help/classify_indexof.md


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*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/classify_indexof.html).*

# Square Original Of (`⊐`)

## `⊐ 𝕩`: Classify

First index of each major cell of `𝕩` in `𝕩`.

           ⊐ 5‿6‿2‿2‿5‿1

           a ← 3‿3 ⥊ 0‿1‿2‿9‿0‿9‿0‿1‿2

           ⊐ a


## `𝕨 ⊐ 𝕩`: Index Of

First index of each major cell of `𝕩` in `𝕨`. Rank of `𝕩` must be at least cell rank of 𝕨`.

If a cell is not found in `𝕨`, that position will contain the length of `𝕨` (`≠𝕨`).

           5‿6‿2‿2‿5‿1 ⊐ 5‿2‿1‿6

           b ← 3‿3 ⥊ 0‿1‿2‿9‿0‿9‿0‿1‿2

           b ⊐ ⟨9‿0‿9⟩