Simple Numeric Indexing

Commentary Code Result
Commentary (10 20 30)[4 3 2 1 0] Nil 30 20 10 Nil
Commentary 10 20 30=>n;
n[0 0.1 1 1.1 2 2.1 3 3.1 4 4.1]		 Nil Nil 10 10 20 20 30 30 Nil Nil
Commentary 3` 1 2 3
Commentary (7`)[4` +2] 3 4 5 6
Commentary 7` =>n $ ;
n[4..2 5..8] $;		 1 2 3 4 5 6 7
4 3 2 5 6 7 Nil
Commentary 7` => n; 44 33 99=>[4 3 9 2]n; n 1 99 33 44 5 6 7
Commentary 7` => n; 44 33 99 *-> 4 =>[4 3 9 2]n; n 1 99 44 44 5 6 7
Commentary 7` => n;n[(n *>=2)&(n *<6) $ ] 0111100
Result:
2 3 4 5
Commentary 1 2 3["11101"] 1 2 3 Nil
Commentary 1 2 3[] 1 2 3