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<!DOCTYPE html>
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<meta name="generator" content="bookdown 0.1.16 and GitBook 2.6.7">
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<meta property="og:type" content="book" />
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<nav role="navigation">
<ul class="summary">
<li><a href="./">Statistical Programming Methods</a></li>
<li class="divider"></li>
<li class="chapter" data-level="1" data-path="shiny.html"><a href="shiny.html"><i class="fa fa-check"></i><b>1</b> Shiny</a><ul>
<li class="chapter" data-level="1.1" data-path="shiny.html"><a href="shiny.html#introduction"><i class="fa fa-check"></i><b>1.1</b> Introduction</a></li>
<li class="chapter" data-level="1.2" data-path="shiny.html"><a href="shiny.html#step-1.-r-code-server-backend"><i class="fa fa-check"></i><b>1.2</b> Step 1. R Code / Server / Backend</a></li>
<li class="chapter" data-level="1.3" data-path="shiny.html"><a href="shiny.html#step-2-user-interface-ui-frontend"><i class="fa fa-check"></i><b>1.3</b> Step 2: User Interface (UI) / Frontend</a><ul>
<li class="chapter" data-level="" data-path="shiny.html"><a href="shiny.html#content-creation"><i class="fa fa-check"></i>Content Creation</a></li>
<li class="chapter" data-level="" data-path="shiny.html"><a href="shiny.html#input-controls"><i class="fa fa-check"></i>Input Controls</a></li>
<li class="chapter" data-level="" data-path="shiny.html"><a href="shiny.html#output-render-controls"><i class="fa fa-check"></i>Output Render Controls</a></li>
</ul></li>
<li class="chapter" data-level="1.4" data-path="shiny.html"><a href="shiny.html#step-3-connecting-frontend-and-backend"><i class="fa fa-check"></i><b>1.4</b> Step 3: Connecting frontend and backend</a></li>
<li class="chapter" data-level="1.5" data-path="shiny.html"><a href="shiny.html#step-4-customize"><i class="fa fa-check"></i><b>1.5</b> Step 4: Customize</a></li>
<li class="chapter" data-level="1.6" data-path="shiny.html"><a href="shiny.html#example-monte-carlo-integration"><i class="fa fa-check"></i><b>1.6</b> Example: Monte-Carlo Integration</a></li>
<li class="chapter" data-level="1.7" data-path="shiny.html"><a href="shiny.html#example-buffons-needle"><i class="fa fa-check"></i><b>1.7</b> Example: Buffon’s needle</a><ul>
<li class="chapter" data-level="1.7.1" data-path="shiny.html"><a href="shiny.html#step-1-backend"><i class="fa fa-check"></i><b>1.7.1</b> Step 1: Backend</a></li>
<li class="chapter" data-level="1.7.2" data-path="shiny.html"><a href="shiny.html#step-2-frontend"><i class="fa fa-check"></i><b>1.7.2</b> Step 2: Frontend</a></li>
<li class="chapter" data-level="1.7.3" data-path="shiny.html"><a href="shiny.html#step-3-connecting-frontend-and-backend-1"><i class="fa fa-check"></i><b>1.7.3</b> Step 3: Connecting frontend and backend</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="2" data-path="niakette.html"><a href="niakette.html"><i class="fa fa-check"></i><b>2</b> NIAKETTE</a></li>
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<li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li>
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<div id="niakette" class="section level1">
<h1><span class="header-section-number">Chapter 2</span> NIAKETTE</h1>
<p>and when reloading the app you should now see on the second tab:</p>
<center>
<img src="images/shiny_server_part2.png" />
</center>
<p>Our next step to update the seed everything the “action” button is pushed. To do so, we will first need to add an additional input to the <code>server</code> function called <code>session</code> which will allow us to <strong>dynmically</strong> update the input direct from the <code>server</code> function. This can be done as follows where everytime the user click on the “action” button a new seed is randomly generated:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r"><span class="kw">observeEvent</span>(input$cast,{
<span class="kw">updateNumericInput</span>(session, <span class="st">"seed"</span>,
<span class="dt">value =</span> <span class="kw">round</span>(<span class="kw">runif</span>(<span class="dv">1</span>, <span class="dv">1</span>, <span class="dv">10</span>^<span class="dv">4</span>)))
})</code></pre></div>
<p>Therefore, your final <code>server</code> function is now:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r">server <-<span class="st"> </span>function(input, output, session) {
<span class="kw">observeEvent</span>(input$cast,{
<span class="kw">updateNumericInput</span>(session, <span class="st">"seed"</span>,
<span class="dt">value =</span> <span class="kw">round</span>(<span class="kw">runif</span>(<span class="dv">1</span>, <span class="dv">1</span>, <span class="dv">10</span>^<span class="dv">4</span>)))
})
<span class="co"># Fling some needles!</span>
cast =<span class="st"> </span><span class="kw">eventReactive</span>(input$cast, {
<span class="kw">buffon_experiment</span>(<span class="dt">B =</span> input$B, <span class="dt">plane_width =</span> input$plane,
<span class="dt">seed =</span> input$seed)
})
conv =<span class="st"> </span><span class="kw">eventReactive</span>(input$cast, {
<span class="kw">converge</span>(<span class="dt">B =</span> input$B, <span class="dt">plane_width =</span> input$plane,
<span class="dt">seed =</span> input$seed, <span class="dt">M =</span> input$M)
})
output$exp <-<span class="st"> </span><span class="kw">renderPlot</span>({
<span class="kw">plot</span>(<span class="kw">cast</span>())
}, <span class="dt">height =</span> <span class="dv">620</span>)
output$conv <-<span class="st"> </span><span class="kw">renderPlot</span>({
<span class="kw">conv</span>()
}, <span class="dt">height =</span> <span class="dv">620</span>)
}</code></pre></div>
<p><<<<<<< HEAD</p>
<p>======= >>>>>>> a878320e8e8c3d312930241b9a93d29e085f02f0 and you will now see that the seed is now updated every time the “action” button is clicked on. The final version of the app we have just made can be found <a href="http://shiny.science.psu.edu/szg279/buffon/">here</a>.</p>
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