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‎.github/dependabot.yml

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version: 2
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updates:
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# Enable updates to the dependencies of our workflows
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- package-ecosystem: 'github-actions'
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directory: '/'
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schedule:
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interval: daily

‎.github/workflows/deploy.yml

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name: Deploy Archive
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on:
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workflow_dispatch:
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schedule:
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- cron: 30 4 * * *
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jobs:
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deploy:
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runs-on: ubuntu-latest
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name: Publish zulip-archive on GH Pages
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steps:
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- uses: actions/checkout@v4
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- uses: zulip/zulip-archive@5ff607209cbd3a7ff74cbca84656d01bfc8b5929
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with:
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zuliprc: ${{ secrets.ZULIPRC }}
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# archive_branch: main
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github_token: ${{ secrets.DEPLOY_PAT }}
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delete_history: true

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‎index.html

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<html>
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<head><meta charset="utf-8"><title>Zulip Chat Archive</title></head>
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<hr>
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<h2>Streams:</h2>
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<ul>
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<li> <a href="stream/274208-helpdesk-.28published.29/index.html">helpdesk (published)</a> (757 topics) </li>
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</ul>
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<hr><p>Last updated: Mar 06 2025 at 04:41 UTC</p>
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‎sitemap-001-pages.xml.gz

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‎sitemap.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
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<!-- Powered by https://github.com/pigs-will-fly/py-xml-sitemap-writer -->
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<!-- 560 urls -->
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<sitemap><loc>https://juliacommunity.github.io/zulip-archive/sitemap-001-pages.xml.gz</loc></sitemap>
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</sitemapindex>

‎stream/274208-helpdesk-.28published.29/index.html

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‎stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html

