On Mon, Oct 5, 2009 at 11:02 AM, Sönke Hahn sh...@cs.tu-berlin.de wrote:
On 5 Oct 2009, at 21:06, Lennart Augustsson wrote:
OK, just pairs have no arithmetic, but one way of defining
arithmetic is to treat the pairs as complex numbers. Or as mantissa
and exponent. Or as something
2009/10/6 Mikhail Glushenkov the.dead.shall.r...@gmail.com:
Hi Paul,
Paul Moore p.f.moore at gmail.com writes:
Is there a way I could have specified that I want the global install
directory in D:\Apps\Haskell? I guess I could hack my cabal\config
file (and presumably change PATH) but that
It isn't clear what it is that you are trying to generalize the code
to do. If you are trying to generalize it to work with an arbitrary
input/output stream of lines, then unless you are doing arbitrary I/O
it seems to me that all of these instance declarations are overkill.
All that you
Oh, and I just thought of one more approach:
class StreamMonad m where
fetchLine = m
sendLine = String - m ()
instance StreamMonad IO where
fetchLine = getLine
sendLine = putLine
fetchLineFromStream = lift fetchLine
sendLineToStream = lift . sendLine
type
Hi Paul,
On Tue, Oct 6, 2009 at 9:11 AM, Paul Moore p.f.mo...@gmail.com
The ugliness (a bad word, I agree) was the need to change multiple
items - (at least) 2 places in the config file and (presumably) the
PATH entry.
Is that all I need to change?
I'm not a Cabal expert, but it looks like
2009/10/6 Mikhail Glushenkov the.dead.shall.r...@gmail.com:
Hi Paul,
On Tue, Oct 6, 2009 at 9:11 AM, Paul Moore p.f.mo...@gmail.com
The ugliness (a bad word, I agree) was the need to change multiple
items - (at least) 2 places in the config file and (presumably) the
PATH entry.
Is that all
On Mon, Oct 5, 2009 at 11:52 AM, Jon Fairbairn
jon.fairba...@cl.cam.ac.uk wrote:
[1] A pet peeve of mine is x supports y being used backwards (as in
our application supports windows Vista, which would only make sense if
it were something like a system tool that stopped Vista crashing.
(Not a
David Virebayre dav.vire+hask...@gmail.com writes:
On Mon, Oct 5, 2009 at 11:52 AM, Jon Fairbairn
jon.fairba...@cl.cam.ac.uk wrote:
[1] A pet peeve of mine is x supports y being used backwards (as in
our application supports windows Vista, which would only make sense if
it were something
On Mon, 5 Oct 2009, Jason Dagit wrote:
2. How can i use numeric literals to construct values, whose types are not
in
the Num class?
Numeric literals are treated as Integer or Rational, and are then
converted with the function fromInteger or fromRational, respectively, to
the required type.
2009/10/6 Mikhail Glushenkov the.dead.shall.r...@gmail.com:
Hi Paul,
Paul Moore p.f.moore at gmail.com writes:
Is there a way I could have specified that I want the global install
directory in D:\Apps\Haskell? I guess I could hack my cabal\config
file (and presumably change PATH) but that
Paul Moore wrote:
grep global -A7 D:\Documents and Settings\uk03306\Application
Data\cabal\config
install-dirs global
-- prefix: D:\\Apps\\Haskell\\Cabal
^^^
You should remove the '-- '. Lines beginning with '--' are comments.
So this line has no effect.
HTH,
Bertram
On Oct 5, 2009, at 17:45 , Terry Hayes wrote:
I found the handling of (IO t) by the interpreter (GHCI in my case)
to be somewhat confusing. As pointed out below, I can type:
readFile bla :: IO String
and GHCI happily displays the contents of the file. However neither
of the
class StreamMonad m where
fetchLine = m
sendLine = String - m ()
instance StreamMonad IO where
fetchLine = getLine
sendLine = putLine
fetchLineFromStream = lift fetchLine
sendLineToStream = lift . sendLine
This approach makes more sense to me. The equivalent
2009/10/6 Bertram Felgenhauer bertram.felgenha...@googlemail.com:
Paul Moore wrote:
grep global -A7 D:\Documents and Settings\uk03306\Application
Data\cabal\config
install-dirs global
-- prefix: D:\\Apps\\Haskell\\Cabal
^^^
You should remove the '-- '. Lines beginning with '--' are
To keep Joe Fredette happy [1] this time, I've combined these two
announcements into one.
