On 1 September 2010 15:14, John Millikin jmilli...@gmail.com wrote:
[aside] does anybody know how to get a list of what packages
somebody's uploaded to Hackage? I think I've updated all mine for the
new text version dependency, but I'm worried I forgot some.
Unfortunately, no; I've often
On Wed, Sep 1, 2010 at 07:14, John Millikin jmilli...@gmail.com wrote:
Don't forget, you can always improve the text library yourself. I love to
receive
patches, requests for improvement, and bug reports.
Are there any areas in particular you'd like help with, for either
library? I'm
does anybody know of anything on Hackage for testing whether two
values are approximately equal?
http://hackage.haskell.org/package/approximate-equality
--
Underestimating the novelty of the future is a time-honored tradition.
(D.G.)
___
2010/9/1 Tako Schotanus t...@codejive.org:
As a Haskell noob I'm curious about this statement, is there something
intrinsically wrong with String?
String is just a linked list of Char which are unicode code points;
which is probably not the optimal way to store text.
For intensive use of text
Hi Tako,
The issues involved with String, ByteString, Text and a few related
libraries were discussed at great length recently in this thread:
http://groups.google.com/group/haskell-cafe/browse_thread/thread/52a21cf61ffb21b0/
Basically, Chars are 32 bit integers and Strings are represented as a
On Tue, 2010-08-31 at 20:39 -0700, Ben wrote:
Hello --
Three related questions, going from most specific to most general :
1 ) Consider the stream processing arrow which computes a running sum,
with two implementations : first using generic ArrowCircuits (rSum);
second using Automaton
The monadic framework for delimited continuations described in
the paper by Dybvig, Peyton Jones and Sabry (JFP 2007) has found
many applications, for example, fair backtracking search, final
zippers, direct-style web programming, direct-style code generation,
and probabilistic programming. The
The debugger only instruments interpreted code, so evaluations
occurring inside library code do not show up in :trace. This is not a
terrible problem in practice, since usually seeing the evaluations
occurring in your code is what you need to debug the problem.
But since :trace is not showing you
Brent Yorgey byorgey at seas.upenn.edu writes:
Hi all,
This fall I'll be teaching a half-credit introduction to Haskell to
some undergrads. As a final project I am thinking of giving them the
option of (instead of developing some program/project of their own)
contributing to an
Hi Kevin,
thanks for the pointer, although I was aware of the thread and had followed
it quite closely, it was quite interesting.
But it never explained if and why String should be avoided, all I read is
test and decide depending on the circumstances, which in itself is good
advise, but I'd like
darcs get http://code.haskell.org/~dons/code/containers/
I was giving this a try, and this soon hosed ghc (6.12.3):
* (starting from a pristine ghc, from a binary package)
* cabal install for containers-0.4.0.0 (the above package)
* then cabal install for some package that uses
Tilo Wiklund wrote:
Daniel Fischer wrote:
[...]
Well, I just gave an example where one would want chunking for reasons
other than performance. That iteratees don't provide the desired
functionality is a different matter.
[...]
In the case of hashing, wouldn't it be more reasonable to consider
On Wednesday 01 September 2010 06:08:07, Bryan O'Sullivan wrote:
New in this release:
- Substantial performance improvements.
- Bug fixes, and better quality assurance via automated QuickCheck
and HPC tests and coverage.
- An even nicer API than before.
Good job.
The text
Hi, Daniel -
Thanks for taking the new code for a test drive!
The interesting part is the comparison between text and vanilla String I/O,
the difference is smaller than I expected for text-0.8.0.0.
Yes. Much of this is due to the new encoding stuff on Handles in GHC 6.12,
which is slow. Its
On Tue, Aug 31, 2010 at 10:14 PM, John Millikin jmilli...@gmail.com wrote:
Is there a summary of the API changes available? I see a new module,
but Precis is choking on Data.Text and Data.Text.Lazy, so I'm not sure
what existing signatures have been modified.
