<html lang="en"> <head> <title>Application-defined Data - GNU Octave</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="GNU Octave"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Advanced-Plotting.html#Advanced-Plotting" title="Advanced Plotting"> <link rel="prev" href="Callbacks.html#Callbacks" title="Callbacks"> <link rel="next" href="Object-Groups.html#Object-Groups" title="Object Groups"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Application-defined-Data"></a> <a name="Application_002ddefined-Data"></a> <p> Next: <a rel="next" accesskey="n" href="Object-Groups.html#Object-Groups">Object Groups</a>, Previous: <a rel="previous" accesskey="p" href="Callbacks.html#Callbacks">Callbacks</a>, Up: <a rel="up" accesskey="u" href="Advanced-Plotting.html#Advanced-Plotting">Advanced Plotting</a> <hr> </div> <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>. <!-- Texinfo @sp should work but in practice produces ugly results for HTML. --> <!-- A simple blank line produces the correct behavior. --> <!-- @sp 1 --> <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>. </p></blockquote></div> </body></html>