1 files changed, 77 insertions, 0 deletions
diff --git a/docsrc/xlisp/xlisp-doc/reference/atan.htm b/docsrc/xlisp/xlisp-doc/reference/atan.htm
new file mode 100644
index 0000000..27d67b5
--- /dev/null
+++ b/docsrc/xlisp/xlisp-doc/reference/atan.htm
@@ -0,0 +1,77 @@
+<html><head><title>XLISP atan</title>
+
+<link rel="stylesheet" type="text/css" href="reference.css">
+
+</head>
+
+<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>atan</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>
+
+<p><div class="box">
+
+<dl>
+<dt>(<b>atan</b> <i>expr</i> [<i>expr2</i>])</dt>
+<dd><i>expr</i> - an integer or floating point expression<br>
+<i>expr2</i> - an optional divisor [default value <nobr>is 1.0]</nobr><br>
+returns - the arctangent of the division of <i>expr</i> and <i>expr2</i></dd>
+</dl>
+
+</div></p>
+
+<h2>Description</h2>
+
+<p>The 'atan' function returns the arc tangent of the division of 'expr' and
+'expr2'. <nobr>The result</nobr> is in radians.</p>
+
+<h2>Examples</h2>
+
+<pre class="example">
+(atan  0.0)  =&gt;  0
+(atan  1.0)  =&gt;  0.785398
+(atan -1.0)  =&gt; -0.785398
+(atan    0)  =&gt;  0
+</pre>
+
+<p>See also:</p>
+
+<ul>
+<li><nobr>Contents &rarr; <a href="../manual/contents.htm#arithmetic-functions">Arithmetic Functions</a></nobr></li>
+</ul>
+
+<p><nobr>&nbsp;&nbsp;<a href="#top">Back to Top</nobr></a></p>
+
+<hr>
+
+<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>
+
+</body></html>
+\ No newline at end of file