X and Y may be any arrays. The result R is the right argument Y.
42 ⊢'abc' 1 2 3 abc 1 2 3
32+1.8×⊢0 100 ⍝ {32+1.8÷⍵} 0 100
32 212
(⊢÷+/) 4 3 0 1 ⍝ {⍵÷+/⍵} 4 3 0 1
0.5 0.375 0 0.125
↓⍣2⊢2 2 2 2⍴⎕A ⍝ (↓⍣2)2 2 2 2⍴⎕A
AB CD EF GH
IJ KL MN OP
When ⊢ is applied using reduction, the derived function selects the last sub-array of the array along the specified dimension. This is implemented as an idiom.
⊢/1 2 3 3 mat←↑'scent' 'canoe' 'arson' 'rouse' 'fleet' ⊢⌿mat ⍝ last row fleet ⊢/mat ⍝ last column tenet ⊢/[2]2 3 4⍴⍳24 ⍝ last row from each plane 9 10 11 12 21 22 23 24