Re: [Haskell-cafe] Haskell Platform's libstdc++-6.dll may be interfering with other applications
On Tue, 07 May 2013 20:27:06 +0200, Andrew Pennebaker andrew.penneba...@gmail.com wrote: I use a number of different programming languages, so I have Haskell Platform, Strawberry Perl, Node.js, RVM, and Git Bash installed at the same time. I've noticed that compiling packages with C dependencies (e.g. using node-gyp during npm install node-mhash, or doing cpan install PAR::Packer) often crashes during the build process with a popup: The procedure entry point __gxx_personality_sj0 could not be located in the dynamic link library libstdc++-6.dll. As Roderich Schupp points outhttps://rt.cpan.org/Public/Bug/Display.html?id=84949, it appears that the different libstdc++-6.dll's are interfering with one another. Haskell Platform comes with one, Vagrant comes with one, GIMP comes with one, MinGW comes with one, and Strawberry Perl comes with two! Objdump seems to indicate that Haskell Platform's DLL is the one to blame. : : Would updating Haskell Platform's libstdc++-6.dll fix this issue? Is there some way to cordon Haskell Platform off from the rest of the system, while still making ghc.exe and friends available on PATH? : I think there will always be discrepancies between different versions of DLLs; one way to solve this, is to put the Haskell compiler directory at the beginning of the search path when you are compiling with it. When you decide that you are satisfied with your executable, put the libstdc++-6.dll in the executables directory, as this directory is searched first for DLLs, when running the executable. Regards, Henk-Jan van Tuyl -- Folding@home What if you could share your unused computer power to help find a cure? In just 5 minutes you can join the world's biggest networked computer and get us closer sooner. Watch the video. http://folding.stanford.edu/ http://Van.Tuyl.eu/ http://members.chello.nl/hjgtuyl/tourdemonad.html Haskell programming -- ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN haskdogs-0.3.2
Hi. I'm pleased to announce haskdogs-0.3.2, a source navigation helper. Haskdogs is a small HSH-based tool which calls hasktags to create tag file for entire haskell project. It takes into account first-level dependencies by recursively scanning imports and adding matching packages to the final tag list. As a result, programmer can use her text editor supporting tags (vim, for example) to jump directly to definition of any function she uses. Note that haskdogs call Unix shell commands like 'test' or 'mkdir' so this tool will likely fail to work on pure Windows platforms. In return, haskdogs is pretty small - only 125 lines long. Changes: * Generate extended tag file by default (hasktags -c -x) * Add -d command line option which allows user to specify additional source directories * Fix no-sources bug Github: https://github.com/ierton/haskdogs See also Vim-hint at https://github.com/ierton/haskdogs#vim-hint Install: cabal install hasktags haskdogs Usage: haskdogs [-d (FILE|'-')] [FLAGS] FLAGS will be passed to hasktags as-is followed by a list of files. Defaults to -c -x. Basically, just run haskdogs in your Haskell project directory Thanks to yihuang for the contributions! Sergey ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Set monad
On 04/12/2013 12:49 PM, o...@okmij.org wrote:
One problem with such monad implementations is efficiency. Let's define
step :: (MonadPlus m) = Int - m Int
step i = choose [i, i + 1]
-- repeated application of step on 0:
stepN :: (Monad m) = Int - m (S.Set Int)
stepN = runSet . f
where
f 0 = return 0
f n = f (n-1)= step
Then `stepN`'s time complexity is exponential in its argument. This is
because `ContT` reorders the chain of computations to right-associative,
which is correct, but changes the time complexity in this unfortunate way.
If we used Set directly, constructing a left-associative chain, it produces
the result immediately:
The example is excellent. And yet, the efficient genuine Set monad is
possible.
BTW, a simpler example to see the problem with the original CPS monad is to
repeat
choose [1,1] choose [1,1]choose [1,1] return 1
and observe exponential behavior. But your example is much more
subtle.
Enclosed is the efficient genuine Set monad. I wrote it in direct
style (it seems to be faster, anyway). The key is to use the optimized
choose function when we can.
