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POCan't find documentation for R function row_sums and col_sums
 

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  1. POCan't find documentation for R function row_sums and col_sums
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    <p>I am trying to resolve my own question regarding changing the tf-idf weighting function in the <code>tm</code> package: <a href="https://stackoverflow.com/questions/15045313/changing-tf-idf-weight-function-weight-not-by-occurrences-of-term-but-by-numbe">https://stackoverflow.com/questions/15045313/changing-tf-idf-weight-function-weight-not-by-occurrences-of-term-but-by-numbe</a></p> <p>In doing so, I'm looking at the <code>weightTfIdf</code> function which includes the following code on <code>m</code>, a TermDocumentMatrix.</p> <pre><code>cs &lt;- col_sums(m) </code></pre> <p>and</p> <pre><code>rs &lt;- row_sums(m) </code></pre> <p>But I can't find any documentation for the functions <code>row_sums</code> or <code>col_sums</code>; and when I try to write my own weighting function using them, I get an error: <code>Error in weighting(x) : could not find function "col_sums"</code></p> <p>Where are these functions defined? </p> <p>I've pasted the complete function information from <code>R</code> below:</p> <pre><code>function (m, normalize = TRUE) { isDTM &lt;- inherits(m, "DocumentTermMatrix") if (isDTM) m &lt;- t(m) if (normalize) { cs &lt;- col_sums(m) if (any(cs == 0)) warning("empty document(s): ", paste(Docs(m)[cs == 0], collapse = " ")) names(cs) &lt;- seq_len(nDocs(m)) m$v &lt;- m$v/cs[m$j] } rs &lt;- row_sums(m &gt; 0) if (any(rs == 0)) warning("unreferenced term(s): ", paste(Terms(m)[rs == 0], collapse = " ")) lnrs &lt;- log2(nDocs(m)/rs) lnrs[!is.finite(lnrs)] &lt;- 0 m &lt;- m * lnrs attr(m, "Weighting") &lt;- c(sprintf("%s%s", "term frequency - inverse document frequency", if (normalize) " (normalized)" else ""), "tf-idf") if (isDTM) t(m) else m } &lt;environment: namespace:tm&gt; attr(,"class") [1] "WeightFunction" "function" attr(,"Name") [1] "term frequency - inverse document frequency" attr(,"Acronym") [1] "tf-idf" </code></pre>
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