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 Reverse |.  _ 1 _ Rotate

 |. y reverses the order of the items of y . For example: ``` |. t=: 'abcdefg' gfedcba ``` The right shift is the monad |.!.f , equivalent to the dyad |.!.f with a left argument _1 . For example: ``` |.!.'#' t #abcdef |.!.10 i.3 3 10 10 10 0 1 2 3 4 5 ``` x|.y rotates successive axes of y by successive elements of x . Thus: ``` 1 2 |. i. 3 5 7 8 9 5 6 12 13 14 10 11 2 3 4 0 1 ``` The phrase x |.!.f y produces a shift: the items normally brought around by the cyclic rotation are replaced by the atom f unless f is empty (0=#f), in which case they are replaced by the normal fill defined under Take ({.): ``` 2 _2 |.!.'#'"0 1 t cdefg## ##abcde ```

```   y=: a.{~ (a. i. 'A') + i. 5 6

(] ; 2&|. ; _2&|. ; 2&|."1  ; 2&(|.!.'*'"1)) y
+------+------+------+------+------+
|ABCDEF|MNOPQR|STUVWX|CDEFAB|CDEF**|
|GHIJKL|STUVWX|YZ[\]^|IJKLGH|IJKL**|
|MNOPQR|YZ[\]^|ABCDEF|OPQRMN|OPQR**|
|STUVWX|ABCDEF|GHIJKL|UVWXST|UVWX**|
|YZ[\]^|GHIJKL|MNOPQR|[\]^YZ|[\]^**|
+------+------+------+------+------+

(] ; |. ; |."1 ; |.!.'*'"1  ; (2: |. ])) y
+------+------+------+------+------+
|ABCDEF|YZ[\]^|FEDCBA|*ABCDE|MNOPQR|
|GHIJKL|STUVWX|LKJIHG|*GHIJK|STUVWX|
|MNOPQR|MNOPQR|RQPONM|*MNOPQ|YZ[\]^|
|STUVWX|GHIJKL|XWVUTS|*STUVW|ABCDEF|
|YZ[\]^|ABCDEF|^]\[ZY|*YZ[\]|GHIJKL|
+------+------+------+------+------+

1 _2 |. !. '*' 3{. y
**GHIJ
**MNOP
******

```

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