diff options
| author | Mart Lubbers | 2015-04-21 14:25:25 +0200 |
|---|---|---|
| committer | Mart Lubbers | 2015-04-21 14:25:25 +0200 |
| commit | 892075a5f701177235c0296c28899563836b42e2 (patch) | |
| tree | 0790b9518f7aac9bfe732ce030b4f467f5045229 /fp2/week1/mart/RandomGetallen.icl | |
| parent | Added s-numbers (diff) | |
rare zooi
Diffstat (limited to 'fp2/week1/mart/RandomGetallen.icl')
| -rw-r--r-- | fp2/week1/mart/RandomGetallen.icl | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/fp2/week1/mart/RandomGetallen.icl b/fp2/week1/mart/RandomGetallen.icl new file mode 100644 index 0000000..b756c91 --- /dev/null +++ b/fp2/week1/mart/RandomGetallen.icl @@ -0,0 +1,33 @@ +implementation module RandomGetallen
+
+import StdEnv, Random
+
+//Start :: *World -> ([Int],*World)
+//Start world
+//# (rs,world) = getNewRandomSeed world
+//= (shuffle [1..10] rs,world)
+
+
+Start = shuffle [1..10] nullRandomSeed
+
+random_n :: Int RandomSeed -> ([Int],RandomSeed)
+random_n n seed = seqList (repeatn n random) seed
+
+random_inf :: RandomSeed -> [Int]
+random_inf seed = iterateSt random seed
+
+iterateSt :: (s -> (a,s)) s -> [a]
+iterateSt f s = [a : iterateSt f s`]
+where
+ (a,s`) = f s
+
+shuffle :: [a] RandomSeed -> [a]
+shuffle xs seed = (perms xs) !! ((fst (random seed)) rem (fac (length xs)))
+
+fac :: Int -> Int
+fac 0 = 1
+fac n = n * fac (n-1)
+
+perms :: [a] -> [[a]]
+perms [] = [[]]
+perms xs = [[xs!!i : xs`] \\ i <- [0..length xs - 1] , xs` <- perms (take i xs ++ drop (i+1) xs)]
|