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<!DOCTYPE html>
<html lang="en"><head>
<script src="presentation_files/libs/clipboard/clipboard.min.js"></script>
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<meta name="generator" content="quarto-1.2.269">
<meta name="author" content="Andreas M. Brandmaier and Leonie Hagitte">
<title>An Introduction to Shiny</title>
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<body class="quarto-light">
<div class="reveal">
<div class="slides">
<section id="title-slide" class="quarto-title-block center">
<h1 class="title">An Introduction to Shiny</h1>
<p class="subtitle">Hands-on workshop</p>
<div class="quarto-title-authors">
<div class="quarto-title-author">
<div class="quarto-title-author-name">
Andreas M. Brandmaier and Leonie Hagitte
</div>
</div>
</div>
<p class="date">7/1/23</p>
</section>
<section>
<section id="welcome" class="title-slide slide level1 center">
<h1>Welcome</h1>
</section>
<section id="ask-questions-anytime" class="slide level2">
<h2>Ask questions anytime</h2>
<img data-src="images/undraw_Engineering_team_a7n2.png" class="r-stretch"></section>
<section id="this-is-us" class="slide level2">
<h2>This is us</h2>
<p>Andreas (find me on <a href="https://www.twitter.com/brandmaier" title="Twitter">Twitter</a>)</p>
<p>Leonie (find me on <a href="https://www.linkedin.com/in/leonie-hagitte-1130b8231/" title="LinkedIn">LinkedIn</a>)</p>
</section>
<section id="shiny" class="slide level2">
<h2>Shiny</h2>
<blockquote>
<p>Shiny is an R package that makes it easy to build interactive web apps in R</p>
</blockquote>
<div class="columns">
<div class="column" style="width:60%;">
<p>Apps can be</p>
<p>-standalone, - deployed to a website, - or be part of an interactive (Markdown) document</p>
</div><div class="column" style="width:40%;">
<p><img data-src="https://raw.githubusercontent.com/rstudio/hex-stickers/master/thumbs/shiny.png"></p>
</div>
</div>
</section>
<section id="required-software" class="slide level2">
<h2>Required software</h2>
<p>You need to install these software packages in order to follow along with the examples of today:</p>
<ul>
<li><strong>R</strong>: https://cran.r-project.org</li>
<li><strong>RStudio</strong>: https://rstudio.com/products/rstudio/download/</li>
<li><strong>shiny</strong></li>
<li><strong>tidyverse packages</strong> (and some others)</li>
</ul>
<div class="cell">
<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1"></a><span class="fu">install.packages</span>(<span class="fu">c</span>(<span class="st">"shiny"</span>,<span class="st">"tidyverse"</span>, <span class="st">"ggraph"</span>,<span class="st">"palmerpenguins"</span>))</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section></section>
<section>
<section id="what-to-expect" class="title-slide slide level1 center">
<h1>What to expect</h1>
<div class="columns">
<div class="column" style="width:60%;">
<ul>
<li>This is a hands-on workshop; you’ll get the most out of it if you download the materials and actively participate</li>
<li>Introductory R coding skills are OK! We have exercises at varying levels of proficiency</li>
<li>The workshop materials remain open and accessible after the workshop</li>
<li>Feel free to team up! ]</li>
</ul>
</div><div class="column" style="width:30%;">
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="images/undraw_Cooking_p7m1.png"></p>
<p></p><figcaption>an image</figcaption><p></p>
</figure>
</div>
</div>
</div>
</section>
<section class="slide level2">
</section></section>
<section id="goals" class="title-slide slide level1 center">
<h1>Goals</h1>
</section>
<section>
<section id="objectives-of-today" class="title-slide slide level1 center">
<h1>Objectives of today</h1>
<div>
<ul>
<li class="fragment"><p>Learn about the structure of a shiny application.</p></li>
<li class="fragment"><p>Learn how to create shiny apps from a template.</p></li>
