see where it is. IMO, it's a time-leak issue due to a
Reactive bug, but it is not a limitation of Reactive.
I mean, it's not that it *can't* work, it's that it *should* work, shouldn't
it?
And why
Pierre-Etienne Meunier wrote:
I was also wondering about how to do linear algebra : an infinite
number of types would be needed to express all the constraints on
matrix multiplication : we need types such as array of size m * n.
Is there a way to generate these automatically
This is already
Yes, it would be very nice to actually pinpoint why this can't be
done. Is it a bug, is it a design flaw, ... I'm just saying that I'm
not aware of a working Pong game in Reactive. Well actually, someone
did make a Tetris game with it once...
Intuitively I would say Reactive gives the programmer
On Mon, May 17, 2010 at 1:33 AM, Bulat Ziganshin
bulat.zigans...@gmail.comwrote:
Hello David,
Sunday, May 16, 2010, 7:18:29 PM, you wrote:
executeFile is failing for me on Mac OS X 10.5.8, with ghc 6.12.1
when compiling with -threaded. Compiling without -threaded, or running
on linux is
Works fine on 10.6.3. If you run with +RTS -N2, though, you'll get
forking not supported with +RTS -Nn greater than 1
The reason for this is that forking won't copy over the threads which
means that the Haskell IO manager stops working (you'd have to somehow
reinitialise the RTS while leaving
Hi.
I'm a Haskell newbie and there's a bit of Haskell code that I don't
understand how it works. In the prelude, defining the class Show, the
function showList is implemented twice, one for String and another one
for other lists:
showList cs = showChar '' . showl cs
where
On May 15, 2010, at 5:40 AM, Daryoush Mehrtash wrote:
the speaker talks about F# on .Net platform. Early on in the talk
he says that they did F# because haskell would be hard to make as
a .Net language.Does anyone know what features of Haskell make
it difficult as .Net language?
Indeed System.Process does work for me. I had avoided it because it is a
little more awkward to use it when you want the actual PIDs. I don't
understand why System.Process.runProcess works for me, but executeFile does
not. I did find this issue (for python)
http://bugs.python.org/issue6800which
On 17 May 2010 12:56, Abby Henríquez Tejera parad...@gmail.com wrote:
I'm a Haskell newbie and there's a bit of Haskell code that I don't
understand how it works. In the prelude, defining the class Show, the
function showList is implemented twice, one for String and another one
for other
CIL [1] is an OCaml library that parses and compiles C down to a
simplified subset to ease different forms of static analysis. Frama-C
[2] augments CIL with a property specification language (ACSL), which
can capture design contracts for C functions. Frama-C's Jessie plugin
uses the Why [3]
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