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<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Preprocess spectra — preprocess_spc • simplerspec</title><!-- jquery --><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script><!-- Bootstrap --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha256-bZLfwXAP04zRMK2BjiO8iu9pf4FbLqX6zitd+tIvLhE=" crossorigin="anonymous"><script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha256-nuL8/2cJ5NDSSwnKD8VqreErSWHtnEP9E7AySL+1ev4=" crossorigin="anonymous"></script><!-- bootstrap-toc --><link rel="stylesheet" href="../bootstrap-toc.css"><script src="../bootstrap-toc.js"></script><!-- Font Awesome icons --><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/v4-shims.min.css" integrity="sha256-wZjR52fzng1pJHwx4aV2AO3yyTOXrcDW7jBpJtTwVxw=" crossorigin="anonymous"><!-- clipboard.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.6/clipboard.min.js" integrity="sha256-inc5kl9MA1hkeYUt+EC3BhlIgyp/2jDIyBLS6k3UxPI=" crossorigin="anonymous"></script><!-- headroom.js --><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/headroom.min.js" integrity="sha256-AsUX4SJE1+yuDu5+mAVzJbuYNPHj/WroHuZ8Ir/CkE0=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script><!-- pkgdown --><link href="../pkgdown.css" rel="stylesheet"><script src="../pkgdown.js"></script><meta property="og:title" content="Preprocess spectra — preprocess_spc"><meta property="og:description" content="Preprocesses spectra in tibble column by sample_id after
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<h1>Preprocess spectra</h1>
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<small class="dont-index">Source: <a href="https://github.com/philipp-baumann/simplerspec/blob/HEAD/R/preprocess-spc.R" class="external-link"><code>R/preprocess-spc.R</code></a></small>
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<div class="hidden name"><code>preprocess_spc.Rd</code></div>
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<div class="ref-description">
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<p>Preprocesses spectra in tibble column by sample_id after
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averaging spectra by <code><a href="average_spc.html">simplerspec::average_spc()</a></code>.</p>
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<div id="ref-usage">
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<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">preprocess_spc</span><span class="op">(</span><span class="va">spc_tbl</span>, <span class="va">select</span>, column_in <span class="op">=</span> <span class="st">"spc_mean"</span>, custom_function <span class="op">=</span> <span class="cn">NULL</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>spc_tbl</dt>
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<dd><p>Tibble that contains spectra to be preprocessed within
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a list-column.</p></dd>
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<dt>select</dt>
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<dd><p>Character vector of predefined preprocessing options to be
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applied to the spectra list-column specified in <code>column_in</code>.
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Common prefined values are stated as abbreviated preprocessing methods and
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options such as <code>"sg_1_w21"</code>, where <code>"sg"</code> stands for
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Savitzky-Golay and <code>1</code> for first derivative and <code>"w21"</code>
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for a window size of 21 points.</p></dd>
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<dt>column_in</dt>
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<dd><p>Character vector of single list-column in <code>spc_tbl</code> that
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contain list of spectra (1 row matrix) to be processed by function supplied
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in <code>select</code>.</p></dd>
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<dt>custom_function</dt>
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<dd><p>A character string of a custom processing function
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that is later parsed (produces expression in a list) and evaluated within
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the function <code>preprocess_spc</code>.
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The character vector argument of <code>custom_function</code>
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needs to contain <code>"spc_raw"</code>, which is the single data table of spectra
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that results from binding a list of data.tables (spectra to preprocess)
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from the spectra list-column specified in <code>column_in</code>.
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An example for a value is
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<code>"prospectr::savitzkyGolay(X = spc_raw, m = 0, p = 3, w = 9)"</code>.
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Optional argument. Default is <code>NULL</code>.</p></dd>
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