<li class="fragment"><p>Learn how to think in terms of <em>inputs</em> and <em>outputs</em>.</p></li>
<li class="fragment"><p>Write your own app (using simulated data, real data or <em>your</em> data)</p></li>
</ul>
</div>
</section>
<section id="content" class="slide level2">
<h2>Content</h2>
<p>Let’s talk about…</p>
<div>
<ul>
<li class="fragment">User-interface / Layout</li>
<li class="fragment">Reactivity / Logic</li>
<li class="fragment">Awesome visualizations</li>
</ul>
</div>
</section>
<section id="anatomy-of-a-shiny-app" class="slide level2">
<h2>Anatomy of a Shiny app</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb2" data-code-line-numbers="|1|3,6|4"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1"></a><span class="fu">library</span>(shiny)</span>
<span id="cb2-2"><a href="#cb2-2"></a></span>
<span id="cb2-3"><a href="#cb2-3"></a><span class="fu">shinyApp</span>(</span>
<span id="cb2-4"><a href="#cb2-4"></a> <span class="at">ui =</span> <span class="fu">list</span>(),</span>
<span id="cb2-5"><a href="#cb2-5"></a> <span class="at">server =</span> <span class="cf">function</span>(input, output, session) { }</span>
<span id="cb2-6"><a href="#cb2-6"></a>)</span>
<span id="cb2-7"><a href="#cb2-7"></a><span class="fu">shinyApp</span>(ui, server)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>The <code>ui</code> specifies the <em>visible</em> user interface</p>
<ul>
<li>Dynamic elements <em>inputs</em> and <em>outputs</em></li>
<li>Static elements like headings, text, static images</li>
<li>A layout how to arrange these things</li>
</ul>
</section>
<section id="anatomy-of-a-shiny-app-1" class="slide level2">
<h2>Anatomy of a Shiny app</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb3" data-code-line-numbers="5|7"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1"></a><span class="fu">library</span>(shiny)</span>
<span id="cb3-2"><a href="#cb3-2"></a></span>
<span id="cb3-3"><a href="#cb3-3"></a><span class="fu">shinyApp</span>(</span>
<span id="cb3-4"><a href="#cb3-4"></a> <span class="at">ui =</span> <span class="fu">list</span>(),</span>
<span id="cb3-5"><a href="#cb3-5"></a> <span class="at">server =</span> <span class="cf">function</span>(input, output, session) { }</span>
<span id="cb3-6"><a href="#cb3-6"></a>)</span>
<span id="cb3-7"><a href="#cb3-7"></a><span class="fu">shinyApp</span>(ui, server)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>The <code>server</code> is <em>invisible</em> and is responsible for all computations</p>
<ul>
<li>The <code>server</code> monitors <em>inputs</em></li>
<li>When inputs change, <em>outputs</em> are updated (<em>reactivity</em>)</li>
</ul>
</section></section>
<section>
<section id="user-interface" class="title-slide slide level1 center">
<h1>User-interface</h1>
</section>
<section id="shiny-widgets-gallery" class="slide level2">
<h2>Shiny Widgets Gallery</h2>
<div style="text-align: center">
<p><a href="https://shiny.rstudio.com/gallery/widget-gallery.html">shiny.rstudio.com/gallery/widget-gallery.html</a></p>
</div>
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</section>
<section id="example" class="slide level2">
<h2>Example</h2>
<p>Inputs have unique ids that correspond to server-side variables, a label, a starting value and extra options (e.g., range restrictions, etc.)</p>
<p><code>textInput(inputId="familyname", label="Family name:", value="Steve Miller" )</code></p>
<p>or</p>
<p><code>numericInput(inputId="age", label="Age (in years):", value=1, min=0, max=150 )</code></p>
<p>On the server, we will be able to access variables <code>input$familyname</code> and <code>input$age</code></p>
</section></section>
<section>
<section id="layout" class="title-slide slide level1 center">
<h1>Layout</h1>
</section>
<section id="sidebar-layout" class="slide level2">
<h2>Sidebar layout</h2>
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="images/sidebar.png" style="width:75.0%"></p>
</figure>
