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Today's Topics:
1. Re: haskell-platform on arch (Michael Xavier)
2. Re: haskell-platform on arch (Bernardo Barros)
3. Int V.S. Word32 (Haisheng Wu)
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Message: 1
Date: Fri, 18 Nov 2011 08:20:00 -0800
From: Michael Xavier <nemesisdes...@gmail.com>
Subject: Re: [Haskell-beginners] haskell-platform on arch
To: Vesa Kaihlavirta <vpkai...@gmail.com>
Cc: Haskell Beginners <beginners@haskell.org>
Message-ID:
<CANk=zmg-v7vbdwe5z8j_ywgpau+jja4bcuyudo+wwmmh4qu...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Thanks guys. I must have been a little confused by the difference between
platform and GHC. I was reading the Yesod book at the time which I think
(probably erroneously) mentions GHC 7.2 alongside recommending Haskell
Platform, which does not seem possible.
On Fri, Nov 18, 2011 at 1:29 AM, Vesa Kaihlavirta <vpkai...@gmail.com>wrote:
> On Fri, Nov 18, 2011 at 7:18 AM, Bernardo Barros
> <bernardobarr...@gmail.com> wrote:
> > The last release of Haskell Platform has ghc version 7.0.3. There
> > is nothing outdated in arch... You may be referring to the ghc
> > 7.2, right? It is not in Haskell Platform yet.
> >
> > ?? >> pacman -Ss haskell-platform extra/haskell-platform
> > 2011.2.0.0-4 [0.00 M] [installed] The Haskell Platform
>
> Yes, that's the reason why our ghc is lagging so much. In fact, we
> have plans to stop supporting the platform mainly for this reason.
>
> In the near future (hopefully in a month or so), the our extra
> repository would only contain the latest stable ghc (currently at
> 7.2.2) and cabal-install (plus its deps).
>
> --vk
>
--
Michael Xavier
http://www.michaelxavier.net
LinkedIn <http://www.linkedin.com/pub/michael-xavier/13/b02/a26>
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Message: 2
Date: Fri, 18 Nov 2011 09:53:16 -0800
From: Bernardo Barros <bernardobarr...@gmail.com>
Subject: Re: [Haskell-beginners] haskell-platform on arch
To: Michael Xavier <nemesisdes...@gmail.com>
Cc: Haskell Beginners <beginners@haskell.org>
Message-ID:
<caoeekgvhzmjx344ja+eu1ctup4ncjvfq4s+tjmfogeqybse...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
actually haskell-platform is an empty package with a set of
dependencies (ghc, cabal, haddock etc)
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Message: 3
Date: Sat, 19 Nov 2011 16:09:50 +0800
From: Haisheng Wu <fre...@gmail.com>
Subject: [Haskell-beginners] Int V.S. Word32
To: Haskell Beginer <beginners@haskell.org>
Message-ID:
<cafj8lzdhbc+hrxuidmkco2edb3qd8ds2gtjryjdddgipzr4...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello,
I got great performance difference for the following code if I used type
`Int` rather than `Data.Word.Word32`.
Anyone can help to explain why such difference?
Thanks a lot.
-Simon
module Main where
import Data.Word
main :: IO ()
main = print $ p14
p14 = maximum [ (startChain n 0, n) | n <- [2..1000000] ]
startChain :: Word32 -> Int -> Int
startChain 1 count = count + 1
startChain n count = startChain (intTransform n) (count+1)
intTransform :: Word32 -> Word32
intTransform n
| even n = n `div` 2
| otherwise = 3 * n + 1
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