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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>Average spectra in list-column by entries in grouping column — average_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="Average spectra in list-column by entries in grouping column — average_spc"><meta property="og:description" content="Average spectra in list-column of spectra tibble (spc_tbl) by
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<h1>Average spectra in list-column by entries in grouping column</h1>
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<small class="dont-index">Source: <a href="https://github.com/philipp-baumann/simplerspec/blob/HEAD/R/average-spc.R" class="external-link"><code>R/average-spc.R</code></a></small>
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<div class="hidden name"><code>average_spc.Rd</code></div>
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<div class="ref-description">
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<p>Average spectra in list-column of spectra tibble (<code>spc_tbl</code>) by
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groups given in group column.</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">average_spc</span><span class="op">(</span><span class="va">spc_tbl</span>, by <span class="op">=</span> <span class="st">"sample_id"</span>, column_in <span class="op">=</span> <span class="st">"spc_rs"</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 data frame containing at least the grouping column
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given in argument <code>by</code> and input spectra given in list-column <code>column_in</code>.</p></dd>
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<dt>by</dt>
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<dd><p>Character vector of length 1L or name/symbol that specifies the
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column by which groups of spectra are averaged. Default is <code>"sample_id"</code>.</p></dd>
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<dt>column_in</dt>
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<dd><p>Character vector of length 1L or or name/symbol that
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specifies the list-column that contains the inputs spectra to be averaged.
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Default is <code>"spc_rs"</code>, which are resampled spectra (i.e., resulting after
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preceding <code><a href="resample_spc.html">resample_spc()</a></code> step).</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>Spectra tibble data frame (class <code>"tbl_df"</code>, <code>"tbl"</code>, <code>"data.frame"</code>)
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with a new list-column of column name <code>"spc_mean"</code> at the last position,
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containing mean spectra with identical row replicates within the same
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<code>by</code>-group.</p>
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</div>
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<div id="details">
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<h2>Details</h2>
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<p>For memory efficiency and subsequent modeling, consider slicing the
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extra row copies of <code>spc_mean</code> resulting from <code>average_spc()</code> for example by</p><ul><li><p><code>split(x = spc_tbl, f = spc_tbl$<by>) %>% lapply(., function(x) x x[1, ]) %>% do.call(., rbind)</code></p></li>
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<li><p><code>dplyr::group_by(spc_tbl, <by>) %>% dplyr::slice(1L)</code></p></li>
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</ul></div>
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