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Updated README, added Ch02 content
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@ -7,18 +7,19 @@ Refer to the book for step-by-step explanations.
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<p align="center"><a href="http://haskelldata.com" target="_blank"><img src="http://haskelldata.com/images/ch01.png"/></a></p>
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# Recipes
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* **Code01**: Accumulating text data from a file path
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* **Code02**: Catching I/O code faults
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* **Code03**: Keeping and representing data from a CSV file
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* **Code04**: Examining a JSON file with the aeson package
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* **Code05**: Reading an XML file using the HXT package
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* **Code06**: Capturing table rows from an HTML page
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* **Code07**: Understanding how to perform HTTP GET requests
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* **Code08**: Learning how to perform HTTP POST requests
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* **Code09**: Traversing online directories for data
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* **Code10**: Using MongoDB queries in Haskell
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* **Code11**: Reading from a remote MongoDB server
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* **Code12**: Exploring data from a SQLite database
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* **Code01**: Harnessing data from various sources *(not included)*
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* **Code02**: Accumulating text data from a file path
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* **Code03**: Catching I/O code faults
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* **Code04**: Keeping and representing data from a CSV file
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* **Code05**: Examining a JSON file with the aeson package
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* **Code06**: Reading an XML file using the HXT package
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* **Code07**: Capturing table rows from an HTML page
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* **Code08**: Understanding how to perform HTTP GET requests
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* **Code09**: Learning how to perform HTTP POST requests
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* **Code10**: Traversing online directories for data
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* **Code11**: Using MongoDB queries in Haskell
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* **Code12**: Reading from a remote MongoDB server
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* **Code13**: Exploring data from a SQLite database
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# How to use
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### Setting up the environment
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25
Ch02/Code01_whitespace/Code0201.cabal
Normal file
25
Ch02/Code01_whitespace/Code0201.cabal
Normal file
@ -0,0 +1,25 @@
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-- Initial Code0201.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0201
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version: 0.1.0.0
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synopsis: Trimming excess whitespace.
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Text
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0201
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main-is: Main.hs
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.6 && <4.7
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-- hs-source-dirs:
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default-language: Haskell2010
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9
Ch02/Code01_whitespace/Main.hs
Normal file
9
Ch02/Code01_whitespace/Main.hs
Normal file
@ -0,0 +1,9 @@
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import Data.Char (isSpace)
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-- Trims whitespace
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trim :: String -> String
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trim = f . f
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where f = reverse . dropWhile isSpace
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main :: IO ()
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main = putStrLn $ trim " wahoowa! "
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5
Ch02/Code01_whitespace/Makefile
Normal file
5
Ch02/Code01_whitespace/Makefile
Normal file
@ -0,0 +1,5 @@
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0201 *~
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25
Ch02/Code02_punctuation/Code0202.cabal
Normal file
25
Ch02/Code02_punctuation/Code0202.cabal
Normal file
@ -0,0 +1,25 @@
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-- Initial Code0202.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0202
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version: 0.1.0.0
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synopsis: Ignoring punctuation and special characters
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Text
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0202
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main-is: Main.hs
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.6 && <4.7, MissingH >=1.2 && <1.3
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-- hs-source-dirs:
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default-language: Haskell2010
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17
Ch02/Code02_punctuation/Main.hs
Normal file
17
Ch02/Code02_punctuation/Main.hs
Normal file
@ -0,0 +1,17 @@
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-- Cleans up a sentence
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main :: IO ()
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main = do
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let quote = "Deep Blue plays very good chess-so what?\
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\Does that tell you something about how we play chess?\
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\ No. Does it tell you about how Kasparov envisions,\
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\ understands a chessboard? (Douglas Hofstadter)"
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putStrLn $ (removePunctuation.replaceSpecialSymbols) quote
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-- Removes punctuation
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punctuations = ['!', '"', '#', '$', '%', '(', ')', '.', ',', '?']
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removePunctuation = filter (`notElem` punctuations)
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-- Replaces some symbols with a space
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specialSymbols = ['/', '-']
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replaceSpecialSymbols = map $ (\c -> if c `elem` specialSymbols
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then ' ' else c)
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15
Ch02/Code02_punctuation/Main2.hs
Normal file
15
Ch02/Code02_punctuation/Main2.hs
Normal file
@ -0,0 +1,15 @@
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import Data.String.Utils (replace)
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-- Cleans up a sentence
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main :: IO ()
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main = do
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let quote = "Deep Blue plays very good chess-so what? Does that tell you something about how we play chess? No. Does it tell you about how Kasparov envisions, understands a chessboard? (Douglas Hofstadter)"
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print $ (removePunctuation.replaceSpecialSymbols) quote
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-- Removes punctuation using the `replace` function
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removePunctuation = foldr (.) id $ map (flip replace "")
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["!", "\"", "#", "$", "%", "(", ")", ".", ",", "?"]
