Added Chapter 7

Ch07/Code01_avg/Code0701.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0601.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0701
+version:             0.1.0.0
+synopsis:            Moving average.
+-- 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 Code0701
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code01_avg/Main.hs

@@ -0,0 +1,22 @@
+-- Computing the moving average
+main = do
+  rawInput <- readFile "input.txt"
+  let input = clean rawInput
+  print input
+  putStrLn $  "mean is " ++ (show.mean) input
+  putStrLn $  "moving average is " ++ (show.avg) input
+  
+clean :: String -> [Double]
+clean raw = map (\s -> read s :: Double) (lines raw)
+
+avg :: [Double] -> Double
+avg (x:xs) = a*x + (1-a)*(avg xs)
+  where a = 0.95
+avg [] = 0
+
+mean :: Fractional a => [a] -> a
+mean xs = (sum xs) / (fromIntegral (length xs))
+
+-- [4.0,3.0,2.0,5.0,3.0,4.0,1.0,3.0,12.0,3.0]
+-- mean is 4.0
+-- moving average is 3.9478627675211913

Ch07/Code01_avg/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0701 *~ 

Ch07/Code01_avg/input.txt

@@ -0,0 +1,10 @@
+4
+3
+2
+5
+3
+4
+1
+3
+12
+3

Ch07/Code02_med/Code0702.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0602.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0702
+version:             0.1.0.0
+synopsis:            Moving median.
+-- 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 Code0702
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, heap >=1.0 && <1.1
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code02_med/Main.hs

@@ -0,0 +1,34 @@
+import Data.Heap
+import Data.Maybe (fromJust)
+
+-- Computing the moving median
+main = do
+  rawInput <- readFile "input.txt"
+  let input = clean rawInput
+  print $ input
+  print $ median input (empty :: MaxHeap Int) (empty :: MinHeap Int)
+  
+clean :: String -> [Int]
+clean raw = map (\s -> read s :: Int) (lines raw)
+
+median (x:xs) maxheap minheap = case viewHead maxheap of
+  Just theMax -> if x < theMax
+            then median xs (insert x maxheap) minheap
+            else median xs maxheap (insert x minheap)
+  Nothing -> median xs (insert x maxheap) minheap
+
+median [] maxheap minheap
+  | size maxheap + 1 < size minheap = 
+    median [] (insert minelem maxheap) $ 
+              (snd.fromJust.view) minheap
+  | size minheap + 1 < size maxheap = 
+      median [] ((snd.fromJust.view) maxheap) $ 
+                insert maxelem minheap
+  | size maxheap == size minheap = 
+      (fromIntegral maxelem + fromIntegral minelem)/2.0
+  | size maxheap > size minheap = fromIntegral maxelem
+  | otherwise = fromIntegral minelem
+  where maxelem = fromJust (viewHead maxheap)
+        minelem = fromJust (viewHead minheap)
+
+

Ch07/Code02_med/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0702 *~ 

Ch07/Code02_med/input.txt

@@ -0,0 +1,10 @@
+3
+4
+2
+5
+6
+4
+2
+6
+4
+1

Ch07/Code03_lin/Code0703.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0603.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0703
+version:             0.1.0.0
+synopsis:            Linear regression.
+-- 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 Code0703
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, statistics-linreg >=0.2 && <0.3, vector >=0.10 && <0.11
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code03_lin/Main.hs

@@ -0,0 +1,9 @@
+import Statistics.LinearRegression
+import qualified Data.Vector.Unboxed as U
+
+-- Computing a linear regression
+main = do
+  let xs = U.fromList [1.0, 2.0, 3.0, 4.0, 5.0] :: U.Vector Double
+  let ys = U.fromList [1.0, 2.0, 1.3, 3.75, 2.25] :: U.Vector Double
+  let (b, m) = linearRegression xs ys
+  print $ concat ["y = ", show m, " x + ", show b]

Ch07/Code03_lin/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0703 *~ 

Ch07/Code04_quad/Code0704.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0604.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0704
+version:             0.1.0.0
+synopsis:            Quadratic regression.
+-- 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 Code0704
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, array >=0.4 && <0.5, dsp >=0.2 && <0.3
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code04_quad/Main.hs

