Epsilon Underbar (⍷)

⍷ 𝕩: Deduplicate

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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

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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  
                ┘