>ggplot2 examples</h3>
<p>It should be noted that <code><a href="../reference/cplot.html">cplot()</a></code> returns a fairly tidy data frmae, making it possible to use ggplot2 as an alternative plotting package to display the kinds of relationships of typical interest. For example, returning to our earlier example:</p>
<div class="sourceCode"><pre class="sourceCode r"><code class="sourceCode r">x1 &lt;-<span class="st"> </span><span class="kw">lm</span>(mpg <span class="op">~</span><span class="st"> </span