[1] http://sequence.complete.org/hwn/20091003
I'm pleased to announce the latest versions of Graphalyze [2] and
SourceGraph [3]. The only change to Graphalyze has been the addition of
Legend support
thanks for the connection to the gui runner - it is interesting and worthwile,
but a different approach. my approach is strictly declarative and does not
describe sequences of process. it describes screens and links operations to
buttons. then it takes inputs from the screen and runs the
Putting a constraint on the MonadIO class actually makes your code
less general rather than more since it prevents your code from ever
being used in a purely functional setting. If you leave out this
constraint, you can actually turn your code into a pure function by
doing things like
This is the right approach to a GUI toolkit.
Note that personally, I believe the details of the presentation should
be separate from Haskell, stored in a separate file that is machine-
friendly, so designers can work in concert and in parallel with
developers.
Regards,
John A. De Goes
I think if I knew which libraries to add to the gcc link, I could make this
work, but can't seem to find out from the documentation.
Here are more specifics:
I'd like to build a Cocoa program on OS X with the Aqua user interface
using Xcode, but using a Haskell module with functions accessed
John == John A De Goes j...@n-brain.net writes:
John This is the right approach to a GUI toolkit.
John Note that personally, I believe the details of the
John presentation should be separate from Haskell, stored in a
John separate file that is machine- friendly, so designers can
CSS is a good start by it's beset by all the problems of a 1st
generation presentation language, and is not particularly machine-
friendly.
Regards,
John A. De Goes
N-Brain, Inc.
The Evolution of Collaboration
http://www.n-brain.net|877-376-2724 x 101
On Oct 6, 2009, at 10:44 AM,
2009/10/6 John A. De Goes j...@n-brain.net:
CSS is a good start by it's beset by all the problems of a 1st generation
presentation language, and is not particularly machine-friendly.
I think CSS is neat for websites, but I'm not so sure about using it
in normal applications.
--
Deniz Dogan
Generally you should be able to tell which library you're missing
based on the names of the undefined symbols. Have you link in...
libgmp.a? libm.a? libc.a? What are the missing symbols?
Thomas
On Tue, Oct 6, 2009 at 9:44 AM, John Velman vel...@cox.net wrote:
I think if I knew which libraries
Hi,
On Tue, Oct 6, 2009 at 2:37 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
Numeric literals are treated as Integer or Rational, and are then converted
with the function fromInteger or fromRational, respectively, to the required
type. Whatever fromInteger function is in scope,
This may be a little off-topic, but if someone could help me, I'd be
grateful.I am trying to get to a working gtk2hs environment in MacOSX Snow
Leopard
I have a Macbook Pro 2.1 with Snow Leopard.
While I had Leopard, I had the Haskell Platform installed, and it worked
fine.
I also had the
Arne Dehli Halvorsen arne@gmail.com writes:
This may be a little off-topic, but if someone could help me, I'd be grateful.
I am trying to get to a working gtk2hs environment in MacOSX Snow Leopard
Have you patched:
/usr/bin/ghc
/usr/bin/ghci
/usr/bin/runhaskell
/usr/bin/runghc
On Tue, Oct 06, 2009 at 09:48:44AM -0700, Thomas DuBuisson wrote:
Thanks, Thomas.
Linking in only libffi.a, libgmp.a, I get (for example, there are many
more) missing:
_newCAF
_base_GHCziBase_plusInt_closure
_base_GHCziList_zzipWith_info
_base_GHCziList_lvl5_closure
by also linking
You are missind libHSbase. Try, for example:
locate libHSbase-3.0.1.0.a
and link that in.
Thomas
On Tue, Oct 6, 2009 at 11:51 AM, John Velman vel...@cox.net wrote:
On Tue, Oct 06, 2009 at 09:48:44AM -0700, Thomas DuBuisson wrote:
Thanks, Thomas.
