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<head>
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<title>BQN: Up Arrow (`↑`)</title>
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<div class="nav">(<a href="https://github.com/mlochbaum/BQN">github</a>) / <a href="../index.html">BQN</a> / <a href="index.html">help</a></div>
<h1 id="up-arrow-"><a class="header" href="#up-arrow-">Up Arrow (<code><span class='Function'>↑</span></code>)</a></h1>
<h2 id="--prefixes"><a class="header" href="#--prefixes"><code><span class='Function'>↑</span> <span class='Value'>𝕩</span></code>: Prefixes</a></h2>
<p>Prefixes of array <code><span class='Value'>𝕩</span></code> along its first axis.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAg4oaRIDHigL8y4oC/M+KAvzQKCiAgIGEg4oaQIDPigL8zIOKliiDihpU5CgogICDihpEgYQ==">↗️</a><pre> <span class='Function'>↑</span> <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>2</span><span class='Ligature'>‿</span><span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>4</span>
⟨ ⟨⟩ ⟨ 1 ⟩ ⟨ 1 2 ⟩ ⟨ 1 2 3 ⟩ ⟨ 1 2 3 4 ⟩ ⟩
<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‿3 ┌─ ┌─ ┌─
╵ 0 1 2 ╵ 0 1 2 ╵ 0 1 2
┘ 3 4 5 3 4 5
┘ 6 7 8
┘
┘
</pre>
<h2 id="---take"><a class="header" href="#---take"><code><span class='Value'>𝕨</span> <span class='Function'>↑</span> <span class='Value'>𝕩</span></code>: Take</a></h2>
<p>For each integer in <code><span class='Value'>𝕨</span></code>, take that many elements from each dimension of <code><span class='Value'>𝕩</span></code>.</p>
<p>Negative numbers take from the end.</p>
<p>If any of the elements in <code><span class='Value'>𝕨</span></code> are greater than the length of their respective dimension, the dimension is extended with a fill value.</p>
<a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=ICAzIOKGkSAx4oC/M+KAvzXigL82NwoKICBhIOKGkCA04oC/NCDipYog4oaVMTYKCiAgM+KAvzMg4oaRIGEKCiAgNeKAvzUg4oaRIGEKCiAgM+KAv8KvMyDihpEgYQ==">↗️</a><pre> <span class='Number'>3</span> <span class='Function'>↑</span> <span class='Number'>1</span><span class='Ligature'>‿</span><span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>67</span>
⟨ 1 3 5 ⟩
<span class='Value'>a</span> <span class='Gets'>←</span> <span class='Number'>4</span><span class='Ligature'>‿</span><span class='Number'>4</span> <span class='Function'>⥊</span> <span class='Function'>↕</span><span class='Number'>16</span>
<span class='Error'>Error: Redefinition</span>
<span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
┌─
╵ 0 1 2
3 4 5
6 7 8
┘
<span class='Number'>5</span><span class='Ligature'>‿</span><span class='Number'>5</span> <span class='Function'>↑</span> <span class='Value'>a</span>
┌─
╵ 0 1 2 0 0
3 4 5 0 0
6 7 8 0 0
0 0 0 0 0
0 0 0 0 0
┘
<span class='Number'>3</span><span class='Ligature'>‿</span><span class='Number'>¯3</span> <span class='Function'>↑</span> <span class='Value'>a</span>
┌─
╵ 0 1 2
3 4 5
6 7 8
┘
</pre>
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