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Jot Diaeresis is a Dyadic operator with an ambivalent left operand

Operator Jot Diaeresis means

Atop

      -⍤÷ 4
¯0.25
      12 -⍤÷ 4
¯3
      3 1 4 1 5 ~⍤∊ 1 2 3
0 0 1 0 1
      3 1 4 1 5 (~⍤∊ ⊢⍤/ ⊣) ⍳3  ⍝ ⊢⍤/ is always a function
4 5

Rank

      cube    ⍝ 3D array
 1  2  3
 4  5  6
        
 7  8  9
10 11 12

      (,⍤2) cube
1 2 3  4  5  6
7 8 9 10 11 12

      cmat    ⍝ character matrix
abc
zxy 
      (⍋⍤1) cmat    ⍝ grade-up by row  
1 2 3 
2 3 1 
      nmat     ⍝ numeric matrix
1  2  3  4
5  6  7  8
9 10 11 12
 
      10 20 30 (+⍤0 1) nmat  ⍝ scalars plus vectors
11 12 13 14 
25 26 27 28 
39 40 41 42

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