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-- Replaces some symbols with a space using `replace`
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replaceSpecialSymbols = foldr (.) id $ map (flip replace " ")
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["/", "-"]
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5
Ch02/Code02_punctuation/Makefile
Normal file
5
Ch02/Code02_punctuation/Makefile
Normal file
@ -0,0 +1,5 @@
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0202 *~
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25
Ch02/Code03_unexpected/Code0203.cabal
Normal file
25
Ch02/Code03_unexpected/Code0203.cabal
Normal file
@ -0,0 +1,25 @@
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-- Initial Code0203.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0203
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version: 0.1.0.0
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synopsis: Coping with unexpected or missing input.
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Text
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0203
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main-is: Main.hs
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.6 && <4.7, csv >=0.1 && <0.2
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-- hs-source-dirs:
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default-language: Haskell2010
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36
Ch02/Code03_unexpected/Main.hs
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36
Ch02/Code03_unexpected/Main.hs
Normal file
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import Text.CSV
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data Laptop = Laptop { brand :: Maybe String
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, model :: Maybe String
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, cost :: Maybe Float
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} deriving Show
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-- Parses an incomplete CSV
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main :: IO ()
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main = do
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let fileName = "input.csv"
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input <- readFile fileName
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let csv = parseCSV fileName input
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let laptops = parseLaptops csv
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print laptops
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parseLaptops (Left err) = []
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parseLaptops (Right csv) =
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foldl (\a record -> if length record == 3
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then (parseLaptop record):a
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else a) [] csv
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parseLaptop record = Laptop { brand = getBrand $ record !! 0,
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model = getModel $ record !! 1,
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cost = getCost $ record !! 2 }
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getBrand :: String -> Maybe String
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getBrand str = if null str then Nothing else Just str
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getModel :: String -> Maybe String
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getModel str = if null str then Nothing else Just str
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getCost :: String -> Maybe Float
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getCost str = case reads str::[(Float,String)] of
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[(cost, "")] -> Just cost
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_ -> Nothing
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5
Ch02/Code03_unexpected/Makefile
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5
Ch02/Code03_unexpected/Makefile
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0203 *~
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3
Ch02/Code03_unexpected/input.csv
Normal file
3
Ch02/Code03_unexpected/input.csv
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Lenovo Thinkpad,T540p,832.15
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Lenovo Thinkpad,X1 Carbon,
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Lenovo IdeaPad,,949.00
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25
Ch02/Code04_regex/Code0204.cabal
Normal file
25
Ch02/Code04_regex/Code0204.cabal
Normal file
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-- Initial Code0204.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0204
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version: 0.1.0.0
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synopsis: Regular expression example.
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Text
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0204
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main-is: Main.hs
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.6 && <4.7, regex-posix >=0.95 && <0.96
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-- hs-source-dirs:
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default-language: Haskell2010
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25
Ch02/Code04_regex/Main.hs
Normal file
25
Ch02/Code04_regex/Main.hs
Normal file
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import Text.Regex.Posix ((=~))
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looksLikeName :: String -> Bool
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looksLikeName str = str =~ "^[A-Z][a-z]{1,30}$" :: Bool
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punctuations = ['!', '"', '#', '$', '%', '(', ')', '.', ',', '?']
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removePunctuation = filter (`notElem` punctuations)
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specialSymbols = ['/', '-']
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replaceSpecialSymbols = map $ (\c -> if c `elem` specialSymbols
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then ' ' else c)
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createTuples (x:y:xs) = (x ++ " " ++ y) : createTuples (y:xs)
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createTuples _ = []
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-- Matches a regular expression to find names
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main :: IO ()
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main = do
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input <- readFile "input.txt"
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let cleanInput = (removePunctuation.replaceSpecialSymbols) input
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let wordPairs = createTuples $ words cleanInput
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let possibleNames =
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filter (all looksLikeName . words) wordPairs
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print possibleNames
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5
Ch02/Code04_regex/Makefile
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5
Ch02/Code04_regex/Makefile
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0204 *~
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1
Ch02/Code04_regex/input.txt
Normal file
1
Ch02/Code04_regex/input.txt
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Other co-authors of Dr. Erickson's include Mark Norell, chairman of paleontology at the American Museum of Natural History; Philip Currie, a professor of dinosaur paleobiology at the University of Alberta; and Peter Makovicky, associate curator of paleontology at the Field Museum in Chicago.
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25
Ch02/Code05_lex/Code0205.cabal
Normal file
25
Ch02/Code05_lex/Code0205.cabal
Normal file
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-- Initial Code0205.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0205
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version: 0.1.0.0
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synopsis: Parsing an email address.
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Text
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0205
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main-is: Main.hs
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-- other-modules:
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other-extensions: OverloadedStrings
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build-depends: base >=4.6 && <4.7, attoparsec >=0.10 && <0.11
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-- hs-source-dirs:
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default-language: Haskell2010
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23
Ch02/Code05_lex/Main.hs
Normal file
23
Ch02/Code05_lex/Main.hs
Normal file
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{-# LANGUAGE OverloadedStrings #-}
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import Data.Attoparsec.Text
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import Data.Char (isSpace, isAlphaNum)
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data Email = Email
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{ user :: String
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, host :: String
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} deriving Show
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email :: Parser Email
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email = do
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skipSpace
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user <- many' $ satisfy isAlphaNum
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at <- char '@'
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hostName <- many' $ satisfy isAlphaNum
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period <- char '.'
