mjk的专栏

a :: Matrixa = [[2.0, 3.0, 4.0],     [5.0, 6.0, -1.0]]b :: Matrixb = [[1.0, 0.0],      [1.0, 1.0],     [0.0, -1.0]]matrixProduct :: Matrix -> Matrix -> MatrixmatrixProduct m p = [[ scalarProduct r c |

module Main whereimport Data.Charimport Data.Listimport System.Environmentimport System.FilePathimport Text.Parsecimport Text.Parsec.StringparaBeginSpace :: IntparaBeginSpace = 2main :: IO

<br />(define)<br />(display)<br />(newline)<br />[]<br />lambda<br />let<br /> <br /> 

<br />In general, use >> if the actions don’t return a value, >>= if you’ll be immediately passing that value into the next action, and do-notation otherwise.

<br />http://ertes.de/articles/monads.html<br /> Understanding Haskell Monads<br />Copyright © 2011 Ertugrul Söylemez<br />Version 1.04 (2011-04-20)<br />Haskell is a modern purely functional programming language, which is easy to learn, has a beautiful sy

<br />http://www.infoq.com/cn/interviews/paul-hudak-haskell<br /> 

<br /><br />toBS :: String ->BS.ByteString<br />toBS = BS.pack . map (fromIntegral . fromEnum)<br /> <br />fromBS :: BS.ByteString -> String<br />fromBS = map (toEnum . fromIntegral) . BS.unpack

<br />module Main where<br />import System.Environment(getArgs)<br />import qualified Data.ByteString as B (readFile, writeFile, map)<br />main = do<br />  args <- getArgs<br />  case args of<br />    [from, out, direction] -> <br />      case direction of

<br />module Main where<br />import System.Environment(getArgs)<br />import qualified Data.ByteString as B (readFile, writeFile, map)<br />main = do<br />  args <- getArgs<br />  case args of<br />    [from, out, direction] -> <br />      case direction of

<br />http://www.yi-programmer.com/blog/2010-04-06_haskell_and_category_translate.html#id24<br /> <br /> 白菜 - 精确编程  HomeBlogComments豆瓣九点Haskell与范畴论<br />用haskell的概念解释范畴论。翻译自 wikibook : http://en.wikibooks.org/wiki/Haskell/Category_theory<br />目录范畴论简介范畴公理Ha

cabal install gtk2hs-buildtools<br />sudo cp ~/.cabal/bin/gtk2hsC2hs /usr/bin<br /><br />sudo cp ~/.cabal/bin/gtk2hsHookGenerator /usr/bin<br /><br />sudo cp ~/.cabal/bin/gtk2hsTypeGen /usr/bin<br /><br />cabal install gtk<br /><br />cd ~/.cabal/sh

<br />sudo aptitude install gnome-core-devel build-essential<br /> pkg-config --cflags --libs gtk+-2.0

<br />http://blog.youkuaiyun.com/albert_lee/archive/2010/04/10/5469933.aspx<br /> <br />from albert_lee<br /> <br />   Haskell 几乎无痛苦上手指 收藏<br /> <br />趁着自己重装Linux 虚拟机的机会，把安装 haskell 的过程记录一下，顺便帮那些还犹豫徘徊在haskell门外的读者入门。基本概念：Haskell ： <br />是一门通用函数式语言，几

<br />http://sporkcode.wordpress.com/2009/07/11/installing-the-haskell-platform-in-ubuntu/<br />Code. Randomness. Sporks.<br /> Installing the Haskell Platform in Ubuntu<br />with 11 comments<br />After my previous article about installing Haskell’s Caba

import Random drawInt :: Int -> Int -> IO IntdrawInt x y = getStdRandom (randomR (x,y))random_list :: Int -> IO [Int]random_list 0 = return []random_list n = do    a     rest random_list(n-1))   

import Numericmypi = [(x, y)|x

from 《Real World Haskell》-- file: ch16/csv1.hsimport Text.ParserCombinators.Parsec{- A CSV file contains 0 or more lines, each of which is terminated by the end-of-line character (eol). -}csv