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<html><head>
<title>cl:log</title>
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<a href="../../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../../manual/contents.htm">Contents</a> |
<a href="../../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples.htm">Examples</a> |
<a href="../../reference/reference-index.htm">Reference</a>
<hr>
<h1>cl:log</h1>
<hr>
<p>The <nobr>cl:<b>log</b></nobr> function does the same as the
Nyquist/XLISP <a href="../../reference/log.htm">log</a> function, but also
accepts integer numbers and has an optional 'base' argument:</p>
<p><div class="box">
<dl>
<dt>(cl:<b>log</b> <i>number</i> [<i>base</i>])</dt>
<dd><i>number</i> - an integer or floating-point number<br>
<i>base</i> - an integer or floating-point number<br>
returns - the the logarithm of <i>number</i> in base <i>base</i></dd>
</dl>
</div></p>
<pre class="example">
(defun <font color="#0000CC">cl:log</font> (number &optional base)
(if base
(if (zerop base)
0.0
(/ (log (float number)) (log (float base))))
(log (float number))))
</pre>
<p>The '<nobr>cl:log</nobr>' function returns the logarithm of 'number' in
base 'base'. <nobr>If 'base'</nobr> is not supplied its value <nobr>is
'e'</nobr>, the base of the natural logarithms. <nobr>If the</nobr> 'base'
argument is zero, then 'cl:log' returns zero. <nobr>The result</nobr> is
always a <nobr>floating-point</nobr> number.</p>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
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