</div>
<aside><div>
<p>From <a href="https://mastering-shiny.org/action-layout.html#page-with-sidebar">Mastering Shiny</a></p>
</div></aside></section>
<section id="multi-row-layout" class="slide level2">
<h2>Multi-row layout</h2>
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="images/multirow.png" style="width:75.0%"></p>
</figure>
</div>
<aside><div>
<p>From <a href="https://mastering-shiny.org/action-layout.html#multi-row">Mastering Shiny</a></p>
</div></aside></section>
<section id="other-layouts" class="slide level2">
<h2>Other layouts</h2>
<p>Many more, e.g. Tabsets - see <code>tabsetPanel()</code></p>
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="images/tabset.png" style="width:75.0%"></p>
</figure>
</div>
<aside><div>
<p>From <a href="https://mastering-shiny.org/action-layout.html#multi-row">Mastering Shiny</a></p>
</div></aside></section>
<section id="outputs" class="slide level2">
<h2>Outputs</h2>
<p>Example output elements (placeholders for dynamic content):</p>
<ul>
<li><p><code>textOutput()</code></p></li>
<li><p><code>plotOutput()</code></p></li>
<li><p><code>tableOutput()</code></p></li>
</ul>
<p>You can use</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1"></a><span class="fu">help.search</span>(<span class="st">"Output"</span>, <span class="at">package =</span> <span class="st">"shiny"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>to find other output functions in shiny.</p>
</section>
<section id="outputs-and-renderers" class="slide level2">
<h2>Outputs and Renderers</h2>
<p>Each <code>*Output()</code> function has a corresponding <code>render*()</code> server-side function. For example:</p>
<ul>
<li><code>textOutput()</code> <span class="math inline">\(\rightarrow\)</span> <code>renderText()</code></li>
<li><code>plotOutput()</code> <span class="math inline">\(\rightarrow\)</span> <code>renderPlot()</code></li>
<li><code>tableOutput()</code> <span class="math inline">\(\rightarrow\)</span> <code>renderTable()</code></li>
</ul>
</section>
<section id="server-logic-accessing-inputs" class="slide level2">
<h2>Server logic: Accessing inputs</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb5" data-code-line-numbers="3"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1"></a><span class="fu">shinyApp</span>(</span>
<span id="cb5-2"><a href="#cb5-2"></a> <span class="at">ui =</span> <span class="fu">list</span>(),</span>
<span id="cb5-3"><a href="#cb5-3"></a> <span class="at">server =</span> <span class="cf">function</span>(input, output, session) { }</span>
<span id="cb5-4"><a href="#cb5-4"></a>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<ul>
<li><p>Inputs are accessed in the <em>server</em> function via the <em>input</em> argument.</p></li>
<li><p>Inputs are <em>reactive</em>, meaning that changes trigger updates to outputs.</p></li>
</ul>
</section></section>
<section>
<section id="example-a-pocket-calculator" class="title-slide slide level1 center">
<h1>Example: A pocket calculator</h1>
</section>
<section id="demo-1---plus-one" class="slide level2">
<h2>Demo 1 - Plus One</h2>
<p>Demo: We write a simple calculator that adds +1 to a number we enter.</p>
<p>The simplest structure of a reactive program involves just a source and an endpoint:</p>
<div class="cell" data-reveal="true">
<div class="cell-output-display">
<div>
<p>
</p><pre class="mermaid mermaid-js" data-tooltip-selector="#mermaid-tooltip-1">flowchart LR
subgraph outputs
re([result])
end
subgraph inputs
n1([number])
end
n1 --> re
</pre>
<div id="mermaid-tooltip-1" class="mermaidTooltip">
</div>
<p></p>
</div>
</div>
</div>
</section>
<section id="demo-1---plus-one-1" class="slide level2">
<h2>Demo 1 - Plus One</h2>
<div class="code-file sourceCode cell-code">
