Epsilon Underbar (⍷)

⍷ 𝕩: Deduplicate

Unique major cells of 𝕩.

       ⍷ 4‿5‿6‿6‿4‿7‿5
⟨ 4 5 6 7 ⟩

       a ← 3‿3 ⥊ ↕6

       ⍷ a
┌─       
╵ 0 1 2  
  3 4 5  
        ┘

𝕨 ⍷ 𝕩: Find

Mark the top left location of the occurrences of 𝕨 in 𝕩 with a 1, and other locations with 0.

Result is the same shape as (≢𝕨)↕x.

       "string" ⍷ "substring"
⟨ 0 0 0 1 ⟩

       "loooooong" ⍷ "short"
⟨⟩

       b ← 7 (4|⋆˜)⌜○↕ 9

       c ← (0‿3‿0≍0‿1‿0)

       c ⍷ b
┌─               
╵ 0 0 0 0 0 0 0  
  0 0 0 0 0 0 0  
  0 0 0 0 0 0 0  
  0 0 1 0 0 0 1  
  0 0 0 0 0 0 0  
  0 0 1 0 0 0 1  
                ┘