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Text processing/1: Difference between revisions
added Haskell
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main bye
</lang>
=={{header|Haskell}}==
<lang Haskell>import Data.List
import Numeric
import Control.Arrow
import Control.Monad
import Text.Printf
import System.Environment
type Date = String
type Value = Double
type Flag = Int
readFlg :: String -> Flag
readFlg xs@(x:ns) | x=='-' = 0
| otherwise = fromEnum $ (>"0")xs
readNum :: String -> Value
readNum = fst.head.readFloat
take2 = map fst.takeWhile(not.null.fst).drop 1.iterate (splitAt 2.snd).(,)[]
parseData :: [String] -> (Date,[(Value,Flag)])
parseData = head &&& map(readNum.head &&& readFlg.last).take2.tail
sumAccs :: (Date,[(Value,Flag)]) -> (Date, ((Value,Int),[Flag]))
sumAccs = second (((sum &&& length).concat.uncurry(zipWith(\v f -> [v|f==1])) &&& snd).unzip)
maxNAseq :: [Flag] -> [(Int,Int)]
maxNAseq = head.groupBy(\a b -> fst a==fst b).sortBy(flip compare)
. concat.uncurry(zipWith(\i (r,b)->[(r,i)|b==0]))
. first(init.scanl(+)0). unzip
. foldl' (\cs xs -> cs++[(fst &&& id)$(length &&& head)xs]) []. group
main = do
file:_ <- getArgs
f <- readFile file
let dat :: [(Date,((Value,Int),[Flag]))]
dat = map (sumAccs. parseData. words).lines $ f
summ = ((sum *** sum). unzip *** maxNAseq.concat). unzip $ map snd dat
totalFmt = "\nSummary\t\t accept: %d\t total: %.3f \taverage: %6.3f\n\n"
lineFmt = "%8s\t accept: %2d\t total: %11.3f \taverage: %6.3f\n"
maxFmt = "Maximum of %d consecutive false readings, starting on line /%s/ and ending on line /%s/\n"
-- output statistics
putStrLn "\nSome lines:\n"
mapM_ (\(d,((v,n),_)) -> printf lineFmt d n v ((v/fromIntegral n))) $ take 4 $ drop 2200 dat
(\(t,n) -> printf totalFmt n t (t/fromIntegral n)) $ fst summ
mapM_ ((\(l, d1,d2) -> printf maxFmt l d1 d2)
. (\(a,b)-> (a,(fst.(dat!!).(`div`24))b,(fst.(dat!!).(`div`24))(a+b)))) $ snd summ</lang>
Output:
<lang Haskell>*Main> :main ["./RC/readings.txt"]</lang>
<pre>Some lines:
1996-01-11 accept: 24 total: 437.000 average: 18.208
1996-01-12 accept: 24 total: 536.000 average: 22.333
1996-01-13 accept: 24 total: 1062.000 average: 44.250
1996-01-14 accept: 24 total: 787.000 average: 32.792
Summary accept: 129403 total: 1358393.400 average: 10.497
Maximum of 589 consecutive false readings, starting on line /1993-02-09/ and ending on line /1993-03-05/</pre>
=={{header|J}}==
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