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domain <- many' (satisfy isAlphaNum)
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return $ Email user (hostName ++ "." ++ domain)
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-- Lexes and parses an email address
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main :: IO ()
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main = print $ parseOnly email "nishant@shukla.io"
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5
Ch02/Code05_lex/Makefile
Normal file
5
Ch02/Code05_lex/Makefile
Normal file
@ -0,0 +1,5 @@
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0205 *~
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25
Ch02/Code06_combining/Code0206.cabal
Normal file
25
Ch02/Code06_combining/Code0206.cabal
Normal file
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-- Initial Code0206.cabal generated by cabal init. For further
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-- documentation, see http://haskell.org/cabal/users-guide/
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name: Code0206
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version: 0.1.0.0
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synopsis: Combining data records together.
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-- description:
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homepage: haskelldata.com
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license: GPL-2
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license-file: ../LICENSE
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author: Nishant Shukla
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maintainer: nick722@gmail.com
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-- copyright:
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category: Data
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build-type: Simple
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-- extra-source-files:
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cabal-version: >=1.10
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executable Code0206
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main-is: Main.hs
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.6 && <4.7, csv >=0.1 && <0.2, containers >=0.5 && <0.6
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-- hs-source-dirs:
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default-language: Haskell2010
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40
Ch02/Code06_combining/Main.hs
Normal file
40
Ch02/Code06_combining/Main.hs
Normal file
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import Text.CSV (parseCSV, Record)
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import Data.Map (fromListWith)
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import Control.Applicative ((<|>))
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data Item = Item { name :: String
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, color :: String
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, cost :: Maybe Float
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} deriving Show
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-- Combines CSV fields from duplicated data
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main :: IO ()
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main = do
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let fileName = "input.csv"
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input <- readFile fileName
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let csv = parseCSV fileName input
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either handleError doWork csv
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handleError = print
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doWork :: [Record] -> IO ()
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doWork csv = print $ fromListWith combine $ map parseToTuple csv
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combine :: Item -> Item -> Item
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combine item1 item2 = Item { name = name item1
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, color = color item1 <|> color item2
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, cost = cost item1 <|> cost item2 }
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parseToTuple :: Record -> (String, Item)
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parseToTuple record = (name item, item)
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where item = parseItem record
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parseItem :: Record -> Item
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parseItem record =
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Item { name = record !! 0
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, color = record !! 1
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, cost = case reads (record !! 2)::[(Float,String)] of
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[(c, "")] -> Just c
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_ -> Nothing
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}
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5
Ch02/Code06_combining/Makefile
Normal file
5
Ch02/Code06_combining/Makefile
Normal file
@ -0,0 +1,5 @@
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default:
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cabal install --bindir=./
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clean:
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rm -rf dist Setup.hs Code0206 *~
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6
Ch02/Code06_combining/input.csv
Normal file
6
Ch02/Code06_combining/input.csv
Normal file
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glasses,,60.00
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jacket,brown,
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shirt,,
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glasses,black,
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jacket,,89.99
