I have been keeping up with this thread. As a user of Haskell for
comercial purposes, I can say that it does what I want. The only
thing currently on my wish-list is some sort of run time debuging.
(sometimes you want to know how you got to the empty list that you
took the head of :) Anyhow, I
On Thu, Dec 14, 2006 at 03:03:51AM -0500, Mark Goldman wrote:
I have been keeping up with this thread. As a user of Haskell for
comercial purposes, I can say that it does what I want. The only
thing currently on my wish-list is some sort of run time debuging.
(sometimes you want to know how
If I remember my EWD's[1] right, whether or not composing music is similar
to writing programs was not Dijkstra's point. I paraphrase (possibly from
another EWD, can't be bothered to look it up):
Computers, in their capacity as a tool, are highly overrated.
Dijkstra was referring to the
| The commented out signature is the signature that GHC infers for the
| function. When I uncomment that signature, it will no longer type
| check. Why does this happen? Even with the forall and the explicit
| signatures in the where clause, it chokes.
This very question is one that came up only
Hi
* Give tips on how to answer questions
+ Ok. we can put up an article here. Some suggestions:
- No questions are bad questions
- Code should come with examples of how to run it
- Solutions with unsafePerformIO should be
On Wed, 13 Dec 2006 17:18:31 +0100, Justin Bailey [EMAIL PROTECTED]
wrote:
On 12/12/06, Joachim Durchholz [EMAIL PROTECTED] wrote:
Agreed.
Something along the lines of The Art of Functional Programming.
+1 . I would love to read something that is the equivalent of 'design
patterns', but
Hi Walter,
Hi all. I was wondering if some people miss the colored output
of some applications, such like the IPython enhanced shell. I've
been googling for similar options for Haskell but I found nothing.
WinHugs already colours (to some degree) and hyperlinks error messages.
Another difference with music that strikes me is the
level of
abstraction : a note is a note. A line of code
(especially in a
imperative setting) is much more than a line of
code.
But this is exactly what semantics is about, or not?
It is the question, when you have a set of symbols or
I am sorry, I might have confused you. It appears that we have just a
function for doing what you want; in UU.Pretty.Basic there is a
function invisible. From the manual page I quote:
invisible ppd
Makes the formatted element invisible (all its attributes are
forgotten in order to always
On 12/13/06, Justin Bailey [EMAIL PROTECTED] wrote:
On 12/12/06, Joachim Durchholz [EMAIL PROTECTED] wrote:
Agreed.
Something along the lines of The Art of Functional Programming.
+1 . I would love to read something that is the equivalent of 'design
patterns', but for functional languages. I
+1 . I would love to read something that is the equivalent of 'design
patterns', but for functional languages.. I want to learn how to think
functionally.
If you want to learn how to think functionally, forget you ever
heard the words design pattern. There shouldn't be patterns in your
On 12/14/06, Neil Mitchell [EMAIL PROTECTED] wrote:
Hi
* Give tips on how to answer questions
+ Ok. we can put up an article here. Some suggestions:
- No questions are bad questions
- Code should come with examples of how to run it
Hello John,
Thursday, December 14, 2006, 6:13:56 AM, you wrote:
I'm now using existential types. I avoided learning about them because
the name sounded so highly technical and obscure it did not occur to me they
could be related to OO.
look at
Hallo,
On 12/14/06, Paul Moore [EMAIL PROTECTED] wrote:
But overall I'd agree, this is a very helpful community - it's just
that you all seem so much cleverer than I, so I'm not sure I'll ever
be smart enough to write Haskell programs :-) (50% joke...)
I know the feeling. :-)
--
-alex
From GHC documentation: Once profiling has thrown the spotlight on the
guilty time-consumer(s), it may be better to re-think your program than
to try all the tweaks listed below.
So, how should I rethink my program? Which way to take?
___
szefirov:
From GHC documentation: Once profiling has thrown the spotlight on the
guilty time-consumer(s), it may be better to re-think your program than
to try all the tweaks listed below.
So, how should I rethink my program? Which way to take?
Do you have some particular code that is
On Thu, Dec 14, 2006 at 10:16:10AM +, Neil Mitchell wrote:
I'd say our worst feature is tending to give solutions which are not
simple Haskell, but make use of advanced features. When a beginner
asks a question, sometimes the answer requires GADT's, Template
Haskell, rank-2 types etc.
Donald Bruce Stewart wrote:
szefirov:
From GHC documentation: Once profiling has thrown the spotlight on the
guilty time-consumer(s), it may be better to re-think your program than
to try all the tweaks listed below.
