docsrc/xlisp/xlisp-doc/reference/exp.htm


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<html><head><title>XLISP exp</title>

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<body>

<a href="../start.htm">Nyquist / XLISP 2.0</a>&nbsp; -&nbsp;
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>

<hr>

<h1>exp</h1>

<hr>

<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
  <td><nobr>Type:</nobr></td>
  <td><nobr>&nbsp;&nbsp;-&nbsp;&nbsp;</nobr></td>
  <td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
  <td><nobr>Source:</nobr></td>
  <td><nobr>&nbsp;&nbsp;-&nbsp;&nbsp;</nobr></td>
  <td width="100%"><nobr>xlmath.c</nobr></td>
</tr>
</tbody></table></p>

<h2>Syntax</h2>

<dl>
<dt>(exp <i>power</i>)</dt>
<dd><i>power</i> - floating point number/expression<br>
returns - e to the x power</dd>
</dl>

<h2>Description</h2>

<p> The 'exp' function calculates e [2.7128] raised to the specified
'power' and returns the result.</p>

<h2>Examples</h2>

<pre class="example">
(exp 0.0)   <font color="#008844">; returns 1</font>
(exp 1.0)   <font color="#008844">; returns 2.71828 - e</font>
(exp 2.0)   <font color="#008844">; returns 7.38906</font>
(exp 10.0)  <font color="#008844">; returns 22026.5</font>
(exp 0)     <font color="#008844">; error: bad integer operation</font>
</pre>

<p><b>Note:</b> 'exp' with a large 'power' like 1000.0 causes an incorrect
value to be generated, with no error. The returned value will be a very
large floating point number near the computer's limit [something like
1.79000e+308].</p>

<p>See the
<a href="../manual/xlisp-man-023.htm#exp">exp</a>
function in the <nobr>XLISP 2.0</nobr> manual.</p>

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