match.html

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<html><head><title>R: Value Matching</title>
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<table width="100%" summary="page for match {arules}"><tr><td>match {arules}</td><td align="right">R Documentation</td></tr></table>
<h2>Value Matching</h2>


<h3>Description</h3>

<p>
Provides the generic function <code>match</code>  and the S4 methods for
associations and transactions.  <code>match</code> returns a vector of the
positions of (first) matches of its first argument in its second.
</p>
<p>
<code>%in%</code> is a more intuitive interface as a binary operator, which
returns a logical vector indicating if there is a match or not for
its left operand.
</p>


<h3>Usage</h3>

<pre>
match(x,  table, nomatch = NA_integer_, incomparables = NULL)

x %in% table
</pre>


<h3>Arguments</h3>

<table summary="R argblock">
<tr valign="top"><td><code>x</code></td>
<td>
an object of class <code>itemMatrix</code>, <code>transactions</code> or 
<code>associations</code>.</td></tr>
<tr valign="top"><td><code>table</code></td>
<td>
a set of associations or transactions to be matched against. </td></tr>
<tr valign="top"><td><code>nomatch</code></td>
<td>
the value to be returned in the case when no match is found. </td></tr>
<tr valign="top"><td><code>incomparables</code></td>
<td>
not implemented. </td></tr>
</table>

<h3>Value</h3>

<p>
<code>match</code>: An integer vector of the same length as <code>x</code>  giving the
position in <code>table</code> of the first match if there is a match, otherwise
<code>nomatch</code>.
<br>
<code>%in%</code>:  A logical vector, indicating if a match was located for each
element of <code>x</code>.</p>

<h3>See Also</h3>

<p>
<code><a href="rules-class.html">rules-class</a></code>,
<code><a href="itemsets-class.html">itemsets-class</a></code>,
<code><a href="itemMatrix-class.html">itemMatrix-class</a></code>
</p>


<h3>Examples</h3>

<pre>
data("Adult")

## get unique transactions, count frequency of unique transactions 
## and plot frequency of unique transactions
vals &lt;- unique(Adult)
cnts &lt;- tabulate(match(Adult, vals))
plot(sort(cnts, decreasing=TRUE))

## find all transactions which are equal to transaction 10 in Adult
which(Adult %in% Adult[10])
</pre>



<hr><div align="center">[Package <em>arules</em> version 0.6-6 <a href="00Index.html">Index]</a></div>

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