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<h2 class="chapter">3 Data Types</h2>
<p><a name="index-data-types-171"></a>
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>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="Dynamically-Linked-Functions.html#Dynamically-Linked-Functions">Dynamically Linked Functions</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.
<!-- ov-typeinfo.cc -->
<p><a name="doc_002dtypeinfo"></a>
<div class="defun">
— Built-in Function: <b>typeinfo</b> (<var>expr</var>)<var><a name="index-typeinfo-172"></a></var><br>
<blockquote>
<p>Return the type of the expression <var>expr</var>, as a string. If
<var>expr</var> is omitted, return an array of strings containing all the
currently installed data types.
</p></blockquote></div>
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<li><a accesskey="2" href="User_002ddefined-Data-Types.html#User_002ddefined-Data-Types">User-defined Data Types</a>
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