<p><svg aria-hidden="true" role="img" viewbox="0 0 384 512" style="height:1em;width:0.75em;vertical-align:-0.125em;margin-left:auto;margin-right:auto;font-size:inherit;fill:currentColor;overflow:visible;position:relative;"><path d="M0 64C0 28.65 28.65 0 64 0H229.5C246.5 0 262.7 6.743 274.7 18.75L365.3 109.3C377.3 121.3 384 137.5 384 154.5V448C384 483.3 355.3 512 320 512H64C28.65 512 0 483.3 0 448V64zM336 448V160H256C238.3 160 224 145.7 224 128V48H64C55.16 48 48 55.16 48 64V448C48 456.8 55.16 464 64 464H320C328.8 464 336 456.8 336 448z"></path></svg> <code>demos/demo1.R</code></p>
</div>
<div class="cell" data-file="demos/demo1.R">
<div class="sourceCode cell-code" id="cb6" data-code-line-numbers="|1-3|5-27|6-17|18-26"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb6-1"><a href="#cb6-1"></a><span class="fu">library</span>(shiny)</span>
<span id="cb6-2"><a href="#cb6-2"></a></span>
<span id="cb6-3"><a href="#cb6-3"></a><span class="co"># Define UI for application that draws a histogram</span></span>
<span id="cb6-4"><a href="#cb6-4"></a>ui <span class="ot"><-</span> <span class="fu">fluidPage</span>(</span>
<span id="cb6-5"><a href="#cb6-5"></a> </span>
<span id="cb6-6"><a href="#cb6-6"></a> <span class="co"># Application title</span></span>
<span id="cb6-7"><a href="#cb6-7"></a> <span class="fu">titlePanel</span>(<span class="st">"Calculator"</span>),</span>
<span id="cb6-8"><a href="#cb6-8"></a> </span>
<span id="cb6-9"><a href="#cb6-9"></a> <span class="co"># Sidebar with a slider input for number of bins </span></span>
<span id="cb6-10"><a href="#cb6-10"></a> <span class="fu">sidebarLayout</span>(</span>
<span id="cb6-11"><a href="#cb6-11"></a> <span class="fu">sidebarPanel</span>(</span>
<span id="cb6-12"><a href="#cb6-12"></a> <span class="fu">numericInput</span>(<span class="st">"number"</span>,</span>
<span id="cb6-13"><a href="#cb6-13"></a> <span class="st">"Number"</span>, <span class="at">value=</span><span class="dv">0</span>)</span>
<span id="cb6-14"><a href="#cb6-14"></a> ),</span>
<span id="cb6-15"><a href="#cb6-15"></a> </span>
<span id="cb6-16"><a href="#cb6-16"></a> <span class="co"># Show a plot of the generated distribution</span></span>
<span id="cb6-17"><a href="#cb6-17"></a> <span class="fu">mainPanel</span>(</span>
<span id="cb6-18"><a href="#cb6-18"></a> <span class="fu">h3</span>(<span class="st">"Result"</span>),</span>
<span id="cb6-19"><a href="#cb6-19"></a> <span class="fu">textOutput</span>(<span class="st">"result"</span>)</span>
<span id="cb6-20"><a href="#cb6-20"></a> )</span>
<span id="cb6-21"><a href="#cb6-21"></a> )</span>
<span id="cb6-22"><a href="#cb6-22"></a>)</span>
<span id="cb6-23"><a href="#cb6-23"></a></span>
<span id="cb6-24"><a href="#cb6-24"></a><span class="co"># Define server logic required to draw a histogram</span></span>
<span id="cb6-25"><a href="#cb6-25"></a>server <span class="ot"><-</span> <span class="cf">function</span>(input, output) {</span>
<span id="cb6-26"><a href="#cb6-26"></a> </span>
<span id="cb6-27"><a href="#cb6-27"></a> output<span class="sc">$</span>result <span class="ot"><-</span> <span class="fu">renderText</span>({</span>
<span id="cb6-28"><a href="#cb6-28"></a> <span class="fu">return</span>(input<span class="sc">$</span>number <span class="sc">+</span> <span class="dv">1</span>)</span>
<span id="cb6-29"><a href="#cb6-29"></a> })</span>
<span id="cb6-30"><a href="#cb6-30"></a>}</span>
<span id="cb6-31"><a href="#cb6-31"></a></span>
<span id="cb6-32"><a href="#cb6-32"></a><span class="co"># Run the application </span></span>
<span id="cb6-33"><a href="#cb6-33"></a><span class="fu">shinyApp</span>(<span class="at">ui =</span> ui, <span class="at">server =</span> server)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section>
<section id="your-turn---exercise-1" class="slide level2">
<h2>Your turn - Exercise 1</h2>
<p>Copy the code from the previous slide (or open <code>exercises/ex1.R</code>) and run it in R</p>
<p>Check that you are able successfully run the shiny app and are able to interact with it.</p>
<ul>
