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<title>BQN: Square Original Of (⊐)</title>
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<h1 id="square-original-of-"><a class="header" href="#square-original-of-">Square Original Of (<code><span class='Function'>⊐</span></code>)</a></h1>
<h2 id="-𝕩-classify"><a class="header" href="#-𝕩-classify"><code><span class='Function'>⊐</span> <span class='Value'>𝕩</span></code>: Classify</a></h2>
<p>Translate major cells of <code><span class='Value'>𝕩</span></code> to unique ID numbers based on first occurrence.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oqQIDXigL824oC/MuKAvzLigL814oC/MQoKYSDihpAgM+KAvzMg4qWKIDDigL8x4oC/MuKAvznigL8w4oC/OeKAvzDigL8x4oC/MgoK4oqQIGE=">↗️</a><pre> <span class='Function'>⊐</span> <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>1</span>
⟨ 0 1 2 2 0 3 ⟩
<span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span>
<span class='Function'>⊐</span> <span class='Value'>a</span>
⟨ 0 1 0 ⟩
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<h2 id="𝕨--𝕩-index-of"><a class="header" href="#𝕨--𝕩-index-of"><code><span class='Value'>𝕨</span> <span class='Function'>⊐</span> <span class='Value'>𝕩</span></code>: Index Of</a></h2>
<p>First index of each major cell of <code><span class='Value'>𝕩</span></code> in <code><span class='Value'>𝕨</span></code>. Rank of <code><span class='Value'>𝕩</span></code> must be at least cell rank of <code><span class='Value'>𝕨</span></code>.</p>
<p>If a cell is not found in <code><span class='Value'>𝕨</span></code>, the length of <code><span class='Value'>𝕨</span></code> (<code><span class='Function'>≠</span><span class='Value'>𝕨</span></code>) is used for that position.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=NeKAvzbigL8y4oC/MuKAvzXigL8xIOKKkCA14oC/N+KAvzHigL82CgpiIOKGkCAz4oC/MyDipYogMOKAvzHigL8y4oC/OeKAvzDigL854oC/MOKAvzHigL8yCgpiIOKKkCDiiY054oC/MOKAvzk=">↗️</a><pre> <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>1</span> <span class='Function'>⊐</span> <span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>7</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>6</span>
⟨ 0 6 5 1 ⟩
<span class='Value'>b</span> <span class='Gets'>←</span> <span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>⥊</span> <span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span>
<span class='Value'>b</span> <span class='Function'>⊐</span> <span class='Function'>≍</span><span class='Number'>9</span><span class='Ligature'>‿</span><span class='Number'>0</span><span class='Ligature'>‿</span><span class='Number'>9</span>
⟨ 1 ⟩
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