<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Sparse Matrices in Oct-Files (GNU Octave (version 5.1.0))</title> <meta name="description" content="Sparse Matrices in Oct-Files (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Sparse Matrices in Oct-Files (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Oct_002dFiles.html#Oct_002dFiles" rel="up" title="Oct-Files"> <link href="Array-and-Sparse-Class-Differences.html#Array-and-Sparse-Class-Differences" rel="next" title="Array and Sparse Class Differences"> <link href="Structures-in-Oct_002dFiles.html#Structures-in-Oct_002dFiles" rel="prev" title="Structures in Oct-Files"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} 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.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"> <a name="Sparse-Matrices-in-Oct_002dFiles"></a> <div class="header"> <p> Next: <a href="Accessing-Global-Variables-in-Oct_002dFiles.html#Accessing-Global-Variables-in-Oct_002dFiles" accesskey="n" rel="next">Accessing Global Variables in Oct-Files</a>, Previous: <a href="Structures-in-Oct_002dFiles.html#Structures-in-Oct_002dFiles" accesskey="p" rel="prev">Structures in Oct-Files</a>, Up: <a href="Oct_002dFiles.html#Oct_002dFiles" accesskey="u" rel="up">Oct-Files</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <a name="Sparse-Matrices-in-Oct_002dFiles-1"></a> <h4 class="subsection">A.1.6 Sparse Matrices in Oct-Files</h4> <p>There are three classes of sparse objects that are of interest to the user. </p> <dl compact="compact"> <dt><code>SparseMatrix</code></dt> <dd><p>A double precision sparse matrix class </p> </dd> <dt><code>SparseComplexMatrix</code></dt> <dd><p>A complex sparse matrix class </p> </dd> <dt><code>SparseBoolMatrix</code></dt> <dd><p>A boolean sparse matrix class </p></dd> </dl> <p>All of these classes inherit from the <code>Sparse<T></code> template class, and so all have similar capabilities and usage. The <code>Sparse<T></code> class was based on Octave’s <code>Array<T></code> class and users familiar with Octave’s <code>Array</code> classes will be comfortable with the use of the sparse classes. </p> <p>The sparse classes will not be entirely described in this section, due to their similarity with the existing <code>Array</code> classes. However, there are a few differences due the nature of sparse objects, and these will be described. First, although it is fundamentally possible to have N-dimensional sparse objects, the Octave sparse classes do not allow them at this time; All instances of the sparse classes <strong>must</strong> be 2-dimensional. This means that <code>SparseMatrix</code> is actually more similar to Octave’s <code>Matrix</code> class than it is to the <code>NDArray</code> class. </p> <table class="menu" border="0" cellspacing="0"> <tr><td align="left" valign="top">• <a href="Array-and-Sparse-Class-Differences.html#Array-and-Sparse-Class-Differences" accesskey="1">Array and Sparse Class Differences</a>:</td><td> </td><td align="left" valign="top"> </td></tr> <tr><td align="left" valign="top">• <a href="Creating-Sparse-Matrices-in-Oct_002dFiles.html#Creating-Sparse-Matrices-in-Oct_002dFiles" accesskey="2">Creating Sparse Matrices in Oct-Files</a>:</td><td> </td><td align="left" valign="top"> </td></tr> <tr><td align="left" valign="top">• <a href="Using-Sparse-Matrices-in-Oct_002dFiles.html#Using-Sparse-Matrices-in-Oct_002dFiles" accesskey="3">Using Sparse Matrices in Oct-Files</a>:</td><td> </td><td align="left" valign="top"> </td></tr> </table> </body> </html>