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Author: qqin99

Diff for: mp1a-recursion/README.md

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+import Distribution.Simple
+main = defaultMain

Diff for: mp1a-recursion/Setup.hs

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+name:                recursion
+version:             0.1.0.0
+license:             NCSA
+author:              "Nick Walker"
+maintainer:          "[email protected]"
+copyright:           "2019 Nick Walker"
+
+extra-source-files:
+- README.md
+
+description:         Please see the README
+
+dependencies:
+- base >= 4.7 && < 5
+
+library:
+  source-dirs: src
+
+tests:
+  recursion-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - recursion
+    - QuickCheck
+    - test-framework
+    - test-framework-quickcheck2

Diff for: mp1a-recursion/package.yaml

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+cabal-version: 2.2
+
+-- This file has been generated from package.yaml by hpack version 0.34.4.
+--
+-- see: https://github.com/sol/hpack
+
+name:           recursion
+version:        0.1.0.0
+description:    Please see the README
+author:         Nick Walker
+maintainer:     [email protected]
+copyright:      2019 Nick Walker
+license:        NCSA
+build-type:     Simple
+extra-source-files:
+    README.md
+
+library
+  exposed-modules:
+      Lib
+  other-modules:
+      Paths_recursion
+  hs-source-dirs:
+      src
+  build-depends:
+      base >=4.7 && <5
+  default-language: Haskell2010
+
+test-suite recursion-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_recursion
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      QuickCheck
+    , base >=4.7 && <5
+    , recursion
+    , test-framework
+    , test-framework-quickcheck2
+  default-language: Haskell2010

