sfilter.html

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<html><head><title>R: Statement Filter</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<table width="100%" summary="page for sFilter {tm}"><tr><td>sFilter {tm}</td><td align="right">R Documentation</td></tr></table>
<h2>Statement Filter</h2>


<h3>Description</h3>

<p>
Filter metadata by special statements.
</p>


<h3>Usage</h3>

<pre>
sFilter(object, s, ...)
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>object</code></td>
<td>
a <code>Corpus</code> to be the filter applied to.</td></tr>
<tr valign="top"><td><code>s</code></td>
<td>
a statement of format <code>"tag1 == 'expr1' &amp; tag2 ==
      'expr2' &amp; ..."</code>.</td></tr>
<tr valign="top"><td><code>...</code></td>
<td>
arguments passed over by calling functions.</td></tr>
</table>

<h3>Details</h3>

<p>
The statement <code>s</code> models a simple query language. It consists of
an expression as passed over to a data frame for subsetting. Tags in
<code>s</code> represent metadata variables. Variables only available at
document level are shifted up to the data frame if necessary. Note
that the metadata tags for the slots <code>Author</code>, <code>DateTimeStamp</code>,
<code>Description</code>, <code>ID</code>, <code>Origin</code> and <code>Heading</code> are
<code>author</code>, <code>datetimestamp</code>, <code>description</code>,
<code>identifier</code>, <code>origin</code> and <code>heading</code>, respectively, to
avoid name conflicts.
</p>


<h3>Value</h3>

<p>
A Boolean vector to represent the subset of the <code>DMetaData</code>
(extended for shifted up variables) data frame as specified by the
statement.</p>

<h3>Author(s)</h3>

<p>
Ingo Feinerer
</p>


<h3>Examples</h3>

<pre>
## Load example dataset
data("crude")

## Statement Filter returning TRUE for document with ID 127 and heading DIAMOND ...
sFilter(crude, "identifier == '127' &amp; heading == 'DIAMOND SHAMROCK (DIA) CUTS CRUDE PRICES'")
</pre>



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