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f may be any dyadic function. X and Y may be any arrays whose items are appropriate to function f.

The derived function is equivalent to YfX. The derived function need not return a result.

If left argument X is omitted, the right argument Y is duplicated in its place, i.e.

f⍨Y ←→ Y f⍨Y

#### Examples

N
3 2 5 4 6 1 3
N/⍨2|N
3 5 1 3
⍴⍨3
3 3 3
mean←+/∘(÷∘⍴⍨) ⍝ mean of a vector
mean ⍳10
5.5

The following statements are equivalent:

F/⍨←I
F←F/⍨I
F←I/F

Commute often eliminates the need for parentheses

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