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Edit File: count_fields.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Count the number of fields in each line of a file</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for count_fields {readr}"><tr><td>count_fields {readr}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Count the number of fields in each line of a file</h2> <h3>Description</h3> <p>This is useful for diagnosing problems with functions that fail to parse correctly. </p> <h3>Usage</h3> <pre> count_fields(file, tokenizer, skip = 0, n_max = -1L) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>file</code></td> <td> <p>Either a path to a file, a connection, or literal data (either a single string or a raw vector). </p> <p>Files ending in <code>.gz</code>, <code>.bz2</code>, <code>.xz</code>, or <code>.zip</code> will be automatically uncompressed. Files starting with <code>http://</code>, <code>https://</code>, <code>ftp://</code>, or <code>ftps://</code> will be automatically downloaded. Remote gz files can also be automatically downloaded and decompressed. </p> <p>Literal data is most useful for examples and tests. It must contain at least one new line to be recognised as data (instead of a path) or be a vector of greater than length 1. </p> <p>Using a value of <code><a href="clipboard.html">clipboard()</a></code> will read from the system clipboard.</p> </td></tr> <tr valign="top"><td><code>tokenizer</code></td> <td> <p>A tokenizer that specifies how to break the <code>file</code> up into fields, e.g., <code><a href="Tokenizers.html">tokenizer_csv()</a></code>, <code><a href="Tokenizers.html">tokenizer_fwf()</a></code></p> </td></tr> <tr valign="top"><td><code>skip</code></td> <td> <p>Number of lines to skip before reading data.</p> </td></tr> <tr valign="top"><td><code>n_max</code></td> <td> <p>Optionally, maximum number of rows to count fields for.</p> </td></tr> </table> <h3>Examples</h3> <pre> count_fields(readr_example("mtcars.csv"), tokenizer_csv()) </pre> <hr /><div style="text-align: center;">[Package <em>readr</em> version 1.3.1 <a href="00Index.html">Index</a>]</div> </body></html>