Oh yes, having newly been using C++ at work, I realized they were a big
something [1] that enabled you, as it were, to do whatever unstructured
unholy type trickery you want, and yes, even making classes AB and AC
completely different things. (BUT! We could argue over this fact: Isn't it
also one
On 10/06/2011, at 6:00 PM, Yves Parès wrote:
Oh yes, having newly been using C++ at work, I realized they were a big
something [1] that enabled you, as it were, to do whatever unstructured
unholy type trickery you want, and yes, even making classes AB and AC
completely different things.
Curious observation:
Object languageType language
OO (C++)functional
functional (Haskell)logical
It makes me wonder what comes next...
To be more accurate, it was Functional Dependencies that introduced a logic
programming language to the type
Hi,
bri...@aracnet.com wrote:
Currently debian stable installs ghc 6.12.1.
Is there any reason you're not using say Debian testing? The
Debian Haskell Group (of which I am one of the less active
members) is doing a magnificent job in bringing Haskell
packages to Debian in the form of proper
On 10 June 2011 06:43, Richard O'Keefe o...@cs.otago.ac.nz wrote:
On 10/06/2011, at 1:11 AM, Erik Hesselink wrote:
On Thu, Jun 9, 2011 at 13:40, Neil Davies semanticphilosop...@gmail.com
wrote:
Anyone out there got an elegant solution to being able to fork a haskell
thread and replace
Hi,
Am Freitag, den 10.06.2011, 17:24 +1000 schrieb Erik de Castro Lopo:
Is there any reason you're not using say Debian testing? The
Debian Haskell Group (of which I am one of the less active
members) is doing a magnificent job in bringing Haskell
packages to Debian in the form of proper
forever a = a forever a
doesn't tie to itself without optimisations, so my guess is that it gets
expanded when you run/eval/execState it in ghci, building the thunk
a a a a ...
If you define
forever' a = let a' = a a' in a'
the variant using forever' runs in constant space in ghci.
I'm wondering what the best way to maintain
the latest ghc while using debian stable.
here's what I usually do:
* install ghc from binary package,
* build haskell-platform from source.
* when necessary, get more recent haskell packages via cabal
J.W.
Hi Brian,
Currently debian stable installs ghc 6.12.1.
Testing also doesn't have the new ghc. Here's how I do it:
I have a prefix $HOME/local/haskell, where I installed the ghc binaries
(downloadable at the ghc main site.) Just use ./configure
--prefix=$HOME/local/haskell. Then use the same
On Thu, Jun 9, 2011 at 11:31 AM, Max Bolingbroke batterseapo...@hotmail.com
wrote:
If you want plain text serialization, writeFile output.txt . show
and fmap read (readFile output.txt) should suffice...
Max
This code works:
main = do
let xss = [[1,2,3],[4,5,6],[7,8],[9]]
On Friday 10 June 2011, 13:49:23, Dmitri O.Kondratiev wrote:
On Thu, Jun 9, 2011 at 11:31 AM, Max Bolingbroke
batterseapo...@hotmail.com
wrote:
If you want plain text serialization, writeFile output.txt . show
and fmap read (readFile output.txt) should suffice...
Max
This code
On Fri, Jun 10, 2011 at 4:13 PM, Daniel Fischer
daniel.is.fisc...@googlemail.com wrote:
On Friday 10 June 2011, 13:49:23, Dmitri O.Kondratiev wrote:
On Thu, Jun 9, 2011 at 11:31 AM, Max Bolingbroke
batterseapo...@hotmail.com
wrote:
If you want plain text serialization, writeFile
Dmitri O.Kondratiev doko...@gmail.com writes:
xss2 - read `fmap` readFile output.txt
Two questions:
1) Why to use 'fmap' at all if a complete file is read in a single line of
text?
Because it's not 'map', it's more generalized. So the argument ('read'
here) is applied to whatever is
On Friday 10 June 2011, 14:25:59, Dmitri O.Kondratiev wrote:
Two questions:
1) Why to use 'fmap' at all if a complete file is read in a single line
of text?
Well, it's a matter of taste whether to write
foo - fmap read (readFile bar)
stuffWithFoo
or
text - readFile bar
let
Thanks for the excellent explanation! :
On Fri, Jun 10, 2011 at 4:49 PM, Daniel Fischer
daniel.is.fisc...@googlemail.com wrote:
On Friday 10 June 2011, 14:25:59, Dmitri O.Kondratiev wrote:
Two questions:
1) Why to use 'fmap' at all if a complete file is read in a single line
of text?
Alexander V Vershilov wrote:
I'm writing a small tcp server with that can handle connections and
answer by rules writen in a small script that can be interpreted by server.
For this purpose I've written an interpreter that has type
ErrorT MyError (StateT ScriptState IO)
so I can call native
Just for the culture (because Heinrich's solution is undoubtly simpler) you
can also achive this using continuations.
This is one of the purposes of the Cont monad, used jointly with a State
monad, you can store the continuations and resume them later.
