<html lang="en"> <head> <title>Sparse Matrices in Oct-Files - Untitled</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Untitled"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Oct_002dFiles.html#Oct_002dFiles" title="Oct-Files"> <link rel="prev" href="Structures-in-Oct_002dFiles.html#Structures-in-Oct_002dFiles" title="Structures in Oct-Files"> <link rel="next" href="Accessing-Global-Variables-in-Oct_002dFiles.html#Accessing-Global-Variables-in-Oct_002dFiles" title="Accessing Global Variables in Oct-Files"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Sparse-Matrices-in-Oct-Files"></a> <a name="Sparse-Matrices-in-Oct_002dFiles"></a> <p> Next: <a rel="next" accesskey="n" href="Accessing-Global-Variables-in-Oct_002dFiles.html#Accessing-Global-Variables-in-Oct_002dFiles">Accessing Global Variables in Oct-Files</a>, Previous: <a rel="previous" accesskey="p" href="Structures-in-Oct_002dFiles.html#Structures-in-Oct_002dFiles">Structures in Oct-Files</a>, Up: <a rel="up" accesskey="u" href="Oct_002dFiles.html#Oct_002dFiles">Oct-Files</a> <hr> </div> <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. <dl> <dt><code>SparseMatrix</code><dd>A double precision sparse matrix class <br><dt><code>SparseComplexMatrix</code><dd>A complex sparse matrix class <br><dt><code>SparseBoolMatrix</code><dd>A boolean sparse matrix class </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 <code>Array<T></code> class, and so users familiar with Octave's <code>Array</code> classes will be comfortable with the use of the sparse classes. <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 different nature of sparse objects, and these will be described. Firstly, although it is fundamentally possible to have N-dimensional sparse objects, the Octave sparse classes do not allow them at this time. So all operations of the sparse classes must be 2-dimensional. This means that in fact <code>SparseMatrix</code> is similar to Octave's <code>Matrix</code> class rather than its <code>NDArray</code> class. <ul class="menu"> <li><a accesskey="1" href="Array-and-Sparse-Differences.html#Array-and-Sparse-Differences">Array and Sparse Differences</a> <li><a accesskey="2" href="Creating-Sparse-Matrices-in-Oct_002dFiles.html#Creating-Sparse-Matrices-in-Oct_002dFiles">Creating Sparse Matrices in Oct-Files</a> <li><a accesskey="3" href="Using-Sparse-Matrices-in-Oct_002dFiles.html#Using-Sparse-Matrices-in-Oct_002dFiles">Using Sparse Matrices in Oct-Files</a> </ul> </body></html>