docs/help/firstcell_select.html


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  <title>BQN: Square Image Of (⊏)</title>
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<h1 id="square-image-of-"><a class="header" href="#square-image-of-">Square Image Of (<code><span class='Function'>⊏</span></code>)</a></h1>
<h2 id="-𝕩-first-cell"><a class="header" href="#-𝕩-first-cell"><code><span class='Function'>⊏</span> <span class='Value'>𝕩</span></code>: First Cell</a></h2>
<p>First major cell of <code><span class='Value'>𝕩</span></code>.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4oqPIOKfqDEsIDIsIDPin6kKCiAgIGEg4oaQIDPigL8zIOKliiDihpU5CgogICDiio8gYQ==">↗️</a><pre>       <span class='Function'>⊏</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
┌·   
· 1  
    ┘

       <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='Function'>↕</span><span class='Number'>9</span>

       <span class='Function'>⊏</span> <span class='Value'>a</span>
⟨ 0 1 2 ⟩
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<h2 id="𝕨--𝕩-select"><a class="header" href="#𝕨--𝕩-select"><code><span class='Value'>𝕨</span> <span class='Function'>⊏</span> <span class='Value'>𝕩</span></code>: Select</a></h2>
<p>Select the major cells of <code><span class='Value'>𝕨</span></code> at the indices in <code><span class='Value'>𝕩</span></code>.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAgMuKAvzAg4oqPIOKfqDEsIDIsIDPin6kKCiAgIGIg4oaQIDPigL8zIOKliiDihpU5CgogICAy4oC/MCDiio8gYg==">↗️</a><pre>       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Separator'>,</span> <span class='Number'>2</span><span class='Separator'>,</span> <span class='Number'>3</span><span class='Bracket'>⟩</span>
⟨ 3 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='Function'>↕</span><span class='Number'>9</span>

       <span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>0</span> <span class='Function'>⊏</span> <span class='Value'>b</span>
┌─       
╵ 6 7 8  
  0 1 2  
        ┘
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