>Single-operand math functions</h3>

<h5>Notes</h5>
<ul>
<li>Single operand math functions are evaluated using expression templates.</li>
<li>If used on an integer vector, most of the functions below will return
the answer type as a double.</li>
</ul>

<table border cellpadding=2>
<tr align=center><th>Function</th><th>Description</th><th>Real vectors</th><th>Complex vectors</th><th>Availability</th></tr>
<tr><td>abs</td><td>Absolute value</td>     <td>Y</td>     <td>Y</td>  <td>all</td><td>     </td></tr>
<