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<title>BQN: Element Of (∊)</title>
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<h1 id="element-of-"><a class="header" href="#element-of-">Element Of (<code><span class='Function'>∊</span></code>)</a></h1>
<h2 id="-𝕩-mark-firsts"><a class="header" href="#-𝕩-mark-firsts"><code><span class='Function'>∊</span> <span class='Value'>𝕩</span></code>: Mark Firsts</a></h2>
<p><a class="fulldoc" href="../doc/selfcmp.html#mark-firsts">→full documentation</a></p>
<p>Mark the first occurrence of each major cell in <code><span class='Value'>𝕩</span></code> with a 1, and all other occurrences with a 0.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=4oiKIDTigL814oC/NuKAvzbigL804oC/N+KAvzUKCmEg4oaQIDPigL8zIOKliiDihpU5CgriiIogYQ==">↗️</a><pre> <span class='Function'>∊</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>6</span><span class='Ligature'>‿</span><span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>7</span><span class='Ligature'>‿</span><span class='Number'>5</span>
⟨ 1 1 1 0 0 1 0 ⟩
<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>
⟨ 1 1 1 ⟩
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<h2 id="𝕨--𝕩-member-of"><a class="header" href="#𝕨--𝕩-member-of"><code><span class='Value'>𝕨</span> <span class='Function'>∊</span> <span class='Value'>𝕩</span></code>: Member Of</a></h2>
<p><a class="fulldoc" href="../doc/search.html#member-of">→full documentation</a></p>
<p>Is each cell in <code><span class='Value'>𝕨</span></code> a 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=4p+oMeKfqSDiiIog4oaVOQoKYiDihpAgM+KAvzMg4qWKIOKGlTkKCuKfqDDigL8x4oC/MuKfqSDiiIogYgoK4p+oMeKAvzMg4qWKIDDigL8x4oC/MuKfqSDiiIogYg==">↗️</a><pre> <span class='Bracket'>⟨</span><span class='Number'>1</span><span class='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Function'>↕</span><span class='Number'>9</span>
⟨ 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='Bracket'>⟨</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>b</span>
┌·
· 0
┘
<span class='Bracket'>⟨</span><span class='Number'>1</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='Bracket'>⟩</span> <span class='Function'>∊</span> <span class='Value'>b</span>
┌·
· 0
┘
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