So, how should I rethink my program? Which way to take?
Do you
szefirov:
I profiled my program and found that residency looks pretty fixed but
program memory usage grows and eventually I get heap overflow (on
Windows) or heavy pagefile trashing (on Linux).
When I turn on +RTS -c to use heap compaction I immediately get the
following:
ke, 2006-12-13 kello 08:18 -0800, Justin Bailey kirjoitti:
On 12/12/06, Joachim Durchholz [EMAIL PROTECTED] wrote:
Agreed.
Something along the lines of The Art of Functional
Programming.
+1 . I would love to read something that is the equivalent of 'design
Hello szefirov,
Thursday, December 14, 2006, 5:24:11 PM, you wrote:
When I turn on +RTS -c to use heap compaction I immediately get the
following:
-
.exe: internal error: scavenge_mark_stack: unimplemented/strange
this bug was fixed at Nov 15 so you should
Hello szefirov,
Thursday, December 14, 2006, 4:18:37 PM, you wrote:
From GHC documentation: Once profiling has thrown the spotlight on the
guilty time-consumer(s), it may be better to re-think your program than
to try all the tweaks listed below.
So, how should I rethink my program?
Those are some great resources, thanks everyone!
Justin
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http://www.haskell.org/mailman/listinfo/haskell-cafe
[EMAIL PROTECTED] (Donald Bruce Stewart) wrote:
Currently, there is an existing tool, HsColour:
http://www.cs.york.ac.uk/fp/darcs/hscolour/
Here's a mockup (the result of dumping ghci's output through HsColour):
Have you tried just piping ghci through HsColour interactively?
ghci
Dear Haskellers --
Haskell.org will go down today at 1500 EST for about 10 minutes for a
memory upgrade.
Sorry for the inconvenience,
-Paul Hudak
___
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Here is the announce I've made today to the haskell-jvm-bridge mailing list:
http://sourceforge.net/mailarchive/forum.php?thread_id=31235407forum_id=8497
ghc-6.4.2 is currently the default version on both Linux and FreeBSD, so
i think it's recent enough. I'm only starting to experiment with
On 12/14/06, Ross Paterson [EMAIL PROTECTED] wrote:
Absolutely. Some more questions of this type:
How do I update a variable?
How can I efficiently update an array?
How do I get debugging output?
How can I put different types of things in a list?
Sometimes the
Brian Hulley wrote:
Yet I'm sure most people who did a computer science degree some decades ago
remember the old joke about passing things by name or value for what it's
Wirth... :-)
Wikipedia says:
“Whereas Europeans generally pronounce my name the right way ('Ni-klows Wirt'),
Americans
On Wed, Dec 13, 2006 at 12:17:08AM +0100, Joachim Durchholz wrote:
Haskell needs... bullet-proof compilers, all of this working right out
of the box. (I see that this all is being worked on.)
Come on, C++ got popular in spite of having NO bullet-proof, let alone
complete compilers. Two years
Tomasz Zielonka schrieb:
On Wed, Dec 13, 2006 at 12:17:08AM +0100, Joachim Durchholz wrote:
Haskell needs... bullet-proof compilers, all of this working right out
of the box. (I see that this all is being worked on.)
Come on, C++ got popular in spite of having NO bullet-proof, let alone
On Thu, Dec 14, 2006 at 09:56:57PM +0100, Joachim Durchholz wrote:
OK, there's the option of replacing working tools with hype.
It worked for C++, and it worked for Java.
Pity I don't have the slightest idea how to work up a hype for Haskell.
Who would want such a hype?
Why not simply start
Hi,
Am Donnerstag, den 14.12.2006, 21:56 +0100 schrieb Joachim Durchholz:
OK, there's the option of replacing working tools with hype.
It worked for C++, and it worked for Java.
Pity I don't have the slightest idea how to work up a hype for Haskell.
IMHO, three is already a haskell hype,
On Thu, 14 Dec 2006, Kirsten Chevalier wrote:
...
If you want to learn how to think functionally, forget you ever
heard the words design pattern. There shouldn't be patterns in your
programs. If there are, that means that either your language isn't
providing you with enough abstractions or
On 15/12/06, Nicolas Frisby [EMAIL PROTECTED] wrote:
... That's not to say it was the poster's fault: any question is
a good question.
I agree ...