<li>If everything is working try modifying the code (e.g. try adding a second number input and change the logic so that both numbers are added).</li>
</ul>
<p><countdown time="300"></countdown></p>
</section>
<section id="reactive-diagram" class="slide level2">
<h2>Reactive diagram</h2>
<div class="cell" data-reveal="true">
<div class="cell-output-display">
<div>
<p>
</p><pre class="mermaid mermaid-js" data-tooltip-selector="#mermaid-tooltip-2">flowchart LR
subgraph outputs
re([result])
end
subgraph inputs
n1([number1])
n2([number2])
end
n1 --> re
n2 --> re
</pre>
<div id="mermaid-tooltip-2" class="mermaidTooltip">
</div>
<p></p>
</div>
</div>
</div>
</section>
<section id="your-turn---exercise-2" class="slide level2">
<h2>Your Turn - Exercise 2</h2>
<ul>
<li><p>Continue with your code (or from XXX.R) and add a menu to choose different operators (e.g., plus, minus)</p></li>
<li><p>For example, add a <code>selectInput(inputId, label, choices)</code></p></li>
<li><p>Add server-side logic to implement the different operators</p></li>
</ul>
<p>##Reactive diagram</p>
<div class="cell" data-reveal="true">
<div class="cell-output-display">
<div>
<p>
</p><pre class="mermaid mermaid-js" data-tooltip-selector="#mermaid-tooltip-3">flowchart LR
subgraph outputs
re([result])
end
subgraph inputs
n1([number1])
n2([number2])
op([operator])
end
n1 --> re
n2 --> re
operator --> re
</pre>
<div id="mermaid-tooltip-3" class="mermaidTooltip">
</div>
<p></p>
</div>
</div>
</div>
</section>
<section id="solution" class="slide level2">
<h2>Solution</h2>
<div class="code-file sourceCode cell-code">
<p><svg aria-hidden="true" role="img" viewbox="0 0 384 512" style="height:1em;width:0.75em;vertical-align:-0.125em;margin-left:auto;margin-right:auto;font-size:inherit;fill:currentColor;overflow:visible;position:relative;"><path d="M0 64C0 28.65 28.65 0 64 0H229.5C246.5 0 262.7 6.743 274.7 18.75L365.3 109.3C377.3 121.3 384 137.5 384 154.5V448C384 483.3 355.3 512 320 512H64C28.65 512 0 483.3 0 448V64zM336 448V160H256C238.3 160 224 145.7 224 128V48H64C55.16 48 48 55.16 48 64V448C48 456.8 55.16 464 64 464H320C328.8 464 336 456.8 336 448z"></path></svg> <code>challenges/01-calculator/app-solution.R</code></p>
</div>
<div class="cell" data-file="challenges/01-calculator/app-solution.R">
<div class="sourceCode cell-code" id="cb7" data-code-line-numbers="|21-25|38-43"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1"></a><span class="co">#</span></span>
<span id="cb7-2"><a href="#cb7-2"></a><span class="co"># This is a Shiny web application. You can run the application by clicking</span></span>
<span id="cb7-3"><a href="#cb7-3"></a><span class="co"># the 'Run App' button above.</span></span>
<span id="cb7-4"><a href="#cb7-4"></a><span class="co">#</span></span>
<span id="cb7-5"><a href="#cb7-5"></a><span class="co"># Find out more about building applications with Shiny here:</span></span>
<span id="cb7-6"><a href="#cb7-6"></a><span class="co">#</span></span>
<span id="cb7-7"><a href="#cb7-7"></a><span class="co"># http://shiny.rstudio.com/</span></span>
<span id="cb7-8"><a href="#cb7-8"></a><span class="co">#</span></span>
<span id="cb7-9"><a href="#cb7-9"></a></span>
<span id="cb7-10"><a href="#cb7-10"></a><span class="fu">library</span>(shiny)</span>
<span id="cb7-11"><a href="#cb7-11"></a></span>
<span id="cb7-12"><a href="#cb7-12"></a><span class="co"># Define UI for application that draws a histogram</span></span>
<span id="cb7-13"><a href="#cb7-13"></a>ui <span class="ot"><-</span> <span class="fu">fluidPage</span>(</span>
<span id="cb7-14"><a href="#cb7-14"></a></span>
<span id="cb7-15"><a href="#cb7-15"></a> <span class="co"># Application title</span></span>
<span id="cb7-16"><a href="#cb7-16"></a> <span class="fu">titlePanel</span>(<span class="st">"Calculator"</span>),</span>
<span id="cb7-17"><a href="#cb7-17"></a></span>
<span id="cb7-18"><a href="#cb7-18"></a> <span class="co"># Sidebar with a slider input for number of bins </span></span>
