js&nbsp;&nbsp;&nbsp;</tt></td><td>   starting i,j indices over which summation is 
   to occur <br>&nbsp;&nbsp;&nbsp;<span class="type">[integer]</span></td>
</tr>
</table>
</dd>
<br>
</dl>
</li>
<li>
<a name="sum_field_3d"></a>
<h4>sum_field_3d</h4>
<pre>
<b>call sum_field_3d </b>(name, data, is, js)</pre>
<dl>
<dt>
<b>DESCRIPTION</b>
</dt>
<dd>   Perform a 3 dimensional summation of named field </dd>
<br>
<br>
<dt>
<b>INPUT</b>
</dt>
<dd>
<table border="0">
<tr>
<td valign="top" align="left"><tt>name&nbsp