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<html>
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<head><meta charset="utf-8"><title>&quot;Broadcast foreach&quot;? · helpdesk (published) · Zulip Chat Archive</title></head>
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<h2>Stream: <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/index.html">helpdesk (published)</a></h2>
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<h3>Topic: <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html">&quot;Broadcast foreach&quot;?</a></h3>
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<hr>
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<base href="https://julialang.zulipchat.com">
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<head><link href="https://juliacommunity.github.io/zulip-archive/style.css" rel="stylesheet"></head>
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<a name="262235042"></a>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262235042" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Philipp Gabler <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262235042">(Nov 21 2021 at 11:06)</a>:</h4>
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<p>Is there an established pattern to "broadcast" a function, but without allocation of output? Just for the sake of side-effects. I.e., <code>map</code> is to <code>broadcast</code> as <code>foreach</code> is to what?</p>
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<p>I came up with this:</p>
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<div class="codehilite" data-code-language="Julia"><pre><span></span><code><span class="n">julia</span><span class="o">&gt;</span> <span class="k">function</span> <span class="n">broadcast_foreach</span><span class="p">(</span><span class="n">op</span><span class="p">,</span> <span class="n">args</span><span class="o">...</span><span class="p">)</span>
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<span class="n">bc</span> <span class="o">=</span> <span class="n">Base</span><span class="o">.</span><span class="n">broadcasted</span><span class="p">(</span><span class="n">op</span><span class="p">,</span> <span class="n">args</span><span class="o">...</span><span class="p">)</span>
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<span class="n">foreach</span><span class="p">(</span><span class="n">x</span> <span class="o">-&gt;</span> <span class="nb">nothing</span><span class="p">,</span> <span class="n">bc</span><span class="p">)</span>
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<span class="k">return</span> <span class="nb">nothing</span>
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<span class="k">end</span>
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<span class="n">broadcast_foreach</span> <span class="p">(</span><span class="n">generic</span> <span class="k">function</span> <span class="n">with</span> <span class="mi">1</span> <span class="n">method</span><span class="p">)</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">xs</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="kt">Any</span><span class="p">[]</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">broadcast_foreach</span><span class="p">((</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="o">...</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">push!</span><span class="p">(</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="p">),</span> <span class="kt">Ref</span><span class="p">(</span><span class="n">xs</span><span class="p">),</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">],</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">])</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">xs</span>
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<span class="mi">2</span><span class="o">-</span><span class="n">element</span> <span class="kt">Vector</span><span class="p">{</span><span class="kt">Any</span><span class="p">}</span><span class="o">:</span>
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<span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
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<span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="p">)</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">xs</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="kt">Any</span><span class="p">[]</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">broadcast_foreach</span><span class="p">((</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="o">...</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">push!</span><span class="p">(</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="p">),</span> <span class="kt">Ref</span><span class="p">(</span><span class="n">xs</span><span class="p">),</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">],</span> <span class="mi">1</span><span class="p">)</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">xs</span>
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<span class="mi">2</span><span class="o">-</span><span class="n">element</span> <span class="kt">Vector</span><span class="p">{</span><span class="kt">Any</span><span class="p">}</span><span class="o">:</span>
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<span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
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<span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
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</code></pre></div>
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<p>but not knowing as much about broadcasting machinery as I'd like to, there might be something existing I am overlooking.</p>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262254718" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Mason Protter <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262254718">(Nov 21 2021 at 18:57)</a>:</h4>
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<p>One approach you could take is making a struct <code>Null</code> such that writing data to it just throws away the data. Then you could do something like<br>
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<code>Null() .= f.(x)</code> and broadcast Fusion should take care of everything.</p>
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<a name="262319796"></a>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262319796" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Philipp Gabler <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262319796">(Nov 22 2021 at 13:44)</a>:</h4>
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<p>I was thinking about that, too, but didn't know how to proceed. Some issues with broadcast style (I guess?):</p>
