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<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> -
<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> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </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) => 0
(atan 1.0) => 0.785398
(atan -1.0) => -0.785398
(atan 0) => 0
</pre>
<p>See also:</p>
<ul>
<li><nobr>Contents → <a href="../manual/contents.htm#arithmetic-functions">Arithmetic Functions</a></nobr></li>
</ul>
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<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
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<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
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