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shirt,red,15.00
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25
Ch02/Code07_dedup/Code0207.cabal
Normal file
25
Ch02/Code07_dedup/Code0207.cabal
Normal file
@ -0,0 +1,25 @@
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-- Initial Code0207.cabal generated by cabal init. For further
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||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
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name: Code0207
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version: 0.1.0.0
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||||
synopsis: Deduplicating conflicting data.
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||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
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||||
license-file: ../LICENSE
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||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Data
|
||||
build-type: Simple
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||||
-- extra-source-files:
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cabal-version: >=1.10
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||||
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||||
executable Code0207
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7, csv >=0.1 && <0.2, containers >=0.5 && <0.6
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
47
Ch02/Code07_dedup/Main.hs
Normal file
47
Ch02/Code07_dedup/Main.hs
Normal file
@ -0,0 +1,47 @@
|
||||
import Text.CSV (parseCSV, Record)
|
||||
import Data.Map (fromListWith)
|
||||
import qualified Data.Set as S
|
||||
|
||||
data Artist = Artist { name :: String
|
||||
, song :: S.Set String
|
||||
, genre :: S.Set String
|
||||
} deriving Show
|
||||
|
||||
-- Combines duplicated CSV data into a set
|
||||
main :: IO ()
|
||||
main = do
|
||||
let fileName = "input.csv"
|
||||
input <- readFile fileName
|
||||
let csv = parseCSV fileName input
|
||||
either handleError doWork csv
|
||||
|
||||
handleError = print
|
||||
|
||||
doWork :: [Record] -> IO ()
|
||||
doWork csv = print $ fromListWith combine $ map parseToTuple csv
|
||||
|
||||
combine :: Artist -> Artist -> Artist
|
||||
combine artist1 artist2 =
|
||||
Artist { name = name artist1
|
||||
, song = S.union (song artist1) (song artist2)
|
||||
, genre = S.union (genre artist1) (genre artist2) }
|
||||
|
||||
parseToTuple :: [String] -> (String, Artist)
|
||||
parseToTuple record = (name item, item)
|
||||
where item = parseItem record
|
||||
|
||||
parseItem :: Record -> Artist
|
||||
parseItem record =
|
||||
Artist { name = nameStr
|
||||
, song = if null songStr
|
||||
then S.empty
|
||||
else S.singleton songStr
|
||||
, genre = if null genreStr
|
||||
then S.empty
|
||||
else S.singleton genreStr
|
||||
}
|
||||
where nameStr = record !! 0
|
||||
songStr = record !! 1
|
||||
genreStr = record !! 2
|
||||
|
||||
|
5
Ch02/Code07_dedup/Makefile
Normal file
5
Ch02/Code07_dedup/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0207 *~
|
6
Ch02/Code07_dedup/input.csv
Normal file
6
Ch02/Code07_dedup/input.csv
Normal file
@ -0,0 +1,6 @@
|
||||
Daft Punk,Around the World,French house
|
||||
Madeon,Icarus,French house
|
||||
Daft Punk,Get Lucky,
|
||||
Justice,Genesis,Electro
|
||||
Junior Boys,Bits & Pieces,Synthpop
|
||||
Justice,,Electronic rock
|
|
25
Ch02/Code08_freq/Code0208.cabal
Normal file
25
Ch02/Code08_freq/Code0208.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0208.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0208
|
||||
version: 0.1.0.0
|
||||
synopsis: Creating a frequency map.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Data
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0208
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
10
Ch02/Code08_freq/Main.hs
Normal file
10
Ch02/Code08_freq/Main.hs
Normal file
@ -0,0 +1,10 @@
|
||||
import Data.List (group, sort)
|
||||
|
||||
data Color = Red | Green | Blue deriving (Show, Ord, Eq)
|
||||
|
||||
-- Generates a frequency map from a list of items
|
||||
main :: IO ()
|
||||
main = do
|
||||
let items = [Red, Green, Green, Blue, Red, Green, Green]
|
||||
let freq = map (\x -> (head x, length x)) . group . sort $ items
|
||||
print freq
|
5
Ch02/Code08_freq/Makefile
Normal file
5
Ch02/Code08_freq/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0208 *~
|
25
Ch02/Code09_freq2/Code0209.cabal
Normal file
25
Ch02/Code09_freq2/Code0209.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0209.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0209
|
||||
version: 0.1.0.0
|
||||
synopsis: Using multiset frequency map.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Data
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0209
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7, multiset >=0.2 && <0.3
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
10
Ch02/Code09_freq2/Main.hs
Normal file
10
Ch02/Code09_freq2/Main.hs
Normal file
@ -0,0 +1,10 @@
|
||||
import Data.MultiSet (fromList, toOccurList)
|
||||
|
||||
data Color = Red | Green | Blue deriving (Show, Ord, Eq)
|
||||
|
||||
-- Generates a frequency map using Data.MultiSet
|
||||
main :: IO ()
|
||||
main = do
|
||||
let items = [Red, Green, Green, Blue, Red, Green, Green]
|
||||
let freq = toOccurList . fromList $ items
|
||||
print freq
|
5
Ch02/Code09_freq2/Makefile
Normal file
5
Ch02/Code09_freq2/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0209 *~
|
25
Ch02/Code10_manhattan/Code0210.cabal
Normal file
25
Ch02/Code10_manhattan/Code0210.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0210.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0210
|
||||
version: 0.1.0.0
|
||||
synopsis: Calculating the Manhattan distance.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Math
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0210
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7, csv >=0.1 && <0.2
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
22
Ch02/Code10_manhattan/Main.hs
Normal file
22
Ch02/Code10_manhattan/Main.hs
Normal file
@ -0,0 +1,22 @@
|
||||
import Text.CSV (parseCSV)
|
||||
|
||||
