| Is there any chance there is a bug in recent GHCs (or perhaps Linux?)
| affecting this? I'm fairly sure I've lately seen Haskell programs
| consuming significantly larger amounts of memory than they should be
| allowed to, and I can try to isolate a test case if it is of
| interest.
New bugs
On 12/19/05, Andrew Pimlott [EMAIL PROTECTED] wrote:
[It is best to post questions only to haskell-cafe.]
Roger.
On Mon, Dec 19, 2005 at 03:53:53PM +1300, Karl Grapone wrote:
I'm having trouble making use of MonadError within another Monad, in
this case IO.
snip
Looking at the signature
Am Sonntag, 18. Dezember 2005 17:25 schrieb Daniel Carrera:
[...]
This is a real problem for Haskell. I expect that a lot of people try
Haskell and give up because they can't even write the simplest function.
Hello Daniel,
honestly, I have to say that during my years with Haskell, this seems
Am Sonntag, 18. Dezember 2005 17:42 schrieb Daniel Carrera:
Lemmih wrote:
GHC is a compiler. If you want to compile to a binary then you must
define a function called 'main'. Otherwise just load the file in ghci
(`ghci fac.hs`).
I would expect GHC to be able to compile a program with a
Daniel is right, by definition. He is a new user. He had difficulty.
That much is incontrovertible.
While he may seem unusual, perhaps he is only unusual in that he's told
us about his experience rather than trying Perl instead. For which,
much thanks, Daniel!
In any case, I think it'd be
Am Sonntag, 18. Dezember 2005 18:04 schrieb Daniel Carrera:
Joel Koerwer wrote:
Then after you've played with you creation a bit, check out
http://haskell.org/learning.html http://haskell.org/learning.html
Thank you. I did find that page, and it was very easy to find.
There's a link on the
Wolfgang Jeltsch wrote:
In addition, Haskells requirement of a main variable is nothing new.
Certainly nothing new. I just wish that the documentation I read had
told me about it.
`ghci fac.hs` doesn't give any errors. I don't understand why loading
the file like that is ok but typing the
Wolfgang Jeltsch wrote:
The problem is that the content of that page, and its links, didn't show me
how to write a Haskell program (like you did).
If you want to know how to feed, for example, Hugs with your Haskell program,
you might have to have a look at some Hugs documentation. Remember
Am Sonntag, 18. Dezember 2005 18:02 schrieb Daniel Carrera:
Chris Kuklewicz wrote:
Almost everything is explained under
http://www.haskell.org/ghc/docs/6.4.1/html/users_guide/ghci.html
Ok. How would a visitor to the Haskell site find this document?
The point is that the visitor should
Am Montag, 19. Dezember 2005 01:10 schrieb Jared Updike:
Int is for bounded values -2**32 to 2**32 (I think... maybe 2**-31 and
2**31 or less if it's boxed?) based on the underlying machine
representation.
Not really true. As far as I remember, the Haskell Report just says that Int
covers at
On Mon, Dec 19, 2005 at 10:14:07AM +, Daniel Carrera wrote:
Wolfgang Jeltsch wrote:
If you want to know how to feed, for example, Hugs with your Haskell
program, you might have to have a look at some Hugs documentation.
Remember that different Haskell implementations like Hugs, GHCi
Wolfgang Jeltsch wrote:
The point is that the visitor should know that he/she might need a document
about GHCi if he/she wants to use GHCi. A introductionary document about
Haskell might not explain a specific Haskell system. If you read a book
which is about C++ in general, it won't tell
Tomasz Zielonka wrote:
I think what Wolfgang meant was that different Haskell implementations
may have:
- different executable names, so you have to invoke them differently
- different options
- different style of work
etc...
Of course, all of them should accept all Haskell 98 programs.
Ah.
Simon P-J:
Daniel is right, by definition. He is a new user. He had difficulty.
That much is incontrovertible.
While he may seem unusual, perhaps he is only unusual in that he's told
us about his experience rather than trying Perl instead. For which,
much thanks, Daniel!
