File: Processing-Data-in-Structures.html

package info (click to toggle)
octave 6.2.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 124,192 kB
  • sloc: cpp: 322,665; ansic: 68,088; fortran: 20,980; objc: 8,121; sh: 7,719; yacc: 4,266; lex: 4,123; perl: 1,530; java: 1,366; awk: 1,257; makefile: 424; xml: 147
file content (117 lines) | stat: -rw-r--r-- 4,542 bytes parent folder | download 
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
110
111
112
113
114
115
116
117
 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Processing Data in Structures (GNU Octave (version 6.2.0))</title>

<meta name="description" content="Processing Data in Structures (GNU Octave (version 6.2.0))">
<meta name="keywords" content="Processing Data in Structures (GNU Octave (version 6.2.0))">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html" rel="start" title="Top">
<link href="Concept-Index.html" rel="index" title="Concept Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Structures.html" rel="up" title="Structures">
<link href="containers_002eMap.html" rel="next" title="containers.Map">
<link href="Manipulating-Structures.html" rel="prev" title="Manipulating Structures">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>
<link rel="stylesheet" type="text/css" href="octave.css">


</head>

<body lang="en">
<span id="Processing-Data-in-Structures"></span><div class="header">
<p>
Previous: <a href="Manipulating-Structures.html" accesskey="p" rel="prev">Manipulating Structures</a>, Up: <a href="Structures.html" accesskey="u" rel="up">Structures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Processing-Data-in-Structures-1"></span><h4 class="subsection">6.1.5 Processing Data in Structures</h4>

<p>The simplest way to process data in a structure is within a <code>for</code>
loop (see <a href="Looping-Over-Structure-Elements.html">Looping Over Structure Elements</a>).  A similar effect can be
achieved with the <code>structfun</code> function, where a user defined
function is applied to each field of the structure.
See <a href="Function-Application.html#XREFstructfun">structfun</a>.
</p>
<p>Alternatively, to process the data in a structure, the structure might
be converted to another type of container before being treated.
</p>
<span id="XREFstruct2cell"></span><dl>
<dt id="index-struct2cell">: <em><var>c</var> =</em> <strong>struct2cell</strong> <em>(<var>s</var>)</em></dt>
<dd><p>Create a new cell array from the objects stored in the struct object.
</p>
<p>If <var>f</var> is the number of fields in the structure, the resulting cell
array will have a dimension vector corresponding to
<code>[<var>f</var> size(<var>s</var>)]</code>.  For example:
</p>
<div class="example">
<pre class="example">s = struct (&quot;name&quot;, {&quot;Peter&quot;, &quot;Hannah&quot;, &quot;Robert&quot;},
           &quot;age&quot;, {23, 16, 3});
c = struct2cell (s)
   &rArr; c = {2x1x3 Cell Array}
c(1,1,:)(:)
   &rArr;
      {
        [1,1] = Peter
        [2,1] = Hannah
        [3,1] = Robert
      }
c(2,1,:)(:)
   &rArr;
      {
        [1,1] = 23
        [2,1] = 16
        [3,1] = 3
      }
</pre></div>


<p><strong>See also:</strong> <a href="Processing-Data-in-Cell-Arrays.html#XREFcell2struct">cell2struct</a>, <a href="#XREFnamedargs2cell">namedargs2cell</a>, <a href="Manipulating-Structures.html#XREFfieldnames">fieldnames</a>.
</p></dd></dl>


<span id="XREFnamedargs2cell"></span><dl>
<dt id="index-namedargs2cell">: <em><var>c</var> =</em> <strong>namedargs2cell</strong> <em>(<var>s</var>)</em></dt>
<dd><p>Create a cell array of field name/value pairs from a scalar structure.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">s.Name = &quot;Peter&quot;;
s.Height = 185;
s.Age = 42;

c = namedargs2cell (s)
  &rArr; { &quot;Name&quot;, &quot;Peter&quot;, &quot;Height&quot;, 185, &quot;Age&quot;, 42 }
</pre></div>


<p><strong>See also:</strong> <a href="#XREFstruct2cell">struct2cell</a>.
</p></dd></dl>





</body>
</html>