ion')</tt>
 
      <tt>second_value = U.feval(x, 'second_function', 'regions', idx)</tt>
 
 In the second call, <tt>PolyUnion/feval</tt> will only evaluate <tt>second_function</tt>
 in polyhedra specified by the <tt>indices</tt> option, hence skipping expensive
 point location.

    
	<h2>Input Arguments</h2>
<table cellspacing="0" class="body" cellpadding="4" border="0" width="100%">
<colgroup>
<col width="31%">
<col width="69%">
</colgroup>
<tbody>
<tr valign="top">
<td><tt>U</tt></td>
<td>
<p></p>Union o