Diff for: mp1a-recursion/recursion.cabal

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+--- Getting Started
+--- ===============
+
+--- Relevant Files
+--- --------------
+
+module Lib where
+
+-- This line imports the Prelude module without certain functions
+import Prelude hiding ( take, drop, reverse
+                      , zip, zipWith
+                      , map, foldl, foldr
+                      , iterate, repeat
+                      , replicate, cycle
+                      , (++)
+                      )
+-- When you are allowed to use builtin functions Prepend them with "P."
+-- for example `P.take`
+import qualified Prelude as P
+
+--- Problems
+--- ========
+
+--- Recursion
+--- ---------
+
+--- ### mytake
+
+-- don't forget to put the type declaration or you will lose points!
+mytake :: (Num a1, Ord a1) => a1 -> [a2] -> [a2]
+
+mytake 0 _                  = []
+mytake n []                 = []
+mytake n (x:xs) | n>0 = x : mytake (n-1) xs
+                | n<0 = []
+
+--- ### mydrop
+
+-- don't forget to put the type declaration or you will lose points!
+mydrop :: Int -> [a] -> [a]
+mydrop 0 (x:xs) = (x:xs)
+mydrop n [] = []
+mydrop n (x:xs) | n>0 = mydrop (n-1) xs
+                | n<0 = (x:xs)
+
+--- ### rev
+
+-- don't forget to put the type declaration or you will lose points!
+rev :: [a] -> [a]
+rev []=[]
+rev (x:xs) = aux (x:xs) []
+    where aux [] a =a
+          aux (x:xs) a = aux xs (x:a)
+
+--- ### app
+
+-- don't forget to put the type declaration or you will lose points!
+app :: [a] -> [a] -> [a]
+app [] y = y
+app x [] = x
+app (x:xs) y = x: app xs y 
+
+--- ### inclist
+
+-- don't forget to put the type declaration or you will lose points!
+inclist :: Num a => [a] -> [a]
+inclist []= []
+inclist (x:xs)= x+1: inclist xs
+
+--- ### sumlist
+
+-- don't forget to put the type declaration or you will lose points!
+sumlist :: Num a => [a] -> a 
+sumlist []=0
+sumlist (x:xs) =x+ sumlist (xs)
+
+--- ### myzip
+
+-- don't forget to put the type declaration or you will lose points!
+myzip :: [a] -> [b] -> [(a,b)] 
+myzip _ [] = []
+myzip [] _ = []
+myzip (x:xs) (y:ys) =(x,y) : myzip xs ys
+
+--- ### addpairs
+
+-- don't forget to put the type declaration or you will lose points!
+addpairs :: (Num a) => [a] -> [a] -> [a]
+addpairs _ [] = []
+addpairs [] _ = []
+addpairs  x y = [ x+y| (x,y) <-myzip x y] 
+
+--- ### ones
+
+-- don't forget to put the type declaration or you will lose points!
+ones :: [Integer] 
+ones = [1,1..]
+
+--- ### nats
+
+-- don't forget to put the type declaration or you will lose points!
+nats :: [Integer]
+nats=[0,1..]
+
+--- ### fib
+
+-- don't forget to put the type declaration or you will lose points!
+fib :: [Integer] 
+fib = 0:1: addpairs fib (tail fib)
+--- Set Theory
+--- ----------
+
+--- ### add
+
+-- don't forget to put the type declaration or you will lose points! F
+add :: Ord a => a -> [a] -> [a]
+add a [] =[a]
+add a x = quicksort (a:x)
+    where quicksort []= []
+          quicksort(x:xs) =     
+              let smallerSorted = quicksort [a | a <- xs, a <x]  
+                  biggerSorted = quicksort [a | a <- xs, a > x] 
+              in  smallerSorted P.++ [x] P.++ biggerSorted 
+
+--- ### union
+
+-- don't forget to put the type declaration or you will lose points! F
+union xs [] = xs
+union [] ys = ys
+union (x:xs) (y:ys) | x==y = union xs (y:ys)
+                    | x < y  = x:union xs (y:ys)
+                    | x > y = y:union (x:xs) ys
+
+--- ### intersect
+
+-- don't forget to put the type declaration or you will lose points! 
+keepdups :: Ord a =>[a] -> [a]
+keepdups l = [d|(z,d)<- P.zip [0..] l, elem d $ P.take z l]
+intersect :: Ord a => [a] -> [a] -> [a]
+intersect l1 l2 = let l = l1 P.++ l2 in keepdups l
+
+--- ### powerset
+
+-- don't forget to put the type declaration or you will lose points! F
+map' :: (a -> b) -> [a] -> [b]  
+map' _ [] = []  
+map' f (x:xs) = f x : map' f xs 
+
+powerset :: Ord a => [a] -> [[a]]
+powerset [] = [[]]
+powerset (x:xs) = union xss (map' (x:) xss)
+    where xss = powerset xs
+
+--- Higher Order Functions
+--- ----------------------
+
+--- ### inclist'
+
+-- don't forget to put the type declaration or you will lose points! F
+inclist' :: Num a => [a] -> [a]
+inclist'  l = P.map (+1) l
+
+--- ### sumlist'
+
+-- don't forget to put the type declaration or you will lose points!
+sumlist' :: (Num a) => [a] -> a 
+sumlist' xs = P.foldl (\acc x -> acc + x) 0 xs 
+
+any :: (a -> Bool) -> [a] -> Bool
+any p [] = False
+any p (x:xs) = if (p x) then True else any p xs
+
+-----is it a tail recursion?
+all' p [] = True
+all' p (x:xs) | p x       = all' p xs  -----p x == True
+              | otherwise = False
+
+all2 p xx = aux p xx True
+  where aux p [] a =a
+        aux p (x:xs) a = aux p xs (a==p x)   
+
+report a = a
+nth 0 (x:xs) = x
+nth n (x:xs) = nth (n-1) xs
+---kmultlist :: (Ord t, Num t, Show t) => [t] -> (t -> t) -> t
+kmultlist xx k =  aux xx [k]
+    where aux [] klist =trace "Base case." $ (head klist) 1
+          aux (0:xs) _ = trace "Skip case."$ k 0
+          aux (x:xs) klist | trace ("where we are:" ++ show x) $ x < 0 =  (nth (0-x) klist) 1
+                           | trace ("Recursion case." ++ show (x,xs)) otherwise = aux xs ( (\v -> (head klist) (v * x)) : klist)
+
+-----kmultlist [2, 3, 4, 5, 6, -2, 0, 2, 4, 6] report

Diff for: mp1a-recursion/src/Lib.hs

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-17.1
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-17.9
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.8"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor
+extra-deps:
+   - regex-posix-clib-2.7
+
+flags:
+   regex-posix:
+      _regex-posix-clib: true

Diff for: mp1a-recursion/stack.yaml

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages:
+- completed:
+    hackage: regex-posix-clib-2.7@sha256:998fca06da3d719818f0691ef0b8b9b7375afeea228cb08bd9e2db53f96b0cd7,1232
+    pantry-tree:
+      size: 524
+      sha256: 5bf20952472d930323766d250f5fbbe3fe6f2cd3d931e5cf7b62a238ab2099ff
+  original:
+    hackage: regex-posix-clib-2.7
+snapshots:
+- completed:
+    size: 567037
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/17/9.yaml
+    sha256: d7d8d5106e53d1669964bd8bd2b0f88a5ad192d772f5376384b76738fd992311
+  original: lts-17.9