Ouch. I'll try to do a diff and
I've found a roommate now. So I don't need any more replies. :-)
On Sun, Aug 29, 2010 at 11:45 PM, Michael D. Adams mdmko...@gmail.com wrote:
Hi all,
I'm a graduate student (male) and am looking for a (male) roommate to
split the cost of a hotel room at ICFP. If anyone is interested in
This is probably widely known already but I just realized you can
sort-of have closed classes as it is:
module SomeModule( SomeClass, someMethod ) where
class SomeClassInternal a where
someMethodInternal :: a - Integer
instance SomeClassInternal Integer where
someMethodInternal = id
Thanks for the prompt reply. Some questions / comments below :
On Wed, Sep 1, 2010 at 12:33 AM, Maciej Piechotka uzytkown...@gmail.com wrote:
rSum2 :: ArrowCircuit a = a Int Int
rSum2 = proc x - do
rec out - delay 0 - out + x
returnA - out + x
Wow, that was simple. I guess I never
On Wed, 2010-09-01 at 11:49 -0700, Ben wrote:
Thanks for the prompt reply. Some questions / comments below :
On Wed, Sep 1, 2010 at 12:33 AM, Maciej Piechotka uzytkown...@gmail.com
wrote:
rSum2 :: ArrowCircuit a = a Int Int
rSum2 = proc x - do
rec out - delay 0 - out + x
On Wednesday 01 September 2010 18:15:19, Bryan O'Sullivan wrote:
Hi, Daniel -
Thanks for taking the new code for a test drive!
The interesting part is the comparison between text and vanilla String
I/O, the difference is smaller than I expected for text-0.8.0.0.
Yes. Much of this is due
On Wednesday 01 September 2010 21:29:47, Daniel Fischer wrote:
that's where you definitely get a space leak, because
intersperse :: a - [a] - [a]
intersperse _ [] = []
intersperse _ [x] = [x]
intersperse sep (x:xs) = x : sep : intersperse sep xs
isn't lazy enough.
michael rice wrote:
Prelude Data.Either let m = Just 7
Prelude Data.Either :t m
m :: Maybe Integer
So to create a value of type (Maybe ...), you can use Just.
Prelude Data.Either let l = 2:[]
Prelude Data.Either :t l
l :: [Integer]
So to create a value of type [...], you can use (:) and
Hello Arrow-theorists --
In a previous email Maciej Piechotka showed me how to construct a
recursive function I wanted via ArrowCircuits. This computes the
running sum of a stream of Ints.
rSum :: ArrowCircuit a = a Int Int
rSum = proc x - do
rec let next = out + x
out - delay 0 - next
Hi,
there is a new ticket that Data.List.intersperse is not as non-strict
as possible (http://hackage.haskell.org/trac/ghc/ticket/4282). I have
observed some other functions which are unnecessarily strict and it
might be advantageous to change their definitions as well.
I think it is
Hi Tillman,
Prelude Control.Monad Control.Monad.Instances Control.Applicative let f = \x
- x:[]
Prelude Control.Monad Control.Monad.Instances Control.Applicative :t f
f :: a - [a]
Prelude Control.Monad Control.Monad.Instances Control.Applicative let g = \x
- Just x
Prelude Control.Monad
On Mon, Aug 30, 2010 at 11:24:06PM -0700, strejon wrote:
I'm aware of phantom types and the like, but I've been unable to
work out how to use them (or another type system extension)
to properly track validity on the type level. I'd want something
like:
validate :: Certificate Possibly_Valid
My apologies, my space leak was in my implementation of runAuto. Ignore me!
b
On Wed, Sep 1, 2010 at 3:01 PM, Ben midfi...@gmail.com wrote:
Hello Arrow-theorists --
In a previous email Maciej Piechotka showed me how to construct a
recursive function I wanted via ArrowCircuits. This
On Thursday 02 September 2010 00:05:03, Jan Christiansen wrote:
Hi,
there is a new ticket that Data.List.intersperse is not as non-strict
as possible (http://hackage.haskell.org/trac/ghc/ticket/4282).
It's not that it's not as non-strict as possible per se. (Sorry, had to :)
It's that
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On 09/01/2010 02:44 AM, Ivan Lazar Miljenovic wrote:
On 1 September 2010 16:27, David Virebayre
dav.vire+hask...@gmail.com wrote:
Sometimes I'd love if I could program using String and the
compiler would automatically convert that to Text, or
On Wed, Sep 1, 2010 at 7:40 PM, David Powell da...@drp.id.au wrote:
Greetings,
I'm having an issue with the HDBC-postgresql package that requires me to
manually patch it before installation for most of my use cases.
All the FFI calls in this package are marked unsafe. Unfortunately, this
Thanks Jason, I think I had read that - I quite enjoy Edward's posts.
Re-reading, seems to confirm what I thought, most (all?) of the FFI calls in
HDBC-postgresql should be changed to safe.
-- David
On Thu, Sep 2, 2010 at 2:47 PM, Jason Dagit da...@codersbase.com wrote:
On Wed, Sep 1, 2010 at
On Wed, Sep 1, 2010 at 10:00 PM, David Powell da...@drp.id.au wrote:
Thanks Jason, I think I had read that - I quite enjoy Edward's posts.
Re-reading, seems to confirm what I thought, most (all?) of the FFI calls in
HDBC-postgresql should be changed to safe.
Yes I think so. Unless you know
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