rices based on whether the argument is
a single or multiple index. Examples are for a matrix <code>a</code>, with
integer single indexes <code>i</code> and <code>j</code> and integer array multiple
indexes <code>is</code> and <code>js</code>. The same typing rules apply for all multiple
indexes.</em></p>
<table>
<thead>
<tr class="header">
<th align="center">example</th>
<th align="center">row index</th>
<th align="center">column index</th>
<th align="center">result type</th>
</tr>
</thead>
<tbody>
<tr clas