<span id="cb7-19"><a href="#cb7-19"></a> <span class="fu">sidebarLayout</span>(</span>
<span id="cb7-20"><a href="#cb7-20"></a> <span class="fu">sidebarPanel</span>(</span>
<span id="cb7-21"><a href="#cb7-21"></a> <span class="fu">numericInput</span>(<span class="st">"n1"</span>,</span>
<span id="cb7-22"><a href="#cb7-22"></a> <span class="st">"Number"</span>, <span class="at">value=</span><span class="dv">0</span>),</span>
<span id="cb7-23"><a href="#cb7-23"></a> <span class="fu">numericInput</span>(<span class="st">"n2"</span>,</span>
<span id="cb7-24"><a href="#cb7-24"></a> <span class="st">"Number"</span>, <span class="at">value=</span><span class="dv">0</span>),</span>
<span id="cb7-25"><a href="#cb7-25"></a> <span class="fu">selectInput</span>(<span class="st">"operation"</span>,<span class="st">"Operator"</span>,<span class="fu">c</span>(<span class="st">"+"</span>,<span class="st">"-"</span>))</span>
<span id="cb7-26"><a href="#cb7-26"></a> ),</span>
<span id="cb7-27"><a href="#cb7-27"></a></span>
<span id="cb7-28"><a href="#cb7-28"></a> <span class="co"># Show a plot of the generated distribution</span></span>
<span id="cb7-29"><a href="#cb7-29"></a> <span class="fu">mainPanel</span>(</span>
<span id="cb7-30"><a href="#cb7-30"></a> <span class="fu">textOutput</span>(<span class="st">"result"</span>)</span>
<span id="cb7-31"><a href="#cb7-31"></a> )</span>
<span id="cb7-32"><a href="#cb7-32"></a> )</span>
<span id="cb7-33"><a href="#cb7-33"></a>)</span>
<span id="cb7-34"><a href="#cb7-34"></a></span>
<span id="cb7-35"><a href="#cb7-35"></a><span class="co"># Define server logic required to draw a histogram</span></span>
<span id="cb7-36"><a href="#cb7-36"></a>server <span class="ot"><-</span> <span class="cf">function</span>(input, output) {</span>
<span id="cb7-37"><a href="#cb7-37"></a></span>
<span id="cb7-38"><a href="#cb7-38"></a> output<span class="sc">$</span>result <span class="ot"><-</span> <span class="fu">renderText</span>({</span>
<span id="cb7-39"><a href="#cb7-39"></a> <span class="cf">if</span> (input<span class="sc">$</span>operation<span class="sc">==</span><span class="st">"+"</span>)</span>
<span id="cb7-40"><a href="#cb7-40"></a> <span class="fu">return</span>(input<span class="sc">$</span>n1<span class="sc">+</span>input<span class="sc">$</span>n2)</span>
<span id="cb7-41"><a href="#cb7-41"></a> <span class="cf">else</span></span>
<span id="cb7-42"><a href="#cb7-42"></a> <span class="fu">return</span>(input<span class="sc">$</span>n1<span class="sc">-</span>input<span class="sc">$</span>n2)</span>
<span id="cb7-43"><a href="#cb7-43"></a> })</span>
<span id="cb7-44"><a href="#cb7-44"></a>}</span>
<span id="cb7-45"><a href="#cb7-45"></a></span>
<span id="cb7-46"><a href="#cb7-46"></a><span class="co"># Run the application </span></span>
<span id="cb7-47"><a href="#cb7-47"></a><span class="fu">shinyApp</span>(<span class="at">ui =</span> ui, <span class="at">server =</span> server)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</section></section>
<section>
<section id="who-doesnt-like-penguins" class="title-slide slide level1 center">
<h1>Who doesn’t like penguins?</h1>
<p><img data-src="https://github.com/allisonhorst/palmerpenguins/raw/main/man/figures/lter_penguins.png"></p>
<aside><div>
<p>Artwork by @allison_horst</p>
</div></aside></section>
<section id="palmer-penguins" class="slide level2">
<h2>Palmer Penguins</h2>
<p>We are going to use the <code>penguins</code> dataset from <code>palmerpenguins</code></p>
<div class="cell">
<div class="cell-output-display">
<table>
<colgroup>
<col style="width: 8%">
<col style="width: 11%">
<col style="width: 16%">
<col style="width: 15%">
<col style="width: 20%">
<col style="width: 13%">
<col style="width: 7%">
<col style="width: 5%">
</colgroup>
<thead>
<tr class="header">
<th style="text-align: left;">species</th>
<th style="text-align: left;">island</th>