-- Computes the Manhattan distance
|
||||
main :: IO ()
|
||||
main = do
|
||||
let fileName = "input.csv"
|
||||
input <- readFile fileName
|
||||
let csv = parseCSV fileName input
|
||||
let points = either (\e -> []) (map toPoint . myFilter) csv
|
||||
let test1 = [2,1]
|
||||
let test2 = [-10,-10]
|
||||
if (not.null) points then do
|
||||
print $ minimum $ map (manhattanDist test1) points
|
||||
print $ minimum $ map (manhattanDist test2) points
|
||||
else putStrLn "Error: no points to compare"
|
||||
|
||||
toPoint record = map (read :: String -> Float) record
|
||||
|
||||
manhattanDist p1 p2 = sum $ zipWith (\x y -> abs (x - y)) p1 p2
|
||||
|
||||
myFilter = filter (\x -> length x == 2)
|
||||
|
5
Ch02/Code10_manhattan/Makefile
Normal file
5
Ch02/Code10_manhattan/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0210 *~
|
5
Ch02/Code10_manhattan/input.csv
Normal file
5
Ch02/Code10_manhattan/input.csv
Normal file
@ -0,0 +1,5 @@
|
||||
0,0
|
||||
10,0
|
||||
0,10
|
||||
10,10
|
||||
5,5
|
|
25
Ch02/Code11_euclid/Code0211.cabal
Normal file
25
Ch02/Code11_euclid/Code0211.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0211.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0211
|
||||
version: 0.1.0.0
|
||||
synopsis: Computing the Euclidian distance.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Math
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0211
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7, csv >=0.1 && <0.2
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
21
Ch02/Code11_euclid/Main.hs
Normal file
21
Ch02/Code11_euclid/Main.hs
Normal file
@ -0,0 +1,21 @@
|
||||
import Text.CSV (parseCSV)
|
||||
|
||||
-- Computes the Euclidian distance
|
||||
main :: IO ()
|
||||
main = do
|
||||
let fileName = "input.csv"
|
||||
input <- readFile fileName
|
||||
let csv = parseCSV fileName input
|
||||
let points = either (\e -> []) (map toPoint . myFilter) csv
|
||||
let test1 = [2,1]
|
||||
let test2 = [-10,-10]
|
||||
if (not.null) points then do
|
||||
print $ minimum $ map (euclidianDist test1) points
|
||||
print $ minimum $ map (euclidianDist test2) points
|
||||
else putStrLn "Error: no points to compare"
|
||||
|
||||
toPoint record = map (\x -> read x :: Float) record
|
||||
|
||||
euclidianDist p1 p2 = sqrt $ sum $ zipWith (\x y -> (x - y)^2) p1 p2
|
||||
|
||||
myFilter = filter (\x -> length x == 2)
|
5
Ch02/Code11_euclid/Makefile
Normal file
5
Ch02/Code11_euclid/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0211 *~
|
5
Ch02/Code11_euclid/input.csv
Normal file
5
Ch02/Code11_euclid/input.csv
Normal file
@ -0,0 +1,5 @@
|
||||
0,0
|
||||
10,0
|
||||
0,10
|
||||
10,10
|
||||
5,5
|
|
25
Ch02/Code12_pearson/Code0212.cabal
Normal file
25
Ch02/Code12_pearson/Code0212.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0212.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0212
|
||||
version: 0.1.0.0
|
||||
synopsis: Calculating the Pearson Correlation Coefficient.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Math
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0212
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
18
Ch02/Code12_pearson/Main.hs
Normal file
18
Ch02/Code12_pearson/Main.hs
Normal file
@ -0,0 +1,18 @@
|
||||
-- Computes the Pearson coefficient
|
||||
main :: IO ()
|
||||
main = do
|
||||
let d1 = [3,3,3,4,4,4,5,5,5]
|
||||
let d2 = [1,1,2,2,3,4,4,5,5]
|
||||
let r = pearson d1 d2
|
||||
print r
|
||||
|
||||
pearson xs ys = (n * sumXY - sumX * sumY) /
|
||||
sqrt ( (n * sumX2 - sumX*sumX) *
|
||||
(n * sumY2 - sumY*sumY) )
|
||||
where n = fromIntegral (length xs)
|
||||
sumX = sum xs
|
||||
sumY = sum ys
|
||||
sumX2 = sum $ zipWith (*) xs xs
|
||||
sumY2 = sum $ zipWith (*) ys ys
|
||||
sumXY = sum $ zipWith (*) xs ys
|
||||
|
5
Ch02/Code12_pearson/Makefile
Normal file
5
Ch02/Code12_pearson/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0212 *~
|
25
Ch02/Code13_cos/Code0213.cabal
Normal file
25
Ch02/Code13_cos/Code0213.cabal
Normal file
@ -0,0 +1,25 @@
|
||||
-- Initial Code0213.cabal generated by cabal init. For further
|
||||
-- documentation, see http://haskell.org/cabal/users-guide/
|
||||
|
||||
name: Code0213
|
||||
version: 0.1.0.0
|
||||
synopsis: Computing cosine similarity.
|
||||
-- description:
|
||||
homepage: haskelldata.com
|
||||
license: GPL-2
|
||||
license-file: ../LICENSE
|
||||
author: Nishant Shukla
|
||||
maintainer: nick722@gmail.com
|
||||
-- copyright:
|
||||
category: Math
|
||||
build-type: Simple
|
||||
-- extra-source-files:
|
||||
cabal-version: >=1.10
|
||||
|
||||
executable Code0213
|
||||
main-is: Main.hs
|
||||
-- other-modules:
|
||||
-- other-extensions:
|
||||
build-depends: base >=4.6 && <4.7
|
||||
-- hs-source-dirs:
|
||||
default-language: Haskell2010
|
10
Ch02/Code13_cos/Main.hs
Normal file
10
Ch02/Code13_cos/Main.hs
Normal file
@ -0,0 +1,10 @@
|
||||
-- Computes the cosine similarity
|
||||
main :: IO ()
|
||||
main = do
|
||||
let d1 = [3.5, 2, 0, 4.5, 5, 1.5, 2.5, 2]
|
||||
let d2 = [3, 0, 0, 5, 4, 2.5, 3, 0]
|
||||
let similarity = dot d1 d2 / (eLen d1 * eLen d2)
|
||||
print similarity
|
||||
|
||||
dot a b = sum $ zipWith (*) a b
|
||||
eLen a = sqrt $ dot a a
|
5
Ch02/Code13_cos/Makefile
Normal file
5
Ch02/Code13_cos/Makefile
Normal file
@ -0,0 +1,5 @@
|
||||
default:
|
||||
cabal install --bindir=./
|
||||
|
||||
clean:
|
||||
rm -rf dist Setup.hs Code0213 *~
|
339
Ch02/LICENSE
Normal file
339
Ch02/LICENSE
Normal file
@ -0,0 +1,339 @@
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
License is intended to guarantee your freedom to share and change free
|
||||
software--to make sure the software is free for all its users. This
|
||||
General Public License applies to most of the Free Software
|
||||
Foundation's software and to any other program whose authors commit to
|
||||
using it. (Some other Free Software Foundation software is covered by
|
||||
the GNU Lesser General Public License instead.) You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
this service if you wish), that you receive source code or can get it
|
||||
if you want it, that you can change the software or use pieces of it
|
||||
in new free programs; and that you know you can do these things.
