et_grid.html">gf_facet_grid()</a></code> that is terser and may feel more familiar to users
of <span class="pkg">lattice</span>.</p>
    </div>
    <div id="evaluation">
    <h2>Evaluation</h2>



<p>Evaluation of the <span class="pkg">ggplot2</span> code occurs in the environment of <code>gformula</code>.
This will typically do the right thing when formulas are created on the fly, but might not
be the right thing if formulas created in one environment are used to create plots
in another.</p>
    </div>
   