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<span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="">1.7.5.1</span>
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<h1>Make a random number generator repeatable</h1>
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<small class="dont-index">Source: <a href="https://github.com/rstudio/shiny/blob/HEAD/R/utils.R" class="external-link"><code>R/utils.R</code></a></small>
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<div class="hidden name"><code>repeatable.Rd</code></div>
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</div>
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<div class="ref-description">
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<p>Given a function that generates random data, returns a wrapped version of
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that function that always uses the same seed when called. The seed to use can
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be passed in explicitly if desired; otherwise, a random number is used.</p>
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</div>
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<div id="ref-usage">
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<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">repeatable</span><span class="op">(</span><span class="va">rngfunc</span>, seed <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/Uniform.html" class="external-link">runif</a></span><span class="op">(</span><span class="fl">1</span>, <span class="fl">0</span>, <span class="va">.Machine</span><span class="op">$</span><span class="va">integer.max</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
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</div>
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<div id="arguments">
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<h2>Arguments</h2>
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<dl><dt>rngfunc</dt>
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<dd><p>The function that is affected by the R session's seed.</p></dd>
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<dt>seed</dt>
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<dd><p>The seed to set every time the resulting function is called.</p></dd>
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</dl></div>
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<div id="value">
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<h2>Value</h2>
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<p>A repeatable version of the function that was passed in.</p>
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</div>
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<div id="note">
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<h2>Note</h2>
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<p>When called, the returned function attempts to preserve the R session's
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current seed by snapshotting and restoring
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<code><a href="https://rdrr.io/r/base/Random.html" class="external-link">base::.Random.seed()</a></code>.</p>
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</div>
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<div id="ref-examples">
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<h2>Examples</h2>
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<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">rnormA</span> <span class="op"><-</span> <span class="fu">repeatable</span><span class="op">(</span><span class="va">rnorm</span><span class="op">)</span></span></span>
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<span class="r-in"><span><span class="va">rnormB</span> <span class="op"><-</span> <span class="fu">repeatable</span><span class="op">(</span><span class="va">rnorm</span><span class="op">)</span></span></span>
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<span class="r-in"><span><span class="fu">rnormA</span><span class="op">(</span><span class="fl">3</span><span class="op">)</span> <span class="co"># [1] 1.8285879 -0.7468041 -0.4639111</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> [1] -0.4855549 -0.9036950 0.8078139</span>
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<span class="r-in"><span><span class="fu">rnormA</span><span class="op">(</span><span class="fl">3</span><span class="op">)</span> <span class="co"># [1] 1.8285879 -0.7468041 -0.4639111</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> [1] -0.4855549 -0.9036950 0.8078139</span>
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<span class="r-in"><span><span class="fu">rnormA</span><span class="op">(</span><span class="fl">5</span><span class="op">)</span> <span class="co"># [1] 1.8285879 -0.7468041 -0.4639111 -1.6510126 -1.4686924</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> [1] -0.48555493 -0.90369499 0.80781390 0.51643685 -0.09253551</span>
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<span class="r-in"><span><span class="fu">rnormB</span><span class="op">(</span><span class="fl">5</span><span class="op">)</span> <span class="co"># [1] -0.7946034 0.2568374 -0.6567597 1.2451387 -0.8375699</span></span></span>
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<span class="r-out co"><span class="r-pr">#></span> [1] 0.07289016 -3.41457030 -0.14712858 1.36089723 0.34018307</span>
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</code></pre></div>
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<p></p><p>Developed by Winston Chang, Joe Cheng, JJ Allaire, Carson Sievert, Barret Schloerke, Yihui Xie, Jeff Allen, Jonathan McPherson, Alan Dipert, Barbara Borges, Posit Software, PBC.</p>
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