diff options
| author | Camil Staps | 2016-02-02 19:24:50 +0100 |
|---|---|---|
| committer | Camil Staps | 2016-02-02 19:24:50 +0100 |
| commit | a7d7542dc646a5fd124ef71e71ce260889f1701b (patch) | |
| tree | 04ed89503bbb3cc9933273a1326a53ca724c3492 /1415/fp2/week1/mart/RandomGetallen.icl | |
| parent | week6 camil: working positioning of lines by putting empties at left and righ... (diff) | |
Diffstat (limited to '1415/fp2/week1/mart/RandomGetallen.icl')
| -rw-r--r-- | 1415/fp2/week1/mart/RandomGetallen.icl | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/1415/fp2/week1/mart/RandomGetallen.icl b/1415/fp2/week1/mart/RandomGetallen.icl new file mode 100644 index 0000000..b756c91 --- /dev/null +++ b/1415/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)]
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