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## 11.11 Organization of Functions Distributed with Octave

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.

- ‘
`control`’ Functions for design and simulation of automatic control systems.

- ‘
`elfun`’ Elementary functions.

- ‘
`finance`’ Functions for computing interest payments, investment values, and rates of return.

- ‘
`general`’ Miscellaneous matrix manipulations, like

`flipud`

,`rot90`

, and`triu`

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

,`nargchk`

, etc.- ‘
`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`’ Minimization of functions.

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

- ‘
`pkg`’ Install external packages of functions in Octave.

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

- ‘
`polynomial`’ Functions for manipulating polynomials.

- ‘
`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.

- ‘
`special-matrix`’ Functions that create special matrix forms.

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

- ‘
`statistics`’ Statistical functions.

- ‘
`strings`’ Miscellaneous string-handling functions.

- ‘
`testfun`’ Perform unit tests on other functions.

- ‘
`time`’ Functions related to time keeping.

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