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 Rank u"n

 The verb u"n applies u to each cell as specified by the rank n . The full form of the rank used is 3\$&.|.n . For example, if n=:2 , the three ranks are 2 2 2 , and if n=: 2 3, they are 3 2 3 . A negative rank is complementary: u"(-r) y is equivalent to u"(0>.(#\$y)-r)"_ y . See also Section II.A Nouns and Section II.B Verbs.
```   (] ; , ; ,"2) y=: a. {~ (a.i.'A') + i. 2 3 4
+----+------------------------+------------+
|ABCD|ABCDEFGHIJKLMNOPQRSTUVWX|ABCDEFGHIJKL|
|EFGH|                        |MNOPQRSTUVWX|
|IJKL|                        |            |
|    |                        |            |
|MNOP|                        |            |
|QRST|                        |            |
|UVWX|                        |            |
+----+------------------------+------------+

(<"0 ; <"1 ; <"2 ; <"3 ,&< <"_1) y     NB. Boxing of ranks 0 1 2 3 _1
+---------+----------------+-----------+------+-----------+
|+-+-+-+-+|+----+----+----+|+----+----+|+----+|+----+----+|
||A|B|C|D|||ABCD|EFGH|IJKL|||ABCD|MNOP|||ABCD|||ABCD|MNOP||
|+-+-+-+-+|+----+----+----+||EFGH|QRST|||EFGH|||EFGH|QRST||
||E|F|G|H|||MNOP|QRST|UVWX|||IJKL|UVWX|||IJKL|||IJKL|UVWX||
|+-+-+-+-+|+----+----+----+|+----+----+||    ||+----+----+|
||I|J|K|L||                |           ||MNOP||           |
|+-+-+-+-+|                |           ||QRST||           |
|         |                |           ||UVWX||           |
|+-+-+-+-+|                |           |+----+|           |
||M|N|O|P||                |           |      |           |
|+-+-+-+-+|                |           |      |           |
||Q|R|S|T||                |           |      |           |
|+-+-+-+-+|                |           |      |           |
||U|V|W|X||                |           |      |           |
|+-+-+-+-+|                |           |      |           |
+---------+----------------+-----------+------+-----------+

('*#' ,"0 1 ' abcde') ; (+/"2 i. 2 3 4) ; (+/"_1 i. 2 3 4)
+-------+-----------+-----------+
|* abcde|12 15 18 21|12 15 18 21|
|# abcde|48 51 54 57|48 51 54 57|
+-------+-----------+-----------+

```

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