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<div class="codehilite" data-code-language="Julia"><pre><span></span><code><span class="n">julia</span><span class="o">&gt;</span> <span class="k">struct</span> <span class="kt">Null</span> <span class="k">end</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">Base</span><span class="o">.</span><span class="n">copyto!</span><span class="p">(</span><span class="o">::</span><span class="kt">Null</span><span class="p">,</span> <span class="n">bc</span><span class="o">::</span><span class="kt">Broadcast</span><span class="o">.</span><span class="kt">Broadcasted</span><span class="p">{</span><span class="kt">Nothing</span><span class="p">})</span> <span class="o">=</span> <span class="p">(</span><span class="n">foreach</span><span class="p">(</span><span class="n">_</span> <span class="o">-&gt;</span> <span class="nb">nothing</span><span class="p">,</span> <span class="n">bc</span><span class="p">);</span> <span class="n">Null</span><span class="p">())</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">f</span><span class="p">(</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="o">...</span><span class="p">)</span> <span class="o">=</span> <span class="n">push!</span><span class="p">(</span><span class="n">xs</span><span class="p">,</span> <span class="n">vs</span><span class="p">)</span>
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<span class="n">f</span> <span class="p">(</span><span class="n">generic</span> <span class="k">function</span> <span class="n">with</span> <span class="mi">1</span> <span class="n">method</span><span class="p">)</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">xs</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="kt">Any</span><span class="p">[]</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="n">Null</span><span class="p">()</span> <span class="o">.=</span> <span class="n">f</span><span class="o">.</span><span class="p">(</span><span class="kt">Ref</span><span class="p">(</span><span class="n">xs</span><span class="p">),</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">],</span> <span class="mi">1</span><span class="p">)</span>
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<span class="n">ERROR</span><span class="o">:</span> <span class="kt">MethodError</span><span class="o">:</span> <span class="n">no</span> <span class="n">method</span> <span class="n">matching</span> <span class="n">ndims</span><span class="p">(</span><span class="o">::</span><span class="kt">Type</span><span class="p">{</span><span class="kt">Null</span><span class="p">})</span>
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<span class="o">...</span>
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</code></pre></div>
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<a name="262359734"></a>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262359734" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Michael Abbott <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262359734">(Nov 22 2021 at 18:35)</a>:</h4>
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<p>I think you want to catch it earlier:</p>
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<div class="codehilite" data-code-language="Julia"><pre><span></span><code><span class="n">Broadcast</span><span class="o">.</span><span class="n">materialize!</span><span class="p">(</span><span class="n">dest</span><span class="o">::</span><span class="kt">Null</span><span class="p">,</span> <span class="n">bc</span><span class="o">::</span><span class="kt">Base</span><span class="o">.</span><span class="n">Broadcast</span><span class="o">.</span><span class="n">Broadcasted</span><span class="p">)</span> <span class="o">=</span> <span class="p">(</span><span class="n">foreach</span><span class="p">(</span><span class="n">_</span> <span class="o">-&gt;</span> <span class="nb">nothing</span><span class="p">,</span> <span class="n">bc</span><span class="p">);</span> <span class="n">Null</span><span class="p">())</span>
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</code></pre></div>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262360772" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Michael Abbott <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262360772">(Nov 22 2021 at 18:44)</a>:</h4>
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<p>It is not quite as efficient as ordinary broadcasting. IIRC there were some such issues with <code>sum(::Broadcasted)</code>:</p>
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<div class="codehilite" data-code-language="Julia"><pre><span></span><code><span class="n">julia</span><span class="o">&gt;</span> <span class="n">x</span> <span class="o">=</span> <span class="n">rand</span><span class="p">(</span><span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">);</span> <span class="n">y</span> <span class="o">=</span> <span class="n">rand</span><span class="p">(</span><span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">);</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="nd">@btime</span> <span class="n">sin</span><span class="o">.</span><span class="p">(</span><span class="o">$</span><span class="n">x</span> <span class="o">./</span> <span class="o">$</span><span class="n">y</span> <span class="o">.+</span> <span class="mi">1</span><span class="p">);</span>
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<span class="n">min</span> <span class="mf">77.958</span> <span class="n">μs</span><span class="p">,</span> <span class="n">mean</span> <span class="mf">86.330</span> <span class="n">μs</span> <span class="p">(</span><span class="mi">2</span> <span class="n">allocations</span><span class="p">,</span> <span class="mf">78.17</span> <span class="n">KiB</span><span class="o">.</span> <span class="n">GC</span> <span class="n">mean</span> <span class="mf">2.82</span><span class="o">%</span><span class="p">)</span>
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<span class="n">julia</span><span class="o">&gt;</span> <span class="nd">@btime</span> <span class="nb">nothing</span> <span class="o">.=</span> <span class="n">sin</span><span class="o">.</span><span class="p">(</span><span class="o">$</span><span class="n">x</span> <span class="o">./</span> <span class="o">$</span><span class="n">y</span> <span class="o">.+</span> <span class="mi">1</span><span class="p">);</span>
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<span class="n">min</span> <span class="mf">150.667</span> <span class="n">μs</span><span class="p">,</span> <span class="n">mean</span> <span class="mf">154.272</span> <span class="n">μs</span> <span class="p">(</span><span class="mi">0</span> <span class="n">allocations</span><span class="p">)</span>
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</code></pre></div>
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<h4><a href="https://julialang.zulipchat.com#narrow/stream/274208-helpdesk%20%28published%29/topic/%22Broadcast%20foreach%22%3F/near/262499866" class="zl"><img src="https://juliacommunity.github.io/zulip-archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Mason Protter <a href="https://juliacommunity.github.io/zulip-archive/stream/274208-helpdesk-.28published.29/topic/.22Broadcast.20foreach.22.3F.html#262499866">(Nov 23 2021 at 19:08)</a>:</h4>
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<p>Hm. I would have thought that <code>Broadcast.instantiate(bc)</code> would have fixed it but it didn't</p>
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<hr><p>Last updated: Mar 06 2025 at 04:41 UTC</p>
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