2) The welcome to the mailing list message could say if you're
new to Haskell, please check this FAQ first. I'm talking big letters
here; I'd
Hello everyone,
I have been trying to run a Haskell program of mine that does an
extensive computation with very large amounts of data. I compiled the
program with ghc --make. When I run it it terminates after some time
with the message:
Stack space overflow: current size 8388608 bytes.
Use
On Dec 14, 2006, at 10:00 , Felix Breuer wrote:
3) I tried using +RTS -Ksize as suggested, but these options do not
seem to be passed through if I use --make. How can I use both, these
compilation flags and --make?
They aren't compile options; they're runtime options. The GHC
runtime
On Thu, Dec 14, 2006 at 04:00:53PM +0100, Felix Breuer wrote:
Hello everyone,
I have been trying to run a Haskell program of mine that does an
extensive computation with very large amounts of data. I compiled the
program with ghc --make. When I run it it terminates after some time
with the
On Thu, Dec 14, 2006 at 04:00:53PM +0100, Felix Breuer wrote:
Hello everyone,
I have been trying to run a Haskell program of mine that does an
extensive computation with very large amounts of data. I compiled the
program with ghc --make. When I run it it terminates after some time
with the
[EMAIL PROTECTED] (Donald Bruce Stewart) writes:
Can't we do something like this, on top of System.Process?
Do we need unix* stuff anymore?
Hi,
on my computer your code (with return ()-s inserted) works with at
most 135168=132*1024 bytes of input:
import System.Exit
import System.IO
i'm not naive enough to think they are the composition function, and
i've gathered it has something to do with free terms, but beyond that
i'm not sure. unless it also has something to do with fix points?
___
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On 12/14/06, Steve Downey [EMAIL PROTECTED] wrote:
i'm not naive enough to think they are the composition function, and
i've gathered it has something to do with free terms, but beyond that
i'm not sure. unless it also has something to do with fix points?
The points are the arguments. The
sdowney:
i'm not naive enough to think they are the composition function, and
i've gathered it has something to do with free terms, but beyond that
i'm not sure. unless it also has something to do with fix points?
The wiki knows all! :)
http://haskell.org/haskellwiki/Pointfree
1 But
On 14/12/06, Conrad Parker [EMAIL PROTECTED] wrote:
What [hackers] are, unapologetically, is hostile to people who seem to
be unwilling to think or to do their own homework before asking questions.
People like that are time sinks — they take without giving back, and they
waste time we
Here, I think an examples worth a thousand poierr, words. This one
comes from YAHT. Consider the two implementations of the following
function:
lcaseLetters :: String - String
lcaseLetters s = map toLower (filter isAlpha s)
lcaseLetters :: Strint - String
lcaseLetters = map toLower . filter
the wiki wasn't half as clear. other tham covering the first half,
that it doesn't mean the '.' function.
so pointsfree is a step beyond leaving the domain unspecified.
my reading knowledge of haskell at this point far exceeds my ability
to write haskell. but so far, it has seemed to me that
felix:
Hello everyone,
I have been trying to run a Haskell program of mine that does an
extensive computation with very large amounts of data. I compiled the
program with ghc --make. When I run it it terminates after some time
Did you compile with -O (optimisations). Sometimes this fixes
Hi
Did you compile with -O (optimisations). Sometimes this fixes things,
and its just good practice.
It's slower to compile, and might fix things in GHC Haskell, but other
compilers don't all have -O flags, so its generally best to make your
program at least have the right sort of time/space
The cabal setup recognises a small set of licences which I don't think
are well explained. I'm trying to put together a canonical list for
setting up new projects.
GPL: http://www.gnu.org/licenses/gpl.txt
LGPL: http://www.gnu.org/licenses/lgpl.txt
Thankfully the FSF are particularly anal^W
Nicolas Frisby wrote
The commented out signature is the signature that GHC infers for the
function. When I uncomment that signature, it will no longer type
check. Why does this happen? Even with the forall and the explicit
signatures in the where clause, it chokes.
Alas, this is the property
G'day all.
Quoting Steve Downey [EMAIL PROTECTED]:
from what you just told me, it's not an artifact of the pf style, but
that maximally reusable functions will be expressible in a pointsfree
style.
Not necessarily. (There's a fairly obvious reductio ad absurdum argument
as to why: at least
G'day all.
Quoting Donn Cave [EMAIL PROTECTED]:
Well, maybe not Patterns, but wouldn't there be important skills
relating to patterns in a more general sense? Like fold, for example,
seems to be a pattern, with several standard implementations and no
doubt countless others to suit
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