10 20 30 ∘.- 1 2 4 8
9 8 6 2
19 18 16 12
29 28 26 22
|
1 2 4 8 ∘.- 10 20 30
¯9 ¯19 ¯29
¯8 ¯18 ¯28
¯6 ¯16 ¯26
¯2 ¯12 ¯22
|
Swapping sides exchanges the arguments in each function application, and also changes the order in which results are presented.
⍉ 1 2 4 8 ∘.(-⍨) 10 20 30
9 8 6 2
19 18 16 12
29 28 26 22
The Swap (⍨) operator and Transpose (⍉) function undo this.
For any function f, the outer product x ∘.f y is equivalent to ⍉ y ∘.(f⍨) x.