s="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for class 'grid.par'</span></span>
<span><span class="fu">interp</span><span class="op">(</span><span class="va">object</span>, <span class="va">data</span>, <span class="va">newx</span>, <span class="va">...</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># S3 method for class 'data.grid'</span></span>
<span><span class="fu">interp</span><span class="op">(</span><span class="va">ob