|
||||
|
||||
To protect your rights, we need to make restrictions that forbid
|
||||
anyone to deny you these rights or to ask you to surrender the rights.
|
||||
These restrictions translate to certain responsibilities for you if you
|
||||
distribute copies of the software, or if you modify it.
|
||||
|
||||
For example, if you distribute copies of such a program, whether
|
||||
gratis or for a fee, you must give the recipients all the rights that
|
||||
you have. You must make sure that they, too, receive or can get the
|
||||
source code. And you must show them these terms so they know their
|
||||
rights.
|
||||
|
||||
We protect your rights with two steps: (1) copyright the software, and
|
||||
(2) offer you this license which gives you legal permission to copy,
|
||||
distribute and/or modify the software.
|
||||
|
||||
Also, for each author's protection and ours, we want to make certain
|
||||
that everyone understands that there is no warranty for this free
|
||||
software. If the software is modified by someone else and passed on, we
|
||||
want its recipients to know that what they have is not the original, so
|
||||
that any problems introduced by others will not reflect on the original
|
||||
authors' reputations.
|
||||
|
||||
Finally, any free program is threatened constantly by software
|
||||
patents. We wish to avoid the danger that redistributors of a free
|
||||
program will individually obtain patent licenses, in effect making the
|
||||
program proprietary. To prevent this, we have made it clear that any
|
||||
patent must be licensed for everyone's free use or not licensed at all.
|
||||
|
||||
The precise terms and conditions for copying, distribution and
|
||||
modification follow.
|
||||
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
|
||||
|
||||
0. This License applies to any program or other work which contains
|
||||
a notice placed by the copyright holder saying it may be distributed
|
||||
under the terms of this General Public License. The "Program", below,
|
||||
refers to any such program or work, and a "work based on the Program"
|
||||
means either the Program or any derivative work under copyright law:
|
||||
that is to say, a work containing the Program or a portion of it,
|
||||
either verbatim or with modifications and/or translated into another
|
||||
language. (Hereinafter, translation is included without limitation in
|
||||
the term "modification".) Each licensee is addressed as "you".
|
||||
|
||||
Activities other than copying, distribution and modification are not
|
||||
covered by this License; they are outside its scope. The act of
|
||||
running the Program is not restricted, and the output from the Program
|
||||
is covered only if its contents constitute a work based on the
|
||||
Program (independent of having been made by running the Program).
|
||||
Whether that is true depends on what the Program does.
|
||||
|
||||
1. You may copy and distribute verbatim copies of the Program's
|
||||
source code as you receive it, in any medium, provided that you
|
||||
conspicuously and appropriately publish on each copy an appropriate
|
||||
copyright notice and disclaimer of warranty; keep intact all the
|
||||
notices that refer to this License and to the absence of any warranty;
|
||||
and give any other recipients of the Program a copy of this License
|
||||
along with the Program.
|
||||
|
||||
You may charge a fee for the physical act of transferring a copy, and
|
||||
you may at your option offer warranty protection in exchange for a fee.
|
||||
|
||||
2. You may modify your copy or copies of the Program or any portion
|
||||
of it, thus forming a work based on the Program, and copy and
|
||||
distribute such modifications or work under the terms of Section 1
|
||||
above, provided that you also meet all of these conditions:
|
||||
|
||||
a) You must cause the modified files to carry prominent notices
|
||||
stating that you changed the files and the date of any change.
|
||||
|
||||
b) You must cause any work that you distribute or publish, that in
|
||||
whole or in part contains or is derived from the Program or any
|
||||
part thereof, to be licensed as a whole at no charge to all third
|
||||
parties under the terms of this License.
|
||||
|
||||
c) If the modified program normally reads commands interactively
|
||||
when run, you must cause it, when started running for such
|
||||
interactive use in the most ordinary way, to print or display an
|
||||
announcement including an appropriate copyright notice and a
|
||||
notice that there is no warranty (or else, saying that you provide
|
||||
a warranty) and that users may redistribute the program under
|
||||
these conditions, and telling the user how to view a copy of this
|
||||
License. (Exception: if the Program itself is interactive but
|
||||
does not normally print such an announcement, your work based on
|
||||
the Program is not required to print an announcement.)
