| Integers | i: 0 _ _ | Index Of Last |
i: y is the list of integers from -y to y ;
in general, i: a j. b produces the list of numbers
from -a to a in b equal steps
(or in 1+2*a steps if b is 0).
Thus:i: 3 _3 _2 _1 0 1 2 3 i: _2 2 1 0 _1 _2 i: _2.5j4 2.5 1.25 0 _1.25 _2.5 i: 0 0 |
i: is like i. but gives the index of the
last occurrence. Thus:1 2 3 4 1 2 3 i: 1 2 2 3 3 3 4 4 5 4 5 5 6 6 6 3 3 7 1 2 3 4 1 2 3 i. 1 2 2 3 3 3 4 4 5 0 1 1 2 2 2 3 3 7 |
(3 # i.3 4) i: (i.2 4) 2 5 (3 # i.3 4) i. (i.2 4) 0 3 (] #~ i.@# = i.~) 'eleemosynary' first occurrence of each letter elmosynar (] #~ i.@# = i:~) 'eleemosynary' last occurrence of each letter lemosnary (] #~ i.~ = i:~) 'eleemosynary' letters that are unique lmosnar