<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Data Types (GNU Octave (version 5.1.0))</title> <meta name="description" content="Data Types (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Data Types (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="index.html#Top" rel="up" title="Top"> <link href="Built_002din-Data-Types.html#Built_002din-Data-Types" rel="next" title="Built-in Data Types"> <link href="Comments-and-the-Help-System.html#Comments-and-the-Help-System" rel="prev" title="Comments and the Help System"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> <link rel="stylesheet" type="text/css" href="octave.css"> </head> <body lang="en"> <a name="Data-Types"></a> <div class="header"> <p> Next: <a href="Numeric-Data-Types.html#Numeric-Data-Types" accesskey="n" rel="next">Numeric Data Types</a>, Previous: <a href="Getting-Started.html#Getting-Started" accesskey="p" rel="prev">Getting Started</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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> </div> <hr> <a name="Data-Types-1"></a> <h2 class="chapter">3 Data Types</h2> <a name="index-data-types"></a> <p>All versions of Octave include a number of built-in data types, including real and complex scalars and matrices, character strings, a data structure type, and an array that can contain all data types. </p> <p>It is also possible to define new specialized data types by writing a small amount of C++ code. On some systems, new data types can be loaded dynamically while Octave is running, so it is not necessary to recompile all of Octave just to add a new type. See <a href="External-Code-Interface.html#External-Code-Interface">External Code Interface</a>, for more information about Octave’s dynamic linking capabilities. <a href="User_002ddefined-Data-Types.html#User_002ddefined-Data-Types">User-defined Data Types</a> describes what you must do to define a new data type for Octave. </p> <a name="XREFtypeinfo"></a><dl> <dt><a name="index-typeinfo"></a><em></em> <strong>typeinfo</strong> <em>()</em></dt> <dt><a name="index-typeinfo-1"></a><em></em> <strong>typeinfo</strong> <em>(<var>expr</var>)</em></dt> <dd> <p>Return the type of the expression <var>expr</var>, as a string. </p> <p>If <var>expr</var> is omitted, return a cell array of strings containing all the currently installed data types. </p> <p><strong>See also:</strong> <a href="Built_002din-Data-Types.html#XREFclass">class</a>, <a href="Built_002din-Data-Types.html#XREFisa">isa</a>. </p></dd></dl> <table class="menu" border="0" cellspacing="0"> <tr><td align="left" valign="top">• <a href="Built_002din-Data-Types.html#Built_002din-Data-Types" accesskey="1">Built-in Data Types</a>:</td><td> </td><td align="left" valign="top"> </td></tr> <tr><td align="left" valign="top">• <a href="User_002ddefined-Data-Types.html#User_002ddefined-Data-Types" accesskey="2">User-defined Data Types</a>:</td><td> </td><td align="left" valign="top"> </td></tr> <tr><td align="left" valign="top">• <a href="Object-Sizes.html#Object-Sizes" accesskey="3">Object Sizes</a>:</td><td> </td><td align="left" valign="top"> </td></tr> </table> </body> </html>