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Next: <a href="Numeric-Data-Types.html" accesskey="n" rel="next">Numeric Data Types</a>, Previous: <a href="Getting-Started.html" accesskey="p" rel="prev">Getting Started</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h2 class="chapter" id="Data-Types-1"><span>3 Data Types<a class="copiable-link" href="#Data-Types-1"> ¶</a></span></h2>
<a class="index-entry-id" id="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 class="xref" href="External-Code-Interface.html">External Code Interface</a>, for
more information about Octave’s dynamic linking capabilities.
<a class="ref" href="User_002ddefined-Data-Types.html">User-defined Data Types</a> describes what you must do to define a
new data type for Octave.
</p>
<a class="anchor" id="XREFtypeinfo"></a><span style="display:block; margin-top:-4.5ex;"> </span>
<dl class="first-deftypefn">
<dt class="deftypefn" id="index-typeinfo"><span><code class="def-type"><var class="var">typestr</var> =</code> <strong class="def-name">typeinfo</strong> <code class="def-code-arguments">(<var class="var">expr</var>)</code><a class="copiable-link" href="#index-typeinfo"> ¶</a></span></dt>
<dt class="deftypefnx def-cmd-deftypefn" id="index-typeinfo-1"><span><code class="def-type"><var class="var">cstr</var> =</code> <strong class="def-name">typeinfo</strong> <code class="def-code-arguments">()</code><a class="copiable-link" href="#index-typeinfo-1"> ¶</a></span></dt>
<dd>
<p>Return the type of the expression <var class="var">expr</var>, as a string.
</p>
<p>If <var class="var">expr</var> is omitted, return a cell array of strings containing all the
currently installed data types.
</p>
<p><strong class="strong">See also:</strong> <a class="ref" href="Built_002din-Data-Types.html#XREFclass">class</a>, <a class="ref" href="Built_002din-Data-Types.html#XREFisa">isa</a>.
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