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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>
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<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>
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<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">
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