ector_scalar_unary_traits&lt;E, vector_index_norm_inf&lt;typename E::value_type&gt; &gt;::result_type
    index_norm_inf (const vector_expression&lt;E&gt; &amp;e);</code>
</pre>
<h4>Description</h4>
<p><code>sum</code> computes the sum of the vector expression's
elements. <code>norm_1</code>, <code>norm_2</code> and
<code>norm_inf</code> compute the corresponding
<em>||.||</em><sub><em>1</em></sub>,
<em>||.||</em><sub><em>2</em></sub> and
<em>||.||</em><sub><em>inf</em></sub> vector norms.
<code>index_norm_