<th style="text-align: right;">bill_length_mm</th>
<th style="text-align: right;">bill_depth_mm</th>
<th style="text-align: right;">flipper_length_mm</th>
<th style="text-align: right;">body_mass_g</th>
<th style="text-align: left;">sex</th>
<th style="text-align: right;">year</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">39.1</td>
<td style="text-align: right;">18.7</td>
<td style="text-align: right;">181</td>
<td style="text-align: right;">3750</td>
<td style="text-align: left;">male</td>
<td style="text-align: right;">2007</td>
</tr>
<tr class="even">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">39.5</td>
<td style="text-align: right;">17.4</td>
<td style="text-align: right;">186</td>
<td style="text-align: right;">3800</td>
<td style="text-align: left;">female</td>
<td style="text-align: right;">2007</td>
</tr>
<tr class="odd">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">40.3</td>
<td style="text-align: right;">18.0</td>
<td style="text-align: right;">195</td>
<td style="text-align: right;">3250</td>
<td style="text-align: left;">female</td>
<td style="text-align: right;">2007</td>
</tr>
<tr class="even">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">NA</td>
<td style="text-align: right;">NA</td>
<td style="text-align: right;">NA</td>
<td style="text-align: right;">NA</td>
<td style="text-align: left;">NA</td>
<td style="text-align: right;">2007</td>
</tr>
<tr class="odd">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">36.7</td>
<td style="text-align: right;">19.3</td>
<td style="text-align: right;">193</td>
<td style="text-align: right;">3450</td>
<td style="text-align: left;">female</td>
<td style="text-align: right;">2007</td>
</tr>
<tr class="even">
<td style="text-align: left;">Adelie</td>
<td style="text-align: left;">Torgersen</td>
<td style="text-align: right;">39.3</td>
<td style="text-align: right;">20.6</td>
<td style="text-align: right;">190</td>
<td style="text-align: right;">3650</td>
<td style="text-align: left;">male</td>
<td style="text-align: right;">2007</td>
</tr>
</tbody>
</table>
</div>
</div>
</section>
<section id="reactive-expression" class="slide level2">
<h2>Reactive expression</h2>
<div class="code-file sourceCode cell-code">
<p><svg aria-hidden="true" role="img" viewbox="0 0 384 512" style="height:1em;width:0.75em;vertical-align:-0.125em;margin-left:auto;margin-right:auto;font-size:inherit;fill:currentColor;overflow:visible;position:relative;"><path d="M0 64C0 28.65 28.65 0 64 0H229.5C246.5 0 262.7 6.743 274.7 18.75L365.3 109.3C377.3 121.3 384 137.5 384 154.5V448C384 483.3 355.3 512 320 512H64C28.65 512 0 483.3 0 448V64zM336 448V160H256C238.3 160 224 145.7 224 128V48H64C55.16 48 48 55.16 48 64V448C48 456.8 55.16 464 64 464H320C328.8 464 336 456.8 336 448z"></path></svg> <code>demos/demo2.R</code></p>
</div>
<div class="code-half">
<div class="cell" data-file="demos/demo2.R">
<div class="sourceCode cell-code" id="cb8" data-code-line-numbers="|9|12-15|18-22|27-42|29-33|35-37|39-41"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1"></a><span class="fu">library</span>(shiny)</span>
<span id="cb8-2"><a href="#cb8-2"></a><span class="fu">library</span>(tidyverse)</span>
<span id="cb8-3"><a href="#cb8-3"></a><span class="fu">library</span>(palmerpenguins)</span>
<span id="cb8-4"><a href="#cb8-4"></a></span>
<span id="cb8-5"><a href="#cb8-5"></a><span class="co"># Define UI for application that draws a histogram</span></span>
<span id="cb8-6"><a href="#cb8-6"></a>ui <span class="ot"><-</span> <span class="fu">fluidPage</span>(</span>
<span id="cb8-7"><a href="#cb8-7"></a></span>
<span id="cb8-8"><a href="#cb8-8"></a> <span class="co"># Application title</span></span>
<span id="cb8-9"><a href="#cb8-9"></a> <span class="fu">titlePanel</span>(<span class="st">"Penguins"</span>),</span>
<span id="cb8-10"><a href="#cb8-10"></a></span>
<span id="cb8-11"><a href="#cb8-11"></a> <span class="co"># Sidebar with a slider input for number of bins </span></span>