@@ -0,0 +1,13 @@
+import Data.Array (listArray, elems)
+import Matrix.LU (solve)
+
+-- Computing the quadratic regression 
+fit d vals = elems $ solve mat vec  where
+   mat = listArray ((1,1), (d,d)) $ matrixArray
+   vec = listArray (1,d) $ take d vals
+   matrixArray = concat [polys x d | x <- [0..fromIntegral (d-1)]]
+   polys x d = map (x**) [0..fromIntegral (d-1)]
+
+main = print $ fit 3 [1,6,17,34,57,86,121,162,209,262,321]
+
+equation coeffs = zip coeffs (reverse [1..length coeffs])

Ch07/Code04_quad/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0704 *~ 

Ch07/Code05_cov/Code0705.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0605.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0705
+version:             0.1.0.0
+synopsis:            Covariance matrix.
+-- 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 Code0705
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, hstats
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code05_cov/Main.hs

@@ -0,0 +1,8 @@
+import Math.Statistics
+
+-- Computing the covariance matrix
+main = do print $ covMatrix matrixArray
+  where matrixArray = [ [1,1,0,0]
+                      , [0,1,0,1]
+                      , [1,1,0,1] ]
+

Ch07/Code05_cov/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0705 *~ 

Ch07/Code06_pair/Code0706.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0606.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0706
+version:             0.1.0.0
+synopsis:            Pairwise tuples.
+-- 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 Code0706
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code06_pair/Main.hs

@@ -0,0 +1,7 @@
+import Data.List (tails, nub, sort)
+
+-- Finding all pairs in a list
+main = do
+  print $ pairs [1,2,3,4]
+
+pairs xs = [(x, y) | (x:ys) <- tails (nub xs), y <- ys]

Ch07/Code06_pair/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0706 *~ 

Ch07/Code07_pear/Code0707.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0607.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0707
+version:             0.1.0.0
+synopsis:            Pearson 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 Code0707
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, hstats >=0.3 && <0.4, csv >=0.1 && <0.2
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code07_pear/Main.hs

@@ -0,0 +1,21 @@
+import Math.Statistics (pearson)
+import Text.CSV
+import Data.List (tails, nub)
+
+-- Computing the pearson coefficient to detect similarities
+main = do
+  let fileName = "ratings.csv"
+  input <- readFile fileName
+  let csv = parseCSV fileName input
+  print $ calcSimilarities csv
+
+calcSimilarities :: Either e [Record] -> (Double, ([String],[String]))
+calcSimilarities (Left err) = error "error parsing"
+calcSimilarities (Right csv) = maximum $ zip 
+  [ pearson (convertList a) (convertList b) 
+  | (a,b) <- csvPairs] $ csvPairs
+  where csvPairs = pairs $ filter (/= [""]) csv
+convertList :: [String] -> [Double]
+convertList = map read
+
+pairs xs = [(x, y) | (x:ys) <- tails (nub xs), y <- ys]

Ch07/Code07_pear/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0707 *~ 

Ch07/Code07_pear/ratings.csv

@@ -0,0 +1,3 @@
+4,5,4,4,3
+2,5,4,3,1
+5,5,5,5,5

Ch07/Code08_net/Code0708.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0608.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0708
+version:             0.1.0.0
+synopsis:            Bayesian network.
+-- 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 Code0708
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, probability >=0.2 && <0.3
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code08_net/Main.hs

