GUI + Reference to non-existent field 'axes1'.

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mehdi
mehdi il 31 Ott 2014
Commentato: Geoff Hayes il 31 Ott 2014
hi all.
I'm working on a project, where i load data ind by "importdata". I want to plot some funktion from these data.
I have created a funktion that open a direction and select a file from this.
this funkion is created like this:
function handles = RoboTrainer( handles )
[filename, pathname] = ...
uigetfile({'*dat'},'File Selector');
[Time,Position,Velocity,RoboForce,AppliedForce,Repetition] =... importfile(fullfile(pathname, filename));
%% GUI variables
handles.MyData.Time = Time;
handles.MyData.Position = Position;
handles.MyData.Velocity = Velocity;
handles.MyData.RoboForce = RoboForce;
handles.MyData.AppliedForce = AppliedForce;
handles.MyData.Repetition = Repetition;
end
I have another function that has to plot a funktion from Time and Position.
function handles = TimePosition( handles )
Sample = length( handles.MyData.Time );
tid=linspace(0,(Sample*0.05),Sample);
axes(handles.axes1);
plot(tid,handles.MyData.Position);
ylabel ('position'); xlabel ('tid/sek'); title ('Position');
end
In my GUI i have created a axes (named axes1).
function axes1_CreateFcn(hObject, eventdata, handles)
handles = RoboTrainer( handles );
guidata(hObject, handles);
handles = TimePosition( handles );
guidata(hObject, handles);
but when i run my GUI, i got this error: "Reference to non-existent field 'axes1'." i don know what I make wrongly?
is there anyone to help me please?
i did not know how to explain the problem without explain all my code :(.

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Geoff Hayes
Geoff Hayes il 31 Ott 2014
Mehdi - put a breakpoint at the first line of your axes1_CreateFcn function, then re-run your GUI. When the debugger pauses at this line, look at handles structure - it is probably an empty object and so the error message makes sense (I reproduced this with a simple GUI).
If you want to populate your axes in this manner (calling the RoboTrainer and TimePosition functions), I would just put this code in the OpeningFcn of your GUI when the handles structure has all of its widget/control (i.e. axes1) fields defined. Something like
function MyGui_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles = RoboTrainer(handles);
handles = TimePosition(handles);
guidata(hObject, handles);
Try the above and see what happens!
  2 Commenti
mehdi
mehdi il 31 Ott 2014
thank you very much sir.
it works now! :)
I always thought that i call funktions in my axes_callback.
I have forgotten about OpeningFcn function.
Geoff Hayes
Geoff Hayes il 31 Ott 2014
Glad that it works!

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