2011/6/10 Heinrich Apfelmus
On Fri, 2011-06-10 at 09:51 +, Johannes Waldmann wrote:
here's what I usually do:
* install ghc from binary package,
* build haskell-platform from source.
* when necessary, get more recent haskell packages via cabal
Yes, this is definitely the way to go. You want to have the Haskell
On Thu, Jun 9, 2011 at 4:04 PM, Alexander V Vershilov
alexander.vershi...@gmail.com wrote:
Hello.
Thu, Jun 09, 2011 at 01:40:51PM -0500, Antoine Latter wrote
On Thu, Jun 9, 2011 at 3:14 PM, Alexander V Vershilov
alexander.vershi...@gmail.com wrote:
Hello.
I'm writing a small tcp server
ACM SIGPLAN Workshop on ML
Sunday, 18 September 2011, Tokyo, Japan (co-located with ICFP)
http://conway.rutgers.edu/ml2011/
CALL FOR CONTENT
The ML family of programming languages includes dialects known as
Standard ML, Objective Caml, and F#. These languages have inspired
a large amount of
Please help to find pre-compiled binary libraries of Gtk+ for Win32.
Gtk2Hs insatll instructions at:
http://code.haskell.org/gtk2hs/INSTALL
tells us:
[quote]
Building on Windows
Installation on Windows is nearly as easy as on Unix platforms. However, you
need to download
On Fri, Jun 10, 2011 at 00:36, Richard O'Keefe o...@cs.otago.ac.nz wrote:
The point is that they *could* have. The fact that they do not has
nothing whatever to do with UNIX. It was a Haskell design decision.
I have this feeling you're looking at it backwards... The question
was whether GHC
I am trying to install HaskellCharts at:
http://dockerz.net/twd/HaskellCharts
Running:
cabal update
cabal install gtk2hs-buildtools
cabal install gtk
cabal install chart
goes well untill 'cabal install chart' which results in:
C:\wks\RCAcabal install chart
Resolving
Hi
Below is a class that I wish to create some instances of.
I do not wish to change the class definition.
It is supposed to represent containers of type x that contain things of
type y.
My attempt at the insert function seems ok for Char and lists, but not
ok for Integer. How do I instantiate
On Friday 10 June 2011, 17:51:34, Dmitri O.Kondratiev wrote:
Configuring cairo-0.12.0...
setup.exe: The program pkg-config version =0.9.0 is required but it
could not be found.
You need the (non-Haskell) programme pkg-config, you should be able to get
it from e.g.
Hi,
http://www.gtk.org/download/win32.php
http://www.gtk.org/download/win64.php
search for all-in one bundle.
2011/6/10 Dmitri O.Kondratiev doko...@gmail.com:
Please help to find pre-compiled binary libraries of Gtk+ for Win32.
Gtk2Hs insatll instructions at:
Hi,
You forgot to install gtk2hs-buildtools, it includes pkg-config.
2011/6/10 Dmitri O.Kondratiev doko...@gmail.com:
I am trying to install HaskellCharts at:
http://dockerz.net/twd/HaskellCharts
Running:
cabal update
cabal install gtk2hs-buildtools
cabal install gtk
On Fri, 10 Jun 2011 17:28:22 +0100, Patrick Browne patrick.bro...@dit.ie
wrote:
-- Not OK
-- insert 2 [9,2]
This causes an error, because numeric literals like 2 are polymorphic:
:t 2
2 :: Num a = a
If you fix the type to Integer, it works as expected:
insert (2 :: Integer) [9,2]
By the
On 10/06/2011 01:44 AM, Jason Dagit wrote:
On Thu, Jun 9, 2011 at 2:06 PM, Andrew Coppin
andrewcop...@btinternet.com wrote:
Too bad GHC doesn't support inline assembly yet... (Or does it? I know it
supports inline Core now.)
Really? I found this in the manual so I think either the docs
Fri, Jun 10, 2011 at 03:27:44PM +0200, Heinrich Apfelmus wrote
Alexander V Vershilov wrote:
I'm writing a small tcp server with that can handle connections and
answer by rules writen in a small script that can be interpreted by server.
For this purpose I've written an interpreter that
It's worth mentioning 'foreign prim' is still a bit different from
inline code - while you can certainly write Cmm and have GHC link it
into your program, it is not really inline. GHC has two different
kinds of primitive operations: inline primops, and out of line
primops. foreign primops are
On Thu, Jun 9, 2011 at 6:04 PM, Felipe Almeida Lessa felipe.le...@gmail.com
wrote:
Something like this?
equivalenceClosure = fix $ \f e -
let e' = reflexivity . symmetry . transitivity $ e
in if e' == e then e else f e'
Cheers,
--
Felipe.
I managed something even clearer. I
On Fri, Jun 10, 2011 at 12:05 PM, Alexander Solla alex.so...@gmail.comwrote:
On Thu, Jun 9, 2011 at 6:04 PM, Felipe Almeida Lessa
felipe.le...@gmail.com wrote:
Something like this?
equivalenceClosure = fix $ \f e -
let e' = reflexivity . symmetry . transitivity $ e
in if e' == e
Trying to install the same stuff on Mac OS X 10.6.7 I get problems both with
gtk2hs-buildtools and pkg-config, (see below).