@@ -0,0 +1,47 @@
+import qualified Numeric.Probability.Distribution as Dist
+import Numeric.Probability.Distribution ((??), (?=<<), )
+
+prob p = Dist.choose p True False
+
+-- P (A) "formatting error"
+a :: Dist.T Rational Bool
+a = prob 0.2
+
+-- P (B) "semantic error"
+b :: Dist.T Rational Bool
+b = prob 0.05
+
+-- P (C | AB) "runs"
+c :: Bool -> Bool -> Dist.T Rational Bool
+c False False = prob 0.9
+c False True = prob 0.5
+c True False = prob 0.3
+c True True = prob 0.1
+
+-- P (D | C) "passes test cases"
+d :: Bool -> Dist.T Rational Bool
+d False = prob 0.1
+d True = prob 0.4
+
+-- P (E | C) "well written"
+e :: Bool -> Dist.T Rational Bool
+e False = prob 0.5
+e True = prob 0.2
+
+data Network = N { aVal :: Bool
+                 , bVal :: Bool
+                 , cVal :: Bool
+                 , dVal :: Bool
+                 , eVal :: Bool }
+             deriving (Eq, Ord, Show) -- need all?
+                      
+bNetwork :: Dist.T Rational Network                      
+bNetwork = do a' <- a
+              b' <- b
+              c' <- c a' b'
+              d' <- d c'
+              e' <- e c'
+              return (N a' b' c' d' e')
+
+-- Using Baysian networks to compute probabilities
+main = print $ eVal ?? dVal ?=<< bNetwork

Ch07/Code08_net/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0708 *~ 

Ch07/Code09_cards/Code0709.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0609.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0709
+version:             0.1.0.0
+synopsis:            Playing cards.
+-- 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 Code0709
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, probability >=0.2 && <0.3, transformers >=0.3 && <0.4
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code09_cards/Main.hs

@@ -0,0 +1,48 @@
+import qualified Numeric.Probability.Distribution as Dist
+import Numeric.Probability.Distribution ((??))
+import Control.Monad.Trans.State (StateT(StateT, runStateT), evalStateT)
+import Control.Monad (replicateM)
+import Data.List (delete)
+
+data Suit = Club | Spade | Heart | Diamond
+          deriving (Eq,Ord,Show,Enum)
+
+data Rank = Plain Int | Jack | Queen | King | Ace
+          deriving (Eq,Ord,Show)
+
+type Card = (Rank,Suit)
+
+plains :: [Rank]
+plains = map Plain [2..10]
+
+faces :: [Rank]
+faces = [Jack,Queen,King,Ace]
+
+isFace :: Card -> Bool
+isFace (r,_) = r `elem` faces
+
+isPlain :: Card -> Bool
+isPlain (r,_) = r `elem` plains
+
+ranks :: [Rank]
+ranks = plains ++ faces
+
+suits :: [Suit]
+suits = [Club, Spade, Heart, Diamond]
+
+deck :: [Card]
+deck = [ (r,s) | r <- ranks, s <- suits ]
+
+selectOne :: (Fractional prob, Eq a) =>
+   StateT ([a]) (Dist.T prob) a
+selectOne =
+   StateT $ Dist.uniform . removeEach
+
+select :: (Fractional prob, Eq a) => Int -> [a] -> Dist.T prob [a]
+select n = evalStateT (replicateM n selectOne)
+
+removeEach xs = zip xs (map (flip delete xs) xs)
+
+-- Finding probabilities in playing cards
+main = do
+  print $ Dist.just [(Plain 3, Heart), (Plain 3, Diamond)] ?? select 2 deck

Ch07/Code09_cards/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0709 *~ 

Ch07/Code10_markov/Code0710.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0610.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0710
+version:             0.1.0.0
+synopsis:            Markov chain.
+-- 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 Code0710
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, markov-chain >=0.0 && <0.1, random >=1.0 && <1.1
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code10_markov/Main.hs

@@ -0,0 +1,11 @@
+import Data.MarkovChain
+import System.Random (mkStdGen)
+
+-- Using a Markov chain
+main = do
+  rawText <- readFile "big.txt"
+  let g = mkStdGen 100
+  putStrLn $ "Generated character by character: \n"
+  putStrLn $ take 100 $ run 3 rawText 0 g
+  putStrLn $ "\nGenerated word by word: \n"
+  putStrLn $ unwords $ take 100 $ run 2 (words rawText) 0 g

Ch07/Code10_markov/Makefile

@@ -0,0 +1,6 @@
+default:
+	wget -N norvig.com/big.txt
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0710 big.txt *~ 

Ch07/Code11_ngram/Code0711.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0611.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0711
+version:             0.1.0.0
+synopsis:            Constructing an n-gram.
+-- 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 Code0711
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code11_ngram/Main.hs