Linking in only libffi.a, libgmp.a, I
John Velman vel...@cox.net writes:
On Tue, Oct 06, 2009 at 09:48:44AM -0700, Thomas DuBuisson wrote:
Thanks, Thomas.
Linking in only libffi.a, libgmp.a, I get (for example, there are many
more) missing:
_newCAF
_base_GHCziBase_plusInt_closure
_base_GHCziList_zzipWith_info
On Tue, Oct 6, 2009 at 8:49 PM, Gregory Collins g...@gregorycollins.netwrote:
Arne Dehli Halvorsen arne@gmail.com writes:
This may be a little off-topic, but if someone could help me, I'd be
grateful.
I am trying to get to a working gtk2hs environment in MacOSX Snow Leopard
Have you
As it says in the subject, how do I remove a package that I installed
(with the --user flag) via cabal?
Come to that, how do I list the packages I've installed via cabal?
cabal list --installed includes all the GHC standard library (which I
didn't install) and it doesn't seem to support a --user
you want:
ghc-pkg unregister [package name]
and
ghc-pkg list
/jve
On Tue, Oct 6, 2009 at 3:52 PM, Paul Moore p.f.mo...@gmail.com wrote:
As it says in the subject, how do I remove a package that I installed
(with the --user flag) via cabal?
Come to that, how do I list the packages I've
2009/10/6 John Van Enk vane...@gmail.com:
you want:
ghc-pkg unregister [package name]
and
ghc-pkg list
Thanks. I wouldn't have found that by myself.
Unfortunately, having issued
ghc-pkg unregister mersenne-random-1.0
I still see the code present:
dir
Arne Dehli Halvorsen arne@gmail.com writes:
On Tue, Oct 6, 2009 at 8:49 PM, Gregory Collins g...@gregorycollins.net
wrote:
Arne Dehli Halvorsen arne@gmail.com writes:
This may be a little off-topic, but if someone could help me, I'd be
grateful.
I am trying to
Duncan Coutts wrote:
So you end up with pure functions like:
shuffle :: RandomGen g = g - [x] - [x]
Thanks for the help, Duncan. I'm confused on one point. Don't you always need
the new state of the generator back? So wouldn't this need to be:
shuffle :: RandomGen g = g - [x] - (g,[x])
Are you actually trying to remove the bits from the hard drive, or is that
something to fix a different problem you're having. If it's a different
problem, perhaps you could ask that as well?
On Tue, Oct 6, 2009 at 4:04 PM, Paul Moore p.f.mo...@gmail.com wrote:
2009/10/6 John Van Enk
On Tue, Oct 6, 2009 at 10:09 PM, Gregory Collins g...@gregorycollins.netwrote:
Arne Dehli Halvorsen arne@gmail.com writes:
On Tue, Oct 6, 2009 at 8:49 PM, Gregory Collins g...@gregorycollins.net
wrote:
hsc2hs was new to me, the others were ok.
It didn't help, though.
Sorry to
2009/10/6 John Van Enk vane...@gmail.com:
Are you actually trying to remove the bits from the hard drive, or is that
something to fix a different problem you're having. If it's a different
problem, perhaps you could ask that as well?
Yes, I'm trying to remove the bits from the disk.
I did a
2009/10/6 Paul Moore p.f.mo...@gmail.com:
2009/10/6 John Van Enk vane...@gmail.com:
Are you actually trying to remove the bits from the hard drive, or is that
something to fix a different problem you're having. If it's a different
problem, perhaps you could ask that as well?
Yes, I'm trying
2009/10/6 Peter Robinson thaldy...@gmail.com:
2009/10/6 Paul Moore p.f.mo...@gmail.com:
2009/10/6 John Van Enk vane...@gmail.com:
Are you actually trying to remove the bits from the hard drive, or is that
something to fix a different problem you're having. If it's a different
problem, perhaps
On Oct 6, 2009, at 3:49 AM, Lennart Augustsson wrote:
But complex numbers are just pairs of numbers. So pairs of numbers
can obviously be numbers then.
The basic problem here is that pairs of numbers can be made
to fit into the Haskell framework with more than one semantics.
