src/HOL/ex/IArray_Examples.thy
author haftmann
Wed Feb 13 13:38:52 2013 +0100 (2013-02-13)
changeset 51094 84b03c49c223
parent 50138 ca989d793b34
child 51143 0a2371e7ced3
permissions -rw-r--r--
IArray ignorant of particular representation of nat
     1 theory IArray_Examples
     2 imports "~~/src/HOL/Library/IArray" "~~/src/HOL/Library/Efficient_Nat"
     3 begin
     4 
     5 lemma "IArray [True,False] !! 1 = False"
     6 by eval
     7 
     8 lemma "IArray.length (IArray [[],[]]) = 2"
     9 by eval
    10 
    11 lemma "IArray.list_of (IArray [1,3::int]) = [1,3]"
    12 by eval
    13 
    14 lemma "IArray.list_of (IArray.of_fun (%n. n*n) 5) = [0,1,4,9,16]"
    15 by eval
    16 
    17 fun sum2 :: "'a::monoid_add iarray \<Rightarrow> nat \<Rightarrow> 'a \<Rightarrow> 'a" where
    18 "sum2 A n s = (if n=0 then s else sum2 A (n - 1) (s + A!!(n - 1)))"
    19 
    20 definition sum :: "'a::monoid_add iarray \<Rightarrow> 'a" where
    21 "sum A = sum2 A (IArray.length A) 0"
    22 
    23 lemma "sum (IArray [1,2,3,4,5,6,7,8,9::int]) = 45"
    24 by eval
    25 
    26 end
    27