@@ -0,0 +1,7 @@
+main = print $ ngram 3 "hello world"
+
+-- Creating all n-grams of a list
+ngram :: Int -> [a] -> [[a]]
+ngram n xs 
+  | n <= length xs = take n xs : ngram n (drop 1 xs)
+  | otherwise = []

Ch07/Code11_ngram/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0711 *~ 

Ch07/Code12_NN/Code0712.cabal

@@ -0,0 +1,25 @@
+-- Initial Code0612.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                Code0712
+version:             0.1.0.0
+synopsis:            Neural networks.
+-- 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 Code0712
+  main-is:             Main.hs
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <4.7, random >=1.0 && <1.1
+  -- hs-source-dirs:      
+  default-language:    Haskell2010

Ch07/Code12_NN/Main.hs

@@ -0,0 +1,55 @@
+import Control.Monad (replicateM)
+import System.Random (randomR, getStdRandom)
+
+type Inputs = [Float]
+type Weights = [Float]
+type Threshold = Float
+type Output = Float
+type Expected = Float
+type Actual = Float
+type Delta = Float
+type Interval = Int
+type Step = (Weights, Interval)
+
+output :: Inputs -> Weights -> Threshold -> Output
+output xs ws t 
+  | (dot xs ws) > t = 1
+  | otherwise = 0
+  where dot as bs = sum $ zipWith (*) as bs
+        
+adjustWeights :: Inputs -> Weights -> Expected -> Actual -> Weights
+adjustWeights xs ws ex ac = add ws delta
+  where delta = map (err * learningRate *) xs
+        add = zipWith (+)
+        err = ex - ac
+        learningRate = 0.1
+
+step :: Inputs -> Weights -> Expected -> Weights
+step xs ws ex = adjustWeights xs ws ex (output xs ws t)
+  where t = 0.2
+        
+epoch :: [(Inputs, Expected)] -> Weights -> (Weights, Delta)
+epoch inputs ws = (newWeights, delta)
+  where newWeights = foldl (\acc (xs, ex) -> step xs acc ex) ws inputs
+        delta = (sum (absSub newWeights ws)) / length' ws
+        absSub as bs = map abs $ zipWith (-) as bs
+        length' = fromIntegral . length
+
+run :: [(Inputs, Expected)] -> Weights -> Interval -> Step
+run inputs ws n
+  | delta == 0.0 = (newWeights, n)
+  | otherwise = run inputs newWeights (n+1)
+  where (newWeights, delta) = epoch inputs ws
+
+
+initialWeights :: Int -> IO [Float]
+initialWeights nb = do
+  let interval = randomR (-0.5,0.5)
+  (replicateM nb (getStdRandom interval))        
+
+-- Classifying points using a neural network
+main :: IO ()
+main = do
+  w <- initialWeights 2
+  let (ws,i) = run [([0,0],0),([0,1],0),([1,0],0),([1,1],1)] w 1
+  print (ws,i)

Ch07/Code12_NN/Makefile

@@ -0,0 +1,5 @@
+default:
+	cabal install --bindir=./
+
+clean:
+	rm -rf dist Setup.hs Code0712 *~ 

Ch07/LICENSE

@@ -0,0 +1,339 @@
+             GNU GENERAL PUBLIC LICENSE
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+
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Ch07/README.md

@@ -6,8 +6,21 @@ Refer to the book for step-by-step explanations.
 
 <p align="center"><a href="http://haskelldata.com" target="_blank"><img src="http://haskelldata.com/images/ch07.png"/></a></p>
 
-# How to use
+# Recipes:
+* **Code01**: Calculating a moving average
+* **Code02**: Calculating a moving median
+* **Code03**: Approximating a linear regression
+* **Code04**: Approximating a quadratic regression
+* **Code05**: Obtaining the covariance matrix from samples
+* **Code06**: Finding all unique pairings in a list
+* **Code07**: Using the Pearson correlation coefficient
+* **Code08**: Evaluating a Bayesian network
+* **Code09**: Creating a data structure for playing cards
+* **Code10**: Using a Markov chain to generate text
+* **Code11**: Creating n-grams from a list
+* **Code12**: Constructing a neural network perception
 
+# How to use
 ### Setting up the environment
 Install the [Haskell Platform](http://www.haskell.org/platform/).