1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>FreeMat: NAN Not-a-Number Constant</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">FreeMat
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.1.1 -->
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li class="current"><a href="pages.html"><span>Related Pages</span></a></li>
</ul>
</div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('array_nan.html','');});
</script>
<div id="doc-content">
<div class="header">
<div class="headertitle">
<div class="title">NAN Not-a-Number Constant </div> </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><p>Section: <a class="el" href="sec_array.html">Array Generation and Manipulations</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>Returns a value that represents ``not-a-number'' for both 32 and 64-bit floating point values. This constant is meant to represent the result of arithmetic operations whose output cannot be meaningfully defined (like zero divided by zero). There are several forms for the <code>NaN</code> function. The first form returns a double precision <code>NaN</code>. </p>
<pre class="fragment"> y = nan
</pre><p> The next form takes a class name that can be either <code>'double'</code> </p>
<pre class="fragment"> y = nan('double')
</pre><p> or <code>'single'</code>: </p>
<pre class="fragment"> y = nan('single')
</pre><p> With a single parameter it generates a square matrix of <code>nan</code>s. </p>
<pre class="fragment"> y = nan(n)
</pre><p> Alternatively, you can specify the dimensions of the array via </p>
<pre class="fragment"> y = nan(m,n,p,...)
</pre><p> or </p>
<pre class="fragment"> y = nan([m,n,p,...])
</pre><p> Finally, you can add a classname of either <code>'single'</code> or <code>'double'</code>. </p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>The following examples demonstrate a few calculations with the not-a-number constant.</p>
<pre class="fragment">--> nan*0
ans =
NaN
--> nan-nan
ans =
NaN
</pre><p>Note that <code>NaN</code>s are preserved under type conversion to floating point types (i.e., <code>float</code>, <code>double</code>, <code>complex</code> and <code>dcomplex</code> types), but not integer types.</p>
<pre class="fragment">--> uint32(nan)
ans =
0
--> complex(nan)
ans =
NaN
</pre> </div></div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="navelem"><a class="el" href="index.html">FreeMat Documentation</a></li><li class="navelem"><a class="el" href="sec_array.html">Array Generation and Manipulations</a></li>
<li class="footer">Generated on Thu Jul 25 2013 18:58:11 for FreeMat by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.1.1 </li>
</ul>
</div>
</body>
</html>
|