Actually, I have
| Actually, I have sometimes wished that the various interactive Haskell
| interfaces had the possibility to enter also declarations interactively
GHCi does.
ghci let f x = hello
ghci f True
True
But there's no editor -- it's strictly a one-line definition
Simon
| -Original Message-
Am Montag, 19. Dezember 2005 12:13 schrieb Daniel Carrera:
[...]
I guess that Haskell is unique among interpreted languages
Haskell is not an interpreted language. There are Haskell interpreters,
there are Haskell compilers.
in that there are two compilers and they work different.
The
Simon:
Me:
| Actually, I have sometimes wished that the various interactive Haskell
| interfaces had the possibility to enter also declarations interactively
GHCi does.
Ah, I see! Does it open a let-environment with a local definition?
ghci let f x = hello
ghci f True
True
Hmm, an interesting
GCCXML defines some XML schema for the results of a C(++) program
parsing. Does there exist any agreed-upon XML schema to represent the
results of Haskell program parsing?
Thanks.
--
Dimitry Golubovsky
Anywhere on the Web
___
Haskell-Cafe mailing list
Simon Peyton-Jones [EMAIL PROTECTED] writes:
In any case, I think it'd be great if he, or anyone else, started a Wiki
page on very first steps in Haskell, along the lines he suggests.
Maybe one exists already? Once it does, it'd be good to point to it
from haskell.org.
There's both
[reposted from haskell mailing list where I got no bites :) ]
Folks,
I'm new to using monads, and I'd like some help improving a function
definition that I wrote and which works, but for which I think there
should be a clearer way to write it.
What I'm after is something like:
-- (psuedo-code)
On Mon, Dec 19, 2005 at 10:21:36PM +1300, Karl Grapone wrote:
I still find monadic signatures a little confusing, I believe ghci
was, at some point, deriving types for f or g that had MonadError in
place of Either String, so I'll have to think carefully about why it
is so different from the
Hello all,
Playing around with Haskell... I'm writing a 'choose' function:
--//--
fac :: Int - Int
fac 0 = 1
fac n = n*fac(n-1)
choose :: Int - Int - Int
choose n k = fac(n) / (fac(k) * fac(n-k))
--//--
I'm having problems with the last line.
--//--
Prelude :l test.hs
Compiling Main
Okay...that works. Sweet.
gdc x = ListT $ getDirectoryContents x
get3levels top = runListT $ do
b - gdc top
c - gdc $ top++('/':b)
d - gdc $ top++('/':b)++('/':c)
return (b,c,d)
I feel bound to point out http://haskell.org/hawiki/ListTDoneRight which
has more to say about the details
On Monday 19 December 2005 12:13, Daniel Carrera wrote:
Wolfgang Jeltsch wrote:
* There's no way for a new user to figure out how to successfully
run the simplest Haskell program.
There is! The Hugs 98 User's Guide and The GHC User's Guide.
Okay, I stand corrected. I rephrase the
Greg Buchholz wrote:
Integral division is spelled div...
Thanks, that worked.
The course material on the website uses a /. See the second link
from the top, English notes. On page 5, right at the bottom. This course
material teaches Gofer which it claims is essentially a subset of
On Monday 19 December 2005 11:26, Wolfgang Jeltsch wrote:
Am Montag, 19. Dezember 2005 01:10 schrieb Jared Updike:
Int is for bounded values -2**32 to 2**32 (I think... maybe 2**-31
and 2**31 or less if it's boxed?) based on the underlying machine
representation.
Not really true. As far
On 12/19/05, Chris Kuklewicz [EMAIL PROTECTED] wrote:
Okay...that works. Sweet.
gdc x = ListT $ getDirectoryContents x
get3levels top = runListT $ do
b - gdc top
c - gdc $ top++('/':b)
d - gdc $ top++('/':b)++('/':c)
return (b,c,d)
Yeah, that's awesome: just as readable as the
OOn Mon, 19 Dec 2005 10:50:00 +0100, Wolfgang Jeltsch
[EMAIL PROTECTED] wrote:
Am Sonntag, 18. Dezember 2005 17:25 schrieb Daniel Carrera:
[...]
This is a real problem for Haskell. I expect that a lot of people try
Haskell and give up because they can't even write the simplest function.
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