a[i, js]</code></td>
<td align="center">single</td>
<td align="center">multiple</td>
<td align="center">row vector</td>
</tr>
<tr class="odd">
<td align="center"><code>a[is, j]</code></td>
<td align="center">multiple</td>
<td align="center">single</td>
<td align="center">vector</td>
</tr>
<tr class="even">
<td align="center"><code>a[is, js]</code></td>
<td align="center">multiple</td>
<td align="center">multiple</td>
<td align="center">matrix</td>
</tr>
</tbody>
</table>
<p>Evaluation of matrices with multi