Any ideas where to get pre-built glib and pkg-config both for Win32 and Mac
OS X?
== Problems on Mac OS X with gtk2hs-buildtools :
cabal install gtk
Resolving
On Fri, 10 Jun 2011, Dmitri O.Kondratiev wrote:
/var/folders/Bo/BobN2Ap5GZW51e9o-n2Ack+++TI/-Tmp-/cairo-0.12.04207/cairo-0.12.0/Gtk2HsSetup.hs:201:69:
Couldn't match expected type `PackageDBStack'
against inferred type `PackageDB'
In the sixth argument of `registerPackage',
On Sat, Jun 4, 2011 at 1:56 AM, Ivan Lazar Miljenovic
ivan.miljeno...@gmail.com wrote:
On 4 June 2011 07:11, Dmitri O.Kondratiev doko...@gmail.com wrote:
So, if I got this right, I should run:
'cabal install -fbuildExamples gnuplot'
from gnuplot source root folder?
You can either get
Somehow in the distant past I managed to get vi editing mode working
for ghci on ghc 6, but when I upgraded to ghc 7, I can't seem to
figure out how to enable it anymore. I think I might have been using
ghci-haskeline in the past. A post I read somewhere suggested that
ghc 7 should have innate
On Fri, Jun 10, 2011 at 1:25 PM, David McBride dmcbr...@neondsl.com wrote:
Somehow in the distant past I managed to get vi editing mode working
for ghci on ghc 6, but when I upgraded to ghc 7, I can't seem to
figure out how to enable it anymore. I think I might have been using
ghci-haskeline
I do remember reading this page way back when. Thank you very much!
On Fri, Jun 10, 2011 at 4:41 PM, Evan Laforge qdun...@gmail.com wrote:
On Fri, Jun 10, 2011 at 1:25 PM, David McBride dmcbr...@neondsl.com wrote:
Somehow in the distant past I managed to get vi editing mode working
for ghci
FWIW, what you have written is equivalent to
equivalenceClosure = fix (const (reflexivity . symmetry . transitivity))
and because the fixed point of `const a` is `a`,
equivalenceClosure = reflexivity . symmetry . transitivity
which obviously only performs a single pass on its input
On Fri,
On Sat, 11 Jun 2011, Dmitri O.Kondratiev wrote:
That's what I get (see below). What else should I do to install gnuplot?
~/wks/haskell-wks/gnuplot/gnuplot-0.4.2/srcghc -v Demo.hs
Do you really want to compile the Demo (with ghc)? It is already compiled
if 'cabal install -fbuildExamples'
On Sat, Jun 11, 2011 at 12:54 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
On Sat, 11 Jun 2011, Dmitri O.Kondratiev wrote:
That's what I get (see below). What else should I do to install gnuplot?
~/wks/haskell-wks/gnuplot/gnuplot-0.4.2/srcghc -v Demo.hs
Do you really
You can also modify you class if your intent is that it always work with
polymorph types (And it will save you some trouble with functional
dependencies between types x and y. Plus, it will be Haskell98 compliant)
-- insert, remove and whatsIn are then supposed to work *forall y*, and then
impose
I am looking for platform-independent library to generate simple histograms
in png format.
Does such thing exist?
Thanks!
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You can also get vim-addon-async [1] and run ghci
inside Vim. Then you can use all Vim goodness.
[1]: requires client-server. Tested on Linux and Mac
http://github.com/MarcWeber/vim-addon-async
Marc Weber
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On Sat, 11 Jun 2011, Dmitri O.Kondratiev wrote:
Yes, you did, thanks. Yet, please allow me to ask a few more questions here,
before I subscribe to gnuplot list. I am really
short on time - must have some plots for demo next Monday (
1) Can current version of gnuplot draw histograms? I need
Hi, Dmitri,
here is newer guide, with updated links:
http://deltadiaz.blogspot.com/2011/03/on-windows-how-to-install-gtk.html
Hope it helps!
On Fri, Jun 10, 2011 at 5:30 PM, Dmitri O.Kondratiev doko...@gmail.comwrote:
Please help to find pre-compiled binary libraries of Gtk+ for Win32.
Should I abandon the ghc debian package and install the haskell-platform ?
Should I simply build ghc 7.0 independently ?
This is the way I went; I installed the latest ghc from source, then
haskell-platform from source. Works a treat!
Arlen
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I've never seen such an easy description in Haskell books.
Is there more going on with Haskell functors?
--
--
Regards,
KC
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On Fri, 2011-06-10 at 19:53 -0700, KC wrote:
I've never seen such an easy description in Haskell books.
Is there more going on with Haskell functors?
You could make an analogous statement by saying that Haskell functors
produce and consume types... but we don't, because that's a much more
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