{-# LANGUAGE GADTs, TypeSynonymInstances, FlexibleInstances #-}
module SetMonadOpt where
import qualified Data.Set as S
import Control.Monad
data SetMonad a where
SMOrd :: Ord a = S.Set a - SetMonad a
SMAny :: [a] - SetMonad a
instance Monad SetMonad where
return x = SMAny [x]
m= f = collect . map f $ toList m
toList :: SetMonad a - [a]
toList (SMOrd x) = S.toList x
toList (SMAny x) = x
collect :: [SetMonad a] - SetMonad a
collect [] = SMAny []
collect [x] = x
collect ((SMOrd x):t) = case collect t of
SMOrd y - SMOrd (S.union x y)
SMAny y - SMOrd (S.union x (S.fromList y))
collect ((SMAny x):t) = case collect t of
SMOrd y - SMOrd (S.union y (S.fromList x))
SMAny y - SMAny (x ++ y)
runSet :: Ord a = SetMonad a - S.Set a
runSet (SMOrd x) = x
runSet (SMAny x) = S.fromList x
instance MonadPlus SetMonad where
mzero = SMAny []
mplus (SMAny x) (SMAny y) = SMAny (x ++ y)
mplus (SMAny x) (SMOrd y) = SMOrd (S.union y (S.fromList x))
mplus (SMOrd x) (SMAny y) = SMOrd (S.union x (S.fromList y))
mplus (SMOrd x) (SMOrd y) = SMOrd (S.union x y)
choose :: MonadPlus m = [a] - m a
choose = msum . map return
test1 = runSet (do
n1- choose [1..5]
n2- choose [1..5]
let n = n1 + n2
guard $ n 7
return n)
-- fromList [2,3,4,5,6]
-- Values to choose from might be higher-order or actions
test1' = runSet (do
n1- choose . map return $ [1..5]
n2- choose . map return $ [1..5]
n- liftM2 (+) n1 n2
guard $ n 7
return n)
-- fromList [2,3,4,5,6]
test2 = runSet (do
i- choose [1..10]
j- choose [1..10]
k- choose [1..10]
guard $ i*i + j*j == k * k
return (i,j,k))
-- fromList [(3,4,5),(4,3,5),(6,8,10),(8,6,10)]
test3 = runSet (do
i- choose [1..10]
j- choose [1..10]
k- choose [1..10]
guard $ i*i + j*j == k * k
return k)
-- fromList [5,10]
-- Test by Petr Pudlak
-- First, general, unoptimal case
step :: (MonadPlus m) = Int - m Int
step i = choose [i, i + 1]
-- repeated application of step on 0:
stepN :: Int - S.Set Int
stepN = runSet . f
where
f 0 = return 0
f n = f (n-1)= step
-- it works, but clearly exponential
{-
*SetMonad stepN 14
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14]
(0.09 secs, 31465384 bytes)
*SetMonad stepN 15
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
(0.18 secs, 62421208 bytes)
*SetMonad stepN 16
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
(0.35 secs, 124876704 bytes)
-}
-- And now the optimization
chooseOrd :: Ord a = [a] - SetMonad a
chooseOrd x = SMOrd (S.fromList x)
stepOpt :: Int - SetMonad Int
stepOpt i = chooseOrd [i, i + 1]
-- repeated application of step on 0:
stepNOpt :: Int - S.Set Int
stepNOpt = runSet . f
where
f 0 = return 0
f n = f (n-1)= stepOpt
{-
stepNOpt 14
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14]
(0.00 secs, 515792 bytes)
stepNOpt 15
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
(0.00 secs, 515680 bytes)
stepNOpt 16
fromList [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]
(0.00 secs, 515656 bytes)
stepNOpt 30
fromList
[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]
(0.00 secs, 1068856 bytes)
-}
Oleg, thanks a lot for this example, and sorry for my late reply. I
really like the idea and I'm hoping to a similar concept soon for a
monad representing probability computations.
