Delta Stile (⍋)

⍋ 𝕩: Grade Up

Indices of 𝕩 that would sort its major cells in ascending order.

       a ← 3‿2‿1

       ⍋ a
⟨ 2 1 0 ⟩

       (⍋a) ⊏ a
⟨ 1 2 3 ⟩

𝕨 ⍋ 𝕩: Bins Up

Binary search for each element of 𝕩 in 𝕨, and return the index found, if any.

𝕨 must be sorted in ascending order.

       3‿4‿5‿7 ⍋ 2
┌·   
· 0  
    ┘

       3‿4‿5‿7 ⍋ 2‿6
⟨ 0 3 ⟩