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Many of Octave’s standard functions are distributed as function files.
They are loosely organized by topic, in subdirectories of
` octave-home/lib/octave/version/m`, to make it easier
to find them.

The following is a list of all the function file subdirectories, and the types of functions you will find there.

`audio`Functions for playing and recording sounds.

`deprecated`Out-of-date functions which will eventually be removed from Octave.

`elfun`Elementary functions, principally trigonometric.

`@ftp`Class functions for the FTP object.

`general`Miscellaneous matrix manipulations, like

`flipud`

,`rot90`

, and`triu`

, as well as other basic functions, like`ismatrix`

,`narginchk`

, etc.`geometry`Functions related to Delaunay triangulation.

`help`Functions for Octave’s built-in help system.

`image`Image processing tools. These functions require the X Window System.

`io`Input-output functions.

`linear-algebra`Functions for linear algebra.

`miscellaneous`Functions that don’t really belong anywhere else.

`optimization`Functions related to minimization, optimization, and root finding.

`path`Functions to manage the directory path Octave uses to find functions.

`pkg`Package manager for installing external packages of functions in Octave.

`plot`Functions for displaying and printing two- and three-dimensional graphs.

`polynomial`Functions for manipulating polynomials.

`prefs`Functions implementing user-defined preferences.

`set`Functions for creating and manipulating sets of unique values.

`signal`Functions for signal processing applications.

`sparse`Functions for handling sparse matrices.

`specfun`Special functions such as

`bessel`

or`factor`

.`special-matrix`Functions that create special matrix forms such as Hilbert or Vandermonde matrices.

`startup`Octave’s system-wide startup file.

`statistics`Statistical functions.

`strings`Miscellaneous string-handling functions.

`testfun`Functions for performing unit tests on other functions.

`time`Functions related to time and date processing.

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