|
||||
|
||||
These requirements apply to the modified work as a whole. If
|
||||
identifiable sections of that work are not derived from the Program,
|
||||
and can be reasonably considered independent and separate works in
|
||||
themselves, then this License, and its terms, do not apply to those
|
||||
sections when you distribute them as separate works. But when you
|
||||
distribute the same sections as part of a whole which is a work based
|
||||
on the Program, the distribution of the whole must be on the terms of
|
||||
this License, whose permissions for other licensees extend to the
|
||||
entire whole, and thus to each and every part regardless of who wrote it.
|
||||
|
||||
Thus, it is not the intent of this section to claim rights or contest
|
||||
your rights to work written entirely by you; rather, the intent is to
|
||||
exercise the right to control the distribution of derivative or
|
||||
collective works based on the Program.
|
||||
|
||||
In addition, mere aggregation of another work not based on the Program
|
||||
with the Program (or with a work based on the Program) on a volume of
|
||||
a storage or distribution medium does not bring the other work under
|
||||
the scope of this License.
|
||||
|
||||
3. You may copy and distribute the Program (or a work based on it,
|
||||
under Section 2) in object code or executable form under the terms of
|
||||
Sections 1 and 2 above provided that you also do one of the following:
|
||||
|
||||
a) Accompany it with the complete corresponding machine-readable
|
||||
source code, which must be distributed under the terms of Sections
|
||||
1 and 2 above on a medium customarily used for software interchange; or,
|
||||
|
||||
b) Accompany it with a written offer, valid for at least three
|
||||
years, to give any third party, for a charge no more than your
|
||||
cost of physically performing source distribution, a complete
|
||||
machine-readable copy of the corresponding source code, to be
|
||||
distributed under the terms of Sections 1 and 2 above on a medium
|
||||
customarily used for software interchange; or,
|
||||
|
||||
c) Accompany it with the information you received as to the offer
|
||||
to distribute corresponding source code. (This alternative is
|
||||
allowed only for noncommercial distribution and only if you
|
||||
received the program in object code or executable form with such
|
||||
an offer, in accord with Subsection b above.)
|
||||
|
||||
The source code for a work means the preferred form of the work for
|
||||
making modifications to it. For an executable work, complete source
|
||||
code means all the source code for all modules it contains, plus any
|
||||
associated interface definition files, plus the scripts used to
|
||||
control compilation and installation of the executable. However, as a
|
||||
special exception, the source code distributed need not include
|
||||
anything that is normally distributed (in either source or binary
|
||||
form) with the major components (compiler, kernel, and so on) of the
|
||||
operating system on which the executable runs, unless that component
|
||||
itself accompanies the executable.
|
||||
|
||||
If distribution of executable or object code is made by offering
|
||||
access to copy from a designated place, then offering equivalent
|
||||
access to copy the source code from the same place counts as
|
||||
distribution of the source code, even though third parties are not
|
||||
compelled to copy the source along with the object code.
|
||||
|
||||
4. You may not copy, modify, sublicense, or distribute the Program
|
||||
except as expressly provided under this License. Any attempt
|
||||
otherwise to copy, modify, sublicense or distribute the Program is
|
||||
void, and will automatically terminate your rights under this License.
|
||||
However, parties who have received copies, or rights, from you under
|
||||
this License will not have their licenses terminated so long as such
|
||||
parties remain in full compliance.
|
||||
|
||||
5. You are not required to accept this License, since you have not
|
||||
signed it. However, nothing else grants you permission to modify or
|
||||
distribute the Program or its derivative works. These actions are
|
||||
prohibited by law if you do not accept this License. Therefore, by
|
||||
modifying or distributing the Program (or any work based on the
|
||||
Program), you indicate your acceptance of this License to do so, and
|
||||
all its terms and conditions for copying, distributing or modifying
|
||||
the Program or works based on it.
|
||||
|
||||
6. Each time you redistribute the Program (or any work based on the
|
||||
Program), the recipient automatically receives a license from the
|
||||
original licensor to copy, distribute or modify the Program subject to
|
||||
these terms and conditions. You may not impose any further
|
||||
restrictions on the recipients' exercise of the rights granted herein.
|
||||
You are not responsible for enforcing compliance by third parties to
|
||||
this License.
|
||||
|
||||
7. If, as a consequence of a court judgment or allegation of patent
|
||||
infringement or for any other reason (not limited to patent issues),
|
||||
conditions are imposed on you (whether by court order, agreement or
|
||||
otherwise) that contradict the conditions of this License, they do not
|
||||
excuse you from the conditions of this License. If you cannot
|
||||
distribute so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you
|
||||
may not distribute the Program at all. For example, if a patent
|
||||
license would not permit royalty-free redistribution of the Program by
|
||||
all those who receive copies directly or indirectly through you, then
|
||||
the only way you could satisfy both it and this License would be to
|
||||
refrain entirely from distribution of the Program.
|
||||
|
||||
If any portion of this section is held invalid or unenforceable under
|
||||
any particular circumstance, the balance of the section is intended to
|
||||
apply and the section as a whole is intended to apply in other
|
||||
circumstances.
