Y may be any array.  The axis specification is optional.  If present, K must be an integer scalar or one-element vector.  The value of K must be an axis of Y.  If absent, the last axis is implied.  The form R←⊖Y implies the first axis.

R is the array Y reversed on the Kth or implied axis.

Examples

      ⌽1 2 3 4 5
5 4 3 2 1
 
      M
1 2 3
4 5 6
      ⌽M
3 2 1
6 5 4
      ⊖M
4 5 6
1 2 3
      ⌽[1]M
4 5 6
1 2 3