2

我阅读了有关该软件包的文档和一些文章,但是我是 Haskell 的新手并且不太了解,但我尝试了....

以下是我所做的:

module Main where  
{-# LANGUAGE BangPatterns #-}   
import Control.Parallel(par,pseq)  
import Control.Exception  
import Data.List  
import IO  
import Data.Char  
import Criterion.Main (defaultMain, bench)  

learquivo :: FilePath -> IO ([[Int]])  
learquivo "mkList1.txt"  = do   
    conteudo <- readFile "mkList1.txt" 
    return (read conteudo) 


main = defaultMain [  
    bench "map sort learquivo" $ \n -> map sort learquivo
    ]

因为它发生了以下错误:

Couldn't match expected type [[a]]
       against inferred type FilePath -> IO [[Int]]
4

2 回答 2

2

只要你知道我通常如何运行它,使用nforwhnf函数,我将给出我的代码:

import Data.List
import Criterion.Main

main :: IO ()
main = do
   -- content <- learquivo "mkList1.txt"  
   let content = [ [big, big - step.. 0] | big <- [1000..1010], step <- [1..5]] :: [[Int]]
   defaultMain
        [ bench "benchmark-name" (nf (map sort) content)]

编辑:如果你喜欢这个,那么也尝试一下:

module Main where

import Data.List
import Criterion.Main
import Criterion.Config
import Criterion.MultiMap as M

main :: IO ()
main = do
   let myConfig = defaultConfig {
              -- Always display an 800x600 window with curves.
              cfgPlot = M.singleton KernelDensity (Window 800 600)
              }
   let content = [ [big, big-step.. 0] | big <- [1000..1010], step <- [1..5]] :: [[Int]]
   defaultMainWith myConfig (return ())
        [ bench "benchmark-name" (nf (map sort) content)]
于 2010-10-27T15:05:35.230 回答
2

问题是这样的:map sort learquivo

sort需要一个列表,因此map sort需要一个列表列表 ( [[a]]),而 的类型learquivo是 type FilePath -> IO [[Int]]

你可能想要这样的东西:

main = do
    contents <- learquivo "mkList1.txt"
    defaultMain [
       bench "map sort learquivo" $ \n -> map sort contents
    ]

你的代码中有很多东西可以清理,但这应该能让你继续前进。

于 2010-10-27T13:32:17.210 回答