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[Octave-bug-tracker] [bug #57212] Matlab incompatibility in getappdata()

From: Kai Torben Ohlhus
Subject: [Octave-bug-tracker] [bug #57212] Matlab incompatibility in getappdata() when opening GUIDE-built .fig files
Date: Tue, 12 Nov 2019 04:44:12 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36

Update of bug #57212 (project octave):

                  Status:                    None => Need Info              


Follow-up Comment #5:

I see.  Indeed the example TestGUI.m is not useful.  It boils down to the lack
of knowledge, how does Matlab store appdata within a figure?  To my knowledge
this is not officially documented.

But looking at your example TestGUI.fig, which is basically a mat-file only,
it seems to be an easy fix:

Where Matlab uses the figure struct field "ApplicationData", Octave currently
uses "__appdata__" instead.

A possible fix was to search for both fields to restore the appdata in a
Matlab compatible way.

Can you try the following experiment:

edit getappdata

replace each "__appdata__" by "ApplicationData", save and run your example
code again.

Does this at least resolve this particular error?  Then I can make up a more
general solution for Octave itself.


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