With best regards,
Petr
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[Haskell-cafe] Parallel ghc --make
I know this has been talked about before and also a bit in the recent GSoC discussion. I would like to know what prevents ghc --make from working in parallel, who worked at that in the past, what their findings were and a general estimation of the difficulty of the problem. Afterwards, I would update http://hackage.haskell.org/trac/ghc/ticket/910 with a short summary of what the current situation is. Thanks to those who know more! ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Release Candidates for Haskell Platform 2013.2
*Some of the release candidates for Haskell Platform 2013.2 are up.* *These are what I expect to simply re-brand as the release, unless anyone uncovers some issues.* *If you decide to test these out, please let me know how it goes.* * * The Mac OS X RC2 installers: *32bit: *Haskell Platform 2013.2.0.0 32bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2032bit%20rc2.signed.pkg *64bit: *Haskell Platform 2013.2.0.0 64bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2064bit%20rc2.signed.pkg The source tarball (RC1): haskell-platform-2013.2.0.0-rc1.tar.gzhttp://www.ozonehouse.com/mark/platform/haskell-platform-2013.2.0.0-rc1.tar.gz *Notable new things in Haskell Platform 2013.2:* - GHC 7.6.3 - Major update to *OpenGL* *GLUT* - New packages: - *attoparsec* - *case-insensitive* - *hashable* - *unordered-containers* — Mark mad releaser Lentczner ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Release Candidates for Haskell Platform 2013.2
That's awesome :) I'm just curious to dig deeper inside the updates to OpenGL and GLUT, any link or change notes I can read? Thanks, A. On 13 May 2013 15:39, Mark Lentczner mark.lentcz...@gmail.com wrote: *Some of the release candidates for Haskell Platform 2013.2 are up.* *These are what I expect to simply re-brand as the release, unless anyone uncovers some issues.* *If you decide to test these out, please let me know how it goes.* * * The Mac OS X RC2 installers: *32bit: *Haskell Platform 2013.2.0.0 32bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2032bit%20rc2.signed.pkg *64bit: *Haskell Platform 2013.2.0.0 64bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2064bit%20rc2.signed.pkg The source tarball (RC1): haskell-platform-2013.2.0.0-rc1.tar.gzhttp://www.ozonehouse.com/mark/platform/haskell-platform-2013.2.0.0-rc1.tar.gz *Notable new things in Haskell Platform 2013.2:* - GHC 7.6.3 - Major update to *OpenGL* *GLUT* - New packages: - *attoparsec* - *case-insensitive* - *hashable* - *unordered-containers* — Mark mad releaser Lentczner ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Release Candidates for Haskell Platform 2013.2
Mark Lentczner mark.lentczner at gmail.com writes: Some of the release candidates for Haskell Platform 2013.2 are up.These are what I expect to simply re-brand as the release, unless anyone uncovers some issues. Will they go on http://trac.haskell.org/haskell-platform/wiki/ReleaseCandidates? (http://trac.haskell.org/haskell-platform/ has a few outdated links. Does anyone know what the current links are for the documentation sections?) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Parallel ghc --make
I wrote a ghc-server that starts a persistent process for each cpu. Then a 'ghc' frontend wrapper sticks each job in a queue. It seemed to be working, but timing tests didn't reveal any speed-up. Then I got a faster computer and lost motivation. I didn't investigate very deeply why it didn't speed up as I hoped. It's possible the approach is still valid, but I made some mistake in the implementation. So I can stop writing this little blurb I put it on github: https://github.com/elaforge/ghc-server On Mon, May 13, 2013 at 8:40 PM, Niklas Hambüchen m...@nh2.me wrote: I know this has been talked about before and also a bit in the recent GSoC discussion. I would like to know what prevents ghc --make from working in parallel, who worked at that in the past, what their findings were and a general estimation of the difficulty of the problem. Afterwards, I would update http://hackage.haskell.org/trac/ghc/ticket/910 with a short summary of what the current situation is. Thanks to those who know more! ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Release Candidates for Haskell Platform 2013.2
