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<h3 class="section">11.11 Organization of Functions Distributed with Octave</h3>
<p>Many of Octave's standard functions are distributed as function files.
They are loosely organized by topic, in subdirectories of
<samp><var>octave-home</var><span class="file">/lib/octave/</span><var>version</var><span class="file">/m</span></samp>, to make it easier
to find them.
<p>The following is a list of all the function file subdirectories, and the
types of functions you will find there.
<dl>
<dt><samp><span class="file">audio</span></samp><dd>Functions for playing and recording sounds.
<br><dt><samp><span class="file">control</span></samp><dd>Functions for design and simulation of automatic control systems.
<br><dt><samp><span class="file">elfun</span></samp><dd>Elementary functions.
<br><dt><samp><span class="file">finance</span></samp><dd>Functions for computing interest payments, investment values, and rates
of return.
<br><dt><samp><span class="file">general</span></samp><dd>Miscellaneous matrix manipulations, like <code>flipud</code>, <code>rot90</code>,
and <code>triu</code>, as well as other basic functions, like
<code>ismatrix</code>, <code>nargchk</code>, etc.
<br><dt><samp><span class="file">image</span></samp><dd>Image processing tools. These functions require the X Window System.
<br><dt><samp><span class="file">io</span></samp><dd>Input-output functions.
<br><dt><samp><span class="file">linear-algebra</span></samp><dd>Functions for linear algebra.
<br><dt><samp><span class="file">miscellaneous</span></samp><dd>Functions that don't really belong anywhere else.
<br><dt><samp><span class="file">optimization</span></samp><dd>Minimization of functions.
<br><dt><samp><span class="file">path</span></samp><dd>Functions to manage the directory path Octave uses to find functions.
<br><dt><samp><span class="file">pkg</span></samp><dd>Install external packages of functions in Octave.
<br><dt><samp><span class="file">plot</span></samp><dd>Functions for displaying and printing two- and three-dimensional graphs.
<br><dt><samp><span class="file">polynomial</span></samp><dd>Functions for manipulating polynomials.
<br><dt><samp><span class="file">set</span></samp><dd>Functions for creating and manipulating sets of unique values.
<br><dt><samp><span class="file">signal</span></samp><dd>Functions for signal processing applications.
<br><dt><samp><span class="file">sparse</span></samp><dd>Functions for handling sparse matrices.
<br><dt><samp><span class="file">specfun</span></samp><dd>Special functions.
<br><dt><samp><span class="file">special-matrix</span></samp><dd>Functions that create special matrix forms.
<br><dt><samp><span class="file">startup</span></samp><dd>Octave's system-wide startup file.
<br><dt><samp><span class="file">statistics</span></samp><dd>Statistical functions.
<br><dt><samp><span class="file">strings</span></samp><dd>Miscellaneous string-handling functions.
<br><dt><samp><span class="file">testfun</span></samp><dd>Perform unit tests on other functions.
<br><dt><samp><span class="file">time</span></samp><dd>Functions related to time keeping.
</dl>
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