comp.lang.haskell Google Group

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mark.carr...@aetion.com (Mark T. B. Carroll) — Wed, 18 Лис 2009 18:29:07 UT

I wrote something that is possibly a bit horrifying. I seem to have got
away with it for now. I don't normally use things like unsafePerformIO
but it occurred to me that I could write a kind of transparent results
cache for functions. I'd certainly be interested in comments about how
I screwed it up or shouldn't even be thinking such awful things. At

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happs coming alone?

gavcom...@gmail.com (gavino) — Fri, 30 Жов 2009 04:51:35 UT

see this? [link] lisp has a nice webserver

monads for lambda calculus

jon.gallagher...@gmail.com (jon.gallagher.04) — Tue, 20 Жов 2009 05:04:28 UT

Greetings Comp.Lang.Haskell Community,
I have a program that serves a lambda calculus reducer, but I want to
play with it and see what various class representations give, such as
functors and monads.
So consider
Then, of course fold,
So that we can give an instance of functor,
Next we can try to write an instance of monads. We have an obvious

* extended deadline: FLOPS 2010: Last Call for Papers *

matthias.bl...@gmail.com (Matthias) — Tue, 20 Жов 2009 02:42:40 UT

------------------------------ ------------------------------ ----------------
LAST CALL FOR PAPERS
Tenth International Symposium on Functional and Logic Programming
(FLOPS 2010)
April 19-21, 2010
Sendai, Japan
[link]
** EXTENDED SUBMISSION DEADLINES **

Just beginning problem

e...@mountaincable.net (Chris Saunders) — Sat, 17 Жов 2009 21:52:52 UT

I am just beginning to learn Haskell. Just for starters I'm watching a
video lecture from Channel 9. The lecturer defines a function like this
"myadd (x,y) = x + y". When I enter this into GHCi I get the error message
":1:12: parse error on input `='". Could I get a simple explanation of
this?

Rational -> Double conversion?

fu...@hawaii.edu (Ryo) — Thu, 08 Жов 2009 09:57:43 UT

Hello Haskellers,
I'm a novice Haskell user. I'm wondering how to get an approximate
value in Double of a Rational. I'm doing a little numerical
calculation using Rational to avoid truncation error, but want the
final results printed as Doubles that approximate original Rationals.
(I need this to read the results in Fortran.)

* FLOPS 2010: Last Call for Papers *

matthias.bl...@gmail.com (Matthias) — Sat, 03 Жов 2009 02:42:10 UT

Logger monad

mark.carr...@aetion.com (Mark T. B. Carroll) — Thu, 01 Жов 2009 15:16:56 UT

It has been a long time since I really had to think about how monads are
implemented so I thought I should take a refresher course, in probably
reinventing the wheel by implementing from scratch a sequential logging
monad I need for a project. The point of it is that client code can
append to it, but not do anything else with it if I hide the Log and

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Laziness of sequence

l...@iks-jena.de (Lutz Donnerhacke) — Fri, 18 Вер 2009 16:03:25 UT

During an interesting discussion in de.alt.sysadmin.recovery we touched
laziness issues of mapM.
Just 4
Just [1,2,3]
_|_
This can be stripped down to the laziness behavior of sequence and from its
definition the strictness issues of (>>=).
Now the question arises, how to define sequence, to allow indefinite long

whither operational semantics?

rao...@gmail.com (raould) — Fri, 18 Вер 2009 00:07:52 UT

hi,
sounds like folks criticize haskell (and probably rightly so) for not
having a good definition, so implementations can ethically vary
widely. so which fp actually does have well nailed-down semantics?
plus a useful-in-the-real-world implementation (or two or three)?
thanks.

overflow behavior

ja...@nospam.org (jacob navia) — Sun, 13 Вер 2009 22:39:32 UT

Hi
I would like to know if you could point me to a document specifying the
behavior of haskel with integer overflow. I mean when you have two
integers, what happens when you multiply them? Is overflow checked?
Thanks