Axis (with Monadic Operand) R←f[B]Y

f must be a monadic primitive mixed function taken from those shown in Table 1 below, or a function derived from the operators Reduction (/) or Scan (\). B must be a numeric scalar or vector. Y may be any array whose items are appropriate to function f. Axis does not follow the normal syntax of an operator.

Table 1: Primitive monadic mixed functions with optional axis.

Function	Name	Range of B
⌽ or ⊖	Reverse	B∊⍳⍴⍴Y
↑	Mix	(0≠1|B)^(B>⎕IO-1)^(B<⎕IO+⍴⍴Y)
↓	Split	B∊⍳⍴⍴Y
,	Ravel	fraction, or zero or more axes of Y
⊂	Enclose	(B≡⍳0)∨(^/B∊⍳⍴⍴Y)

In most cases, B must be an integer which identifies a specific axis of Y. However, when f is the Mix function (↑), B is a fractional value whose lower and upper integer bounds select an adjacent pair of axes of Y or an extreme axis of Y.

For Ravel (,) and Enclose (⊂), B can be a vector of two or more axes.

⎕IO is an implicit argument of the derived function which determines the meaning of B.

Examples

      ⌽[1]2 3⍴⍳6
4 5 6
1 2 3

      ↑[.1]'ONE' 'TWO'
OT
NW
EO