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<title>Application-defined Data - GNU Octave</title>
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<a name="Application-defined-Data"></a>
<a name="Application_002ddefined-Data"></a>
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<h4 class="subsection">15.4.5 Application-defined Data</h4>
<p><a name="index-application_002ddefined-data-1552"></a>
Octave has a provision for attaching application-defined data to a graphics
handle. The data can be anything which is meaningful to the application, and
will be completely ignored by Octave.
<!-- setappdata scripts/miscellaneous/setappdata.m -->
<p><a name="doc_002dsetappdata"></a>
<div class="defun">
— Function File: <b>setappdata</b> (<var>h, name, value</var>)<var><a name="index-setappdata-1553"></a></var><br>
<blockquote><p>Set the named application data to <var>value</var> for the object(s) with
handle(s) <var>h</var>. If the application data with the specified name does
not exist, it is created.
</p></blockquote></div>
<!-- getappdata scripts/miscellaneous/getappdata.m -->
<p><a name="doc_002dgetappdata"></a>
<div class="defun">
— Function File: <var>value</var> = <b>getappdata</b> (<var>h, name</var>)<var><a name="index-getappdata-1554"></a></var><br>
<blockquote><p>Return the <var>value</var> for named application data for the object(s) with
handle(s) <var>h</var>.
— Function File: <var>appdata</var> = <b>getappdata</b> (<var>h</var>)<var><a name="index-getappdata-1555"></a></var><br>
<blockquote><p>Return a structure, <var>appdata</var>, whose fields correspond to the appdata
properties.
</p></blockquote></div>
<!-- rmappdata scripts/miscellaneous/rmappdata.m -->
<p><a name="doc_002drmappdata"></a>
<div class="defun">
— Function File: <b>rmappdata</b> (<var>h, name</var>)<var><a name="index-rmappdata-1556"></a></var><br>
<blockquote><p>Delete the named application data for the object(s) with
handle(s) <var>h</var>.
</p></blockquote></div>
<!-- isappdata scripts/miscellaneous/isappdata.m -->
<p><a name="doc_002disappdata"></a>
<div class="defun">
— Function File: <var>V</var> = <b>isappdata</b> (<var>h, name</var>)<var><a name="index-isappdata-1557"></a></var><br>
<blockquote><p>Return true if the named application data, <var>name</var>, exists for the
object with handle <var>h</var>.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dgetappdata.html#doc_002dgetappdata">getappdata</a>, <a href="doc_002dsetappdata.html#doc_002dsetappdata">setappdata</a>, <a href="doc_002drmappdata.html#doc_002drmappdata">rmappdata</a>.
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