| Integers | i. 1 _ _ | Index Of |
The shape of i.y is |y , and its atoms
are the first */|y non-negative integers.
A negative element in y causes reversal of the atoms
along the corresponding axis. For example:i. 5 0 1 2 3 4 i. 2 _5 4 3 2 1 0 9 8 7 6 5 |
If rix is the rank of an item of x,
then the shape of the result of x i. y
is (-rix)}.$y . Each atom of the result is
either #x or the index of the first occurrence
among the items of x of the corresponding rix-cell
of y . The comparison in x i. y is tolerant, and fit can be used to specify the tolerance, as in i. !. t . |
(i.4);(i._4);(i.2 3 4);(i.2 _3 4);(i.'')
+-------+-------+-----------+-----------+-+
|0 1 2 3|3 2 1 0| 0 1 2 3| 8 9 10 11|0|
| | | 4 5 6 7| 4 5 6 7| |
| | | 8 9 10 11| 0 1 2 3| |
| | | | | |
| | |12 13 14 15|20 21 22 23| |
| | |16 17 18 19|16 17 18 19| |
| | |20 21 22 23|12 13 14 15| |
+-------+-------+-----------+-----------+-+
A=: 'abcdefghijklmnopqrstuvwxyz'
(A i. 'Now');(A i. 'now');(A {~ A i. 'now')
+--------+--------+---+
|26 14 22|13 14 22|now|
+--------+--------+---+
m=: 5 4 $ 12{. A
m;(m i. 'efgh');(1{m);(4{m)
+----+-+----+----+
|abcd|1|efgh|efgh|
|efgh| | | |
|ijkl| | | |
|abcd| | | |
|efgh| | | |
+----+-+----+----+