OpenGL and GLUT were very down-rev for quite a number or HP releases. The recent changes are: - OpenGL http://hackage.haskell.org/package/OpenGL *2.2.3.1* ⟶ *2.8.0.0 * - GLUT http://hackage.haskell.org/package/GLUT *2.1.2.1* ⟶ *2.4.0.0* I know that this involved a fair bit of juggling and there are two new modules OpenGLRaw and GLURaw. Perhaps Jason D. can fill us in on the highlights? On Mon, May 13, 2013 at 7:58 AM, Alfredo Di Napoli alfredo.dinap...@gmail.com wrote: That's awesome :) I'm just curious to dig deeper inside the updates to OpenGL and GLUT, any link or change notes I can read? Thanks, A. On 13 May 2013 15:39, Mark Lentczner mark.lentcz...@gmail.com wrote: *Some of the release candidates for Haskell Platform 2013.2 are up.* *These are what I expect to simply re-brand as the release, unless anyone uncovers some issues.* *If you decide to test these out, please let me know how it goes.* * * The Mac OS X RC2 installers: *32bit: *Haskell Platform 2013.2.0.0 32bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2032bit%20rc2.signed.pkg *64bit: *Haskell Platform 2013.2.0.0 64bit rc2.signed.pkghttp://www.ozonehouse.com/mark/platform/Haskell%20Platform%202013.2.0.0%2064bit%20rc2.signed.pkg The source tarball (RC1): haskell-platform-2013.2.0.0-rc1.tar.gzhttp://www.ozonehouse.com/mark/platform/haskell-platform-2013.2.0.0-rc1.tar.gz *Notable new things in Haskell Platform 2013.2:* - GHC 7.6.3 - Major update to *OpenGL* *GLUT* - New packages: - *attoparsec* - *case-insensitive* - *hashable* - *unordered-containers* — Mark mad releaser Lentczner ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Release Candidates for Haskell Platform 2013.2
It's a wiki - please feel free to do some maintenance when you find it! I fixed the ReleaseCandidates page. - Mark On Mon, May 13, 2013 at 8:21 AM, harry volderm...@hotmail.com wrote: Mark Lentczner mark.lentczner at gmail.com writes: Some of the release candidates for Haskell Platform 2013.2 are up.These are what I expect to simply re-brand as the release, unless anyone uncovers some issues. Will they go on http://trac.haskell.org/haskell-platform/wiki/ReleaseCandidates? (http://trac.haskell.org/haskell-platform/ has a few outdated links. Does anyone know what the current links are for the documentation sections?) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Release Candidates for Haskell Platform 2013.2
On Mon, May 13, 2013 at 9:39 PM, Mark Lentczner mark.lentcz...@gmail.comwrote: *Some of the release candidates for Haskell Platform 2013.2 are up.* Kudos! Exactly 7 days from the scheduled date, as stated. Hope to give them a whirl once the other OSes are baked. -- Kim-Ee ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problem with mailman at projects.haskell.org
The mailman daemon process on the server apparently exited for some reason. I restarted it, and now mail traffic seems to be going through normally again. -Yitz On Sun, May 12, 2013 at 9:21 PM, Carter Schonwald carter.schonw...@gmail.com wrote: I've had this problem too. Was trying to sign up for the llvm HS lib list but cant. I asked on Haskell irc and no one seems to know who admins the lists currently. On May 12, 2013 7:24 AM, Tim Docker t...@dockerz.net wrote: Hi, Has anyone noticed problems with the mailman instance running at projects.haskell.org? As best I can see there are no new posts in any of the hosted list archives since mid April. I know that there have been posts made to ch...@projects.haskell.org in May, and these have neither be distributed or archived. I've not had a response from mail...@projects.haskell.org. Tim ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problem with mailman at projects.haskell.org
Thanks - I can confirm all is working again. I believe than, within some time window. some messages may have been dropped. Tim On 14/05/13 07:06, Yitzchak Gale wrote: The mailman daemon process on the server apparently exited for some reason. I restarted it, and now mail traffic seems to be going through normally again. -Yitz On Sun, May 12, 2013 at 9:21 PM, Carter Schonwald carter.schonw...@gmail.com wrote: I've had this problem too. Was trying to sign up for the llvm HS lib list but cant. I asked on Haskell irc and no one seems to know who admins the lists currently. On May 12, 2013 7:24 AM, Tim Docker t...@dockerz.net wrote: Hi, Has anyone noticed problems with the mailman instance running at projects.haskell.org? As best I can see there are no new posts in any of the hosted list archives since mid April. I know that there have been posts made to ch...@projects.haskell.org in May, and these have neither be distributed or archived. I've not had a response from mail...@projects.haskell.org. Tim ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Problem with mailman at projects.haskell.org
