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
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 The GSL Team.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections and no cover texts. A copy of the license is
included in the section entitled "GNU Free Documentation License". -->
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
<head>
<title>GNU Scientific Library – Reference Manual: Initializing matrix elements</title>
<meta name="description" content="GNU Scientific Library – Reference Manual: Initializing matrix elements">
<meta name="keywords" content="GNU Scientific Library – Reference Manual: Initializing matrix elements">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Function-Index.html#Function-Index" rel="index" title="Function Index">
<link href="Matrices.html#Matrices" rel="up" title="Matrices">
<link href="Reading-and-writing-matrices.html#Reading-and-writing-matrices" rel="next" title="Reading and writing matrices">
<link href="Accessing-matrix-elements.html#Accessing-matrix-elements" rel="previous" title="Accessing matrix elements">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
div.smalllisp {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}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
-->
</style>
</head>
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Initializing-matrix-elements"></a>
<div class="header">
<p>
Next: <a href="Reading-and-writing-matrices.html#Reading-and-writing-matrices" accesskey="n" rel="next">Reading and writing matrices</a>, Previous: <a href="Accessing-matrix-elements.html#Accessing-matrix-elements" accesskey="p" rel="previous">Accessing matrix elements</a>, Up: <a href="Matrices.html#Matrices" accesskey="u" rel="up">Matrices</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Initializing-matrix-elements-1"></a>
<h4 class="subsection">8.4.3 Initializing matrix elements</h4>
<a name="index-matrices_002c-initializing"></a>
<a name="index-initializing-matrices"></a>
<a name="index-identity-matrix"></a>
<a name="index-matrix_002c-identity"></a>
<a name="index-zero-matrix"></a>
<a name="index-matrix_002c-zero"></a>
<a name="index-constant-matrix"></a>
<a name="index-matrix_002c-constant"></a>
<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fall"></a>Function: <em>void</em> <strong>gsl_matrix_set_all</strong> <em>(gsl_matrix * <var>m</var>, double <var>x</var>)</em></dt>
<dd><p>This function sets all the elements of the matrix <var>m</var> to the value
<var>x</var>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fzero"></a>Function: <em>void</em> <strong>gsl_matrix_set_zero</strong> <em>(gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function sets all the elements of the matrix <var>m</var> to zero.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fidentity"></a>Function: <em>void</em> <strong>gsl_matrix_set_identity</strong> <em>(gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function sets the elements of the matrix <var>m</var> to the
corresponding elements of the identity matrix, <em>m(i,j) =
\delta(i,j)</em>, i.e. a unit diagonal with all off-diagonal elements zero.
This applies to both square and rectangular matrices.
</p></dd></dl>
</body>
</html>
|