<span id="cb8-12"><a href="#cb8-12"></a> <span class="fu">sidebarLayout</span>(</span>
<span id="cb8-13"><a href="#cb8-13"></a> <span class="fu">sidebarPanel</span>(</span>
<span id="cb8-14"><a href="#cb8-14"></a> <span class="co"># <------- here go input elements</span></span>
<span id="cb8-15"><a href="#cb8-15"></a> ),</span>
<span id="cb8-16"><a href="#cb8-16"></a></span>
<span id="cb8-17"><a href="#cb8-17"></a> <span class="co"># Show a plot of the generated distribution</span></span>
<span id="cb8-18"><a href="#cb8-18"></a> <span class="fu">mainPanel</span>(</span>
<span id="cb8-19"><a href="#cb8-19"></a> <span class="fu">plotOutput</span>(<span class="st">"plot1"</span>),</span>
<span id="cb8-20"><a href="#cb8-20"></a> <span class="fu">plotOutput</span>(<span class="st">"plot2"</span>),</span>
<span id="cb8-21"><a href="#cb8-21"></a> <span class="fu">textOutput</span>(<span class="st">"text1"</span>)</span>
<span id="cb8-22"><a href="#cb8-22"></a> )</span>
<span id="cb8-23"><a href="#cb8-23"></a> )</span>
<span id="cb8-24"><a href="#cb8-24"></a>)</span>
<span id="cb8-25"><a href="#cb8-25"></a></span>
<span id="cb8-26"><a href="#cb8-26"></a><span class="co"># Define server logic required to draw a histogram</span></span>
<span id="cb8-27"><a href="#cb8-27"></a>server <span class="ot"><-</span> <span class="cf">function</span>(input, output) {</span>
<span id="cb8-28"><a href="#cb8-28"></a></span>
<span id="cb8-29"><a href="#cb8-29"></a> output<span class="sc">$</span>plot1 <span class="ot"><-</span> <span class="fu">renderPlot</span>({</span>
<span id="cb8-30"><a href="#cb8-30"></a> penguins <span class="sc">%>%</span> <span class="fu">ggplot</span>(<span class="fu">aes</span>(<span class="at">x=</span>body_mass_g,<span class="at">y=</span>bill_length_mm))<span class="sc">+</span></span>
<span id="cb8-31"><a href="#cb8-31"></a> <span class="fu">geom_point</span>()<span class="sc">+</span></span>
<span id="cb8-32"><a href="#cb8-32"></a> <span class="fu">geom_smooth</span>(<span class="at">method =</span> <span class="st">"lm"</span>)</span>
<span id="cb8-33"><a href="#cb8-33"></a> })</span>
<span id="cb8-34"><a href="#cb8-34"></a> </span>
<span id="cb8-35"><a href="#cb8-35"></a> output<span class="sc">$</span>plot2 <span class="ot"><-</span> <span class="fu">renderPlot</span>({</span>
<span id="cb8-36"><a href="#cb8-36"></a> penguins <span class="sc">%>%</span> <span class="fu">ggplot</span>(<span class="fu">aes</span>(<span class="at">x=</span>flipper_length_mm))<span class="sc">+</span><span class="fu">geom_histogram</span>()</span>
<span id="cb8-37"><a href="#cb8-37"></a> })</span>
<span id="cb8-38"><a href="#cb8-38"></a> </span>
<span id="cb8-39"><a href="#cb8-39"></a> output<span class="sc">$</span>text1 <span class="ot"><-</span> <span class="fu">renderText</span>({</span>
<span id="cb8-40"><a href="#cb8-40"></a> <span class="fu">paste0</span>(<span class="st">"There are "</span>,<span class="fu">nrow</span>(penguins), <span class="st">" penguins in the data set"</span>)</span>
<span id="cb8-41"><a href="#cb8-41"></a> })</span>
<span id="cb8-42"><a href="#cb8-42"></a>}</span>
<span id="cb8-43"><a href="#cb8-43"></a></span>
<span id="cb8-44"><a href="#cb8-44"></a><span class="co"># Run the application </span></span>
<span id="cb8-45"><a href="#cb8-45"></a><span class="fu">shinyApp</span>(<span class="at">ui =</span> ui, <span class="at">server =</span> server)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
</section>
<section id="reactive-diagram-1" class="slide level2">
<h2>Reactive diagram</h2>
<div class="cell" data-reveal="true">
<div class="cell-output-display">
<div>
<p>
</p><pre class="mermaid mermaid-js" data-tooltip-selector="#mermaid-tooltip-4">flowchart LR
subgraph outputs
pl1([plot1])
pl2([plot2])
tx1([text1])
end
subgraph inputs
slider1([slider1])
n1([number1])
rn1([range1])
ck1([ck1])
end
</pre>