|
||||
|
||||
It is not the purpose of this section to induce you to infringe any
|
||||
patents or other property right claims or to contest validity of any
|
||||
such claims; this section has the sole purpose of protecting the
|
||||
integrity of the free software distribution system, which is
|
||||
implemented by public license practices. Many people have made
|
||||
generous contributions to the wide range of software distributed
|
||||
through that system in reliance on consistent application of that
|
||||
system; it is up to the author/donor to decide if he or she is willing
|
||||
to distribute software through any other system and a licensee cannot
|
||||
impose that choice.
|
||||
|
||||
This section is intended to make thoroughly clear what is believed to
|
||||
be a consequence of the rest of this License.
|
||||
|
||||
8. If the distribution and/or use of the Program is restricted in
|
||||
certain countries either by patents or by copyrighted interfaces, the
|
||||
original copyright holder who places the Program under this License
|
||||
may add an explicit geographical distribution limitation excluding
|
||||
those countries, so that distribution is permitted only in or among
|
||||
countries not thus excluded. In such case, this License incorporates
|
||||
the limitation as if written in the body of this License.
|
||||
|
||||
9. The Free Software Foundation may publish revised and/or new versions
|
||||
of the General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the Program
|
||||
specifies a version number of this License which applies to it and "any
|
||||
later version", you have the option of following the terms and conditions
|
||||
either of that version or of any later version published by the Free
|
||||
Software Foundation. If the Program does not specify a version number of
|
||||
this License, you may choose any version ever published by the Free Software
|
||||
Foundation.
|
||||
|
||||
10. If you wish to incorporate parts of the Program into other free
|
||||
programs whose distribution conditions are different, write to the author
|
||||
to ask for permission. For software which is copyrighted by the Free
|
||||
Software Foundation, write to the Free Software Foundation; we sometimes
|
||||
make exceptions for this. Our decision will be guided by the two goals
|
||||
of preserving the free status of all derivatives of our free software and
|
||||
of promoting the sharing and reuse of software generally.
|
||||
|
||||
NO WARRANTY
|
||||
|
||||
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
|
||||
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
|
||||
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
|
||||
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
|
||||
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
|
||||
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
|
||||
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
|
||||
REPAIR OR CORRECTION.
|
||||
|
||||
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
|
||||
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
|
||||
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
|
||||
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
|
||||
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
|
||||
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
|
||||
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGES.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
|
||||
possible use to the public, the best way to achieve this is to make it
|
||||
free software which everyone can redistribute and change under these terms.
|
||||
|
||||
To do so, attach the following notices to the program. It is safest
|
||||
to attach them to the start of each source file to most effectively
|
||||
convey the exclusion of warranty; and each file should have at least
|
||||
the "copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the program's name and a brief idea of what it does.>
|
||||
Copyright (C) <year> <name of author>
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License along
|
||||
with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
If the program is interactive, make it output a short notice like this
|
||||
when it starts in an interactive mode:
|
||||
|
||||
Gnomovision version 69, Copyright (C) year name of author
|
||||
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
||||
parts of the General Public License. Of course, the commands you use may
|
||||
be called something other than `show w' and `show c'; they could even be
|
||||
mouse-clicks or menu items--whatever suits your program.
|
||||
|
||||
You should also get your employer (if you work as a programmer) or your
|
||||
school, if any, to sign a "copyright disclaimer" for the program, if
|
||||
necessary. Here is a sample; alter the names:
|
||||
|
||||
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
|
||||
`Gnomovision' (which makes passes at compilers) written by James Hacker.
|
||||
|
||||
<signature of Ty Coon>, 1 April 1989
|
||||
Ty Coon, President of Vice
|
||||
|
||||
This General Public License does not permit incorporating your program into
|
||||
proprietary programs. If your program is a subroutine library, you may
|
||||
consider it more useful to permit linking proprietary applications with the
|
||||
library. If this is what you want to do, use the GNU Lesser General
|
||||
Public License instead of this License.
|
@ -6,8 +6,22 @@ Refer to the book for step-by-step documentation.
|
||||
|
||||
<p align="center"><a href="http://haskelldata.com" target="_blank"><img src="http://haskelldata.com/images/ch02.png"/></a></p>
|
||||
|
||||
# How to use
|
||||
# Recipes
|
||||
* **Code01**: Trimming excess whitespace
|
||||
* **Code02**: Ignoring punctuation and specific characters
|
||||
* **Code03**: Coping with unexpected or missing input
|
||||
* **Code04**: Validating records by matching regular expressions
|
||||
* **Code05**: Lexing and parsing an e-mail address
|
||||
* **Code06**: Deduplication of nonconflicting data items
|
||||
* **Code07**: Deduplication of conflicting data items
|
||||
* **Code08**: Implementing a frequency table using Data.List
|
||||
* **Code08**: Implementing a frequency table using Data.MultiSet
|
||||
* **Code10**: Computing the Manhattan distance
|
||||
* **Code11**: Computing the Euclidean distance
|
||||
* **Code12**: Comparing scaled data using the Pearson correlation coefficient
|
||||
* **Code13**: Comparing sparse data using cosine similarity
|
||||
|
||||
# How to use
|
||||
### Setting up the environment
|
||||
Install the [Haskell Platform](http://www.haskell.org/platform/).
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user