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<h1>Using Positional Attributes.</h1>
<small class="dont-index">Source: <a href='https://github.com/PolMine/RcppCWB/blob/master/R/cl.R'><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>
<pre class="usage"><span class='fu'>cl_cpos2str</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>,
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>), <span class='no'>cpos</span>)
<span class='fu'>cl_cpos2id</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>),
<span class='no'>cpos</span>)
<span class='fu'>cl_id2str</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>),
<span class='no'>id</span>)
<span class='fu'>cl_regex2id</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='no'>regex</span>,
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>))
<span class='fu'>cl_str2id</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='no'>str</span>,
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>))
<span class='fu'>cl_id2freq</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='no'>id</span>,
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>))
<span class='fu'>cl_id2cpos</span>(<span class='no'>corpus</span>, <span class='no'>p_attribute</span>, <span class='no'>id</span>,
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/Sys.getenv.html'>Sys.getenv</a></span>(<span class='st'>"CORPUS_REGISTRY"</span>))</pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>corpus</th>
<td><p>name of a CWB corpus (upper case)</p></td>
</tr>
<tr>
<th>p_attribute</th>
<td><p>a p-attribute (positional attribute)</p></td>
</tr>
<tr>
<th>registry</th>
<td><p>path to the registry directory, defaults to the value of the
environment variable CORPUS_REGISTRY</p></td>
</tr>
<tr>
<th>cpos</th>
<td><p>corpus positions (integer vector)</p></td>
</tr>
<tr>
<th>id</th>
<td><p>id of a token</p></td>
</tr>
<tr>
<th>regex</th>
<td><p>a regular expression</p></td>
</tr>
<tr>
<th>str</th>
<td><p>a character string</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'><span class='co'># registry directory and cpos_total will be needed in examples</span>
<span class='no'>registry</span> <span class='kw'><-</span> <span class='kw'>if</span> (!<span class='fu'><a href='check_pkg_registry_files.html'>check_pkg_registry_files</a></span>()) <span class='fu'><a href='tmp_registry.html'>use_tmp_registry</a></span>() <span class='kw'>else</span> <span class='fu'><a href='get_pkg_registry.html'>get_pkg_registry</a></span>()
<span class='fu'><a href='https://rdrr.io/r/base/Sys.setenv.html'>Sys.setenv</a></span>(<span class='kw'>CORPUS_REGISTRY</span> <span class='kw'>=</span> <span class='no'>registry</span>)
<span class='no'>cpos_total</span> <span class='kw'><-</span> <span class='fu'><a href='cl_attribute_size.html'>cl_attribute_size</a></span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>attribute_type</span> <span class='kw'>=</span> <span class='st'>"p"</span>, <span class='kw'>registry</span> <span class='kw'>=</span> <span class='no'>registry</span>
)
<span class='co'># decode the token stream of the corpus (the quick way)</span>
<span class='no'>token_stream_str</span> <span class='kw'><-</span> <span class='fu'>cl_cpos2str</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>cpos</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq.int</a></span>(<span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='no'>cpos_total</span> - <span class='fl'>1</span>),
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='no'>registry</span>
)
<span class='co'># decode the token stream (cpos2id first, then id2str)</span>
<span class='no'>token_stream_ids</span> <span class='kw'><-</span> <span class='fu'>cl_cpos2id</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>cpos</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq.int</a></span>(<span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='no'>cpos_total</span> - <span class='fl'>1</span>),
<span class='kw'>registry</span> <span class='kw'>=</span> <span class='no'>registry</span>
)
<span class='no'>token_stream_str</span> <span class='kw'><-</span> <span class='fu'>cl_id2str</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>id</span> <span class='kw'>=</span> <span class='no'>token_stream_ids</span>, <span class='kw'>registry</span> <span class='kw'>=</span> <span class='no'>registry</span>
)
<span class='co'># get corpus positions of a token</span>
<span class='no'>token_to_get</span> <span class='kw'><-</span> <span class='st'>"oil"</span>
<span class='no'>id_oil</span> <span class='kw'><-</span> <span class='fu'>cl_str2id</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>str</span> <span class='kw'>=</span> <span class='no'>token_to_get</span>
)
<span class='no'>cpos_oil</span> <span class='kw'><-</span> <span class='no'>cl_id2cpos</span> <span class='kw'><-</span> <span class='fu'>cl_id2cpos</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>id</span> <span class='kw'>=</span> <span class='no'>id_oil</span>
)
<span class='co'># get frequency of token</span>
<span class='no'>oil_freq</span> <span class='kw'><-</span> <span class='fu'>cl_id2freq</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>, <span class='kw'>id</span> <span class='kw'>=</span> <span class='no'>id_oil</span>
)
<span class='fu'><a href='https://rdrr.io/r/base/length.html'>length</a></span>(<span class='no'>cpos_oil</span>) <span class='co'># needs to be the same as oil_freq</span></div><div class='output co'>#> [1] 78</div><div class='input'>
<span class='co'># use regular expressions </span>
<span class='no'>ids</span> <span class='kw'><-</span> <span class='fu'>cl_regex2id</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>regex</span> <span class='kw'>=</span> <span class='st'>"M.*"</span>
)
<span class='no'>m_words</span> <span class='kw'><-</span> <span class='fu'>cl_id2str</span>(
<span class='kw'>corpus</span> <span class='kw'>=</span> <span class='st'>"REUTERS"</span>, <span class='kw'>p_attribute</span> <span class='kw'>=</span> <span class='st'>"word"</span>,
<span class='kw'>id</span> <span class='kw'>=</span> <span class='no'>ids</span>
)</div></pre>
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