Quite possible, though I did see some messages going through from two days ago when the mailman daemon went south. Anyone who sent out an important message to one of those lists during the past two days should double check that it now went out to the list. -Yitz On Tue, May 14, 2013 at 12:17 AM, Tim Docker t...@dockerz.net wrote: Thanks - I can confirm all is working again. I believe than, within some time window. some messages may have been dropped. Tim On 14/05/13 07:06, Yitzchak Gale wrote: The mailman daemon process on the server apparently exited for some reason. I restarted it, and now mail traffic seems to be going through normally again. -Yitz On Sun, May 12, 2013 at 9:21 PM, Carter Schonwald carter.schonw...@gmail.com wrote: I've had this problem too. Was trying to sign up for the llvm HS lib list but cant. I asked on Haskell irc and no one seems to know who admins the lists currently. On May 12, 2013 7:24 AM, Tim Docker t...@dockerz.net wrote: Hi, Has anyone noticed problems with the mailman instance running at projects.haskell.org? As best I can see there are no new posts in any of the hosted list archives since mid April. I know that there have been posts made to ch...@projects.haskell.org in May, and these have neither be distributed or archived. I've not had a response from mail...@projects.haskell.org. Tim ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] fromIntegral not enough?
This is probably a haskell-beginners sort of question, but I usually get about 4x as many responses from cafe, about 10x as fast. I have code like so: code: data Xy a = Xy a a class Coord2 a where coords2 :: Fractional b = a b - Xy b data CircAppr a b = CircAppr a b b -- number of points, rotation angle, radius deriving (Show) instance Integral a = Coord2 (CircAppr a) where coords2 (CircAppr divns ang rad) = let dAng = 2 * pi / (fromIntegral divns) in let angles = map (* dAng) [0..divns] in undefined -- To be coded... In the instance definition divns is an integral trying to divide a fractional. I hoped wrapping it in fromIntegral would coerce, but apparently not: quote: Could not deduce (Fractional a) arising from a use of `/' from the context (Integral a) bound by the instance declaration at /scratch/cmhoward/pulse-spin/pulse-spin.hs:34:10-42 or from (Fractional b) bound by the type signature for coords2 :: Fractional b = CircAppr a b - Xy b at /scratch/cmhoward/pulse-spin/pulse-spin.hs:(36,3)-(39,15) Possible fix: add (Fractional a) to the context of the type signature for coords2 :: Fractional b = CircAppr a b - Xy b or the instance declaration In the expression: 2 * pi / (fromIntegral divns) In an equation for `dAng': dAng = 2 * pi / (fromIntegral divns) In the expression: let dAng = 2 * pi / (fromIntegral divns) in let angles = map (* dAng) [0 .. divns] in undefined So, I'm wondering how I can do what I'm trying to do here, while still keeping my types as generic as possible. -- frigidcode.com signature.asc Description: OpenPGP digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] fromIntegral not enough?
On Mon, May 13, 2013 at 02:08:26PM -0800, Christopher Howard wrote: instance Integral a = Coord2 (CircAppr a) where coords2 (CircAppr divns ang rad) = let dAng = 2 * pi / (fromIntegral divns) in let angles = map (* dAng) [0..divns] in undefined -- To be coded... Your definition of angles forces dAng to be of type a. Then in order to define dAng as the result of a / there must be a Fractional instance for a. Hope that helps. Tom ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] fromIntegral not enough?
On Mon, May 13, 2013 at 11:43:41PM +0100, Tom Ellis wrote: On Mon, May 13, 2013 at 02:08:26PM -0800, Christopher Howard wrote: instance Integral a = Coord2 (CircAppr a) where coords2 (CircAppr divns ang rad) = let dAng = 2 * pi / (fromIntegral divns) in let angles = map (* dAng) [0..divns] in undefined -- To be coded... Your definition of angles forces dAng to be of type a. Then in order to define dAng as the result of a / there must be a Fractional instance for a. You probably want let angles = map ((* dAng) . fromInteger) [0..divns] in ... instead. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] fromIntegral not enough?
