ator1 begin1 () const</code></td>
<td>Returns a <code>const_iterator1</code> pointing to the
beginning of the <code>matrix_range</code>.</td>
</tr>

<tr>
<td><code>const_iterator1 end1 () const</code></td>
<td>Returns a <code>const_iterator1</code> pointing to the end of
the <code>matrix_range</code>.</td>
</tr>

<tr>
<td><code>iterator1 begin1 ()</code> </td>
<td>Returns a <code>iterator1</code> pointing to the beginning of
the <code>matrix_range</code>.</td>
</tr>

<tr>
<td><code>iterator1 end1 ()</code> 