For example,
Thanks, Gregory. I did something like that. In particular, I did
find . -name lib*.a | xargs nm ~/develop/haskellLibInfo/libInfo
Then I used the output from the build results file to look for stuff in the
libInfo file (using mac_vim). In this way I cut the number of undefined
references down
On Oct 6, 2009, at 19:20 , John Velman wrote:
HSghc-prim-0.1.0.0.o, HSinteger-0.1.0.1.o, libffi.a,
libgmp.a,
libHSbase-3.0.3.1.a, libHSbase-3.0.3.1_p.a, libHSbase-4.1.0.0.a,
libHSghc-prim-0.1.0.0_p.a, libHSrts.a
Note that library order matters; libgmp.a should probably be
On Mon, Oct 05, 2009 at 07:24:00AM -0700, Michael Mossey wrote:
If I understand correctly, this works because IO is an instance of
Applicative, correct?
I wonder if any of the random monads are instances of Applicative.
If they aren't then that's a bug in the library :). Every monad
can be
Why?
real numbers, complex nuimbers, n-dimensional spaces have well defined + and
* operations (vectorial product in the latter case).
even algebraic expressions like:
data Expr = Var String | Number Integer | Sin Expr | Cos Expr
can be instances of Num and express certain simplification rules
How do I create an alias for a function, like giving CAR the same functionality
as HEAD. I know I can do it by creating a definition (see below), but is there
a better way, like Scheme's
(define head car)
car :: [a] - a
car x = head x
The reason for doing this is to more closely mirror
Hallo,
On Tue, Oct 6, 2009 at 11:01 PM, michael rice nowg...@yahoo.com wrote:
How do I create an alias for a function, like giving CAR the same
functionality as HEAD. I know I can do it by creating a definition (see
below), but is there a better way, like Scheme's
(define head car)
car
car = head
letting the compiler infer the type, or
car :: [a] - a
car = head
for the explicit version.
-Ross
On Oct 6, 2009, at 10:01 PM, michael rice wrote:
How do I create an alias for a function, like giving CAR the same
functionality as HEAD. I know I can do it by creating a
Well, you can drop the arguments entirely, and let the type be
inferred to get
car = head
which is pretty nice. You could use an INLINE hint to make the
compiler replace it before compilation, though I don't think it would
change performance much...
/Joe
On Oct 6, 2009, at 10:01
Michael,
You can define a function without listing some or all of its arguments
by specifying it in terms of another function. So all you really need
to write is, e.g.,
car = head
cdr = tail
cadr = car . cdr
caddr = car . cadr
cadar = car . cdr . car
etc...
On Oct 6, 2009, at 7:01 PM,
On Tue, Oct 6, 2009 at 2:49 PM, Gregory Collins g...@gregorycollins.net wrote:
Arne Dehli Halvorsen arne@gmail.com writes:
This may be a little off-topic, but if someone could help me, I'd be
grateful.
I am trying to get to a working gtk2hs environment in MacOSX Snow Leopard
Have you
Thanks all!
There's ALWAYS seems to be a neat way to do what's needed with Haskell.
Michael
--- On Tue, 10/6/09, Joe Fredette jfred...@gmail.com wrote:
From: Joe Fredette jfred...@gmail.com
Subject: Re: [Haskell-cafe] Creating an alias for a function
To: michael rice nowg...@yahoo.com
Cc:
On Oct 7, 2009, at 5:47 AM, John A. De Goes wrote:
CSS is a good start by it's beset by all the problems of a 1st
generation presentation language, and is not particularly machine-
friendly.
Considering that CSS is _at least_ a 2nd generation language
(it was preceded by DSSSL), that's
Dmitry Olshansky wrote:
Hi, Erik,
Did you try Network.HTTP? Is it not enough?
Apparently not.
Now I need to do a post to a HTTPS server and Network.HTTP does
not seem to support HTTPS. Is that really right?
Erik
--
--
So, I've been fiddling with an utterly random idea. What if I had a
class:
class Hom a b where
data Rep a b
hm :: Rep a b - b
im :: a - Rep a b
That is, all types that have some conversion between them (an
isomorphism originally, then I thought
Michael P Mossey wrote:
Also note that I added the Random class constraint to 'shuffle'. I
haven't tested this but it might be necessary. Or not?
Okay I figured this part out too. The members of the list you are shuffling have
no class constraint on them because the 'shuffle' function is not
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