On 05/13/2013 02:53 PM, Tom Ellis wrote: On Mon, May 13, 2013 at 11:43:41PM +0100, Tom Ellis wrote: You probably want let angles = map ((* dAng) . fromInteger) [0..divns] in ... instead. Ah, that works. Thanks all. -- frigidcode.com signature.asc Description: OpenPGP digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: Robot - Simulate keyboard and mouse events under X11
Oh, I see now. I originally made the runRobot functions reset the input state when the Robot finished running. That worked well for my use case (testing GUIs), but as you have noticed, it causes unintuitive behavior when runRobot is called at a high frequency. In hindsight, that was a design flaw on my part: that resetting behavior should be specified explicitly, not attached unconditionally to every call to runRobot. I've removed the offending code, and released it as version 1.1. Hopefully I've ironed out the issues now :) On Mon, May 13, 2013 at 12:49 PM, Niklas Hambüchen m...@nh2.me wrote: Can you show me the code that triggers that behavior? It is basically Just connection - connect forever $ do (x,y) - getGyroMovement runRobotWithConnection (moveBy x y) connection -- Chris Wong, fixpoint conjurer e: lambda.fa...@gmail.com w: http://lfairy.github.io/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: Robot - Simulate keyboard and mouse events under X11
Awesome, that works very well, and it even made my program run faster / with less CPU. The reset functionality is useful, but I think optional is better. Did you remove it entirely or is it still available? On Tue 14 May 2013 08:25:04 SGT, Chris Wong wrote: Oh, I see now. I originally made the runRobot functions reset the input state when the Robot finished running. That worked well for my use case (testing GUIs), but as you have noticed, it causes unintuitive behavior when runRobot is called at a high frequency. In hindsight, that was a design flaw on my part: that resetting behavior should be specified explicitly, not attached unconditionally to every call to runRobot. I've removed the offending code, and released it as version 1.1. Hopefully I've ironed out the issues now :) On Mon, May 13, 2013 at 12:49 PM, Niklas Hambüchen m...@nh2.me wrote: Can you show me the code that triggers that behavior? It is basically Just connection - connect forever $ do (x,y) - getGyroMovement runRobotWithConnection (moveBy x y) connection -- Chris Wong, fixpoint conjurer e: lambda.fa...@gmail.com w: http://lfairy.github.io/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: Robot - Simulate keyboard and mouse events under X11
I removed the functionality because I didn't really see a use for it anymore. The `hold` and `tap` functions are already exception safe (thanks to `bracket`), and anyone who uses the unguarded `press` function probably wants to keep it held down anyway. Chris On Tue, May 14, 2013 at 12:46 PM, Niklas Hambüchen m...@nh2.me wrote: Awesome, that works very well, and it even made my program run faster / with less CPU. The reset functionality is useful, but I think optional is better. Did you remove it entirely or is it still available? On Tue 14 May 2013 08:25:04 SGT, Chris Wong wrote: Oh, I see now. I originally made the runRobot functions reset the input state when the Robot finished running. That worked well for my use case (testing GUIs), but as you have noticed, it causes unintuitive behavior when runRobot is called at a high frequency. In hindsight, that was a design flaw on my part: that resetting behavior should be specified explicitly, not attached unconditionally to every call to runRobot. I've removed the offending code, and released it as version 1.1. Hopefully I've ironed out the issues now :) On Mon, May 13, 2013 at 12:49 PM, Niklas Hambüchen m...@nh2.me wrote: Can you show me the code that triggers that behavior? It is basically Just connection - connect forever $ do (x,y) - getGyroMovement runRobotWithConnection (moveBy x y) connection -- Chris Wong, fixpoint conjurer e: lambda.fa...@gmail.com w: http://lfairy.github.io/ -- Chris Wong, fixpoint conjurer e: lambda.fa...@gmail.com w: http://lfairy.github.io/ ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
