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<!DOCTYPE html>
<!-- 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>Using Positional Attributes. — CL: p_attributes • RcppCWB</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="Using Positional Attributes. — CL: p_attributes"><meta property="og:description" content="CWB indexed corpora store the text of a corpus as numbers: Every token
in the token stream of the corpus is identified by a unique corpus
position. The string value of every token is identified by a unique integer
id. The corpus library (CL) offers a set of functions to make the transitions
between corpus positions, token ids, and the character string of tokens."><!-- mathjax --><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-84DKXVJXs0/F8OTMzX4UR909+jtl4G7SPypPavF+GfA=" crossorigin="anonymous"></script><!--[if lt IE 9]>
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<h1>Using Positional Attributes.</h1>
<small class="dont-index">Source: <a href="https://github.com/PolMine/RcppCWB/blob/HEAD/R/cl.R" class="external-link"><code>R/cl.R</code></a></small>
<div class="hidden name"><code>p_attributes.Rd</code></div>
</div>
<div class="ref-description">
<p>CWB indexed corpora store the text of a corpus as numbers: Every token
in the token stream of the corpus is identified by a unique corpus
position. The string value of every token is identified by a unique integer
id. The corpus library (CL) offers a set of functions to make the transitions
between corpus positions, token ids, and the character string of tokens.</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">cl_cpos2str</span><span class="op">(</span></span>
<span> <span class="va">corpus</span>,</span>
<span> <span class="va">p_attribute</span>,</span>
<span> registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span>,</span>
<span> <span class="va">cpos</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_cpos2id</span><span class="op">(</span><span class="va">corpus</span>, <span class="va">p_attribute</span>, registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span>, <span class="va">cpos</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_id2str</span><span class="op">(</span><span class="va">corpus</span>, <span class="va">p_attribute</span>, registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span>, <span class="va">id</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_regex2id</span><span class="op">(</span></span>
<span> <span class="va">corpus</span>,</span>
<span> <span class="va">p_attribute</span>,</span>
<span> <span class="va">regex</span>,</span>
<span> registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span></span>
<span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_str2id</span><span class="op">(</span><span class="va">corpus</span>, <span class="va">p_attribute</span>, <span class="va">str</span>, registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_id2freq</span><span class="op">(</span><span class="va">corpus</span>, <span class="va">p_attribute</span>, <span class="va">id</span>, registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span><span class="op">)</span></span>
<span></span>
<span><span class="fu">cl_id2cpos</span><span class="op">(</span><span class="va">corpus</span>, <span class="va">p_attribute</span>, <span class="va">id</span>, registry <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/Sys.getenv.html" class="external-link">Sys.getenv</a></span><span class="op">(</span><span class="st">"CORPUS_REGISTRY"</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
</div>
<div id="arguments">
<h2>Arguments</h2>
<dl><dt>corpus</dt>
<dd><p>name of a CWB corpus (upper case)</p></dd>
<dt>p_attribute</dt>
<dd><p>a p-attribute (positional attribute)</p></dd>
<dt>registry</dt>
<dd><p>path to the registry directory, defaults to the value of the
environment variable CORPUS_REGISTRY</p></dd>
<dt>cpos</dt>
<dd><p>corpus positions (integer vector)</p></dd>
<dt>id</dt>
<dd><p>id of a token</p></dd>
<dt>regex</dt>
<dd><p>a regular expression</p></dd>
<dt>str</dt>
<dd><p>a character string</p></dd>
</dl></div>
<div id="ref-examples">
<h2>Examples</h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># registry directory and cpos_total will be needed in examples</span></span></span>
<span class="r-in"><span><span class="va">cpos_total</span> <span class="op"><-</span> <span class="fu"><a href="cl_attribute_size.html">cl_attribute_size</a></span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> attribute_type <span class="op">=</span> <span class="st">"p"</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># decode the token stream of the corpus (the quick way)</span></span></span>
<span class="r-in"><span><span class="va">token_stream_str</span> <span class="op"><-</span> <span class="fu">cl_cpos2str</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> cpos <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/seq.html" class="external-link">seq.int</a></span><span class="op">(</span>from <span class="op">=</span> <span class="fl">0</span>, to <span class="op">=</span> <span class="va">cpos_total</span> <span class="op">-</span> <span class="fl">1</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span></span></span>
<span class="r-in"><span> </span></span>
<span class="r-in"><span><span class="co"># decode the token stream (cpos2id first, then id2str)</span></span></span>
<span class="r-in"><span><span class="va">token_stream_ids</span> <span class="op"><-</span> <span class="fu">cl_cpos2id</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> cpos <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/seq.html" class="external-link">seq.int</a></span><span class="op">(</span>from <span class="op">=</span> <span class="fl">0</span>, to <span class="op">=</span> <span class="va">cpos_total</span> <span class="op">-</span> <span class="fl">1</span><span class="op">)</span>,</span></span>
<span class="r-in"><span> registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">token_stream_str</span> <span class="op"><-</span> <span class="fu">cl_id2str</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> id <span class="op">=</span> <span class="va">token_stream_ids</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># get corpus positions of a token</span></span></span>
<span class="r-in"><span><span class="va">token_to_get</span> <span class="op"><-</span> <span class="st">"oil"</span></span></span>
<span class="r-in"><span><span class="va">id_oil</span> <span class="op"><-</span> <span class="fu">cl_str2id</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> str <span class="op">=</span> <span class="va">token_to_get</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span> <span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">cpos_oil</span> <span class="op"><-</span> <span class="va">cl_id2cpos</span> <span class="op"><-</span> <span class="fu">cl_id2cpos</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> id <span class="op">=</span> <span class="va">id_oil</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># get frequency of token</span></span></span>
<span class="r-in"><span><span class="va">oil_freq</span> <span class="op"><-</span> <span class="fu">cl_id2freq</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>, id <span class="op">=</span> <span class="va">id_oil</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/length.html" class="external-link">length</a></span><span class="op">(</span><span class="va">cpos_oil</span><span class="op">)</span> <span class="co"># needs to be the same as oil_freq</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] 78</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># use regular expressions </span></span></span>
<span class="r-in"><span><span class="va">ids</span> <span class="op"><-</span> <span class="fu">cl_regex2id</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> regex <span class="op">=</span> <span class="st">"M.*"</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">m_words</span> <span class="op"><-</span> <span class="fu">cl_id2str</span><span class="op">(</span></span></span>
<span class="r-in"><span> corpus <span class="op">=</span> <span class="st">"REUTERS"</span>, p_attribute <span class="op">=</span> <span class="st">"word"</span>,</span></span>
<span class="r-in"><span> id <span class="op">=</span> <span class="va">ids</span>, registry <span class="op">=</span> <span class="fu"><a href="tmp_registry.html">get_tmp_registry</a></span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
</code></pre></div>
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