expression to the sub matrix. Left and right hand
side of the assignment should be independent.</td>
</tr>

<tr>
<td><code>template&lt;class AE&gt;<br>
 matrix_slice &amp;operator -= (const matrix_expression&lt;AE&gt;
&amp;ae)</code></td>
<td>A computed assignment operator. Subtracts the matrix expression
from the sub matrix.</td>
</tr>

<tr>
<td><code>template&lt;class AE&gt;<br>
 matrix_slice &amp;minus_assign (const matrix_expression&lt;AE&gt;
&amp;ae)</code></td>
<td>Subtracts a matrix expression from t