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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>
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<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>
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<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">
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<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">
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